%0 Conference Proceedings %B Conference on Next-Generation Spectroscopic Technologies XII %D 2019 %T Tunable Compact Narrow Band THz Sources for Frequency Domain THz Anisotropic Spectroscopy %A George, D. K. %A LaFave, T. J. %A Markelz, A. G. %A McNee, I. %A Tekavec, P. %A Kozlov, V. %A Schunemann, P. %? Spie, %? Univ Buffalo, Dept Phys Buffalo N. Y. U. S. A. %? Microtech Instruments, Eugene O. R. U. S. A. %? Bae Syst, P. O. B. Nashua N. H. U. S. A. %K anisotropy %K biomolecules %K femtosecond %K optical rectification %K orientation patterned gallium phosphide %K Terahertz %K THz generation %X

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.

%B Conference on Next-Generation Spectroscopic Technologies XII %S Proceedings of SPIE %I Spie-Int Soc Optical Engineering %C Baltimore, MD %V 10983 %8 Apr 15-17 %@ 978-1-5106-2632-4 %G English %M WOS:000484438200016 %1 BELLINGHAM %2 2019 %( Next-generation spectroscopic technologies xii %R https://doi.org/10.1117/12.2519878 %0 Conference Paper %B APS S23-002 %D 2019 %T Tunable narrow band sources for anisotropic THz spectroscopy %A George, D. K. %A McNee, I. %A Tekavec, P. %A Kozlov, V. %A Schunemann, P. %A Markelz, A. G. %B APS S23-002 %8 02/2019 %G eng %U https://meetings.aps.org/Meeting/MAR19/Session/S23.2 %0 Conference Proceedings %B Nonlinear Frequency Generation and Conversion: Materials and Devices Xviii %D 2019 %T Tunable narrowband THz generation in orientation patterned gallium phosphide for THz anisotropy identification %A McNee, I. %A Tekavec, P. %A Kozlov, V. %A Markelz, A. G. %A George, D. K. %A Schunemann, P. %E Schunemann, P. G. %E Schepler, K. L. %K anisotropy %K biomolecules %K femtosecond %K optical rectification %K orientation patterned gallium phosphide %K Terahertz %K THz generation %X

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.

%B Nonlinear Frequency Generation and Conversion: Materials and Devices Xviii %S Proceedings of SPIE %I Spie-Int Soc Optical Engineering %C Bellingham %V 10902 %@ 978-1-5106-2447-4 %G English %M WOS:000471820400020 %R https://doi.org/10.1117/12.2510522 %0 Conference Proceedings %B 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves %D 2018 %T THz Anisotropy Identification using Tunable Compact Narrow Band THz Sources %A George, D. K. %A Markelz, A. G. %A McNee, I. %A Tekavec, P. %A Kozlov, V. %A Schunemann, P. %X

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.

%B 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves %S International Conference on Infrared Millimeter and Terahertz Waves %I Ieee %C New York %@ 978-1-5386-3809-5 %G English %M WOS:000449683700444 %R https://doi.org/10.1109/IRMMW-THz.2018.8510291 %0 Book Section %B Terahertz Spectroscopy and Imaging %D 2013 %T Terahertz Spectroscopy of Liquids and Biomolecules %A George, D. K. %A Markelz, A. G. %B Terahertz Spectroscopy and Imaging %I Springer-Verlag %C Berlin-Heidelberg %P 229-250 %G eng %& 9 %R 10.1007/978-3-642-29564-5_9 %0 Journal Article %J Physical Review Letters %D 2012 %T Terahertz Response and Colossal Kerr Rotation from the Surface States of the Topological Insulator Bi2Se3 %A Aguilar, R. V. %A Stier, A. V. %A Liu, W. %A Bilbro, L. S. %A George, D. K. %A Bansal, N. %A Wu, L. %A Cerne, J. %A Markelz, A. G. %A Oh, S. %A Armitage, N. P. %K bi2te3 %K Physics %X

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.

%B Physical Review Letters %V 108 %P 5 %8 Feb %@ 0031-9007 %G English %9 Article %M WOS:000300576000025 %] 087403 %R https://doi.org/10.1103/physrevlett.108.087403