报告人： Dai-Sik Kim, Seoul National University, Korea
报告题目：Funneling of terahertz waves through Angstrom-sized double van der Waals gaps
时间：10月21日（周五）
地点：教三440,10:00
Brief Bio:
Prof. Dai-Sik Kim graduated from Seoul National University in 1985 and received his PhD in physics from U. C. Berkeley in 1990. From 1991 to 1993, he was a postdoctoral researcher in AT&T Bell Labs. Prof. Dai-Sik Kim is the Seoul National University Senior Scientist. He is Professor and Director of the Center for subwavelength optics (2008-2015), Center for Angstrom Scale Electromagnetism (2015-present).
Prof. Dai-Sik Kim is a member of the Korean Academy of Science and Technology, Korean Physical Society, Optical Society of Korea, Optical Society of America, American Physical Society. He is the chair of Surface Plasmon Photonics 5, Busan, 2011 (attendees of over 600) and outstanding referee, APS(2011). Dr. Kim’s honors and awards include: Korean Science Award(2013); Seoul National University Research Award(2012);Seoul National University College of Natural Sciences Research Award(2011); American Physical Society Fellow(2011); Optical Society of America Fellow(2009);Sung-Do Optics Scientist Award by Optical Society of Korea(2009); Selected as one of ten ‘Star Faculties’ by Korea Ministry of Education(2005); Korea Young Scientist Award(2002).
Prof. Dai-Sik Kim’s research areas of interest are Terahertz nanotechnology, quantum plasmonics, Optical magnetism, nanomanipulation of quantum materials.
Abstract：
Millimeter and centimeter waves funnel through extreme aspect ratio slot antennas, enhancing molecular cross sections by thousands of times, lowering psudo transition temperatures of vanadium dioxide, generating unprecedented nonlinearities in Angstrom-sale van der Waals gaps via electron tunneling [1-6]. These efforts originated from nearly perfect transmission through terahertz slot antennas with tens of microns of feature size [7-9]. We manufacture millimeters-to-centimeter long, one-nanometer wide slits using photolithography, thin film-graphene deposition and selective etching-exfoliation. These nanometer-wide gaps are infinitely long for the purpose of terahertz applications. Nano, Angstrom and terahertz technologies are made for each other, providing insights into the smallest possible gaps interacting with largest available wavelengths with conventional optics.
[1] Y. M. Bahk et al., “Electromagnetic Saturation of Angstrom-Sized Quantum Barriers at Terahertz Frequencies”, Physical Review Letters 115, 125501(2015) *cover article.
[2] Joon-Yeon Kim et al., “Terahertz Quantum Plasmonics of Nanoslot Antennas in Nonlinear Regime”, Nano Letters 15 (10), 6683-6688 (2015).
[3] Y. G. Jeong et al., “A vanadium dioxide metamaterial disengaged from insulator-to-metal transition, Nano Letters 15 (10), 6318-6323 (2015).
[4] Xiaoshu Chen, H. R. Park et al., “Atomic layer lithography of wafer-scale nanogap arrays for extreme confinement of electromagnetic waves”, Nat. Comm. 4, 2361 (2013).
[5] M. Seo, et al., "Active Terahertz Nanoantennas Based on VO2 Phase Transition," Nano Lett. 10, 2064 (2010).
[6] M. A. Seo et al., “Terahertz field enhancement by a metallic nano slit operating beyond the skin-depth limit”, Nat. Photonics 3, 152 (2009).
[7] J. W. Lee et al., “Terahertz Electromagnetic Wave Transmission through Random Arrays of Single Rectangular Holes and Slits in Thin Metallic Sheets”, Physical Review Letters 99, 137401 (2007).
[8] J. W. Lee et al., “Invisible plasmonic meta-materials through impedance matching to vacuum”, Optics Express 13, 10681 (2005).
[9] J. W. Lee et al., “Shape Resonance Omni-directional Terahertz Filters with Near-unity Transmittance”, Opt. Express 14, 1253 (2006).