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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Institue of Optics and Electronics, Chinese Academy of Sciences
2021-07-01
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| Series: | Opto-Electronic Advances |
| Subjects: | |
| Online Access: | http://www.oejournal.org/article/doi/10.29026/oea.2021.200088 |
| _version_ | 1819007059849379840 |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-21T00:18:34Z |
| format | Article |
| id | doaj.art-1e7c8e5edee945cdbf72f356533d5fcf |
| institution | Directory Open Access Journal |
| issn | 2096-4579 |
| language | English |
| last_indexed | 2024-12-21T00:18:34Z |
| publishDate | 2021-07-01 |
| publisher | Institue of Optics and Electronics, Chinese Academy of Sciences |
| record_format | Article |
| series | Opto-Electronic Advances |
| spelling | doaj.art-1e7c8e5edee945cdbf72f356533d5fcf2022-12-21T19:22:08ZengInstitue of Optics and Electronics, Chinese Academy of SciencesOpto-Electronic Advances2096-45792021-07-014711110.29026/oea.2021.200088oea-2020-0088-TengjinghuaUltra-high extinction-ratio light modulation by electrically tunable metasurface using dual epsilon-near-zero resonancesArash Nemati0Qian Wang1Norman Soo Seng Ang2Weide Wang3Minghui Hong4Jinghua Teng5Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, SingaporeInstitute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, SingaporeInstitute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, SingaporeInstitute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, SingaporeDepartment of Electrical and Computer Engineering, National University of Singapore, Engineering Drive 3, Singapore 117576, SingaporeInstitute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, SingaporeThe 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.http://www.oejournal.org/article/doi/10.29026/oea.2021.200088metasurfaceelectrically tunableindium tin oxide (ito)epsilon-near-zero (enz)barium strontium titanate (bst)polarization-insensitive |
| spellingShingle | 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 Opto-Electronic Advances metasurface electrically tunable indium tin oxide (ito) epsilon-near-zero (enz) barium strontium titanate (bst) polarization-insensitive |
| title | 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_short | 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 |
| topic | metasurface electrically tunable indium tin oxide (ito) epsilon-near-zero (enz) barium strontium titanate (bst) polarization-insensitive |
| url | http://www.oejournal.org/article/doi/10.29026/oea.2021.200088 |
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