Integrated spectral-polarization imaging sensor with aluminum nanowire polarization filters

Meenal Kulkarni, Viktor Gruev

Research output: Contribution to journalArticlepeer-review

Abstract

Current division-of-focal-plane polarization imaging sensors can perceive intensity and polarization in real time with high spatial resolution, but are oblivious to spectral information. We present the design of such a sensor, which is also spectrally selective in the visible regime. We describe its extensive spectral and polarimetric characterization. The sensor has a pixel pitch of 5 μm and an imaging array of 168 by 256 elements. Each element comprises spectrally sensitive vertically stacked photodetectors integrated with a 140 nm pitch nanowire linear polarizer. The sensor has a maximum measured SNR of 45 dB, extinction ratio of ∼3.5, QE of 12%, and linearity error of 1% in the green channel. We present sample spectralpolarization images.

Original languageEnglish (US)
Pages (from-to)22997-23012
Number of pages16
JournalOptics Express
Volume20
Issue number21
DOIs
StatePublished - Oct 8 2012
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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