A Mid-Infrared Dual-Band Filter With Ultra-High Resolving Power

被引：4

作者：

He, Xin ^{[1
]}

Jie, Jinliang ^{[2
]}

Yang, Junbo ^{[1
]}

Han, Yunxin ^{[1
]}

Zhang, Sen ^{[1
]}

机构：

[1] Natl Univ Def Technol, Dept Phys, Changsha 410073, Peoples R China

[2] Natl Univ Def Technol, Coll Aerosp Sci & Engn, Changsha 410073, Peoples R China

来源：

IEEE PHOTONICS JOURNAL | 2020年 / 12卷 / 04期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Subwavelength structures; filters; spectroscopy; PERFECT ABSORBER; BOUND-STATES; EFFICIENT;

D O I：

10.1109/JPHOT.2020.3006890

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A mid-infrared (mid-IR) dual-band filter with ultra-high resolving power is designed and numerically investigated. It is composed of an Al2O3 layer between a gold grating and a CaF2 substrate. Each unit cell of the grating consists of two gold strips with different heights. The filter provides two high-extinction ultra-narrow stop bands. One is at a wavelength of similar to 3.8392 mu m with a full-width at half-maximum (FWHM) of similar to 0.8 nm, and the other is at a wavelength of similar to 3.8435 mu m with a FWHMof similar to 1.8 nm. The resolving power of the filter is >2100. The two stop bands result from the (+1) and (-1) waveguide modes, respectively. An interaction between the two resonance modes exists and affects the stop bands. We can control the interaction by adjusting the grating parameters, thus designing the FWHMs and lineshapes of the two stop bands flexibly.

引用

页数：11

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