Chin. Phys. Lett.  2011, Vol. 28 Issue (5): 057302    DOI: 10.1088/0256-307X/28/5/057302
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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**
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093
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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.
Keywords: 73.20.Mf      78.67.-n      81.16.-c     
Received: 17 March 2011      Published: 26 April 2011
PACS:  73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))  
  78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)  
  81.16.-c (Methods of micro- and nanofabrication and processing)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/28/5/057302       OR      https://cpl.iphy.ac.cn/Y2011/V28/I5/057302
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CAO Zhi-Shen
PAN Jian
CHEN Zhuo
ZHAN Peng
MIN Nai-Ben
WANG Zhen-Lin
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