Unidirectional broadband radiation of honeycomb plasmonic antenna array with broken symmetry
Tok, Rüştü Umut and Ow-Yang, Cleva W. and Şendur, Kürşat (2011) Unidirectional broadband radiation of honeycomb plasmonic antenna array with broken symmetry. Optics Express, 19 (23). pp. 22731-22742. ISSN 1094-4087
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Official URL: http://dx.doi.org/10.1364/OE.19.022731
Emerging plasmonic and photovoltaic applications benefit from effective interaction between optical antennas and unidirectional incident light over a wide spectrum. Here, we propose a honeycomb array of plasmonic nanoantennas with broken symmetry to obtain a unidirectional radiation pattern over a wide spectrum. The honeycomb nanoantenna array is based on a hexagonal grid with periodically arranged nanostructure building blocks. To analyze the far-field optical distribution and spectral behavior of the plasmonic antenna honeycomb, a two-dimensional Wigner-Seitz unit cell is used together with periodic boundary conditions. As a result of the vectoral superposition of the fields produced by the Wigner-Seitz unit cells, far-zone optical fields interfere constructively or destructively in different directions. The constructive interference along the array’s normal direction engenders unidirectional radiation. Due to the broken symmetry of the Wigner-Seitz cell, multiple resonances are supported by the plasmonic antenna honeycomb array over a broad spectrum.
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