International Conferences

 JournalsInternational conferences / Domestic conferences / Patents

  1. [invited] H. Choi, “Dirac Plasmons in Topological Insulator Bi2Se3”, 8th International Conference on Metamaterials, Photonic Crystals and Plasmonics (META 2017), Incheon, Korea, July 2017.
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  2. [invited] H. Choi, “Ultrafast exciton dynamics in atomically-thin 2D materials”, ITC-CSCC 2017, Busan, Korea, July 2017.
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  3. [invited] H. Choi, “Exciton-selective optical Stark effect in atomically thin ReS2”, The 4th Muju International Winter School Series, Muju, Korea, February 2017.
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  4. [invited] H. Choi, “Selective optical Stark effect of anisotropic excitons in atomically thin ReS2”, 9th Singapore International Chemistry Conference, Singapore, Singapore, December 2016.
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  5. [invited] H. Choi, “Ultrafast time-resolved exciton dynamics in 2D materials”, RPGR 2016 8th International Conference on Recent Progress in Graphene / 2D Research, Seoul, Korea, September 2016.
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  6. [invited] H. Choi, “Nonlinear terahertz-wave generation using graphene metadevices”, URSI Asia-Pacific Radio Science Conference 2016, Seoul, Korea, August 2016.
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  7. J. Kim, H. Jang, Nikesh Koirala, S. Sim, J. Lee, U. Kim, H. Lee, S. Cha, C. In, J. Park, J. Lee, Matthew Brahlek, J. Moon, Maryam Salehi, S. Oh, J. Ahn, S. Hwang, D. Kim, H. Choi, “Gate-tunable, high-reponsivity, and room-temperature infrared photodetectors based on a graphene-Bi2Se3 heterostructure”, CLEO 2016, San Jose, CA, USA, June 2016.
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  8. S. Sim, J. Park, Nikesh Koirala, S. Lee, Mattew Brahlek, J. Moon, Maryam Salehi, J. Kim, S. Cha, J. Sung, M. Jo, S. Oh, H. Choi, “Ultrafast optical control of plasmon-phonon interaction using topological phase transition in (Bi1-xInx)2Se3”, CLEO 2016, San Jose, CA, USA, June 2016.
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  9. C. In, S. Sim, J. Park, J. Kim, S. Park, Nikesh Koirala, Mattew Brahlek, J. Moon, Maryam Salehi, S. Oh, H. Choi, “Hybridization of anti-dipole plasmon oscillation and phonon in the topological insulator Bi2Se3”, CLEO 2016, San Jose, CA, USA, June 2016.
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  10. H. Choi, “Ultrafast dynamics of surface plasmons in topological insulators”, Asia-pacific Laser Symposium 2016, Jeju, Korea, May 2016.
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  11. S. Cha, J. Sung, S. Sim, J. Park, H. Heo, M. Jo, H. Cho, “Ultrafast mid-infrared 1s intraexcitonic spectroscopy in monolayer MoS2”, Graphene 2016, Genoa, Italy, April 2016.
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  12. [invited] H. Choi, “Ultrafast THz investigation of photoexcited Dirac carriers in topological insulators”, CNRS-EHWA Winter School 2016, Seoul, Korea, January 2016.
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  13. [invited] H. Choi, “Ultrafast photoinduced carrier dynamics in atomically-thin 2D materials and topological insulators”, IMID 2015, Daegu, Korea, August 2015.
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  14. J. Kim, H. Jang, M. Kim, J. Cho, J. Ahn, H. Choi, “Ultrafast terahertz spectroscopy of the inverse giant piezoresistance effect in silicon nanomembranes”, CLEO 2015, San Jose, CA, USA, May 2015.
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  15. S. Sim, Nikesh Koirala, Matthew Brahlek, J.Park, S. Cha, S. Oh, “Topologically tunable Fano resonance in (Bi1-xInx)2Se3”, CLEO 2015, San Jose, CA, USA, May 2015.
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  16. S. Cha, J. Sung, J. Kim, S. Sim, M. Jo, H. Choi, “Ultrafast mid-infrared intraexcitonic spectroscopy of monolayer MoS2”, CLEO 2015, San Jose, CA, USA, May 2015.
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  17. H. Jung, C. In, H. Choi, H. Lee, “ ,” MRS 2015, San Francisco, CA, April 2015.
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  18. S. Cha, J. H. Sung, M. Jo, H. Choi, “Ultrafast mid-infrared intraexcitonic spectroscopy of monolayer MoS2”, APS March Meeting 2015, March 2015.
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  19. S. Sim, Nikesh Koirala, Matthew Brahlek, J. Park, S. Cha, Seongshik Oh, and H. Choi, “Topologically tunable ultrafast Fano interference dynamics.”, APS March Meeting 2015, March 2015.
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  20. [invited] H. Choi, “Nonlinear terahertz-frequency mixing in graphene metadevices,” MIWS, Muju ,Korea, Jan 2015.
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  21. [invited] H. Choi, “Ultrafast terahertz dynamics of exciton and Dirac fermion: transition metal dichalcogenides and topological insulators,” International Conference on Electronic Materials and Nanotechnology for Green Environment (ENGE 2014), Jeju, Korea, Nov 2014.
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  22. J. Kim, J. Oh, C. In, Y. S. Lee, Theodore B. Norris, S. C. Jun, H. Choi, “Observation of rapid carrier relaxation in graphene oxide probed by ultrafast terahertz spectroscopy,” NANO KOREA 2014 Symposium, Seoul, Korea, July 2014.
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  23. S. Cha, Y. Hong, J. Yang, I. Maeng, S. J. Oh, K. Jeong, J. S. Suh, S. Haam, Y. M. Huh, H. Choi, “Exciton dynamics in conducting polymer polyaniline using ultrafast spin-polarized spectroscopy,” Conference on Lasers and Electro-Optics (CLEO 2014), San Jose, CA, June 2014.
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  24. C. In, H. D. Kim, B. Min, H. Choi, “Ultrafast terahertz nonlinear optics in a grapheme-metamaterial device : difference-frequency generation,” Conference on Lasers and Electro-Optics (CLEO 2014), San Jose, CA, June 2014.
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  25. S. Cha, S. C. Lim, S. J. Chae, Y. H. Lee, H. Choi, “Effect of grain-boundary plasmon on the negative terahertz dynamic conductivity in graphene,” Conference on Lasers and Electro-Optics (CLEO 2014), San Jose, CA, June 2014.
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  26. S. Sim, Matthew Brahlek, Nikesh Koirala, S. Cha, S. Oh, H. Choi, “Terahertz dynamics of topological insulator Bi2Se3 : ultrafast photoexcitation suppresses hot-Dirac electron surface scattering,” Conference on Lasers and Electro-Optics (CLEO 2014), San Jose, CA, June 2014.
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  27. J. Kim, J. Oh, C. In, Y. S. Lee, Theodore B. Norris, S. C. Jun, H. Choi, “Observation of rapid carrier relaxation in grapheme oxide probed by ultrafast terahertz spectroscopy,” Conference on Lasers and Electro-Optics (CLEO 2014), San Jose, CA, June 2014.
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  28. [invited] H. Choi, “Ultrafast terahertz nonlinear optics in a grapheme-metamaterial device:difference-frequency generation,” The International Conference on Metamaterials, Photonic Crystals and Plasmonics(META’14), Nanyang, Singapore, May 2014.
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  29. [invited] H. Choi, “Ultrafast terahertz spectroscopy of two-dimensional materials: graphene, MoS2, and topological insulators,” TeraNano 4, Osaka, Japan, Mar 2014.
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  30. [invited] H. Choi, “Ultrafast terahertz spectroscopy of two-dimensional materials: graphene, MoS2, and topological insulators”, MIWS, Muju ,Korea, Feb 2014.
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  31. [invited] H. Choi, “Ultrafast Terahertz and Optical Spectroscopy of Reactive Oxygen Species”, 5th International THz-Bio Workshop, Seoul, Korea, Feb 2014.
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  32. C. In, J. Seo, J. Choi, S. Sim, T. Lee, H. Choi, “Ultrafast terahertz probe of carrier dynamics in individually-aligned silicon nanowires,” ICAMD2013, Jeju, Korea, Dec 2013.
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  33. S. Cha, J. Yang, I. Maeng, S. J. Oh, Y. –M. Huh, H. Choi, “Ultrafast spin-polarized exciton dynamics in conducting polymer polyaniline,” ICAMD2013, Jeju, Korea, Dec 2013.
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  34. J. Choi, H. Jung, H. Lee, H. Choi, “Terahertz time-domain spectroscopy of electromagnetic dipole coupling in layered terahertz metamaterials,” ICAMD2013, Jeju, Korea, Dec 2013.
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  35. J. Choi, S. Lee, H.-D. Kim, B. Min, H. Choi, “Ultrafast control of refractive index in a terahertz graphene metamaterial,” ICAMD2013, Jeju, Korea, Dec 2013.
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  36. Y. Choi, S. Sim, I. Maeng, S. C. Lim, Y. H. Lee, H. Choi, “Ultrafast biexciton dynamics of multiple-exciton generation in PbS dots,” ICAMD2013, Jeju, Korea, Dec 2013.
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  37. S. Sim, J. Park, J. –G. Song, C. In, Y.-S. Lee, H. Kim, H. Choi, “Ultrafast inter-excitonic dynamics in atomically thin MoS2,” ICAMD2013, Jeju, Korea, Dec 2013.
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  38. J. Kim, S. C. Lim, S. J. Chae, I. Maeng, Y. Choi, S. Cha, Y. H. Lee, H. Choi, “Transient dynamics of the oscillator-strength sum in graphene,” ICAMD 2013, Jeju, Korea, Dec 2013.
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  39. S. Sim, M. Brahlek, S. Oh, H. Choi, “Ultrafast terahertz spectroscopy of surface-state dynamics in topological insulator Bi2Se3,The 16th International Symposium the Physics of Semiconductors and Applications (ISPSA2013), Jeju, Korea, July 2013.
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  40. S. Sim, J. Choi, S. Lim, Y. –H. Lee, H. Choi, “Ultrafast intra-excitonic quasiparticle annihilation by exciton-exciton scattering in individually isolated single-walled carbon nanotubes,” Conference on Lasers and Electro-Optics (CLEO 2013), San Jose, CA, Jun 2013.
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  41. J. Choi, S. Sim, J. Seo, J. Lee, H. Han, T. Lee, H. Choi, “Ultrafast optical-pump terahertz-probe spectroscopy of individual silicon nanowires,” Conference on Lasers and Electro-Optics (CLEO 2013), San Hose, CA, Jun 2013.
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  42. J. Choi, S. Lee, H.-D. Kim, B. Min, H. Choi, “Ultrafast refractive index control of gate-controlled graphene-metamaterial hybrid devices,” Conference on Lasers and Electro-Optics (CLEO 2013), San Jose, CA, Jun 2013.
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  43. J. Kim, I. Maeng, J. Jung, H. Song, J. –H. Son, K. Kim, J. Lee, C. -H. Kim, G. Chae, M. Jun, Y. Hwang, S. J. Lee, J. –M. Myoung, and H. Choi, “Terahertz time-domain measurement of non-Drude conductivity in silver nanowire thin films,” Conference on Lasers and Electro-Optics (CLEO 2013), San Francisco, June 2013.
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  44. J. Kim, S. Lim, I. Maeng, Y. Choi, T. Kim, Y. H. Lee, and H. Choi, “Dynamic zero balance of the oscillator-strength sum in graphene,” Conference on Lasers and Electro-Optics (CLEO 2013), San Francisco, June 2013.
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  45. S. Cha, S. Lim, J. Choi, Y. –H. Lee, H. Choi, “Hot-Fermi carrier multiplication in monolayer graphene,” Conference on Lasers and Electro-Optics (CLEO 2013), San Jose, CA, Jun 2013.
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  46. S. Sim, J. Park, J. -G. Song, C. In, H. Kim, H. Choi, “Ultrafast multi-exciton dynamics of few-layer MoS2,Conference on Lasers and Electro-Optics (CLEO 2013), San Jose, CA, Jun 2013.
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  47. Y. Choi, S. Lim, Y. –H. Lee, H. Choi, “Ultrafast red-shift of biexciton binding energy by multiple exciton generation in PbS quantum dots,” Conference on Lasers and Electro-Optics (CLEO 2013), San Jose, CA, Jun 2013.
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  48. J. Kim, S. Lim, I. Maeng, Y. Choi, Y. H. Lee, and H. Choi, “Ultrafast hot Dirac-fermions dynamics in a single-layer graphene,” International Workshop on Optical Terahertz Science and Technology (OTST 2013), Tokyo, Apr 2013.
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  49. J. Choi, S. Lee, H.-D. Kim, B. Min, H. Choi, “Ultrafast terahertz dynamics of Dirac fermions in gate-controlled graphene-metamaterial hybrid devices,” International Workshop on Optical Terahertz Science and Technology (OTST 2013), Kyoto, Japan, Apr 2013.
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  50. Y. Choi, S. Lim, Y. –H. Lee, H. Choi, “Ultrafast pump-probe spectroscopy of carrier multiplication and biexciton effect in PbS quantum dots,” International Workshop on Optical Terahertz Science and Technology (OTST 2013), Kyoto, Japan, Apr 2013.
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  51. S. Sim, J. Choi, S. Lim, Y. –H. Lee, H. Choi, “Ultrafast intra-excitonic exciton-exciton scattering in single-walled carbon nanotubes,” International Workshop on Optical Terahertz Science and Technology (OTST 2013), Kyoto, Japan, Apr 2013.
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  52. S. Cha, S. Lim, J. Choi, Y. –H. Lee, H. Choi, “Ultrafast terahertz probes of hot-carrier multiplication in monolayer graphene,” International Workshop on Optical Terahertz Science and Technology (OTST 2013), Kyoto, Japan, Apr 2013.
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  53. S. Lee, J. Choi, H.-D. Kim, B. Min, H. Choi, “Ultrafast index modulation of a terahertz graphene metamaterial,” The International Conference on Metamaterials, Photonic Crystals and Plasmonics(META’13), Sharjah, UAE, Mar 2013.
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  54. S. Cha, I. Maeng, S. J. Oh, K. Jeong, J. –S. Suh, Y. –M. Huh, H. Choi, “Ultrafast spin response on conducting polymer, polyaniline,” 4th THz-Bio Workshop, Seoul, Korea, Feb2013.
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  55. J. Kim, I. Maeng, S. Sim, C. In, J. Choi, S. Lim, Y. H. Lee, and H. Choi, “Terahertz and mid-infrared spectroscopy of one-dimensional nanostructures,” 4th International THz-Bio Workshop, Seoul, Korea, Feb 2013.
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  56. J. Choi, “Ultrafast THz and Mid-Infrared Intra-excitonic Dynamics of Individualized Semiconducting Carbon Nanotubes,” 3rd International Symposium on Terahertz Nanoscience (TeraNano III), Honolulu, Hawaii, Dec 2012.
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  57. [invited] H. Choi, I. Maeng, S. Lim, S. –J. Chae, Y. –H. Lee, J. –H. Son, “Ultrafast dynamics of graphene nanostructures and devices studied by THz time-domain spectroscopy,” SPIE Optics+Photonics 2012, San Diego, CA, Aug 2012.
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  58. J. Kim, I. Maeng, G. D. Moon, U. Jeong, and H. Choi, “The terahertz conductivities of silver nanowires on an elastomeric substrate,” 3rd International THz-Bio Workshop, Seoul, Korea, Feb 2012.
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  59. H. Choi, “Ultrafast optical-pump and terahertz-probe spectroscopy,” 3rd International THz-Bio Workshop, Seoul, Korea, Feb 2012.
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  60. J. Kim, I. Maeng, G. D. Moon, U. Jeong, and H. Choi, “The terahertz conductivities of silver nanowires on an elastomeric substrate,” 3rd International THz-Bio Workshop, Seoul, Korea, Feb 2012.
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  61. [invited] H. Choi, “Ultrafast terahertz spectroscopy of few-layer graphene,”SPIE Phtonics West 2011, San Francisco, CA, Jan 2011.
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  62. H. Choi, F. Borondics, D. A. Siegel, S. Zhou, M. C. Martin, A. Lanzara, and R. A. Kaindl, “Ultrafast THz response of few-layer epitaxial graphene,” 17thInternational Conference on Ultrafast Phenomena, Snowmass Village, CO, Jul 2010.
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  63. H. Choi, F. Borondics, D. A. Siegel, S. Zhou, M. C. Martin, A. Lanzara, and R. A. Kaindl, “Ultrafast THz dynamics and broadband optical conductivity of few-layer epitaxial graphene,” CLEO/QELS 2010, San Jose, CA, May 2010.
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  64. H. Choi, V.-M. Gkortsas, L. Diehl, F. Capasso, D. Bour, S. Corzine, J. Zhu, G. Hofler, F. X. Kartner, and T. B. Norris, “Time-domain observation of Rabi flopping in a laser,” CLEO/QELS 2010, San Jose, CA, May 2010.
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  65. H. Choi, F. Borondics, D. A. Siegel, S. Zhou, M. C. Martin, A. Lanzara, and R. A. Kaindl, “Ultrafast THz studies of few-layer epitaxial graphene,” OSA 93rdannual meeting Frontiers in Optics 2009 and Laser Science XXV, San Jose, CA, Oct 2009.
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  66. [invited] H. Choi, F. Borondics, D. A. Siegel, S. Zhou, M. C. Martin, A. Lanzara, and R. A. Kaindl, “Ultrafast terahertz studies of Dirac fermion dynamics in graphene,” The 34th International Conference on Infrared, Millimeter, and Terahertz Waves, Busan, Korea, Sep 2009.
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  67. [invited] M. C. Martin, Z. Li, D. Basov, L. M. Zhang, Z. Hao, Y. Zhang, T.-T. Tang, F. Wang, H. Choi, F. Borondics, D.A. Siegel, S.Y. Zhou, C. Girit, A. Zettl, M. F. Crommie, Y. R. Shen, A. Lanzara, and R. A. Kaindl, “Synchrotron infrared investigations of graphene,” 5th International Workshop on Infrared Microscopy and Spectroscopy with Accelerator Based Sources, Baniff, Alberta, Canada, Sep 2009.
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  68. [invited] H. Choi, J. Faist, F. Capasso, and T. B. Norris, “Ultrafast mid-infrared probes of electronic transport dynamics in quantum cascade lasers,” IEEE/LEOS Semiconductor Laser Workshop 2009, Baltimore, MD, May 2009.
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  69. [invited] H. Choi, J. Faist, F. Capasso, and T. B. Norris, “Ultrafast electronic transport and relaxation dynamics in low dimensional semiconductor nanostructures,” SPIE Phtonics West 2009, San Jose, CA, Jan 2009.
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  70. H. Choi, T. B. Norris, L. Diehl, F. Capasso, D. Bour, S. Corzine, J. Zhu, and G. Hofler, “Time-domain measurements of group-velocity dispersion in quantum cascade lasers,” CLEO/QELS 2008, San Jose, CA, May 2008.
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  71. H. Choi, V.-M. Gkortsas, F. X. Kartner, L. Diehl, C.-Y. Wang, F. Capasso, D. Bour, S. Corzine, J. Zhu, G. Hofler, and T. B. Norris, “Femtosecond resonant pulse propagation in quantum cascade lasers: evidence of coherent effects,” CLEO/QELS 2008, San Jose, CA, May 2008.
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  72. H. Choi, L. Diehl, M. Giovanni, J. Faist, F. Capasso, T. B. Norris, “Dynamics of photon-driven electron transport in InGaAs/InAlAs quantum cascade lasers,” 9th International Conference on Intersubband Transitions in Quantum Wells, Ambleside, United Kingdom, Sep 2007.
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  73. H. Choi, L. Diehl, M. Giovanni, J. Faist, F. Capasso, T. B. Norris, “Observation of photon-driven electronic transport in quantum cascade lasers,” CLEO-PR, Seoul, Korea, Aug 2007.
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  74. H. Choi, L. Diehl, M. Giovannini, J. Faist, F. Capasso, T. B. Norris, “Femtosecond pump-probe studies of carrier transport and gain dynamics in quantum cascade lasers,” 15th International Conference on Nonequilibrium Carrier Dynamics in Semiconductors (HCIS-15), Tokyo, Japan, Jul 2007.
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  75. [invited] T. B. Norris, H. Choi, L. Diehl, M. Giovanni, J. Faist, F. Capasso, “Ultrafast gain dynamics and photon-driven electron transport in quantum cascade lasers,” Fundamental Optical Processes in Semiconductors (FOPS-2007), Big Sky, Montena, Jul 2007.
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  76. Z.-K Wu, H. Choi, T.B. Norris, S. Chakrabarti, X.H. Su, and P.K. Bhattacharya, “Investigation of spin-induced Pauli blocking on electron dynamics in n-doped InGaAs/GaAs quantum dots,” CLEO/QELS 2007, Baltimore, MD, May 2007.
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  77. H. Choi, Z.-K. Wu, T. B. Norris, L. Diehl, F. Capasso, J. Faist, “Photon-driven transport in quantum cascade lasers,” CLEO/QELS 2007, Baltimore, MD, May 2007.
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  78. H. Choi and T. B. Norris, “Femtosecond mid-infrared pump-probe studies of transport dynamics in quantum cascade lasers,” 5th Annual Symposium on Relativistic and Sub-Relativistic Intensity Lasers and Their Applications, Ann Arbor, MI, Oct 2006.
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  79. H. Choi, Z.-K. Wu, T. B. Norris, T. Gresch, M. Giovanni, J. Faist, L. Diehl, and F. Capasso, “Time-resolved studies of gain dynamics in quantum cascade laser,” 28th International Conference on the Physics of Semiconductors, Vienna, Austria, Jun 2006.
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  80. Z.-K Wu, H. Choi, T.B. Norris, S. Chakrabarti, X.H. Su, and P.K. Bhattacharya, “Electron dynamics in n-doped InGaAs/GaAs quantum dot Infrared detector structures,” CLEO/QELS 2006, Long Beach, CA, May 2006.
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  81. H. Choi, Z.-K. Wu, T. B. Norris, T. Gresch, M. Giovanni, J. Faist, L. Diehl, and F. Capasso, “Ultrafast gain dynamics in quantum cascade laser,” CLEO/QELS 2006, Long Beach, CA, May 2006.
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  82. [invited] H. Choi, Z.-K. Wu, T. B. Norris, T. Gresch, M. Giovanni, J. Faist, L. Diehl, and F. Capasso, “Ultrafast gain dynamics in quantum cascade lasers,” IEEE/LEOS Semiconductor Laser Workshop 2006, Long Beach, CA, May 2006.
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  83. Z.-K Wu, H. Choi, T.B. Norris, A.D. Stiff-Roberts, and P.K. Bhattacharya, “Ultrafast electronic dynamics in unipolar n-doped InAs/GaAs quantum dot structures,” CLEO/QELS 2005, Baltimore, MD, May 2005.
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  84. Z.-K Wu, H. Choi, A.D. Stiff-Roberts, P.K. Bhattacharya, and T.B. Norris, “Two-photon absorption in quantum dot infrared photodetector,” CLEO/QELS 2003, Baltimore, MD, May 2003.
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  85. [invited] W.-Y. Choi, K.-H. Lee, H. Choi, and J.-H. Seo, “Analysis and suppression of dynamic nonlinear distortions in semiconductor laser diodes,” Contemporary Photonic Technology Conference (CPT 2002), Tokyo, Japan, Jan 2002.
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  86. K. H. Lee, H. Choi, and W.Y.Choi, “Analysis of chromatic dispersion induced second harmonic distortions including semiconductor laser dynamics,” IEEE Microwave Photonics, International Topical Meeting (MWP 2002), Awaji, Japan, Nov 2002.