TY - JOUR
T1 - Wave properties in asymmetric single-negative-base photonic crystals
AU - King, Tzu Chyang
AU - Wu, Yi Huan
AU - Li, Zhe Wei
AU - Huang, Chih Hsi
AU - Wu, Chien Jang
N1 - Publisher Copyright:
© 2017 Optical Society of America.
PY - 2017/12/1
Y1 - 2017/12/1
N2 - 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.
AB - 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.
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U2 - 10.1364/AO.56.009452
DO - 10.1364/AO.56.009452
M3 - Article
C2 - 29216058
AN - SCOPUS:85035799083
SN - 1559-128X
VL - 56
SP - 9452
EP - 9456
JO - Applied Optics
JF - Applied Optics
IS - 34
ER -