Guided-mode-resonance transmission color filters for color generation in CMOS image sensors

US7858921B2 · kind B2 · utility

Assignee

• Aptina Imaging Corporation · KY

Inventors

• William A. Stanton · Boise, US
• Fei Wang · Beijing, CN
• Zhong Shi · Boise, US

Key dates

• Filing date: May 5, 2008
• Grant date: Dec 28, 2010
• Expiry date: May 9, 2028

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10F39/8067

Abstract

Imager pixel arrays and methods for forming imager pixel arrays. An image sensor pixel includes a photosensor and a waveguide grating resonance filter formed over the photosensor. The waveguide grating resonance filter is configured to pass light to the photosensor in a wavelength band and to block light outside of the wavelength band. The waveguide grating resonance filter includes a grating material having a first refractive index and arranged in a grating pattern with a grating pitch, and has an effective refractive index that is a function of the first refractive index. A combination of the grating pitch and the effective refractive index is selected to correspond to the wavelength band.