Invention Grant
- Patent Title: Narrow band filter with high transmission
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Application No.: US16837312Application Date: 2020-04-01
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Publication No.: US10991739B2Publication Date: 2021-04-27
- Inventor: Cheng Yu Huang , Chun-Hao Chuang , Chien-Hsien Tseng , Kazuaki Hashimoto , Keng-Yu Chou , Wei-Chieh Chiang , Wen-Hau Wu
- Applicant: Taiwan Semiconductor Manufacturing Co., Ltd.
- Applicant Address: TW Hsin-Chu
- Assignee: Taiwan Semiconductor Manufacturing Co., Ltd.
- Current Assignee: Taiwan Semiconductor Manufacturing Co., Ltd.
- Current Assignee Address: TW Hsin-Chu
- Agency: Eschweiler & Potashnik, LLC
- Main IPC: H01L27/146
- IPC: H01L27/146

Abstract:
Various embodiments of the present application are directed to a narrow band filter with high transmission and an image sensor comprising the narrow band filter. In some embodiments, the filter comprises a first distributed Bragg reflector (DBR), a second DBR, a defect layer between the first and second DBRs, and a plurality of columnar structures. The columnar structures extend through the defect layer and have a refractive index different than a refractive index of the defect layer. The first and second DBRs define a low transmission band, and the defect layer defines a high transmission band dividing the low transmission band. The columnar structures shift the high transmission band towards lower or higher wavelengths depending upon a refractive index of the columnar structures and a fill factor of the columnar structures.
Public/Granted literature
- US20200227460A1 NARROW BAND FILTER WITH HIGH TRANSMISSION Public/Granted day:2020-07-16
Information query
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