스포츠 토토 라이브 스코어PHYSICS/BK21 Colloquium[09
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| “Photonic crystals, metamaterials, and quantum metamaterials” Ø* Speaker :토토 승무패Prof. Jeong Weon Wu [Ewha Womans University] Ø* Place : Physics Seminar Room (Science Bldg, 3-201) Ø* Date & Time : Oct,토토 승무패30(Fri)토토 승무패4:00 ~ 5:00 pm ØAbstract In an optical medium possessing a spatial distribution토토 승무패of토토 승무패refractive토토 승무패index토토 승무패with토토 승무패periodicity on the order of wavelength, there exists a photonic band gap토토 승무패similar토토 승무패to토토 승무패the토토 승무패band토토 승무패gap토토 승무패in semiconductors.토토 승무패We call these optical medium the photonic crystals. By varying the incident light intensity or by use of external electric field, the band gap of토토 승무패photonic토토 승무패crystal토토 승무패can토토 승무패be controlled, which enables a realization of various photonic switching. Artificial optical media possessing the spatial distribution of refractive index토토 승무패smaller토토 승무패than토토 승무패wavelength토토 승무패are토토 승무패called metamaterials. When the spatial distribution is on the order of micrometer, THz metamaterials can be obtained, while the optical metamaterials can토토 승무패be토토 승무패realized토토 승무패in토토 승무패the토토 승무패nano-structured artificial optical medium.토토 승무패In these metamaterials,토토 승무패the optical property not existing in토토 승무패nature can be observed and a variety of new symmetric structures can be designed. By manipulating the boundaries of graphenes,토토 승무패the propagation of De Broglies wave can be tailored, which is called quantum metamaterial. In quatum토토 승무패metamaterials,토토 승무패phenomena토토 승무패can토토 승무패observed토토 승무패those 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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