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Proceedings Paper

Design of ultra-thin metallic grating based circular polarizer in the near infrared
Author(s): DeJiao Hu; Ping Wang; Pang Lin; Fuhua Gao; Jinglei Du
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Paper Abstract

The circular polarizers were mostly made of meta-atom based chiral metamaterials (CMMs). Here we propose an ultra-thin metallic grating based circular polarizer, which can convert any polarization into circular polarization. The circular polarizer consists of two layers: an ultra-thin metallic grating embedded in the substrate and a silicon grating on the substrate surface. The ultra-thin metallic grating, which is thinner than the skin depth and was shown to hold anomalous resonant reflection for transverse magnetic (TM) wave, functions as a quarter-wave plate. We show that the ultra-thin metallic grating based quarter-wave plate can transmit circular polarized wave when the incident linear polarized wave is oriented properly. The silicon grating acts as a linear polarizer which restricts the polarization of the light that reaches the metallic grating. Unlike some of the CMMs, our structure is independent of the incident polarization state. Moreover, the fabrication of our circular polarizer is easier than other double-layer-CMMs, in which the relative position between the two layers must be precisely controlled. Our structure can find its application integrated photonic devices.

Paper Details

Date Published: 28 August 2015
PDF: 6 pages
Proc. SPIE 9609, Infrared Sensors, Devices, and Applications V, 96090M (28 August 2015); doi: 10.1117/12.2187598
Show Author Affiliations
DeJiao Hu, Sichuan Univ. (China)
Ping Wang, Sichuan Univ. (China)
Pang Lin, Sichuan Univ. (China)
Fuhua Gao, Sichuan Univ. (China)
Jinglei Du, Sichuan Univ. (China)

Published in SPIE Proceedings Vol. 9609:
Infrared Sensors, Devices, and Applications V
Paul D. LeVan; Ashok K. Sood; Priyalal Wijewarnasuriya; Arvind I. D'Souza, Editor(s)

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