title: Narrowband multichannel filters and integrated optical filter arrays.
abstract: We propose and demonstrate three approaches to achieve narrowband multichannel filters. These are multiple heterostructures with defects, guided-mode resonance (GMR) Brewster filters with multiple channels, and integrated narrow bandpass filter arrays. Transmission studies for multiple heterostructures with defects are presented. We show that the enlargement of the forbidden band and multiple-channel filtering can be reached simultaneously with these configurations. GMR Brewster filters with multiple channels can be obtained with a single-layer grating. The same properties can be obtained by use of double-layer structures that consist of a homogeneous layer and a grating with equal refractive index. We developed a combinatorial etching technique that has 32 elements on a single substrate with which to fabricate integrated narrow bandpass filters. Single- and double-chamber integrated optical filter arrays were fabricated by use of this etching technique. These narrowband multichannel filters and narrow bandpass filter arrays show good filtering features and can be utilized in many optical applications.
authors.affiliation: Department of Physics, Institute of Precision Optical Engineering, Tongji University, Shanghai 200092, China. wangzs@mail.tongji.edu.cn
authors.forename: Zhanshan
authors.initials: Z
authors.lastname: Wang
authors.forename: Tian
authors.initials: T
authors.lastname: Sang
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.forename: Hongfei
authors.initials: H
authors.lastname: Jiao
authors.forename: Yonggang
authors.initials: Y
authors.lastname: Wu
authors.forename: Jingtao
authors.initials: J
authors.lastname: Zhu
authors.forename: Lingyan
authors.initials: L
authors.lastname: Chen
authors.forename: Shao-Wei
authors.initials: SW
authors.lastname: Wang
authors.forename: Xiaoshuang
authors.initials: X
authors.lastname: Chen
authors.forename: Wei
authors.initials: W
authors.lastname: Lu