Snapshot multispectral imaging using a diffractive optical network  

作　　者：Deniz Mengu Anika Tabassum Mona Jarrahi Aydogan Ozcan 

机构地区：[1]Electrical and Computer Engineering Department,University of California,Los Angeles,CA 90095,USA [2]Bioengineering Department,University of California,Los Angeles,CA 90095,USA [3]California NanoSystems Institute,University of California,Los Angeles,CA 90095,USA

出　　处：《Light(Science & Applications)》2023年第5期789-808,共20页光（科学与应用)（英文版）

基　　金：supported by the U.S.Department of Energy(DOE),Office of Basic Energy Sciences,Division of Materials Sciences and Engineering under Award#DE-SC0023088.

摘　　要：Multispectral imaging has been used for numerous applications in e.g.,environmental monitoring,aerospace,defense,and biomedicine.Here,we present a diffractive optical network-based multispectral imaging system trained using deep learning to create a virtual spectral filter array at the output image field-of-view.This diffractive multispectral imager performs spatially-coherent imaging over a large spectrum,and at the same time,routes a pre-determined set of spectral channels onto an array of pixels at the output plane,converting a monochrome focal-plane array or image sensor into a multispectral imaging device without any spectral filters or image recovery algorithms.Furthermore,the spectral responsivity of this diffractive multispectral imager is not sensitive to input polarization states.Through numerical simulations,we present different diffractive network designs that achieve snapshot multispectral imaging with 4,9 and 16 unique spectral bands within the visible spectrum,based on passive spatially-structured diffractive surfaces,with a compact design that axially spans ~72λ_(m),where λ_(m) is the mean wavelength of the spectral band of interest.Moreover,we experimentally demonstrate a diffractive multispectral imager based on a 3D-printed diffractive network that creates at its output image plane a spatially repeating virtual spectral filter array with 2×2=4 unique bands at terahertz spectrum.Due to their compact form factor and computation-free,power-efficient and polarization-insensitive forward operation,diffractive multispectral imagers can be transformative for various imaging and sensing applications and be used at different parts of the electromagnetic spectrum where high-density and wide-area multispectral pixel arrays are not widely available.

关 键 词：SPECTRUM SPECTRAL spatially 

分 类 号：O43[机械工程—光学工程]