학술논문
Optical multiplexing using transparency window of good conductors
Document Type
Conference
Source
IEEE Antennas and Propagation Society International Symposium. 1998 Digest. Antennas: Gateways to the Global Network. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.98CH36 Antennas and propagation Antennas and Propagation Society International Symposium, 1998. IEEE. 1:162-165 vol.1 1998
Subject
Language
Abstract
Thin metal films are excellent reflectors and extremely opaque at microwave and mm-wave frequencies. Bulk metal, however, becomes partly transparent at optical frequencies due to the shape of the Lorentz-Drude permittivity function at that frequency regime. We explore this property for designing optical filters composed of a finite number of periodically placed thin metal films, supported by conventional dielectrics. The resulting filters exhibit comb-filter multiplexing characteristics similar to Bragg reflectors at frequencies higher than 10/sup 14/ Hz, but, unlike Bragg reflectors, are completely opaque to any smaller frequencies.