Wave properties in asymmetric single-negative-base photonic crystals

Tzu Chyang King, Yi Huan Wu, Zhe Wei Li, Chih Hsi Huang, Chien Jang Wu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We theoretically study wave properties for one-dimensional defective asymmetric photonic crystals, air∕ABM GBAN ∕air, air∕AQ M GQAN ∕air, and air∕BQ M GQBN ∕air, where A is a lossy epsilon-negative material, B is a lossy mu-negative material, G and Q are dielectrics with different refractive indexes, and M and N are stack numbers with M ≠ N . Special attention has been paid to their absorption spectra. It is found that at certain frequencies the absorption can exhibit unidirectional properties. Our calculated results show two kinds of unidirectional absorption peaks. One is a single absorption peak whose frequency depends on the thickness of defect layer G. For the other peaks, its frequency does not change when the defect layer’s thickness changes. In addition, in the second kind of peaks, the peak numbers for forward and backward propagation are different, that is, there are (M − 1) absorption peaks for forward propagation, while there are (N − 1) absorption peaks for backward propagation. When the two kinds of unidirectional absorption peaks are merged, some new peaks appear, and both forward and backward propagation will have (M + N − 1) absorption peaks.

Original languageEnglish
Pages (from-to)9452-9456
Number of pages5
JournalApplied Optics
Volume56
Issue number34
DOIs
Publication statusPublished - 2017 Dec 1

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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