Dr. Rohit P. Prasankumar Profile

Dr. Rohit P. Prasankumar

Scientist at Los Alamos National Lab

SPIE Involvement:

Author

Proceedings Article | 4 August 2021 Presentation

Controlling light-matter interactions in two-dimensional quantum materials with metasurfaces

Long Yuan, Jeeyoon Jeong, Prashant Padmanabhan, Kevin W. Kwock, Ting Shan Luk, P. James Schuck, Dmitry Yarotski, Igal Brener, Rohit Prasankumar

Proceedings Volume 11796, 1179606 (2021) https://doi.org/10.1117/12.2593974

KEYWORDS: Light-matter interactions, Terahertz spectroscopy, Terahertz radiation, Graphene, Excitons, Ultrafast phenomena, Transition metals, Spectroscopes, Semiconductors, Metamaterials

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Proceedings Article | 12 April 2021 Presentation

Probing quantum materials with ultrafast terahertz spectroscopy

Rohit Prasankumar

Proceedings Volume 11725, 1172508 (2021) https://doi.org/10.1117/12.2589622

KEYWORDS: Ultrafast laser spectroscopy, Terahertz spectroscopy, Terahertz radiation, Superconductors, Spectroscopy, Metalloids, Magnetism, Heterojunctions, Graphene

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Proceedings Article | 10 March 2020 Presentation

Ultrafast photocurrents in the Weyl semimetal TaAs (Conference Presentation)

Nicholas Sirica, Rohit Prasankumar, Dmitry Yarotski, Jianxin Zhu

Proceedings Volume 11278, 112780E (2020) https://doi.org/10.1117/12.2548490

KEYWORDS: Metalloids, Ultrafast phenomena, Spectroscopy, Terahertz radiation, Transition metals, Physics, Optical spectroscopy, Terahertz spectroscopy, Emission spectroscopy, Harmonic generation

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Proceedings Article | 12 September 2019 Presentation

Using terahertz pulses to shed new light on Dirac materials (Conference Presentation)

Rohit Prasankumar, Nicholas Sirica, Prashant Padmanabhan, Stephane Boubanga-Tombet, Pamela Bowlan, Dmitry Yarotski, Stuart Trugman, Jianxin Zhu, Antoinette Taylor

Proceedings Volume 11124, 111240L (2019) https://doi.org/10.1117/12.2529438

KEYWORDS: Terahertz radiation, Graphene, Magnetism, Metalloids, Terahertz spectroscopy, Polarization, Emission spectroscopy, Crystals, Magneto-optics, Spectroscopy

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Proceedings Article | 13 May 2019 Presentation + Paper

Observation of the circular photogalvanic effect in the Weyl semimetal TaAs using THz emission spectroscopy

N. Sirica, R. Tobey, L. X. Zhao, G. F. Chen, B. Xu, R. Yang, B. Shen, D. Yarotski, P. Bowlan, S. Trugman, J.-X. Zhu, Y. M. Dai, A. Azad, N. Ni, X. G. Qiu, A. Taylor, R. Prasankumar

Proceedings Volume 10983, 1098314 (2019) https://doi.org/10.1117/12.2520318

KEYWORDS: Terahertz radiation, Crystals, Polarization, Metalloids, Physics, Solar energy, Emission spectroscopy, Second-harmonic generation, Transient nonlinear optics, Mid-IR

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Proceedings Article | 25 September 2017 Presentation

Ultrafast carrier capture and Auger recombination in individual III-nitride nanowires (Conference Presentation)

Stephane Boubanga Tombet, Jeremy Wright, Ping Lu, Michael R. Williams, Changyi Li, George Wang, Rohit Prasankumar

Proceedings Volume 10345, 1034505 (2017) https://doi.org/10.1117/12.2273227

KEYWORDS: Ultrafast phenomena, Carrier dynamics, Optical microscopy, Semiconductors, Quantum wells, Heterojunctions, Optoelectronic devices, Solid state lighting, Nanomaterials, Gallium nitride

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Proceedings Article | 7 March 2014 Paper

Ultrafast optical microscopy on single semiconductor nanowires

Minah Seo, Jinkyoung Yoo, Shadi Dayeh, Samuel Picraux, Antoinette Taylor, Rohit Prasankumar

Proceedings Volume 8984, 89840U (2014) https://doi.org/10.1117/12.2035332

KEYWORDS: Diffusion, Silicon, Ultrafast phenomena, Optical microscopy, Carrier dynamics, Semiconductors, Polarization, Picosecond phenomena, Femtosecond phenomena, Nanowires

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Proceedings Article | 21 February 2011 Paper

Ultrafast density-and-temperature-dependent carrier dynamics in a quantum dots-in-a-well heterostructure

R. Prasankumar, R. Shenoi, J. Urayama, W. Chow, S. Krishna, A. Taylor

Proceedings Volume 7937, 793707 (2011) https://doi.org/10.1117/12.872887

KEYWORDS: Quantum wells, Scattering, Heterojunctions, Picosecond phenomena, Quantum dots, Carrier dynamics, Absorption, Gallium arsenide, Ultrafast phenomena, Phonons

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Proceedings Article | 9 February 2011 Paper

III-nitride nanowires: novel materials for solid-state lighting

George Wang, Qiming Li, Jianyu Huang, A. Alec Talin, Andrew Armstrong, Prashanth Upadhya, Rohit Prasankumar

Proceedings Volume 7954, 79540T (2011) https://doi.org/10.1117/12.872776

KEYWORDS: Gallium nitride, Indium gallium nitride, Solid state lighting, Transmission electron microscopy, Light emitting diodes, Etching, Heterojunctions, Metalorganic chemical vapor deposition, Nanowires, Nanorods

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Proceedings Article | 28 August 2010 Paper

III-nitride nanowires: growth, properties, and applications

George Wang, Qiming Li, Jianyu Huang, A. Alec Talin, Yong Lin, Ilke Arslan, Andrew Armstrong, Prashanth Upadhya, Rohit Prasankumar

Proceedings Volume 7768, 77680K (2010) https://doi.org/10.1117/12.859404

KEYWORDS: Gallium nitride, Nickel, Transmission electron microscopy, Sapphire, Scanning electron microscopy, Heterojunctions, Aluminum nitride, Scanning transmission electron microscopy, Metalorganic chemical vapor deposition, Nanowires

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Proceedings Article | 3 September 2009 Paper

Ultrafast carrier dynamics in semiconductor nanowires

R. Prasankumar, P. Upadhya, Q. Li, N. Smith, S. G. Choi, A. Azad, D. Talbayev, G. Wang, A. Fischer, J. Hollingsworth, S. Trugman, S. Picraux, A. Taylor

Proceedings Volume 7406, 74060E (2009) https://doi.org/10.1117/12.828022

KEYWORDS: Germanium, Semiconductors, Gallium nitride, Picosecond phenomena, Ultrafast laser spectroscopy, Carrier dynamics, Optical spectroscopy, Nanostructures, Ultrafast measurement systems, Nanowires

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Proceedings Article | 8 February 1999 Paper

Characterization of composite microstructure and damage using optical coherence tomography

Joy Dunkers, Carl Zimba, Kathleen Flynn, Donald Hunston, Rohit Prasankumar, Xing Li, James Fujimoto

Proceedings Volume 3585, (1999) https://doi.org/10.1117/12.339850

KEYWORDS: Composites, Optical coherence tomography, Nondestructive evaluation, Spatial resolution, Tomography, Mirrors, Fiber optics, Light sources, Ultrasonics, X-rays

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Showing 5 of 12 publications

Conference Committee Involvement (5)

Terahertz Emitters, Receivers, and Applications XIII

21 August 2022 | San Diego, California, United States

Terahertz Emitters, Receivers, and Applications XII

2 August 2021 | San Diego, California, United States

Terahertz Emitters, Receivers, and Applications XI

24 August 2020 | Online Only, California, United States

Terahertz Emitters, Receivers, and Applications X

11 August 2019 | San Diego, California, United States

Terahertz Emitters, Receivers, and Applications IX

19 August 2018 | San Diego, California, United States

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