Observation of wide-angle impedance matching in terahertz photonic crystals

Reflection due to impedance mismatch at interfaces of different materials is undesired in many THz applications including THz communication, spectroscopy and imaging. In this work, we theoretically and experimentally demonstrate a type of THz photonic crystals exhibiting wide-angle impedance matchin...

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Bibliographic Details
Published in:New Journal of Physics
Main Authors: Shanshan Li, Yu Wang, Wenya Zhang, Weixin Lu, Bo Hou, Jie Luo, Yun Lai
Format: Article
Language:English
Published: IOP Publishing 2020-01-01
Subjects:
terahertz
impedance matching
photonic crystals
metamaterials
Online Access:https://doi.org/10.1088/1367-2630/ab7050
Description
Summary:Reflection due to impedance mismatch at interfaces of different materials is undesired in many THz applications including THz communication, spectroscopy and imaging. In this work, we theoretically and experimentally demonstrate a type of THz photonic crystals exhibiting wide-angle impedance matching property with free space. The reflection as well as the reflection-induced Fabry–Pérot resonances are efficiently suppressed in a relatively broad spectrum. A sample is fabricated using high-resistance silicon and polyethylene terephthalate films. By using THz time domain spectroscopy, we have clearly observed high transmittance and suppression of Fabry–Pérot resonances for a wide range of incident angles (0°–60°) and a relatively broad spectrum (0.26–0.55 THz) in both polarizations. Our work opens a general approach for improvement of transmission and imaging quality in THz spectroscopy.
ISSN:1367-2630

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