Browsing by Author "Chen, Mei-Soong"

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Optical properties of a superconducting annular periodic multilayer structure
(2009-11-01)
Chen, Mei-Soong
;
Wu, Chien-Jang
;
Yang, Tzong-Jer
;
電子物理學系
;
Department of Electrophysics
The optical properties of a superconducting annular Bragg reflector (SABR) are theoretically investigated based on the transfer matrix method for the cylindrical waves. For TM wave at an azimuthal mode number, in >= 1, it is found that there exist some novelties compared with the usual superconducting planar Bragg reflector (SPBR). An additional high-reflectance band is seen and some reflection dips near the threshold wavelength of a superconductor are generated as well. These two special results arising from the higher order azimuthal mode of the cylindrical waves are not found in the SPBR. The results suggest that the SABR could be used to design a narrowband transmission Filter or an annular resonator without introducing any physical defect layer in the structure. (C) 2009 Elsevier Ltd. All rights reserved.
Wave properties of an annular periodic multilayer structure containing the single-negative materials
(2009-09-21)
Chen, Mei-Soong
;
Wu, Chien-Jang
;
Yang, Tzong-Jer
;
電子物理學系
;
Department of Electrophysics
The optical properties of an annular periodic multilayer structure containing two kinds of single-negative materials are theoretically investigated based on the transfer matrix method of the cylindrical waves. At the azimuthal mode number m >= 1 and near the magnetic plasma frequency and the electronic plasma frequency for the TE wave and TM wave, respectively. we find that there is an additional high-reflectance band and some reflection dips exist when the plasma frequency is located in the photonic band gap. These two special features arising from the higher order azimuthal mode of the cylindrical waves are not seen in the planar one-dimensional Bragg reflector consisting of the single-negative materials. Such filtering responses provide a feasible way of designing a narrowband resonator without physically introducing any defect layer in the structure. (C) 2009 Elsevier B.V. All rights reserved.