Please use this identifier to cite or link to this item: https://doi.org/10.29026/oea.2021.200088
Title: Ultra-high extinction-ratio light modulation by electrically tunable metasurface using dual epsilon-near-zero resonances
Authors: Nemati, Arash
Wang, Qian
Ang, Norman Soo Seng
Wang, Weide
Hong, Minghui 
Teng, Jinghua
Keywords: Barium strontium titanate (BST)
Electrically tunable
Epsilon-near-zero (ENZ)
Indium tin oxide (ITO)
Metasurface
Polarization-insensitive
Issue Date: 1-Jan-2021
Publisher: Chinese Academy of Sciences
Citation: Nemati, Arash, Wang, Qian, Ang, Norman Soo Seng, Wang, Weide, Hong, Minghui, Teng, Jinghua (2021-01-01). Ultra-high extinction-ratio light modulation by electrically tunable metasurface using dual epsilon-near-zero resonances. Opto-Electronic Advances 4 (7) : 200088. ScholarBank@NUS Repository. https://doi.org/10.29026/oea.2021.200088
Rights: Attribution 4.0 International
Abstract: 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. © The Author(s) 2021.
Source Title: Opto-Electronic Advances
URI: https://scholarbank.nus.edu.sg/handle/10635/233782
ISSN: 2096-4579
DOI: 10.29026/oea.2021.200088
Rights: Attribution 4.0 International
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