期刊
NANOPHOTONICS
卷 1, 期 1, 页码 65-81出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2012-0005
关键词
Optical nanoantennas; Yagi-Uda antennas; all-dielectric nanoantennas; plasmonics; nanoparticles; spectral tuning; Purcell factor
资金
- Australian Research Council
- Australian National Fabrication Facility (ACT node)
Conventional antennas, which are widely employed to transmit radio and TV signals, can be used at optical frequencies as long as they are shrunk to nanometer-size dimensions. Optical nanoantennas made of metallic or high-permittivity dielectric nanoparticles allow for enhancing and manipulating light on the scale much smaller than wavelength of light. Based on this ability, optical nanoantennas offer unique opportunities regarding key applications such as optical communications, photovoltaics, nonclassical light emission, and sensing. From a multitude of suggested nanoantenna concepts the Yagi-Uda nanoantenna, an optical analogue of the well-established radio-frequency Yagi-Uda antenna, stands out by its efficient unidirectional light emission and enhancement. Following a brief introduction to the emerging field of optical nanoantennas, here we review recent theoretical and experimental activities on optical Yagi-Uda nanoantennas, including their design, fabrication, and applications. We also discuss several extensions of the conventional Yagi-Uda antenna design for broadband and tunable operation, for applications in nano-photonic circuits and photovoltaic devices.
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