스포츠 토토 판매점PHYSICS/ BK21 Colloquium[09.10.30]
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| “Photonic crystals, metamaterials, and quantum metamaterials” Ø* Speaker :스포츠 토토 판매점Prof. Jeong Weon Wu [Ewha Womans University] Ø* Place : Physics Seminar Room (Science Bldg, 3-201) Ø* Date & Time : Oct,스포츠 토토 판매점30(Fri)스포츠 토토 판매점4:00 ~ 5:00 pm ØAbstract In an optical medium possessing a spatial distribution스포츠 토토 판매점of스포츠 토토 판매점refractive스포츠 토토 판매점index스포츠 토토 판매점with스포츠 토토 판매점periodicity on the order of wavelength, there exists a photonic band gap스포츠 토토 판매점similar스포츠 토토 판매점to스포츠 토토 판매점the스포츠 토토 판매점band스포츠 토토 판매점gap스포츠 토토 판매점in semiconductors.스포츠 토토 판매점We call these optical medium the photonic crystals. By varying the incident light intensity or by use of external electric field, the band gap of스포츠 토토 판매점photonic스포츠 토토 판매점crystal스포츠 토토 판매점can스포츠 토토 판매점be controlled, which enables a realization of various photonic switching. Artificial optical media possessing the spatial distribution of refractive index스포츠 토토 판매점smaller스포츠 토토 판매점than스포츠 토토 판매점wavelength스포츠 토토 판매점are스포츠 토토 판매점called metamaterials. When the spatial distribution is on the order of micrometer, THz metamaterials can be obtained, while the optical metamaterials can스포츠 토토 판매점be스포츠 토토 판매점realized스포츠 토토 판매점in스포츠 토토 판매점the스포츠 토토 판매점nano-structured artificial optical medium.스포츠 토토 판매점In these metamaterials,스포츠 토토 판매점the optical property not existing in스포츠 토토 판매점nature can be observed and a variety of new symmetric structures can be designed. By manipulating the boundaries of graphenes,스포츠 토토 판매점the propagation of De Broglies wave can be tailored, which is called quantum metamaterial. In quatum스포츠 토토 판매점metamaterials,스포츠 토토 판매점phenomena스포츠 토토 판매점can스포츠 토토 판매점observed스포츠 토토 판매점those 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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