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Opt Express. 2011 Sep 12;19(19):18072-9. doi: 10.1364/OE.19.018072.

Ultra-high extinction ratio micropolarizers using plasmonic lenses.

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  • 1Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA.


The design of a new type of plasmonic ultra-high extinction ratio micropolarizing transmission filter is presented along with an experimental demonstration. A pair of dielectric coated metal gratings couple incident TM polarized light into surface plasmons, which are fed into a central metal-insulator-metal (MIM) waveguide, followed by transmission through a sub-wavelength aperture. Extinction ratios exceeding 10ยนยน are predicted by finite element simulation. Good absolute agreement for both the spectral and polarization response is obtained between measurement and simulations using measured geometric parameters. The filters can be easily fabricated and sized to match the pixel pitch of current focal plane arrays.

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