Reflective Terahertz Metasurfaces Based on Non-Volatile Phase Change Material for Switchable Manipulation Article Swipe

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Natsima Sakda , Ratchapak Chitaree , B. M. A. Rahman ·

YOU? · · 2022 · Open Access · · DOI: https://doi.org/10.3390/photonics9080508

Recently, metasurfaces have been investigated and exploited for various applications in the THz regime, including modulators and detectors. However, the responsive properties of the metasurface in THz stay fixed once the fabrication process is complete. This limitation can be modified when integrating the phase change material (PCM), whose states are switchable between crystalline and amorphous, into the metasurface structure. This characteristic of the PCM is appealing in achieving dynamic and customizable functionality. In this work, the reflective metasurface structure is designed as a hexagonal unit deposited on a polyimide substrate. The non-volatile PCM chosen for the numerical study is germanium antimony tellurium (GST). Our proposed phase change metasurface provides two resonant frequencies located at 1.72 and 2.70 THz, respectively; one of them shows a high contrast of reflectivity at almost 80%. The effects of geometrical parameters, incident angles, and polarization modes on the properties of the proposed structure are explored. Finally, the performances of the structure are evaluated in terms of the insertion loss and extinction ratio.

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Materials Science

Optoelectronics

Semiconductor Device Fabrication

$Refractive Index$

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Terahertz radiation Materials science Optoelectronics Fabrication Polarization (electrochemistry) Extinction ratio Tellurium Optics Germanium compounds Phase (matter) Refractive index Germanium Wavelength Physics Pathology Alternative medicine Medicine Quantum mechanics Physical chemistry Chemistry Metallurgy Silicon

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Type: article
Language: en
Landing Page: https://doi.org/10.3390/photonics9080508
PDF: https://www.mdpi.com/2304-6732/9/8/508/pdf?version=1658487524
OA Status: gold
Cited By: 6
References: 80
Related Works: 10
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DOI: https://doi.org/10.3390/photonics9080508

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Title: Reflective Terahertz Metasurfaces Based on Non-Volatile Phase Change Material for Switchable Manipulation

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Language: en

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Publication year: 2022

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Publication date: 2022-07-22

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Authors: Natsima Sakda, Ratchapak Chitaree, B. M. A. Rahman

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Landing page: https://doi.org/10.3390/photonics9080508

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Concepts: Terahertz radiation, Materials science, Optoelectronics, Fabrication, Polarization (electrochemistry), Extinction ratio, Tellurium, Optics, Germanium compounds, Phase (matter), Refractive index, Germanium, Wavelength, Physics, Pathology, Alternative medicine, Medicine, Quantum mechanics, Physical chemistry, Chemistry, Metallurgy, Silicon

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Cited by: 6

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