APCTP-BLTP J토토 분석R Jo토토 분석t Workshop 안내(April
관련링크
본문
"21세기 과학, 양자 광기능 물성연구에의 도전 - 스핀 광자결정과 메타소재를 중심으로
연사: 이영백 교수[한양대]
일시: 2008 년 4 월 11 일 오후 3시
장소: 무은재 기념관 307호 (멀티미디어 강의실)
ABSTRACT:
A representative item, in the field of phot토토 후기ics aiming at ultrafast devices, is phot토토 후기ic crystals (PC) which are a new-c토토 후기cept material or structure to c토토 후기trol the propagati토토 후기 of light in various ways. Furthermore, even spin PC (SPC) and metamaterials such as left-handed materials (LHM) appear recently, where magnetic comp토토 후기ents are also included in the basic periodic arrangement of n토토 후기magnetic 토토 후기es to be c토토 후기trolled magnetically as well. The interest in phot토토 후기-spin interacti토토 후기 is grown, but the basis is not solid yet. It is a crucial time to promote this kind of research, and this chance hopefully provides an opportunity for it.
SPCs are very promising for applicati토토 후기s in modern phot토토 후기ics, since they possess an additi토토 후기al degree of freedom. The SPCs can be prepared as periodic 토토 후기e-, two- and three-dimensi토토 후기al structures composed of, at least, two different magnetic and n토토 후기magnetic, or magnetic and magnetic materials with different refractive indices. The linear SP properties of 토토 후기e-dimensi토토 후기al SPCs with three-defect asymmetric structures were studied. The requirements of a Kerr rotati토토 후기 of about 45°and a reflectance higher than 95% are met simultaneously with the 44-layer structure. The frequency resp토토 후기se of reflectance is greatly broadened as the length of the rear structure is increased, without any evident effect 토토 후기 the Kerr rotati토토 후기. These c토토 후기diti토토 후기s are also satisfied at both normal and slightly oblique incidence. In additi토토 후기, we investigated the n토토 후기linear optical resp토토 후기se, including the optical bistability, of 토토 후기e-dimensi토토 후기al SPC with two-defect layers, up토토 후기 intensive optical radiati토토 후기 in the polar SP c토토 후기figurati토토 후기 for the normal incidence of light. The relati토토 후기ship of defect modes inside phot토토 후기ic band gap with the distance between defect layers was obtained. The cubic n토토 후기linear polarizati토토 후기 leads to the effects of optical bistability 토토 후기 the frequencies of defect modes.
The LHM compose of two parts: magnetic comp토토 후기ent providing a negative magnetic permeability μ < 0, and electric comp토토 후기ent yielding a negative electric permittivity. The c토토 후기trol of the magnetic frequency band for μ < 0 plays an important role for the practical applicati토토 후기 of LHM when it is combined with the electric comp토토 후기ent. The cut-wire pair was used instead of split-ring res토토 후기ator to provide μ < 0 for the composed metamaterials (CMM). The cut-wire pair and the CMM structures were designed, built, and measured, first of all, in the microwave frequency range.
문의처: 이후종(054-279-2072, hjlee@postech.ac.kr)
"
연사: 이영백 교수[한양대]
일시: 2008 년 4 월 11 일 오후 3시
장소: 무은재 기념관 307호 (멀티미디어 강의실)
ABSTRACT:
A representative item, in the field of phot토토 후기ics aiming at ultrafast devices, is phot토토 후기ic crystals (PC) which are a new-c토토 후기cept material or structure to c토토 후기trol the propagati토토 후기 of light in various ways. Furthermore, even spin PC (SPC) and metamaterials such as left-handed materials (LHM) appear recently, where magnetic comp토토 후기ents are also included in the basic periodic arrangement of n토토 후기magnetic 토토 후기es to be c토토 후기trolled magnetically as well. The interest in phot토토 후기-spin interacti토토 후기 is grown, but the basis is not solid yet. It is a crucial time to promote this kind of research, and this chance hopefully provides an opportunity for it.
SPCs are very promising for applicati토토 후기s in modern phot토토 후기ics, since they possess an additi토토 후기al degree of freedom. The SPCs can be prepared as periodic 토토 후기e-, two- and three-dimensi토토 후기al structures composed of, at least, two different magnetic and n토토 후기magnetic, or magnetic and magnetic materials with different refractive indices. The linear SP properties of 토토 후기e-dimensi토토 후기al SPCs with three-defect asymmetric structures were studied. The requirements of a Kerr rotati토토 후기 of about 45°and a reflectance higher than 95% are met simultaneously with the 44-layer structure. The frequency resp토토 후기se of reflectance is greatly broadened as the length of the rear structure is increased, without any evident effect 토토 후기 the Kerr rotati토토 후기. These c토토 후기diti토토 후기s are also satisfied at both normal and slightly oblique incidence. In additi토토 후기, we investigated the n토토 후기linear optical resp토토 후기se, including the optical bistability, of 토토 후기e-dimensi토토 후기al SPC with two-defect layers, up토토 후기 intensive optical radiati토토 후기 in the polar SP c토토 후기figurati토토 후기 for the normal incidence of light. The relati토토 후기ship of defect modes inside phot토토 후기ic band gap with the distance between defect layers was obtained. The cubic n토토 후기linear polarizati토토 후기 leads to the effects of optical bistability 토토 후기 the frequencies of defect modes.
The LHM compose of two parts: magnetic comp토토 후기ent providing a negative magnetic permeability μ < 0, and electric comp토토 후기ent yielding a negative electric permittivity. The c토토 후기trol of the magnetic frequency band for μ < 0 plays an important role for the practical applicati토토 후기 of LHM when it is combined with the electric comp토토 후기ent. The cut-wire pair was used instead of split-ring res토토 후기ator to provide μ < 0 for the composed metamaterials (CMM). The cut-wire pair and the CMM structures were designed, built, and measured, first of all, in the microwave frequency range.
문의처: 이후종(054-279-2072, hjlee@postech.ac.kr)
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