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Browsing Department of Physics by Author "Lee, Yun-Shik"

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Browsing Department of Physics by Author "Lee, Yun-Shik"

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  • Sim, Sangwan; Park, Jusang; Song, Jeong-Gyu; In, Chihun; Lee, Yun-Shik; Kim, Hyungjun; Choi, Hyunyong (American Physical Society, 2013-08-27)
    We report ultrafast pump-probe spectroscopy examining exciton dynamics in atomically thin MoS2. Spectrally and temporally resolved measurements are performed to investigate the interaction dynamics of two important direc ...
  • Danielson, J. R.; Amer, N.; Lee, Yun-Shik (American Institute of Physics, 2006-11-22)
    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 cry ...
  • Lee, Yun-Shik; Hurlbut, Walter C.; Vodopyanov, K. L; Fejer, M. M.; Kozlov, V. G. (American Institute of Physics, 2006-10-30)
    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 orientat ...
  • Amer, N.; Hurlbut, Walter C.; Norton, B. J.; Lee, Yun-Shik; Norris, T. B. (American Institute of Physics, 2005-11-23)
    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 sepa ...
  • Tomaino, J. L.; Jameson, A. D.; Paul, M. J.; Kevek, J. W.; van der Zande, A. M.; Barton, R. A.; Choi, H.; McEuen, P. L.; Minot, E. D.; Lee, Yun-Shik (Springer, 2012-08)
    We demonstrate terahertz (THz) imaging and spectroscopy of single-layer graphene deposited on an intrinsic Si substrate using THz time-domain spectroscopy. A single-cycle THz pulse undergoes multiple internal reflections ...
  • Paul, M. J.; Chang, Y. C.; Thompson, Z. J.; Stickel, A.; Wardini, J.; Choi, H.; Minot, E. D.; Norris, T. B.; Lee, Yun-Shik (IOP Publishing Ltd, 2013-08-22)
    We investigate the response of multi-layer epitaxial graphene and chemical vapor deposition (CVD)-grown single-layer graphene to strong terahertz (THz) fields. Contrary to theoretical predictions of strong nonlinear resp ...
  • Jeong, Young-Gyun; Paul, Michael J.; Kim, Seung-Hyun; Yee, Ki-Ju; Kim, Dai-Sik; Lee, Yun-Shik (American Institute of Physics Publishing, 2013-10-21)
    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 ...
  • Tomaino, J. L.; Jameson, A. D.; Lee, Yun-Shik; Khitrova, G.; Gibbs, H. M.; Klettke, A. C.; Kira, M.; Koch, S.W. (American Physical Society, 2012-06-29)
    Interactions of few-cycle terahertz pulses with the induced optical polarization in a quantum-well microcavity reveal that the lower and higher exciton-polariton modes together with the optically forbidden 2p-exciton sta ...
  • Paul, M. J.; Tomaino, J. L.; Kevek, J. W.; DeBorde, T.; Thompson, Z. J.; Minot, E. D.; Lee, Yun-Shik (American Institute of Physics, 2012-08-29)
    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 ...
  • Lee, Yun-Shik; Amer, N.; Hurlbut, Walter C. (American Institute of Physics, 2003-01-13)
    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 struc ...
  • 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.; Lee, Yun-Shik (American Institute of Physics, 2012-09-10)
    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 elect ...
  • Vodopyanov, K. L.; Fejer, M. M.; Yu, X.; Harris, J. S.; Lee, Yun-Shik; Hurlbut, Walter C.; Kozlov, V. G.; Bliss, D.; Lynch, C. (American Institute of Physics, 2006-10-04)
    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-bon ...
  • Tomaino, J. L.; Jameson, A. D.; Lee, Yun-Shik; Prineas, J. P.; Steiner, J. T.; Kira, M.; Koch, S. W. (Elsevier, 2010)
    Intraexciton transitions in semiconductor quantum wells are modulated by strong and tunable few-cycle terahertz pulses. Time-resolved terahertz-pump and optical-probe measurements demonstrate that the 1s heavy-hole and ...

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