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Proceedings Paper

Plasmonic micropolarizers for full Stokes vector imaging
Author(s): J. J. Peltzer; K. A. Bachman; J. W. Rose; P. D. Flammer; T. E. Furtak; R. T. Collins; R. E. Hollingsworth
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Paper Abstract

Polarimetric imaging using micropolarizers integrated on focal plane arrays has previously been limited to the linear components of the Stokes vector because of the lack of an effective structure with selectivity to circular polarization. We discuss a plasmonic micropolarizing filter that can be tuned for linear or circular polarization as well as wavelength selectivity from blue to infrared (IR) through simple changes in its horizontal geometry. The filter consists of a patterned metal film with an aperture in a central cavity that is surrounded by gratings that couple to incoming light. The aperture and gratings are covered with a transparent dielectric layer to form a surface plasmon slab waveguide. A metal cap covers the aperture and forms a metal-insulator-metal (MIM) waveguide. Structures with linear apertures and gratings provide sensitivity to linear polarization, while structures with circular apertures and spiral gratings give circular polarization selectivity. Plasmonic TM modes are transmitted down the MIM waveguide while the TE modes are cut off due to the sub-wavelength dielectric thickness, providing the potential for extremely high extinction ratios. Experimental results are presented for micropolarizers fabricated on glass or directly into the Ohmic contact metallization of silicon photodiodes. Extinction ratios for linear polarization larger than 3000 have been measured.

Paper Details

Date Published: 8 June 2012
PDF: 12 pages
Proc. SPIE 8364, Polarization: Measurement, Analysis, and Remote Sensing X, 83640O (8 June 2012); doi: 10.1117/12.919324
Show Author Affiliations
J. J. Peltzer, Colorado School of Mines (United States)
K. A. Bachman, Colorado School of Mines (United States)
J. W. Rose, Colorado School of Mines (United States)
P. D. Flammer, Colorado School of Mines (United States)
T. E. Furtak, Colorado School of Mines (United States)
R. T. Collins, Colorado School of Mines (United States)
R. E. Hollingsworth, ITN Energy Systems, Inc. (United States)


Published in SPIE Proceedings Vol. 8364:
Polarization: Measurement, Analysis, and Remote Sensing X
David B. Chenault; Dennis H. Goldstein, Editor(s)

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