Anisotropic impedance surfaces activated by incident waveform
Anisotropic impedance surfaces have been used to control surface wave propagation, which has benefited applications across a variety of fields including radio-frequency (RF) and optical devices, sensing, electromagnetic compatibility, wireless power transfer, and communications. However, the respons...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2022-02-01
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| Series: | Nanophotonics |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/nanoph-2021-0659 |
| _version_ | 1797947919706357760 |
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| author | Homma Haruki Akram Muhammad Rizwan Fathnan Ashif Aminulloh Lee Jiyeon Christopoulos Christos Wakatsuchi Hiroki |
| author_facet | Homma Haruki Akram Muhammad Rizwan Fathnan Ashif Aminulloh Lee Jiyeon Christopoulos Christos Wakatsuchi Hiroki |
| author_sort | Homma Haruki |
| collection | DOAJ |
| description | Anisotropic impedance surfaces have been used to control surface wave propagation, which has benefited applications across a variety of fields including radio-frequency (RF) and optical devices, sensing, electromagnetic compatibility, wireless power transfer, and communications. However, the responses of these surfaces are fixed once they are fabricated. Although tunable impedance surfaces have been introduced by utilizing power-dependent nonlinear components, such a tuning mechanism is generally limited to specific applications. Here we propose an additional mechanism to achieve tunable anisotropic impedance surfaces by embedding transient circuits that are controllable via the type of incident waveform. By switching between the open and short states of the circuits, it is possible to separately control the unit-cell impedances in two orthogonal directions, thereby changing from an isotropic impedance surface to an anisotropic impedance surface. Our simulation results show that a short pulse strongly propagates for both x and y directions at 3 GHz. However, when the waveform changes to a continuous wave, the transmittance for x direction is reduced to 26%, although still the transmittance for y direction achieves 77%. Therefore, the proposed metasurfaces are capable of guiding a surface wave in a specific direction based on the incident waveform even with the same power level and at the same frequency. Our study paves new avenues regarding the use of surface wave control in applications ranging from wireless communications to sensing and cloaking devices. |
| first_indexed | 2024-04-10T21:35:17Z |
| format | Article |
| id | doaj.art-c1a03719befd421eb61c025bae4c61a7 |
| institution | Directory Open Access Journal |
| issn | 2192-8614 |
| language | English |
| last_indexed | 2024-04-10T21:35:17Z |
| publishDate | 2022-02-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj.art-c1a03719befd421eb61c025bae4c61a72023-01-19T12:46:59ZengDe GruyterNanophotonics2192-86142022-02-011191989200010.1515/nanoph-2021-0659Anisotropic impedance surfaces activated by incident waveformHomma Haruki0Akram Muhammad Rizwan1Fathnan Ashif Aminulloh2Lee Jiyeon3Christopoulos Christos4Wakatsuchi Hiroki5Department of Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya, Aichi, 466-8555, JapanDepartment of Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya, Aichi, 466-8555, JapanDepartment of Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya, Aichi, 466-8555, JapanElectrical and Computer Engineering Department, University of California San Diego, La Jolla, CA, 92093, USAThe George Green Institute of Electromagnetics Research, Department of Electrical and Electronic Engineering, University of Nottingham, Nottingham, NG7 2RD, UKDepartment of Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya, Aichi, 466-8555, JapanAnisotropic impedance surfaces have been used to control surface wave propagation, which has benefited applications across a variety of fields including radio-frequency (RF) and optical devices, sensing, electromagnetic compatibility, wireless power transfer, and communications. However, the responses of these surfaces are fixed once they are fabricated. Although tunable impedance surfaces have been introduced by utilizing power-dependent nonlinear components, such a tuning mechanism is generally limited to specific applications. Here we propose an additional mechanism to achieve tunable anisotropic impedance surfaces by embedding transient circuits that are controllable via the type of incident waveform. By switching between the open and short states of the circuits, it is possible to separately control the unit-cell impedances in two orthogonal directions, thereby changing from an isotropic impedance surface to an anisotropic impedance surface. Our simulation results show that a short pulse strongly propagates for both x and y directions at 3 GHz. However, when the waveform changes to a continuous wave, the transmittance for x direction is reduced to 26%, although still the transmittance for y direction achieves 77%. Therefore, the proposed metasurfaces are capable of guiding a surface wave in a specific direction based on the incident waveform even with the same power level and at the same frequency. Our study paves new avenues regarding the use of surface wave control in applications ranging from wireless communications to sensing and cloaking devices.https://doi.org/10.1515/nanoph-2021-0659anisotropic impedance surfacesnonlinear circuitpower dependencywaveform selectivity |
| spellingShingle | Homma Haruki Akram Muhammad Rizwan Fathnan Ashif Aminulloh Lee Jiyeon Christopoulos Christos Wakatsuchi Hiroki Anisotropic impedance surfaces activated by incident waveform Nanophotonics anisotropic impedance surfaces nonlinear circuit power dependency waveform selectivity |
| title | Anisotropic impedance surfaces activated by incident waveform |
| title_full | Anisotropic impedance surfaces activated by incident waveform |
| title_fullStr | Anisotropic impedance surfaces activated by incident waveform |
| title_full_unstemmed | Anisotropic impedance surfaces activated by incident waveform |
| title_short | Anisotropic impedance surfaces activated by incident waveform |
| title_sort | anisotropic impedance surfaces activated by incident waveform |
| topic | anisotropic impedance surfaces nonlinear circuit power dependency waveform selectivity |
| url | https://doi.org/10.1515/nanoph-2021-0659 |
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