Monolithic broadband multispectral color filter array

Jiewei Xiang; Meiting Song; Yi Zhang; Jennifer Kruschwitz; Jaime Cardenas

doi:10.1117/12.2648538

15 March 2023 Monolithic broadband multispectral color filter array

Jiewei Xiang, Meiting Song, Yi Zhang, Jennifer Kruschwitz, Jaime Cardenas

Proceedings Volume 12432, High Contrast Metastructures XII; 1243208 (2023) https://doi.org/10.1117/12.2648538
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

Multispectral imaging (MSI) provides scenes with multiple narrowband spectral channels. It plays an important role in disciplines such as remote sensing and medical diagnoses. Based on multispectral filter arrays (MSFA), fast and integrated multispectral imaging can be achieved. We demonstrate a wide range multispectral Fabry-Perot (FP) color filter array based on two-dimensional subwavelength gratings and selective suppression. A thin metal layer is added inside the cavity of a FP resonator to selectively suppress the odd-order resonant peaks. The metal layer provides a larger free spectral range and smaller full width at half maximum (FWHM) compared to the conventional FP resonator while maintaining the high transmission. It also reduces the infrared transmission off the reflection range of the distributed Bragg mirror of the FP resonator. With selective suppression, we can exploit the second-order resonant peak by suppressing the odd-order resonant peaks. The smaller reflection phase shift and FWHM of the second-order transmission peak enable a wide range MSFA covering a spectrum from red to NIR (630nm-960nm) with FWHM smaller than 30nm. To be able to tune the resonant peak, we pattern nano-rods with grating or mesh structures in the cavity layers. By manipulating the shape and the size of nano-rods, we can tune the transmission peaks without changing the physical thicknesses of the layers. This has the promise of a monolithic broadband multispectral color filter array and paves the way for one-shot multispectral imaging.

Conference Presentation

Citation Download Citation

Jiewei Xiang, Meiting Song, Yi Zhang, Jennifer Kruschwitz, and Jaime Cardenas "Monolithic broadband multispectral color filter array", Proc. SPIE 12432, High Contrast Metastructures XII, 1243208 (15 March 2023); https://doi.org/10.1117/12.2648538

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available