Nanoscale Mode Selector in Silicon Waveguide for on Chip Nanofocusing Applications

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• 作者：Boris Desiatov ; Ilya Goykhman ; Uriel Levy
• 刊名：Nano Letters
• 出版年：2009
• 出版时间：October 14, 2009
• 年：2009
• 卷：9
• 期：10
• 页码：3381-3386
• 全文大小：302K
• 年卷期：v.9,no.10(October 14, 2009)
• ISSN：1530-6992

文摘

We demonstrate a nanoscale mode selector supporting the propagation of the first antisymmetric mode of a silicon waveguide. The mode selector is based on embedding a short section of PhC into the waveguide. On the basis of the difference in k-vector distribution between orthogonal waveguide modes, the PhC can be designed to have a band gap for the fundamental mode, while allowing the transmission of the first antisymmetric mode. The device was tested by directly measuring the modal content before and after the PhC section using a near field scanning optical microscope. Extinction ratio was estimated to be 23 dB. Finally, we provide numerical simulations demonstrating strong coupling of the antisymmetric mode to metallic nanotips. On the basis of the results, we believe that the mode selector may become an important building block in the realization of on chip nanofocusing devices.