基于与表面等离激元极化激元直接耦合的红外偏振器。

Infrared Polarizer Based on Direct Coupling to Surface Plasmon Polaritons.

作者信息

Shahsafi Alireza, Salman Jad, Rubio Perez Bryan E, Xiao Yuzhe, Wan Chenghao, Kats Mikhail A

机构信息

Department of Electrical and Computer Engineering, University of Wisconsin-Madison, 1415 Engineering Dr., Madison, Wisconsin 53706, United States.

Department of Materials Science and Engineering, University of Wisconsin-Madison, 1509 University Ave, Madison, Wisconsin 53706, United States.

出版信息

Nano Lett. 2020 Dec 9;20(12):8483-8486. doi: 10.1021/acs.nanolett.0c02492. Epub 2020 Nov 16.

DOI:10.1021/acs.nanolett.0c02492

PMID:33197190

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 10 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 μm, corresponding to the output of a CO laser, using aluminum anodization, a low-cost electrochemical process.

摘要

我们提出了一种新型反射式偏振器，它基于自由空间中与表面等离激元极化激元（SPP）的偏振相关耦合。这种价格低廉的偏振器相对带宽较窄，但对于所需偏振态具有高达1000的消光比，且所需偏振态的效率高达95%（计算所得数据），因此可以堆叠以实现10或更高的消光比。作为概念验证，我们通过低成本的电化学阳极氧化工艺，实验实现了一种基于纳米多孔氧化铝的偏振器，其工作波长约为10.6μm，对应于CO激光器的输出波长。