Terahertz bandpass filter with Babinet complementary metamaterial mirrors and silicon subwavelength structure

Author:

Miyata Kasumi,Toyoshima Lisa,Iijima Kodai,Goto Yuka,Shohmitsu Yoshinori12,Wada Takehiko23,Nakaoka ToshihiroORCID

Affiliation:

1. High Energy Accelerator Research Organization (KEK)

2. Japan Aerospace Exploration Agency

3. National Astronomical Observatory of Japan

Abstract

We fabricated a rigid bandpass filter with a broad far-infrared wavelength range of high transmission using a silicon subwavelength structure with a Babinet complementary metamaterial half-mirror pair, despite its apparent light-blocking structure. The rigid one-piece filter was produced by a simple process involving photolithography, dry etching, and deposition, each performed only once. The transmission principle relies on the Fabry-Perot resonance with a metamaterial half-mirror pair that exhibits extraordinary optical transmission due to spoof surface plasmon polaritons. The transmission center wavelength was successfully predicted by the basic equation of Fabry-Perot resonance with an effective medium approximation. In contrast, a narrower bandwidth and a lower minimum transmittance than those predicted from the basic equation were provided by the subwavelength Si structure between the metamaterial mirrors, resulting in enhanced bandpass filter characteristics.

Funder

Budget for Basic R&D on onboard equipment for future space science missions by Advisory Committee for Space Science

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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