Hybrid Semiconductor Nanowire鈥揗etallic Yagi-Uda Antennas

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• 作者：Mohammad Ramezani ; Alberto Casadei ; Grzegorz Grzela ; Federico Matteini ; G枚zde T眉t眉nc眉oglu ; Daniel R眉ffer ; Anna Fontcuberta i Morral ; Jaime G贸mez Rivas
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：August 12, 2015
• 年：2015
• 卷：15
• 期：8
• 页码：4889-4895
• 全文大小：386K
• ISSN：1530-6992

文摘

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 objective. The precise tuning of the dimensions of the metallic elements of the nanoantenna leads to a strong variation of the directionality of the emission, being able to change this emission from backward to forward. We explain the mechanism leading to this directional emission by finite difference time domain simulations of the scattering efficiency of the antenna elements. These results cast the first step toward the realization of electrically driven optical Yagi-Uda antenna emitters based on semiconductors nanowires.