Ultra-high extinction-ratio light modulation by electrically tunable metasurface using dual epsilon-near-zero resonances

The lossy nature of indium tin oxide (ITO) at epsilon-near-zero (ENZ) wavelength is used to design an electrically tunable metasurface absorber. The metasurface unit cell is constructed of a circular resonator comprising two ITO discs and a high dielectric constant perovskite barium strontium titana...

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Autores principales:	Arash Nemati, Qian Wang, Norman Soo Seng Ang, Weide Wang, Minghui Hong, Jinghua Teng
Formato:	article
Lenguaje:	EN
Publicado:	Institue of Optics and Electronics, Chinese Academy of Sciences 2021
Materias:	metasurface electrically tunable indium tin oxide (ito) epsilon-near-zero (enz) barium strontium titanate (bst) polarization-insensitive Optics. Light QC350-467
Acceso en línea:	https://doaj.org/article/1e7c8e5edee945cdbf72f356533d5fcf
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spelling	oai:doaj.org-article:1e7c8e5edee945cdbf72f356533d5fcf2021-11-17T07:55:51ZUltra-high extinction-ratio light modulation by electrically tunable metasurface using dual epsilon-near-zero resonances2096-457910.29026/oea.2021.200088https://doaj.org/article/1e7c8e5edee945cdbf72f356533d5fcf2021-07-01T00:00:00Zhttp://www.oejournal.org/article/doi/10.29026/oea.2021.200088https://doaj.org/toc/2096-4579The lossy nature of indium tin oxide (ITO) at epsilon-near-zero (ENZ) wavelength is used to design an electrically tunable metasurface absorber. The metasurface unit cell is constructed of a circular resonator comprising two ITO discs and a high dielectric constant perovskite barium strontium titanate (BST) film. The ENZ wavelength in the accumulation and depletion layers of ITO discs is controlled by applying a single bias voltage. The coupling of magnetic dipole resonance with the ENZ wavelength inside the accumulation layer of ITO film causes total absorption of reflected light. The reflection amplitude can achieve ~84 dB or ~99.99% modulation depth in the operation wavelength of 820 nm at a bias voltage of −2.5 V. Moreover, the metasurface is insensitive to the polarization of the incident light due to the circular design of resonators and the symmetrical design of bias connections.Arash NematiQian WangNorman Soo Seng AngWeide WangMinghui HongJinghua TengInstitue of Optics and Electronics, Chinese Academy of Sciencesarticlemetasurfaceelectrically tunableindium tin oxide (ito)epsilon-near-zero (enz)barium strontium titanate (bst)polarization-insensitiveOptics. LightQC350-467ENOpto-Electronic Advances, Vol 4, Iss 7, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	metasurface electrically tunable indium tin oxide (ito) epsilon-near-zero (enz) barium strontium titanate (bst) polarization-insensitive Optics. Light QC350-467
spellingShingle	metasurface electrically tunable indium tin oxide (ito) epsilon-near-zero (enz) barium strontium titanate (bst) polarization-insensitive Optics. Light QC350-467 Arash Nemati Qian Wang Norman Soo Seng Ang Weide Wang Minghui Hong Jinghua Teng Ultra-high extinction-ratio light modulation by electrically tunable metasurface using dual epsilon-near-zero resonances
description	The lossy nature of indium tin oxide (ITO) at epsilon-near-zero (ENZ) wavelength is used to design an electrically tunable metasurface absorber. The metasurface unit cell is constructed of a circular resonator comprising two ITO discs and a high dielectric constant perovskite barium strontium titanate (BST) film. The ENZ wavelength in the accumulation and depletion layers of ITO discs is controlled by applying a single bias voltage. The coupling of magnetic dipole resonance with the ENZ wavelength inside the accumulation layer of ITO film causes total absorption of reflected light. The reflection amplitude can achieve ~84 dB or ~99.99% modulation depth in the operation wavelength of 820 nm at a bias voltage of −2.5 V. Moreover, the metasurface is insensitive to the polarization of the incident light due to the circular design of resonators and the symmetrical design of bias connections.
format	article
author	Arash Nemati Qian Wang Norman Soo Seng Ang Weide Wang Minghui Hong Jinghua Teng
author_facet	Arash Nemati Qian Wang Norman Soo Seng Ang Weide Wang Minghui Hong Jinghua Teng
author_sort	Arash Nemati
title	Ultra-high extinction-ratio light modulation by electrically tunable metasurface using dual epsilon-near-zero resonances
title_short	Ultra-high extinction-ratio light modulation by electrically tunable metasurface using dual epsilon-near-zero resonances
title_full	Ultra-high extinction-ratio light modulation by electrically tunable metasurface using dual epsilon-near-zero resonances
title_fullStr	Ultra-high extinction-ratio light modulation by electrically tunable metasurface using dual epsilon-near-zero resonances
title_full_unstemmed	Ultra-high extinction-ratio light modulation by electrically tunable metasurface using dual epsilon-near-zero resonances
title_sort	ultra-high extinction-ratio light modulation by electrically tunable metasurface using dual epsilon-near-zero resonances
publisher	Institue of Optics and Electronics, Chinese Academy of Sciences
publishDate	2021
url	https://doaj.org/article/1e7c8e5edee945cdbf72f356533d5fcf
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Ultra-high extinction-ratio light modulation by electrically tunable metasurface using dual epsilon-near-zero resonances

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