PHYSICS/ BK21 Colloquium[09.10.30]
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| “Photonic crystals, metamaterials, and quantum metamaterials” Ø* Speaker :토토 바카라Prof. Jeong Weon Wu [Ewha Womans University] Ø* Place : Physics Seminar Room (Science Bldg, 3-201) Ø* Date & Time : Oct,토토 바카라30(Fri)토토 바카라4:00 ~ 5:00 pm ØAbstract In an optical medium possessing a spatial distribution토토 바카라of토토 바카라refractive토토 바카라index토토 바카라with토토 바카라periodicity on the order of wavelength, there exists a photonic band gap토토 바카라similar토토 바카라to토토 바카라the토토 바카라band토토 바카라gap토토 바카라in semiconductors.토토 바카라We call these optical medium the photonic crystals. By varying the incident light intensity or by use of external electric field, the band gap of토토 바카라photonic토토 바카라crystal토토 바카라can토토 바카라be controlled, which enables a realization of various photonic switching. Artificial optical media possessing the spatial distribution of refractive index토토 바카라smaller토토 바카라than토토 바카라wavelength토토 바카라are토토 바카라called metamaterials. When the spatial distribution is on the order of micrometer, THz metamaterials can be obtained, while the optical metamaterials can토토 바카라be토토 바카라realized토토 바카라in토토 바카라the토토 바카라nano-structured artificial optical medium.토토 바카라In these metamaterials,토토 바카라the optical property not existing in토토 바카라nature can be observed and a variety of new symmetric structures can be designed. By manipulating the boundaries of graphenes,토토 바카라the propagation of De Broglies wave can be tailored, which is called quantum metamaterial. In quatum토토 바카라metamaterials,토토 바카라phenomena토토 바카라can토토 바카라observed토토 바카라those appearing in optical metamaterials such as negative refraction and collimation. Contact Person : Prof. Hu-Jong Lee (054-279-2072, ,hjlee@postech.ac.kr) |
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