NDLI: Flattened Broadband Notch Filters Using Guided-Mode Resonance Associated With Asymmetric Binary Gratings

Content Provider	IEEE Xplore Digital Library
Author	Che-Lung Hsu Mount-Learn Wu Yung-Chih Liu Yun-Chih Lee Jenq-Yang Chang
Copyright Year	1989
Abstract	In this letter, the broadband notch filter exhibiting a flattened bandstop spectral response is experimentally demonstrated for the first time by using the guided-mode resonance associated with the periodic subwavelength structure possessing asymmetric binary grating profiles. The proposed filter consisting of grating and waveguide structures is realized by utilizing a single-layer poly-silicon film deposited on a quartz substrate. The asymmetric grating profile is carried out by dividing the one-filling-factor binary structure into the one with two distinct filling factors within one identical period. A flat bandstop spectral response at the central wavelength of 1.22 mum is obtained under normal incidence for transverse-electric polarization. Its transmittance of bandstop spectrum can be suppressed as low as -20dB within a broad spectral range of 85 nm and its corresponding Deltalambda/lambda is larger than 6%. The spectra under oblique incidence are demonstrated to verify the proposed filter has a high immunity for the angular deviation up to 20deg
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	2572
Ending Page	2574
Page Count	3
File Size	851338
File Format	PDF
ISSN	10411135
Volume Number	18
Issue Number	24
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Resonance Gratings Optical filters Optical waveguides Optical reflection Band pass filters Passband Periodic structures Optical refraction Optical diffraction planar waveguide Diffraction grating guided-mode resonance notch filter
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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