@article {239, title = {Near-field THz micropolarimetry}, journal = {Optics Express}, volume = {27}, number = {20}, year = {2019}, note = {ISI Document Delivery No.: JB0XT
Times Cited: 1
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Niessen, Katherine Deng, Yanting Markelz, A. G.
National Science FoundationNational Science Foundation (NSF) [DBI 1556359, MCB 1616529]; U.S. Department of EnergyUnited States Department of Energy (DOE) [DE-SCO016317]; National Institute of General Medical SciencesUnited States Department of Health \& Human ServicesNational Institutes of Health (NIH) - USANIH National Institute of General Medical Sciences (NIGMS) [STTR R41 GM125486]
National Science Foundation (DBI 1556359, MCB 1616529); U.S. Department of Energy DE-SCO016317); National Institute of General Medical Sciences (STTR R41 GM125486).
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Optical soc amer
Washington}, month = {Sep}, pages = {28036-28047}, type = {Article}, abstract = {

We introduce a method for rapid determination of anisotropic terahertz absorption with sub micron resolution and high spectral integrity in the terahertz range. The method is ideal for microscopic and environmentally sensitive materials such as 2-D materials and protein crystals where the anisotropic absorption is critical to understanding underlying physics. We introduce the idea of using an iso-response relationship between the THz polarization and electro optic probe polarization to enable stationary sample polarization measurements covering a full 2 pi polarization dependence measurement. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

}, keywords = {binding, conductivity, dynamics, modes, Optics, polarization modulation, Terahertz, time-domain spectroscopy, wse2}, isbn = {1094-4087}, doi = {https://doi.org/10.1364/OE.27.028036}, author = {Niessen, K. and Deng, Y. T. and Markelz, A. G.} } @conference {285, title = {Rapid Terahertz Dichroism Near Field Microscopy for Biomolecular Intramolecular Vibrational Spectroscopy}, booktitle = {APS 2018}, volume = {A50.008}, year = {2018}, url = {http://meetings.aps.org/link/BAPS.2018.MAR.A50.8}, author = {Deng, Y. and Niessen, K. and Markelz, A.} } @proceedings {246, title = {Anisotropic Absorption Measurements Reveal Protein Dynamical Transition in Intramolecular Vibrations}, year = {2016}, note = {ISI Document Delivery No.: BG7KC
Times Cited: 0
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Niessen K., 2015, BIOPHYSICAL REV
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RUPLEY JA, 1991, ADV PROTEIN CHEM, V41, P37
Xu, Mengyang Niessen, Katherine Michki, Nigel Deng, Yanting Snell, Edward Markelz, A. G.
Irmmw-thz
Proceedings Paper
41st International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)
Sep 25-30, 2016
Copenhagen, DENMARK
DTU, IEEE, QMC Instruments, Danish Ctr Laser Infrastructure, DTU Fotonik, Dept Photon Engn, ARL, Carl Sberg Fdn, AF Off Sci Res, Tech Univ Denmark, IEEE Microwave Theory \& Tech Soc, Azpect Photon, Ekspla, Hubner HF Syst Engn, I2S, Laser Quantum, Menlo Syst, Neaspec, Springer, TeraView, Virginia Diodes
Snell, Edward/G-2055-2018
Snell, Edward/0000-0001-8714-3191
345 e 47th st, new york, ny 10017 usa
2162-2027}, publisher = {Ieee}, address = {New York}, abstract = {

Modeling has predicted that intramolecular structural vibrations enables proteins to access functionally important structural change. We show that the vibrational density of states and the isotropic absorption in the terahertz range are only weakly dependent on the protein functional state for several bench marking proteins. At the same time the direction of motions changes dramatically with functional state and with a resulting impact on the anisotropic absorption. Our anisotropic THz microscopy (ATM) measurements confirm this sensitivity. Here we apply the technique to the question of whether the protein dynamical transition (DT) is important to protein function. We find a strong anisotropic resonance at 70 cm(-1) rapidly increases in strength at temperatures above the DT. As these intramolecular vibrations enable protein structure to change conformation, the results suggest function will cease below DT for those proteins that require large scale conformational change.

}, isbn = {978-1-4673-8485-8}, doi = {10.1109/IRMMW-THz.2016.7758347}, author = {Xu, M. Y. and Niessen, K. and Michki, N. and Deng, Y. T. and Snell, E. and Markelz, A. G.} }