Narrow bandpass tunable terahertz filter based on photonic crystal cavity

被引：33

作者：

He, Jinglong ^{[1
]}

Liu, Pingan ^{[1
]}

He, Yalan ^{[1
]}

Hong, Zhi ^{[1
]}

机构：

[1] China Jiliang Univ, Ctr THz Res, Hangzhou 310018, Zhejiang, Peoples R China

来源：

APPLIED OPTICS | 2012年 / 51卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Crystal filters - Photonic crystals - Bandpass filters;

D O I：

10.1364/AO.51.000776

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We have fabricated a very narrow bandpass tunable terahertz (THz) filter based on a one-dimensional photonic crystal cavity. Since the filter consists of silicon wafers and air spacers, it has a very high quality factor of about 1500. The full width at half maximum (FWHM) of the passband is only about 200 MHz, and the peak transmission is higher than -4 dB. Besides, the central frequency can be tuned rapidly over the entire bandgap with the length of cavity adjusted by a motorized linear stage. Further analytical calculations indicate that a high-Q tunable filter with both high peak transmission and wide tunable range is possible if thinner silicon layers are used. (C) 2012 Optical Society of America

引用

页码：776 / 779

页数：4

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