Index Catalog // ScholarsArchive@OSU

Terahertz imaging of inhomogeneous electrodynamics in single-layer graphene embedded in dielectrics

Creator:: Paul, M. J., Tomaino, J. L., Kevek, J. W., DeBorde, T., Thompson, Z. J., Minot, E. D., and Lee, Yun-Shik
Abstract:: We investigate electron transport properties in large-area, single-layer graphene embedded in dielectric media, using free-space terahertz (THz) imaging and time-domain spectroscopy. Sandwiched between a thin polymethyl methacrylate (PMMA) layer and a Si substrate, graphene layers of different growth recipes exhibit distinctive spatial inhomogeneity of sheet conductivity. The non-contacting, non-destructive THz...
Resource Type:: Article
Full Text:: Institute of Physics. [http://dx.doi.org/10.1063/1.4749280] Graphene has a unique band structure including

Terahertz transmission ellipsometry of vertically aligned multi-walled carbon nanotubes

Creator:: Paul, M. J., Kuhta, N. A., Tomaino, J. L., Jameson, A. D., Maizy, L. P., Sharf, T., Rupesinghe, N. L., Teo, K. B. K., Inampudi, S., Podolskiy, V. A., Minot, E. D., and Lee, Yun-Shik
Abstract:: We demonstrate time-resolved terahertz transmission ellipsometry of vertically aligned multi-walled carbon nanotubes. The angle-resolved transmission measurements reveal anisotropic characteristics of the terahertz electrodynamics in multi-walled carbon nanotubes. The anisotropy is, however, unexpectedly weak: the ratio of the tube-axis conductivity to the transverse conductivity, sigma[subscript z]/sigma[subscript xy] [similar or equal to]...
Resource Type:: Article
Full Text:: nanotubes. VC 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4752158] Carbon nanotubes

Terahertz induced transparency in single-layer graphene

Creator:: Paul, Michael J., Lee, Byounghwak, Wardini, Jenna L., Thompson, Zachary J., Stickel, Andrew D., Mousavian, Ali, Choi, Hyunyong, Minot, Ethan D., and Lee, Yun-Shik
Abstract:: We show that the transmission of a terahertz (THz) pulse through single-layer graphene is strongly nonlinear. As the peak electric field of the THz pulse exceeds 50 kV/cm, the graphene becomes increasingly transparent to the THz radiation. When field strength reaches 800 kV/cm, the increased transparency corresponds to a two-fold...
Resource Type:: Article
Full Text:: Induced Transparency in Single-Layer Graphene. Applied Physics Letters, 105(22), 221107. doi:10.1063

Generation of terahertz pulses with arbitrary elliptical polarization

Creator:: Amer, N., Hurlbut, Walter C., Norton, B. J., Lee, Yun-Shik, and Norris, T. B.
Abstract:: We employ two different methods to generate controllable elliptical polarization of teraherz (THz) pulses. First, THz pulses are generated via optical rectification in nonlinear crystals using a pair of temporally separated and perpendicularly polarized optical pulses. The THz ellipticity is controlled by adjusting the relative time delay and polarization of...
Resource Type:: Article
Full Text:: into elliptical polarization. © 2005 American Institute of Physics. �DOI: 10.1063/1.2138351� Studies of

Terahertz pulse shaping via optical rectification in poled lithium niobate

Creator:: Lee, Yun-Shik, Amer, N., and Hurlbut, Walter C.
Abstract:: We demonstrate a technique for terahertz pulse shaping via optical rectification in the pre-engineered domain structure of poled lithium niobate crystals. The terahertz wave forms coincide with the crystal domain structures. The one-dimensional nonlinear wave equation simulates the experimental results with a good qualitative agreement.
Resource Type:: Article
Full Text:: Physics. @DOI: 10.1063/1.1535268# d di t m ec - b TH th a - ve ar r ca il lo ls s ca an ip m y TH

Terahertz-wave generation in quasi-phase-matched GaAs

Creator:: Vodopyanov, K. L., Fejer, M. M., Yu, X., Harris, J. S., Lee, Yun-Shik, Hurlbut, Walter C., Kozlov, V. G., Bliss, D., and Lynch, C.
Abstract:: The authors demonstrate an efficient room temperature source of terahertz radiation using femtosecond laser pulses as a pump and GaAs structures with periodically inverted crystalline orientation, such as diffusion-bonded stacked GaAs and epitaxially grown orientation-patterned GaAs, as a nonlinear optical medium. By changing the GaAs orientation-reversal period (504–1277 μm), or...
Resource Type:: Article
Full Text:: efficiency of 3.3%. © 2006 American Institute of Physics. �DOI: 10.1063/1.2357551� In the optical

Generation of arbitrary terahertz wave forms in fanned-out periodically poled lithium niobate

Creator:: Danielson, J. R., Amer, N., and Lee, Yun-Shik
Abstract:: The authors demonstrate a flexible terahertz pulse-shaping technique, manipulating spatially dispersed multifrequency components generated by optical rectification in a fanned-out periodically poled lithium niobate crystal. Spatial masks of low pass, high pass, and double slit in front of the crystal manipulate the spatial pattern of the optical excitation beam on...
Resource Type:: Article
Full Text:: Physics. #DOI: 10.1063/1.2392819$ Terahertz pulse shaping has many promising applica- tions, for example

Anisotropic high-field terahertz response of free-standing carbon nanotubes

Creator:: Lee, Byounghwak, Mousavian, Ali, Paul, Michael J., Thompson, Zachary J., Stickel, Andrew D., McCuen, Dalton R., Jang, Eui Yun, Kim, Yong Hyup, Kyoung, Jisoo, Kim, Dai-Sik, and Lee, Yun-Shik
Abstract:: We demonstrate that unidirectionally aligned, free-standing multi-walled carbon nanotubes (CNTs) exhibit highly anisotropic linear and nonlinear terahertz (THz) responses. For the polarization parallel to the CNT axis, strong THz pulses induce nonlinear absorption in the quasi-one-dimensional conducting media, while no nonlinear effect is observed in the perpendicular polarization configuration. Time-resolved...
Resource Type:: Article
Full Text:: carbon nanotubes by generating charge carriers. Published by AIP Publishing. [http://dx.doi.org/10.1063

Large enhancement of nonlinear terahertz absorption in intrinsic GaAs by plasmonic nano antennas

Creator:: Jeong, Young-Gyun, Paul, Michael J., Kim, Seung-Hyun, Yee, Ki-Ju, Kim, Dai-Sik, and Lee, Yun-Shik
Abstract:: We demonstrate remarkably strong nonlinear terahertz (THz) effects in an intrinsic GaAs wafer patterned with a nanometer-width slot antenna array. The antenna near-field reaches 20 MV/cm due to the huge field enhancement in the plasmonic nano-structure (field enhancement factor, α ≅ 50). The THz fields are strong enough to generate high density...
Resource Type:: Article
Full Text:: the antenna. VC 2013 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4826272] Terahertz (THz

Generation of multicycle terahertz pulses via optical rectification in periodically inverted GaAs structures

Creator:: Lee, Yun-Shik, Hurlbut, Walter C., Vodopyanov, K. L, Fejer, M. M., and Kozlov, V. G.
Abstract:: The authors demonstrate the generation of multicycle narrow-bandwidth terahertz pulses in periodically inverted GaAs structures using optical rectification of 2 μm, 100 fs pump pulses. Three different types of orientation-inverted samples are employed: optically contacted multilayer, orientation-patterned, and diffusion-bonded GaAs. The terahertz pulses are characterized by two-color (pump at 2...
Resource Type:: Article
Full Text:: Physics. �DOI: 10.1063/1.2367661� Many nonlinear materials have been examined for tera- hertz generation

ScholarsArchive@OSU

Terahertz imaging of inhomogeneous electrodynamics in single-layer graphene embedded in dielectrics

Terahertz transmission ellipsometry of vertically aligned multi-walled carbon nanotubes

Terahertz induced transparency in single-layer graphene

Generation of terahertz pulses with arbitrary elliptical polarization

Terahertz pulse shaping via optical rectification in poled lithium niobate

Terahertz-wave generation in quasi-phase-matched GaAs

Generation of arbitrary terahertz wave forms in fanned-out periodically poled lithium niobate

Anisotropic high-field terahertz response of free-standing carbon nanotubes

Large enhancement of nonlinear terahertz absorption in intrinsic GaAs by plasmonic nano antennas

Generation of multicycle terahertz pulses via optical rectification in periodically inverted GaAs structures

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