Ultra-wide tuning single channel filter based on one-dimensional photonic crystal with an air cavity

By inserting an air cavity into a one-dimensional photonic crystal of LiF/GaSb, a tunable filter covering the whole visible range is proposed. Following consideration of the dispersion of the materials, through modulating the thickness of the air cavity, we demonstrate that a single resonant peak ca...

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Bibliographic Details
Published in:Journal of semiconductors 2017-02, Vol.38 (2), p.26-30
Main Authors: Zhao, Xiaodan, Yang, Yibiao, Chen, Zhihui, Wang, Yuncai, Fei, Hongming, Deng, Xiao
Format: Article
Language:English
Subjects:
一维光子晶体
单通道
可见光区
可调谐滤波器
周期性
宽调谐
气腔
转移矩阵法
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Summary:By inserting an air cavity into a one-dimensional photonic crystal of LiF/GaSb, a tunable filter covering the whole visible range is proposed. Following consideration of the dispersion of the materials, through modulating the thickness of the air cavity, we demonstrate that a single resonant peak can shift from 416.1 to 667.3 nm in the band gap at normal incidence by means of the transfer matrix method. The research also shows that the transmittance of the channel can be maximized when the number of periodic Li F/Ga Sb layers on one side of the air defect layer is equal to that of the other side. When adding a period to both sides respectively, the full width at half maximum of the defect mode is reduced by one order of magnitude. This structure will provide a promising approach to fabricate practical tunable filters in the visible region with ultra-wide tuning range.
ISSN:1674-4926
DOI:10.1088/1674-4926/38/2/023004