Journal
OPTICS COMMUNICATIONS
Volume 368, Issue -, Pages 197-201Publisher
ELSEVIER
DOI: 10.1016/j.optcom.2016.01.090
Keywords
Diffraction theory; Radial polarization; Subwavelength focusing
Categories
Funding
- National Natural Science Foundation of China [51275111]
- Program for New Century Excellent Talents in University [NECT100059]
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The divergence and directivity of a laser with a periodic Yagi-Uda optical antenna array modulated surface are investigated by finite element method. The nanoparticle optical antenna arrays are optimized to achieve the high directivity and the small divergence by using of Helmholtz's reciprocity theorem. When the nanoparticle antenna replaced by a Yagi-Uda antenna with same size, the directivity and the signal-to-noise ratio of the modulated laser beam are notably enhanced. The main reason is that the directors of the Yagi-Uda antennas induce more energy to propagate towards the antenna transmitting direction. The results can provide valuable guidelines in designing collimated laser, which can be widely applied in the field of biologic detection, spatial optical communication and optical measurement. (C) 2016 Elsevier B.V. All rights reserved.
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