منابع مشابه
Compact Nonlinear Yagi-Uda Nanoantennas
Nanoantennas have demonstrated unprecedented capabilities for manipulating the intensity and direction of light emission over a broad frequency range. The directional beam steering offered by nanoantennas has important applications in areas including microscopy, spectroscopy, quantum computing, and on-chip optical communication. Although both the physical principles and experimental realization...
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We demonstrate the directional emission of individual GaAs nanowires by coupling this emission to Yagi-Uda optical antennas. In particular, we have replaced the resonant metallic feed element of the nanoantenna by an individual nanowire and measured with the microscope the photoluminescence of the hybrid structure as a function of the emission angle by imaging the back focal plane of the object...
متن کاملActively tunable bistable optical Yagi-Uda nanoantenna.
We propose and theoretically demonstrate a novel type of optical Yagi-Uda nanoantennas tunable via variation of the free-carrier density of a semiconductor disk placed in a gap of a metallic dipole feeding element. Unlike its narrowband all-metal counterparts, this nanoantenna exhibits a broadband unidirectional emission and demonstrates a bistable response in a preferential direction of the fa...
متن کاملEvolutionary Optimization of Yagi-Uda Antennas
Yagi-Uda antennas are known to be difficult to design and optimize due to their sensitivity at high gain, and the inclusion of numerous parasitic elements. We present a genetic algorithm-based automated antenna optimization system that uses a fixed Yagi-Uda topology and a byte-encoded antenna representation. The fitness calculation allows the implicit relationship between power gain and sidelob...
متن کاملMembrane-supported Yagi-uda Millimeter-wave Antennas
This paper presents the design, fabrication and “on wafer” characterization of membrane-supported YagiUda CPW fed antenna structures. The antennas were designed for the 60 GHz and 77 GHz frequency operating ranges. The 60 GHz antennas were fabricated on a semi-insulating GaAs membrane using GaAs micromachining. The 77 GHz antennas were manufactured on 1.4 μm thin SiO2/Si3N4 membranes obtained b...
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ژورنال
عنوان ژورنال: British Dental Journal
سال: 2007
ISSN: 0007-0610,1476-5373
DOI: 10.1038/bdj.2007.283