Broadband filter using multi-layer sub-wavelength high-contrast grating structure

doi:10.1007/s12200-014-0444-0

Front. Optoelectron.

2014, Vol. 7

Issue (3) : 393-398 https://doi.org/10.1007/s12200-014-0444-0

RESEARCH ARTICLE

Broadband filter using multi-layer sub-wavelength high-contrast grating structure

Chuan WANG¹,Xi ZHANG¹,Xiaoying LIU^1,^*(

),Yang YUE²,Yong MEI¹,Peng LI¹,Jia DU¹

1. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
2. Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA

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Abstract

This paper proposed a novel broadband filter using multi-layer sub-wavelength high-contrast grating (HCG) structure. This filter has wide bandwidth and good sideband suppression. We simulated and analyzed the effects of different numbers of layers and different grating indexes on filtering performance of the broadband filter. According to the simulated results, we designed a multi-layer HCG broadband filter, which has bandwidth of 843 nm and center wavelength of 1550 nm.

Keywords filter sub-wavelength high-contrast grating (HCG)

Corresponding Author(s): Xiaoying LIU

Online First Date: 13 August 2014 Issue Date: 09 September 2014

Cite this article:

Chuan WANG,Xi ZHANG,Xiaoying LIU, et al. Broadband filter using multi-layer sub-wavelength high-contrast grating structure[J]. Front. Optoelectron., 2014, 7(3): 393-398.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-014-0444-0
https://academic.hep.com.cn/foe/EN/Y2014/V7/I3/393

Fig.1 Schematic of multi-layer HCG broadband filter

Tab.1 HCGs parameters

Fig.2 Reflection spectrum of filter when the number of HCG layer is 2 (a), 3 (b), 4 (c) and 5 (d) respectively

Fig.3 Reflection spectrum of filter when HCG grating refractive index is 2.0 (a), 2.5 (b) and 3.0 (c) respectively

Fig.4 Reflection spectrum of filter with different HCG structures. (a) Low index at the top layer; (b) low index at the second layer; (c) low index at the third layer; (d) low index at the bottom layer

Fig.5 HCG structure with low grating refractive index at top and bottom layers

Fig.6 Reflection spectrum of sideband suppressed multi-layer HCG filter

Fig.7 Reflection spectrum of filter with different incident angles. (a) 0°; (b) 30°; (c) 60°

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