Open AccessCavity-driven hybrid plasmonic ultra-narrow bandpass filter
Author(s) -
Jinbo Gao,
Jinsong Gao,
Haijian Yang,
Hai Liu,
Xiaoyi Wang,
Ke Wang,
Xiaoyi Liu,
Qiang Li,
Yanchao Wang,
Zizheng Li,
Ruoqian Gao,
Zhuo Zhang
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.020397
Subject(s) - optics , plasmon , materials science , band pass filter , narrowband , fano resonance , grating , optoelectronics , transmittance , coupling (piping) , filter (signal processing) , stopband , physics , computer science , metallurgy , computer vision
We propose a novel compound grating structure that exhibits a tunable ultra-narrowband transmission in the near infrared regime. The thin microstructure can realize a steep wave form through a Fano-like resonance by coupling different propagation-type SPP modes and with a narrow line width formed by the energy band gap. Additionally, the out-of-band suppression is remarkably enhanced. It effectively solves the constraint relationship between high transmittance, narrow line width, and weak side peak of the plasmonic filter, and the structure is suitable for integration with detectors in the near infrared regime.