Infrared polarizer based on direct coupling to surface-plasmon polaritons
Optics
2020-12-30 v2 Applied Physics
Instrumentation and Detectors
Abstract
We propose a new type of reflective polarizer based on polarization-dependent coupling to surface-plasmon polaritons (SPPs) from free space. This inexpensive polarizer is relatively narrowband but features an extinction ratio of up to 1000 with efficiency of up to 95% for the desired polarization (numbers from a calculation), and thus can be stacked to achieve extinction ratios of 106 or more. As a proof of concept, we experimentally realized a polarizer based on nanoporous aluminum oxide that operates around a wavelength of 10.6 um, corresponding to the output of a CO2 laser, using aluminum anodization, a low-cost electrochemical process.
Cite
@article{arxiv.2006.09249,
title = {Infrared polarizer based on direct coupling to surface-plasmon polaritons},
author = {A. Shahsafi and J. Salman and B. E. Rubio Perez and Y. Xiao and C. Wan and M. A. Kats},
journal= {arXiv preprint arXiv:2006.09249},
year = {2020}
}
Comments
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