All-Optical Logic Gates Based on Nanoscale Plasmonic Slot Waveguides

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• 作者：Yulan Fu ; Xiaoyong Hu ; Cuicui Lu ; Song Yue ; Hong Yang ; Qihuang Gong
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：November 14, 2012
• 年：2012
• 卷：12
• 期：11
• 页码：5784-5790
• 全文大小：401K
• 年卷期：v.12,no.11(November 14, 2012)
• ISSN：1530-6992

文摘

We report realizations of nanoscale integrated all-optical XNOR, XOR, NOT, and OR logic gates using plasmonic slot waveguides based on linear interference between surface plasmon polariton modes. The miniature device size with lateral dimensions smaller than 5 渭m, precisely controlled optical phase difference, and quasi-monochromatic surface plasmon polariton modes excited by a continuous wave 830 nm laser beam ensure a high intensity contrast ratio of 24 dB between the output logic states 鈥?鈥?and 鈥?鈥? Compared with previous reported results, the intensity contrast ratio is enhanced 4-fold, whereas the lateral dimension is reduced 4-fold. These compact logic devices are stable, robust, free from environmental impact, and much suitable for practical on-chip applications. These also provide a means to construct all-optical logic devices and nanophotonic processors.

Keywords:

Surface plasmon polaritons; all-optical logic gates; plasmonic slot waveguide; linear interference effect