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Plasmonic antenna array at optical frequency made by nanoapertures

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8 Author(s)
Zhang, Z.J. ; National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, People''s Republic of China ; Peng, R.W. ; Wang, Z. ; Gao, F.
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We show here that the plasmonic array based on nanoapertures in ultrathin silver film radiates at optical frequency and behaves as an optical antenna array (OAA). The far-field radiation originates from the coherent superposition of plasmonic emissions on each bank of the aperture. The radiation of OAA presents a strong directivity, which depends on the in-plane rotation of aperture array, and on the polarization and incidence angle of the excitation light as well. We suggest that these features have potential applications in photovoltaics, light-emitting devices, and optical sensors.

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Applied Physics Letters  (Volume:93 ,  Issue: 17 )