@conference {441, title = {Anisotropic Terahertz Microscopy of Lysozyme in Different CrystalLattice Systems}, booktitle = {Biophysical Journal}, year = {2021}, month = {02/2021}, abstract = {

Long-range vibrational modes of proteins at terahertz (THz) frequencies havebeen associated with protein function and allosteric control. The characteriza-tion of these motions has been challenging due to energy overlap with waterabsorption and a large vibrational density of states. Recently it has been demon-strated both experimentally and theoretically that vibrational bands can be iso-lated using stationary sample anisotropic terahertz microscopy (SSTAM) fororiented samples, typically realized using protein crystals [1, 2]. In those earlymeasurements, inhibitor binding contrast was demonstrated for high symmetrytetragonal crystals. While high symmetry crystals are ideal for structural deter-minations, they can limit the types of vibrations observable in the ATM mea-surements. Here we show a survey of ATM measurements of triclinic,monoclinic and tetragonal crystals, demonstrating the unique signaturesobservable for the different symmetry groups, leading to a more completedetermination of the vibrational hot spots that may contribute to enzymatic ef-ficiency. The SSATM spectra indicate the presence of conserved vibrationalmodes near 40 cm-1 and 55 cm-1 for CEWL in triclinic, monoclinic and tetrag-onal lattice systems respectively. For CEWL in the monoclinic lattice system, aprominent band at 20cm1was consistently observed in the SSATM spectrabut not in the triclinic or tetragonal systems. The conserved bands may repre-sent vibrational modes that are unperturbed by crystal contact forces while thedifferences may be related to unique molecular orientation in different crystalsystems.


1.Niessen, K., Y. Deng, and A.G. Markelz,Near-field THz micropo-larimetry.Opt Express, 2019.27(20): p. 28036-28047.

2.Romo, T.D., A.Grossfield, and A.G. MarkelzPersistent Protein Motions in a RuggedEnergy Landscape Revealed by Normal Mode Ensemble Analysis. AcceptedJournal of Chemical Information and Modeling, 2020.

}, doi = {10.1016/j.bpj.2020.11.972}, url = {https://www.cell.com/biophysj/fulltext/S0006-3495(20)31879-8}, author = {McKinney, J. A. and George, D. K. and Deng, Y. and Markelz, A. G.} } @article {545, title = {Functional-State Dependence of Picosecond Protein Dynamics}, journal = {J. Phys. Chem. B}, volume = {125}, year = {2021}, pages = {11134-11140}, chapter = {11134}, abstract = {

We examine temperature-dependent picosecond dynamics of two benchmarking proteins lysozyme and cytochrome c using temperature-dependent terahertz permittivity measurements. We find that a double Arrhenius temperature dependence with activation energies E1 \~{} 0.1 kJ/mol and E2 \~{} 10 kJ/mol fits the folded and ligand-free state response. The higher activation energy is consistent with the so-called protein dynamical transition associated with beta relaxations at the solvent{\textendash}protein interface. The lower activation energy is consistent with correlated structural motions. When the structure is removed by denaturing, the lower-activation-energy process is no longer present. Additionally, the lower-activation-energy process is diminished with ligand binding but not for changes in the internal oxidation state. We suggest that the lower-energy activation process is associated with collective structural motions that are no longer accessible with denaturing or binding.

}, doi = {10.1021/acs.jpcb.1c05018}, author = {George, D. K. and Chen, J. Y. and He, Yunfen and Knab, J. R. and Markelz, A. G.} } @article {329, title = {Near-Field Stationary Sample Terahertz Spectroscopic Polarimetry for Biomolecular Structural Dynamics Determination}, journal = {ACS Photonics}, volume = {8}, year = {2021}, month = {02/2021}, pages = {658-668}, chapter = {658}, abstract = {

THz polarimetry on environmentally sensitive and microscopic samples can provide unique insight into underlying mechanisms of complex phenomena. For example, near-field THz anisotropic absorption successfully isolated protein structural vibrations which are connected to biological function. However, to determine how these vibrations impact function requires high throughput measurements of these complex systems, which is challenged by the need for near field detection, sample environmental control and full polarization variation. Stationary sample anisotropic terahertz spectroscopy (SSATS) and near-field stationary sample anisotropic terahertz microscopy (SSATM) have been proposed using synchronous control of THz and electro optic probe polarizations along an iso-response curve. Here we realize these techniques through robust control and calibration of the THz and NIR polarization states. Both methods rapidly measure the linear dichroism in the far field and near field. Validation measurements using standard birefringent sucrose single crystals found the crystal orientation can be determined by scanning the reference polarization and the synchronous pump{\textendash}probe polarization settings can be optimized to eliminate artifacts. SSATM is then used to determine spectral reproducibility and dehydration effects for a series of chicken egg white lysozyme samples. Reproducible anisotropic absorbance bands are found at about 30, 44, 55, and 62 cm{\textendash}1. These bands initially sharpen with slow dehydration, similar to the increase in resolution achieved in X-ray crystallographic protein structure determination. The SSATM technique confirms the reliability of anisotropic absorption characterization of protein intramolecular vibrations and opens an avenue for rapid determination of how these long-range dynamics affect biological function.

}, doi = {10.1021/acsphotonics.0c01876}, url = {https://pubs.acs.org/doi/abs/10.1021/acsphotonics.0c01876}, author = {Deng, Y. and McKinney, J. A. and George, D. K. and Niessen, K. A. and Sharma, A. and Markelz, A.G.} } @article {253, title = {Evidence of Intramolecular Structural Stabilization in Light Activated State of Orange Carotenoid Protein}, journal = {Biophysical Journal}, volume = {118}, number = {3}, year = {2020}, note = {ISI Document Delivery No.: KK8YX
Times Cited: 0
Cited Reference Count: 0
McKinney, Jeffrey A. Sharma, Akansha Crossen, Kimberly Deng, Yanting George, Deepu K. Lechno-Yossef, Sigal Kerfeld, Cheryl Markelz, Andrea G.
64th Annual Meeting of the Biophysical-Society
Feb 15-19, 2020
San Diego, CA
Biophys Soc
NSFNational Science Foundation (NSF) [DBI 1556359, MCB 1616529]; DOEUnited States Department of Energy (DOE) [DE-SC0016317]; NIH STTRUnited States Department of Health \& Human ServicesNational Institutes of Health (NIH) - USA [R41 GM125486]
This work is supported by NSF grants DBI 1556359 and MCB 1616529, DOE grant DE-SC0016317 and NIH STTR R41 GM125486.

1
2
Cell press
Cambridge
1542-0086}, month = {Feb}, pages = {208A-208A}, type = {Meeting Abstract}, abstract = {

Orange carotenoid protein (OCP) controls efficiency of the light harvesting antenna, the phycobilisome (PBS), in diverse cyanobacteria and prevents oxidative damage. It is the only known photoactive protein that uses a carotenoid, canthaxanthin, as its chromophore. The structure of OCP consists of two globular domains, connected by an unstructured loop, that forms a hydrophobic pocket for the carotenoid. In low light, canthaxanthin bound OCP is inactive and appears orange. Illumination by strong light results in an active state that interacts with the PBS to induce fluorescence quenching, a red appearance and conformational changes that include a 12{\r A} shift by canthaxanthin into the N-terminal domain. Terahertz (THz) dynamical transition measurements and anisotropic terahertz microscopy are used to measure the intramolecular structural dynamics in the inactive and active states, which can be induced by photoexcitation or chaotropic salts. The measurements indicate that the active state has a decrease in structural flexibility, which may be related to enhanced interactions with the PBS.

}, keywords = {Biophysics}, isbn = {0006-3495}, doi = {10.1016/j.bpj.2019.11.1245}, author = {McKinney, J. A. and Sharma, A. and Crossen, K. and Deng, Y. and George, D. K. and Lechno-Yossef, S. and Kerfeld, C. and Markelz, A. G.} } @article {238, title = {Linear dichroism infrared resonance in overdoped, underdoped, and optimally doped cuprate superconductors}, journal = {Physical Review B}, volume = {102}, number = {5}, year = {2020}, note = {ISI Document Delivery No.: NE5GO
Times Cited: 0
Cited Reference Count: 30
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George DK, 2012, J OPT SOC AM B, V29, P1406, DOI 10.1364/JOSAB.29.001406
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Yakovenko VM, 2015, PHYSICA B, V460, P159, DOI 10.1016/j.physb.2014.11.060
Zhang H, 2018, PHYS REV MATER, V2, DOI 10.1103/PhysRevMaterials.2.033803
Zhang J, 2018, SCI ADV, V4, DOI 10.1126/sciadv.aao5235
Zhao L, 2017, NAT PHYS, V13, P250, DOI [10.1038/nphys3962, 10.1038/NPHYS3962]
Zhao L., 2018, ENCY MODERN OPTICS, P207
Mukherjee, A. Seo, J. Arik, M. M. Zhang, H. Zhang, C. C. Kirzhner, T. George, D. K. Markelz, A. G. Armitage, N. P. Koren, G. Wei, J. Y. T. Cerne, J.
NSF-DMR GrantNational Science Foundation (NSF) [1410599]; NSFNational Science Foundation (NSF) [MCB 1616529, DMR 1905519]; DOEUnited States Department of Energy (DOE) [DE-SC0016317]; NSERCNatural Sciences and Engineering Research Council of Canada (NSERC); CFI-OITCanada Foundation for Innovation; Canadian Institute for Advanced ResearchCanadian Institute for Advanced Research (CIFAR)
We are indebted to D. Hsieh, S. A. Kivelson, C. M. Varma, and L. Zhao for helpful discussions. We gratefully acknowledge support from NSF-DMR Grant No. 1410599 (J.C.). A.G.M. and D.K.G. were supported by NSF Grant No. MCB 1616529 and DOE Grant No. DE-SC0016317. Work in Toronto was supported by NSERC, CFI-OIT, and the Canadian Institute for Advanced Research. J.Y.T.W. thanks Kejun Xu for laboratory assistance in Toronto. N.P.A. was supported by NSF Grant No. DMR 1905519.

9
Amer physical soc
College pk
2469-9969}, month = {Aug}, pages = {6}, type = {Article}, abstract = {

By measuring the polarization changes in terahertz, infrared, and visible radiation over an extended energy range (3-2330 meV), we observe symmetry breaking in cuprate high-temperature superconductors over wide energy, doping, and temperature ranges. We measure the polarization rotation (Re[theta(F)]) and ellipticity (Im[theta(F)]) of transmitted radiation through thin films as the sample is rotated. We observe a twofold rotational symmetry in theta(F), which is associated with linear dichroism (LD) and occurs when electromagnetic radiation polarized along one direction is absorbed more strongly than radiation polarized in the perpendicular direction. Such polarization anisotropies can be generally associated with symmetry breakings. We measure the amplitude of the LD signal and study its temperature, energy, and doping dependence. The LD signal shows a resonant behavior with a peak in the few hundred meV range, which is coincident with the midinfrared optical feature that has been associated with the formation of the pseudogap state. The strongest LD signal is found in underdoped films, although it is also observed in optimally and overdoped samples. The LD signal is consistent with an electronic nematic order which is decoupled from the crystallographic axes as well as novel magnetoelectric effects.

}, keywords = {Materials Science, Physics}, isbn = {2469-9950}, doi = {10.1103/PhysRevB.102.054520}, author = {Mukherjee, A. and Seo, J. and Arik, M. M. and Zhang, H. and Zhang, C. C. and Kirzhner, T. and George, D. K. and Markelz, A. G. and Armitage, N. P. and Koren, G. and Wei, J. Y. T. and Cerne, J.} } @article {252, title = {Long Range Correlated Motions of TIM and their Possible Influence on Enzyme Function}, journal = {Biophysical Journal}, volume = {118}, number = {3}, year = {2020}, note = {ISI Document Delivery No.: KK8YX
Times Cited: 0
Cited Reference Count: 4
Cited References:
Acbas G, 2014, NAT COMMUN, V5, DOI 10.1038/ncomms4076
Niessen K.A. M.Y., 2017, BIOPHYS J, DOI [10.1016/j.bpj.2016.12.049.3., DOI 10.1016/J.BPJ.2016.12.049.3]
Niessen K, 2019, OPT EXPRESS, V27, P28036, DOI 10.1364/OE.27.028036
Niessen KA, 2019, NAT COMMUN, V10, DOI 10.1038/s41467-019-08926-3
McKinney, Jeffrey A. Deng, Yanting George, Deepu K. Richard, John Markelz, Andrea G.
64th Annual Meeting of the Biophysical-Society
Feb 15-19, 2020
San Diego, CA
Biophys Soc
NSFNational Science Foundation (NSF) [DBI 1556359, MCB 1616529]; DOEUnited States Department of Energy (DOE) [DE-SC0016317]; NIH STTRUnited States Department of Health \& Human ServicesNational Institutes of Health (NIH) - USA [R41 GM125486.1]
This work is supported by NSF grants DBI 1556359 and MCB 1616529, DOE grant DE-SC0016317 and NIH STTR R41 GM125486.1.

1
Cell press
Cambridge
1542-0086}, month = {Feb}, pages = {207A-207A}, type = {Meeting Abstract}, abstract = {

The alpha-beta barrel structure of triosephosphate isomerase (TIM) is possibly the most common among enzymes. In the case of TIM, structural dynamics are known to be essential to function. In particular the stabilization of the binding pocket by a phosphodianion {\textquotedblleft}handle{\textquotedblright} of the substrate and the closing of catalytic site loops 6 and 7 over the substrate. Loop 6 moves by as much as 7 Angstroms with binding. Recently a mutant survey for human TIM (hsTIM) found kcat can change significantly for a single mutation distant from the catalytic site. Crystallographic measurements find no structural change with the mutation, suggesting a dynamical mechanism for the allosteric effect. Here we use Stationary Sample Anisotropic Terahertz Microscopy (SSATM) to measure the long-range intramolecular vibrations and determine if specific vibrations couple the allosteric and catalytic sites. SSATM isolated protein long-range structural vibrations based on the dominant displacement direction [1-4]. We examine if specific vibrational bands are associate with loop 6 and loop 7 flexibility.

}, keywords = {Biophysics}, isbn = {0006-3495}, doi = {10.1016/j.bpj.2019.11.1240}, author = {McKinney, J. A. and Deng, Y. T. and George, D. K. and Richard, J. and Markelz, A. G.} } @article {282, title = {Is the Protein Dynamical Transition useful?}, journal = {Biophysical Journal}, volume = {118}, year = {2020}, chapter = {521a}, doi = {10.1016/j.bpj.2019.11.2866}, author = {Sharma, A. and George, D. K. and Crossen, K. and McKinney, J. and Kerfeld, C. and Markelz, A.} } @proceedings {235, title = {Anisotropic Terahertz Microscopy of Protein Collective Vibrations: Crystal Symmetry and Hydration Dependence}, year = {2019}, note = {ISI Document Delivery No.: BQ4OX
Times Cited: 0
Cited Reference Count: 4
Cited References:
Acbas G, 2014, NAT COMMUN, V5, DOI 10.1038/ncomms4076
Legrand L, 2002, ACTA CRYSTALLOGR D, V58, P1564, DOI 10.1107/S0907444902014403
Niessen KA, 2019, NAT COMMUN, V10, DOI 10.1038/s41467-019-08926-3
Niessen KA, 2017, BIOPHYS J, V112, P933, DOI 10.1016/j.bpj.2016.12.049
McKinney, Jeffrey Deng, Yanting Sharma, Akansha George, D. K. Markelz, A. G.
Irmmw-thz
Proceedings Paper
44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)
Sep 01-06, 2019
Paris, FRANCE
Lytid, TYDEX, Swiss Terahertz, Fondat Maison Chimie, CNRS, Lab Physique ENS, Li2S, LUNA, MenloSystems, ENS, PSL Univ Paris, FYLA, ADVANTEST, Springer Nature, Soc Francaise Physique, Sorbonne Univ, Int Soc Infrared Millimeter \& Terahertz Waves, IEEE, GDR NANO THz MIR
NSFNational Science Foundation (NSF) [DBI 1556359, MCB 1616529]; DOEUnited States Department of Energy (DOE) [DE-SC0016317]; NIHUnited States Department of Health \& Human ServicesNational Institutes of Health (NIH) - USA [STTR R41 GM125486]
This work is supported by NSF grants DBI 1556359 and MCB 1616529, DOE grant DE-SC0016317 and NIH STTR R41 GM125486.
345 e 47th st, new york, ny 10017 usa
2162-2027}, publisher = {Ieee}, address = {New York}, abstract = {

A stationary sample anisotropic terahertz microscopy technique is used to characterize the intramolecular vibrations for lysozyme. Tetragonal and triclinic crystals are compared. We find excellent reproducibility within a single crystal symmetry group. Several resonant bands are present for both symmetry groups, indicating they originate with the intramolecular vibrations and not crystal lattice phonons. Bands become more pronounced and higher frequency resonant bands begin to emerge with slight dehydration.

}, isbn = {978-1-5386-8285-2}, doi = {https://doi.org/10.1109/IRMMW-THz.2019.8873722}, author = {McKinney, J. and Deng, Y. T. and Sharma, A. and George, D. K. and Markelz, A. G.} } @article {283, title = {Photo Switching of Protein Dynamical Collectivity}, journal = {arXiv:1906.00893}, year = {2019}, url = {https://arxiv.org/abs/1906.00893}, author = {Xu, M. and George, D. K. and Jimenez, R. and Markelz, A. G.} } @proceedings {230, title = {Stationary Sample Anisotropic THz Spectroscopy using Discretely Tunable THz Sources}, year = {2019}, note = {Irmmw-thz
44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)
Sep 01-06, 2019
Paris, FRANCE
Lytid; TYDEX; Swiss Terahertz; Fondat Maison Chimie; CNRS, Lab Physique ENS; Li2S; LUNA; MenloSystems; ENS; PSL Univ Paris; FYLA; ADVANTEST; Springer Nature; Soc Francaise Physique; Sorbonne Univ; Int Soc Infrared Millimeter \& Terahertz Waves; IEEE; GDR NANO THz MIR
2162-2027}, abstract = {

We demonstrate anisotropic THz spectroscopy of sucrose using newly developed compact discretely tunable THz sources for turn-key spectroscopic systems.

}, isbn = {978-1-5386-8285-2}, doi = {https://doi.org/10.1109/IRMMW-THz.2019.8874234}, author = {LaFave, T., Jr. and George, D. K. and Markelz, A. G. and McNee, Ian and Kozlov, Vladimir and Schunemann, Peter} } @proceedings {185, title = {Tunable Compact Narrow Band THz Sources for Frequency Domain THz Anisotropic Spectroscopy}, volume = {10983}, year = {2019}, note = {ISI Document Delivery No.: BN5PJ
Times Cited: 0
Cited Reference Count: 17
Cited References:
Acbas G, 2014, NAT COMMUN, V5, DOI 10.1038/ncomms4076
Chen JY, 2007, APPL PHYS LETT, V90, DOI 10.1063/1.2748852
Jepsen PU, 2011, LASER PHOTONICS REV, V5, P124, DOI 10.1002/lpor.201000011
Lee Y. S., 2006, APPL PHYS LETT, V89
Lee YS, 2000, APPL PHYS LETT, V76, P2505, DOI 10.1063/1.126390
Lin A., 2013, ANTIPHASE DOMAIN ANN
Niessen K. A., BIOPHYSICAL J, V112, P933
Niessen KA, 2019, NAT COMMUN, V10, DOI 10.1038/s41467-019-08926-3
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PARSONS DF, 1971, APPL OPTICS, V10, P1683
Singh R., 2013, PHYSICS
Strachan CJ, 2005, J PHARM SCI-US, V94, P837, DOI 10.1002/jps.20281
Tassev V., 2013, SPIE LASE, V9
Tekavec P., 2017, FRONTIERS OPTICS 201
Tonouchi M, 2007, NAT PHOTONICS, V1, P97, DOI 10.1038/nphoton.2007.3
Walther M, 2003, CHEM PHYS, V288, P261, DOI 10.1016/S0301-0104(03)00031-4
Zeitler JA, 2009, EUR J PHARM BIOPHARM, V71, P2, DOI 10.1016/j.ejpb.2008.08.012
George, D. K. LaFave, T. J. Markelz, A. G. Mcnee, Ian Tekavec, Patrick Kozlov, Vladimir Schunemann, Peter
LaFave, Tim/0000-0003-2925-8657
NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCESUnited States Department of Health \& Human ServicesNational Institutes of Health (NIH) - USANIH National Institute of General Medical Sciences (NIGMS) [R41GM125486] Funding Source: NIH RePORTER; NIGMS NIH HHSUnited States Department of Health \& Human ServicesNational Institutes of Health (NIH) - USANIH National Institute of General Medical Sciences (NIGMS) [R41 GM125486] Funding Source: Medline
0277-786x
1098311}, month = {Apr 15-17}, publisher = {Spie-Int Soc Optical Engineering}, address = {Baltimore, MD}, abstract = {

We demonstrate frequency domain THz anisotropy signature detection for protein crystal models using newly developed compact tunable narrow band THz sources based on Orientation Patterned Gallium Phosphide for turn-key spectroscopic systems.

}, keywords = {anisotropy, biomolecules, femtosecond, optical rectification, orientation patterned gallium phosphide, Terahertz, THz generation}, isbn = {978-1-5106-2632-4}, doi = {https://doi.org/10.1117/12.2519878}, author = {George, D. K. and LaFave, T. J. and Markelz, A. G. and McNee, I. and Tekavec, P. and Kozlov, V. and Schunemann, P.} } @conference {305, title = {Tunable narrow band sources for anisotropic THz spectroscopy}, booktitle = {APS S23-002}, year = {2019}, month = {02/2019}, url = {https://meetings.aps.org/Meeting/MAR19/Session/S23.2}, author = {George, D. K. and McNee, I. and Tekavec, P. and Kozlov, V. and Schunemann, P. and Markelz, A. G.} } @proceedings {236, title = {Tunable narrowband THz generation in orientation patterned gallium phosphide for THz anisotropy identification}, volume = {10902}, year = {2019}, note = {ISI Document Delivery No.: BM9XB
Times Cited: 2
Cited Reference Count: 8
Cited References:
Fejer M. M., 2013, ANTIPHASE DOMAIN ANN, P258
Jepsen PU, 2011, LASER PHOTONICS REV, V5, P124, DOI 10.1002/lpor.201000011
Lee YS, 2000, APPL PHYS LETT, V76, P2505, DOI 10.1063/1.126390
Niessen K. A., BIOPHYSICAL J, V112, P933
PARSONS DF, 1971, APPL OPTICS, V10, P1683
Singh R., 2013, MODULATED ORIENTATIO
Tassev V., 2013, SPIE LASE, P9
Tekavec P., 2017, FRONTIERS OPTICS 201
McNee, Ian Tekavec, Patrick Kozlov, Vladimir Markelz, A. G. George, D. K. Schunemann, Peter
Proceedings Paper
Conference on Nonlinear Frequency Generation and Conversion - Materials and Devices XVIII
Feb 05-07, 2019
San Francisco, CA
Spie
1000 20th st, po box 10, bellingham, wa 98227-0010 usa
0277-786x
Unsp 1090218}, publisher = {Spie-Int Soc Optical Engineering}, address = {Bellingham}, abstract = {

We demonstrate tunable narrowband THz generation by optical rectification of a femtosecond pulse in Orientation Patterned Gallium Phosphide. Center frequencies of 0.9 - 3.8 THz with average power up to 15 mu W were achieved using a 1.064 mu m fiber laser for the pump laser. Biomolecular characterization for an early application of this system is also shown in this work by anisotropic spectroscopic signature detection of molecular crystals in the THz region.

}, keywords = {anisotropy, biomolecules, femtosecond, optical rectification, orientation patterned gallium phosphide, Terahertz, THz generation}, isbn = {978-1-5106-2447-4}, doi = {https://doi.org/10.1117/12.2510522}, author = {McNee, I. and Tekavec, P. and Kozlov, V. and Markelz, A. G. and George, D. K. and Schunemann, P.}, editor = {Schunemann, P. G. and Schepler, K. L.} } @proceedings {226, title = {THz Anisotropy Identification using Tunable Compact Narrow Band THz Sources}, year = {2018}, note = {ISI Document Delivery No.: BL3GO
Times Cited: 0
Cited Reference Count: 6
Cited References:
Dhillon SS, 2017, J PHYS D APPL PHYS, V50, DOI 10.1088/1361-6463/50/4/043001
Lee YS, 2000, APPL PHYS LETT, V76, P2505, DOI 10.1063/1.126390
Lin A., 2013, ANTIPHASE DOMAIN ANN, P258
Niessen KA, 2017, BIOPHYS J, V112, P933, DOI 10.1016/j.bpj.2016.12.049
Tassev V., 2013, SPIE LASE, P9
Tekavec P., 2017, FRONTIERS OPTICS 201
George, D. K. Markelz, A. G. Mcnee, Ian Tekavec, Patrick Kozlov, Vladimir Schunemann, Peter
Irmmw-thz
Proceedings Paper
43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)
Sep 09-14, 2018
Nagoya, JAPAN
IEEE Microwave Theory \& Tech Soc, TeraTech, JSPS, JSIR, Japan Soc Appl Phys, IEEJ, CSJ, AIP, APL Photon, AIP, Journal Appl Phys, EiC, SPSJ, Terahertz Syst Consortium, AICHI, Nagoya Convent \& Visitors Bur, ADVANTEST CORP, AmTechs Corp, Menlo Systems GmbH, Nippo Precigion Co Ltd, TeraMetrix LLC Div Luna, ATN Japan LTD, DAHENG NEW EPOCH TECHNOL INC, FEMTO Dev Inc, KYOWA FINTECH Co Ltd, Spectra Design Ltd, TeraView Ltd, TYDEX LLC, Virginia Diodes Inc, PNP, Tydex Res \& Ind Opt, Femtowave, Kyowa Fine Tech Co Ltd, Daheng Opt
345 e 47th st, new york, ny 10017 usa
2162-2027}, publisher = {Ieee}, address = {New York}, abstract = {

We demonstrate THz anisotropy signature determination of a protein crystal model using newly developed compact tunable narrow band THz sources for turn-key spectroscopic systems for the bio molecular community.

}, isbn = {978-1-5386-3809-5}, doi = {https://doi.org/10.1109/IRMMW-THz.2018.8510291}, author = {George, D. K. and Markelz, A. G. and McNee, I. and Tekavec, P. and Kozlov, V. and Schunemann, P.} } @article {242, title = {Modulated orientation-sensitive terahertz spectroscopy}, journal = {Photonics Research}, volume = {4}, number = {3}, year = {2016}, note = {ISI Document Delivery No.: DM9BJ
Times Cited: 6
Cited Reference Count: 40
Cited References:
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Singh, Rohit George, Deepu Koshy Bae, Chejin Niessen, K. A. Markelz, A. G.
George, Deepu/J-9882-2014
George, Deepu/0000-0003-0021-0705
National Science Foundation (NSF)National Science Foundation (NSF) [DBI2959989]; University at Buffalo (UB) [1126960-1-68255]; Los Alamos National Laboratory (LANL)United States Department of Energy (DOE)Los Alamos National Laboratory [1125895-1-71842]; Direct For Biological SciencesNational Science Foundation (NSF)NSF - Directorate for Biological Sciences (BIO) [1556359] Funding Source: National Science Foundation; Div Of Biological InfrastructureNational Science Foundation (NSF)NSF - Directorate for Biological Sciences (BIO) [1556359] Funding Source: National Science Foundation
National Science Foundation (NSF) (DBI2959989); University at Buffalo (UB) (Holm Fund 1126960-1-68255); Los Alamos National Laboratory (LANL) (Molecular Crystal Studies 1125895-1-71842).
6

26
Optical soc amer
Washington}, month = {Jun}, pages = {A1-A8}, type = {Article}, abstract = {

Intramolecular vibrations of large macromolecules reside in the terahertz range. In particular, protein vibrations are closely spaced in frequency, resulting in a nearly continuous vibrational density of states. This density of vibrations interferes with the identification of specific absorption lines and their subsequent association with specific functional motions. This challenge is compounded with the absorption being dominated by the solvent and local relaxational motions. A strategy for removing the isotropic relaxational loss and isolating specific vibrations is to use aligned samples and polarization-sensitive measurements. Here, we demonstrate a technique to rapidly attain the anisotropic resonant absorbance using terahertz time domain spectroscopy and a spinning sample. The technique, modulated orientation-sensitive terahertz spectroscopy (MOSTS), has a nonzero signal only for anisotropic samples, as demonstrated by a comparison between a silicon wafer and a wire grid polarizer. For sucrose and oxalic acid molecular crystals, the MOSTS response is in agreement with modeled results for the intermolecular vibrations. Further, we demonstrate that, even in the presence of a large relaxational background, MOSTS isolates underlying vibrational resonances. (C) 2016 Chinese Laser Press

}, keywords = {absorption-spectroscopy, dynamics, enzyme catalysis, low-frequency modes, lysozyme, neutron-scattering, Optics, perspective, polarization modulation, proteins, water}, isbn = {2327-9125}, doi = {https://doi.org/10.1364/PRJ.4.0000A1}, author = {Singh, R. and George, D. K. and Bae, C. J. and Niessen, K. A. and Markelz, A. G.} } @proceedings {245, title = {Probing the Stability of Fluorescent Proteins by Terahertz Spectroscopy}, year = {2014}, note = {ISI Document Delivery No.: BF0IL
Times Cited: 0
Cited Reference Count: 7
Cited References:
Dean KM, 2011, BIOPHYS J, V101, P961, DOI 10.1016/j.bpj.2011.06.055
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Xu, Mengyang George, D. K. Jimenez, R. Markelz, A. G.
Irmmw-thz
Proceedings Paper
39th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)
Sep 14-19, 2014
Tucson, AZ
THORLABS, Tydex, TOPTICA Photon, Bruker, Gentec EO, Lake Shore Cryotron, Ekspla, Zomega, TeraSense, Insight Product, Emcore, QMC Instruments, TeraView, NeaSpec, Advantest, MenloSystems, Traycer, Microtech Instruments Inc, LongWave Photon, Virginia Diodes Inc, ASU, MTT S, Journal Infrared Millimeter \& Tera Hertz Waves, Tera Hertz Sci \& Technol, Army Res Off
George, Deepu/J-9882-2014
George, Deepu/0000-0003-0021-0705
345 e 47th st, new york, ny 10017 usa
2162-2027}, publisher = {Ieee}, address = {New York}, abstract = {

The higher transmission through tissues of long wavelength light motivates the development of fluorescent proteins with excitation shifted to the red. However red fluorescent proteins (RFPs) are more susceptible to photobleaching than their shorter wavelength counterparts. In particular RFPs are more susceptible to photobleaching [1]. A possible reason for this is a decrease in the structural stability of the beta barrel. Measurements of structural stability include atomic root mean squared displacement \<x(2)\> measured by the X-ray B-factor and neutron quasi elastic scattering. To date, X-ray measurements of RFP{\textquoteright}s do not indicate a structural stability change and systematic scattering studies have not been performed. Using THz dielectric response we examine if the picosecond structural flexibility decreases with increasing FP stability.

}, keywords = {dynamics}, isbn = {978-1-4799-3877-3}, doi = {https://doi.org/10.1109/IRMMW-THz.2014.6956442}, author = {Xu, M. Y. and George, D. K. and Jimenez, R. and Markelz, A. G.} } @inbook {300, title = {Protein Dielectric Response at Terahertz Frequencies: Correlated and Diffusive Contributions}, booktitle = {Terahertz Biomedical Science and Technology}, volume = {edited by Joo Huik Son }, year = {2014}, publisher = {Taylor and Francis }, organization = {Taylor and Francis }, chapter = {11}, doi = {10.1201/b17060 }, author = {George, D. K. and Markelz, A. G.} } @proceedings {218, title = {Measuring phonons in protein crystals}, volume = {8623}, year = {2013}, note = {ISI Document Delivery No.: BGG42
Times Cited: 0
Cited Reference Count: 5
Cited References:
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Acbas, Gheorghe Niessen, Katherine A. George, Deepu K. Snell, Edward Markelz, A. G.
Proceedings Paper
Conference on Ultrafast Phenomena and Nanophotonics XVII
Feb 03-06, 2013
San Francisco, CA
SPIE, Femtolasers Inc
Snell, Edward/G-2055-2018; George, Deepu/J-9882-2014
Snell, Edward/0000-0001-8714-3191; George, Deepu/0000-0003-0021-0705; Markelz, Andrea/0000-0003-0443-4319
National Science Foundation MRI2 [DBI2959989]
We thank the National Science Foundation MRI2 grant DBI2959989 for support.
1000 20th st, po box 10, bellingham, wa 98227-0010 usa
0277-786x
862305}, publisher = {Spie-Int Soc Optical Engineering}, address = {Bellingham}, abstract = {

Using Terahertz near field microscopy we find orientation dependent narrow band absorption features for lysozyme crystals. Here we discuss identification of protein collective modes associated with the observed features. Using normal mode calculations we find good agreement with several of the measured features, suggesting that the modes arise from internal molecular motions and not crystal phonons. Such internal modes have been associated with protein function.

}, keywords = {correlated motions, dynamics, mode, molecular crystals, molecular vibrations, normal modes, phonons, protein dynamics, spectroscopy, Terahertz}, isbn = {978-0-8194-9392-7}, doi = {https://doi.org/10.1117/12.2006275}, author = {Acbas, G. and Niessen, K. A. and George, D. K. and Snell, E. and Markelz, A. G.}, editor = {Betz, M. and Elezzabi, A. Y. and Song, J. J. and Tsen, K. T.} } @inbook {301, title = {Terahertz Spectroscopy of Liquids and Biomolecules}, booktitle = {Terahertz Spectroscopy and Imaging}, year = {2013}, pages = {229-250}, publisher = {Springer-Verlag}, organization = {Springer-Verlag}, chapter = {9}, address = {Berlin-Heidelberg}, doi = {10.1007/978-3-642-29564-5_9}, author = {George, D. K. and Markelz, A. G.} } @article {291, title = {Functional State Dependence of Picosecond Protein Dynamics}, journal = {arXiv:1105.4425}, year = {2012}, url = {http://arxiv.org/0054394}, author = {Chen, J. Y. and George, D. K. and He, Y. and Knab, J. R. and Markelz, A.G.} } @proceedings {307, title = {Multi-component response in multilayer graphene revealed through terahertz and infrared magneto-spectroscopy}, year = {2012}, month = {9/2012}, address = {Wollongong, Australia}, doi = {10.1109/IRMMW-THz.2012.6380102}, author = {Ellis, C. T. and Stier, A. V. and George, D. K. and Tischler, J. G. and Glaser, E. R. and Myers-Ward, R. L. and Tedesco, J. L. and Eddy, C. R. and Gaskill, D. K. and Markelz, A. G. and Cerne, J.} } @article {221, title = {Terahertz Response and Colossal Kerr Rotation from the Surface States of the Topological Insulator Bi2Se3}, journal = {Physical Review Letters}, volume = {108}, number = {8}, year = {2012}, note = {ISI Document Delivery No.: 896NY
Times Cited: 164
Cited Reference Count: 35
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Aguilar, R. Valdes Stier, A. V. Liu, W. Bilbro, L. S. George, D. K. Bansal, N. Wu, L. Cerne, J. Markelz, A. G. Oh, S. Armitage, N. P.
George, Deepu/J-9882-2014; Aguilar, Rolando Valdes/A-6637-2012; Liu, Wei/H-5999-2012; Wu, Liang/C-8715-2015
George, Deepu/0000-0003-0021-0705; Aguilar, Rolando Valdes/0000-0002-4321-4792; Wu, Liang/0000-0003-1696-7809; Markelz, Andrea/0000-0003-0443-4319
"Institute for Quantum Matter" DOE [DE-FG02-08ER46544]; Gordon and Betty Moore FoundationGordon and Betty Moore Foundation; NSFNational Science Foundation (NSF) [MRI-R2 0959989, DMR-1006078, DMR-0845464]; IAMDN of Rutgers University; ONROffice of Naval Research [N000140910749]; Division Of Materials ResearchNational Science Foundation (NSF)NSF - Directorate for Mathematical \& Physical Sciences (MPS) [0845464] Funding Source: National Science Foundation
The authors would like to thank H. D. Drew, J. Hancock, Z. Hao, G. S. Jenkins, A. Kuzmenko, A. MacDonald, N. A. Mecholsky, A. J. Pearson, O. Tchernyshyov, W-K. Tse, and Y. Wan for helpful discussions and/or correspondences. Support for the measurements at JHU was provided under the auspices of the "Institute for Quantum Matter" DOE DE-FG02-08ER46544 and the Gordon and Betty Moore Foundation. The work at UB was supported by NSF MRI-R2 0959989 and NSF DMR-1006078. The work at Rutgers was supported by IAMDN of Rutgers University, NSF DMR-0845464 and ONR N000140910749.
166
3
157
Amer physical soc
College pk}, month = {Feb}, pages = {5}, type = {Article}, abstract = {

We report the THz response of thin films of the topological insulator Bi2Se3. At low frequencies, transport is essentially thickness independent showing the dominant contribution of the surface electrons. Despite their extended exposure to ambient conditions, these surfaces exhibit robust properties including narrow, almost thickness-independent Drude peaks, and an unprecedentedly large polarization rotation of linearly polarized light reflected in an applied magnetic field. This Kerr rotation can be as large as 65 degrees and can be explained by a cyclotron resonance effect of the surface states.

}, keywords = {bi2te3, Physics}, isbn = {0031-9007}, doi = {https://doi.org/10.1103/physrevlett.108.087403}, author = {Aguilar, R. V. and Stier, A. V. and Liu, W. and Bilbro, L. S. and George, D. K. and Bansal, N. and Wu, L. and Cerne, J. and Markelz, A. G. and Oh, S. and Armitage, N. P.} }