| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Pure Electric and Pure Magnetic Resonances in Near-Infrared Metal Double-Triangle Metamaterial Arrays |
| CAO Zhi-Shen, PAN Jian, CHEN Zhuo, ZHAN Peng , MIN Nai-Ben, WANG Zhen-Lin**
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National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093
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| Cite this article: |
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CAO Zhi-Shen, PAN Jian, CHEN Zhuo et al 2011 Chin. Phys. Lett. 28 057302 |
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Abstract We experimentally and numerically investigate the optical properties of metamaterial arrays composed of double partially-overlapped metallic nanotriangles fabricated by an angle-resolved nanosphere lithography. We demonstrate that each double-triangle can be viewed as an artificial magnetic element analogous to the conventional metal split-ring-resonator. It is shown that under normal-incidence conditions, individual double-triangle can exhibit a strong local magnetic resonance, but the collective response of the metamaterial arrays is purely electric because magnetic resonances of the two double-triangles in a unit cell having opposite openings are out of phase. For oblique incidences the metamaterial arrays are shown to support a pure magnetic response at the same frequency band. Therefore, switchable electric and magnetic resonances are achieved in double-triangle arrays. Moreover, both the electric and magnetic resonances are shown to allow for a tunability over a large spectral range down to near-infrared.
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| Keywords:
73.20.Mf
78.67.-n
81.16.-c
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Received: 17 March 2011
Published: 26 April 2011
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| PACS: |
73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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78.67.-n
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(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
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81.16.-c
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(Methods of micro- and nanofabrication and processing)
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