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Ultrathin tunable terahertz absorber based on MEMS-driven metamaterial
The realization of high-performance tunable absorbers for terahertz frequencies is crucial for advancing applications such as single-pixel imaging and spectroscopy. Based on the strong position sensitivity of metamaterials’ electromagnetic response, we combine meta-atoms that support strongly locali...
Autores principales: | , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6445006/ https://www.ncbi.nlm.nih.gov/pubmed/31057871 http://dx.doi.org/10.1038/micronano.2017.33 |
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author | Liu, Mingkai Susli, Mohamad Silva, Dilusha Putrino, Gino Kala, Hemendra Fan, Shuting Cole, Michael Faraone, Lorenzo Wallace, Vincent P. Padilla, Willie J. Powell, David A. Shadrivov, Ilya V. Martyniuk, Mariusz |
author_facet | Liu, Mingkai Susli, Mohamad Silva, Dilusha Putrino, Gino Kala, Hemendra Fan, Shuting Cole, Michael Faraone, Lorenzo Wallace, Vincent P. Padilla, Willie J. Powell, David A. Shadrivov, Ilya V. Martyniuk, Mariusz |
author_sort | Liu, Mingkai |
collection | PubMed |
description | The realization of high-performance tunable absorbers for terahertz frequencies is crucial for advancing applications such as single-pixel imaging and spectroscopy. Based on the strong position sensitivity of metamaterials’ electromagnetic response, we combine meta-atoms that support strongly localized modes with suspended flat membranes that can be driven electrostatically. This design maximizes the tunability range for small mechanical displacements of the membranes. We employ a micro-electro-mechanical system technology and successfully fabricate the devices. Our prototype devices are among the best-performing tunable THz absorbers demonstrated to date, with an ultrathin device thickness (~1/50 of the working wavelength), absorption varying between 60% and 80% in the initial state when the membranes remain suspended, and fast switching speed (~27 μs). The absorption is tuned by an applied voltage, with the most marked results achieved when the structure reaches the snap-down state. In this case, the resonance shifts by >200% of the linewidth (14% of the initial resonance frequency), and the absolute absorption modulation measured at the initial resonance can reach 65%. The demonstrated approach can be further optimized and extended to benefit numerous applications in THz technology. |
format | Online Article Text |
id | pubmed-6445006 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-64450062019-05-03 Ultrathin tunable terahertz absorber based on MEMS-driven metamaterial Liu, Mingkai Susli, Mohamad Silva, Dilusha Putrino, Gino Kala, Hemendra Fan, Shuting Cole, Michael Faraone, Lorenzo Wallace, Vincent P. Padilla, Willie J. Powell, David A. Shadrivov, Ilya V. Martyniuk, Mariusz Microsyst Nanoeng Article The realization of high-performance tunable absorbers for terahertz frequencies is crucial for advancing applications such as single-pixel imaging and spectroscopy. Based on the strong position sensitivity of metamaterials’ electromagnetic response, we combine meta-atoms that support strongly localized modes with suspended flat membranes that can be driven electrostatically. This design maximizes the tunability range for small mechanical displacements of the membranes. We employ a micro-electro-mechanical system technology and successfully fabricate the devices. Our prototype devices are among the best-performing tunable THz absorbers demonstrated to date, with an ultrathin device thickness (~1/50 of the working wavelength), absorption varying between 60% and 80% in the initial state when the membranes remain suspended, and fast switching speed (~27 μs). The absorption is tuned by an applied voltage, with the most marked results achieved when the structure reaches the snap-down state. In this case, the resonance shifts by >200% of the linewidth (14% of the initial resonance frequency), and the absolute absorption modulation measured at the initial resonance can reach 65%. The demonstrated approach can be further optimized and extended to benefit numerous applications in THz technology. Nature Publishing Group 2017-08-28 /pmc/articles/PMC6445006/ /pubmed/31057871 http://dx.doi.org/10.1038/micronano.2017.33 Text en Copyright © 2017 The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Liu, Mingkai Susli, Mohamad Silva, Dilusha Putrino, Gino Kala, Hemendra Fan, Shuting Cole, Michael Faraone, Lorenzo Wallace, Vincent P. Padilla, Willie J. Powell, David A. Shadrivov, Ilya V. Martyniuk, Mariusz Ultrathin tunable terahertz absorber based on MEMS-driven metamaterial |
title | Ultrathin tunable terahertz absorber based on MEMS-driven metamaterial |
title_full | Ultrathin tunable terahertz absorber based on MEMS-driven metamaterial |
title_fullStr | Ultrathin tunable terahertz absorber based on MEMS-driven metamaterial |
title_full_unstemmed | Ultrathin tunable terahertz absorber based on MEMS-driven metamaterial |
title_short | Ultrathin tunable terahertz absorber based on MEMS-driven metamaterial |
title_sort | ultrathin tunable terahertz absorber based on mems-driven metamaterial |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6445006/ https://www.ncbi.nlm.nih.gov/pubmed/31057871 http://dx.doi.org/10.1038/micronano.2017.33 |
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