Superscattering-enhanced narrow band forward scattering antenna
We present a narrow band forward scattering optical antenna which is based on the excitation of distinctive whispering gallery modes（WGMs）. The antenna is composed of three coaxial cylinder layers： a dielectric layer is sandwiched between a metallic core and cladding. Owing to the destructive interf...
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| Published in | Chinese physics B Vol. 24; no. 10; pp. 191 - 194 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
01.10.2015
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1674-1056 2058-3834 1741-4199 |
| DOI | 10.1088/1674-1056/24/10/104202 |
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| Summary: | We present a narrow band forward scattering optical antenna which is based on the excitation of distinctive whispering gallery modes（WGMs）. The antenna is composed of three coaxial cylinder layers： a dielectric layer is sandwiched between a metallic core and cladding. Owing to the destructive interference between the scattering of the outer metallic cladding and the WGM in the backward direction, the power flow in the forward direction is increased. Simulation and analysis show that in proper geometry conditions, the cavity can be tuned into a superscattering state. At this state, both the zeroth and the first order of WGM are excited and contribute to the total scattering. It is shown that the power ratio（power towards backward divided by power towards forward） can be enhanced to about 27 times larger than that for a non-resonant position by the superscattering. Owing to the confinement of the cladding to WGMs, the wavelength range of effective forward scattering is considerably narrow（about 15 nm）. |
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| Bibliography: | Hu De-Jiao,Zhang Zhi-You, Du Jing-Lei（a） College of Physical Science and Technology, Sichuan University, Chengdu 610064, China b） High Energy Density Physics of the Ministry of Education Key Laboratory, Sichuan University, Chengdu 610064, China c） Sino-British Joint Materials Research Institute, Sichuan University, Chengdu 610064, China We present a narrow band forward scattering optical antenna which is based on the excitation of distinctive whispering gallery modes（WGMs）. The antenna is composed of three coaxial cylinder layers： a dielectric layer is sandwiched between a metallic core and cladding. Owing to the destructive interference between the scattering of the outer metallic cladding and the WGM in the backward direction, the power flow in the forward direction is increased. Simulation and analysis show that in proper geometry conditions, the cavity can be tuned into a superscattering state. At this state, both the zeroth and the first order of WGM are excited and contribute to the total scattering. It is shown that the power ratio（power towards backward divided by power towards forward） can be enhanced to about 27 times larger than that for a non-resonant position by the superscattering. Owing to the confinement of the cladding to WGMs, the wavelength range of effective forward scattering is considerably narrow（about 15 nm）. surface plasmons, optical antenna, directional scattering, Fano resonance 11-5639/O4 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
| ISSN: | 1674-1056 2058-3834 1741-4199 |
| DOI: | 10.1088/1674-1056/24/10/104202 |