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Optical Engineering • Open Access

Polarization-selective uncooled infrared sensor with asymmetric two-dimensional plasmonic absorber
Author(s): Shinpei Ogawa; Kyohei Masuda; Yousuke Takagawa; Masafumi Kimata

Paper Abstract

A polarization-selective uncooled infrared (IR) sensor was developed based on an asymmetric two-dimensional plasmonic absorber (2-D PLA). The 2-D PLA has an Au-based 2-D periodic dimple structure, where photons can be manipulated by spoof surface plasmon polaritons. Asymmetry was introduced into the 2-D PLA to realize a polarization selective function. Numerical investigations demonstrate that a 2-D PLA with ellipsoidal dimples (2-D PLA-E) gives rise to polarization-dependent absorption properties due to the asymmetric dimple shape. A microelectromechanical systems-based uncooled IR sensor was fabricated using a 2-D PLA-E through complementary metal oxide semiconductor (CMOS) and micromachining techniques. The 2-D PLA-E was formed with an Au layer sputtered on a SiO2 layer with ellipsoidal holes. The dependence of the responsivity on the polarization indicates that the responsivity is selectively enhanced according to the polarization and the asymmetry of the ellipsoids. The results provide direct evidence that a polarization-selective uncooled IR sensor can be realized simply by the introduction of asymmetry to the surface structure of the 2-D PLA, without the need for a polarizer or optical resonant structures. In addition, a pixel array where each pixel has a different detection polarization could be developed for polarimetric imaging using standard CMOS and micromachining techniques.

Paper Details

Date Published: 28 October 2014
PDF: 5 pages
Opt. Eng. 53(10) 107110 doi: 10.1117/1.OE.53.10.107110
Published in: Optical Engineering Volume 53, Issue 10
Show Author Affiliations
Shinpei Ogawa, Mitsubishi Electric Corp. (Japan)
Kyohei Masuda, Ritsumeikan Univ. (Japan)
Yousuke Takagawa, Ritsumeikan Univ. (Japan)
Masafumi Kimata, Ritsumeikan Univ. (Japan)

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