Wavelength-Converted/Selective Waveguiding Based on Composition-Graded Semiconductor Nanowires

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• 作者：Jinyou Xu ; Xiujuan Zhuang ; Pengfei Guo ; Qinglin Zhang ; Weiqing Huang ; Qiang Wan ; Wei Hu ; Xiaoxia Wang ; Xiaoli Zhu ; Changzeng Fan ; Zongyin Yang ; Limin Tong ; Xiangfeng Duan ; Anlian Pan
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：September 12, 2012
• 年：2012
• 卷：12
• 期：9
• 页码：5003-5007
• 全文大小：374K
• 年卷期：v.12,no.9(September 12, 2012)
• ISSN：1530-6992

文摘

Compact wavelength-sensitive optical components are desirable for optical information processing and communication in photonic integrated system. In this work, optical waveguiding along single composition-graded CdS_xSe_1-x nanowires were systematically investigated. Under a focused laser excitation, the excited light can be guided passively along the bandgap-increased direction of the nanowire, keeping the photonic energy of the guided light almost unchanged during the whole propagation. In comparison, the excited light is guided actively through incessantly repeated band-to-band reabsorption and re-emitting processes along the bandgap-decreased direction, resulting in a gradual wavelength conversion during propagation. On the basis of this wavelength-converted waveguiding, a concept of nanoscale wavelength splitter is demonstrated by assembling a graded nanowire with several composition-uniform nanowires into branched nanowire structure. Our study indicates that composition-graded semiconductor nanowires would open new exciting opportunities in developing new wavelength-sensitive optical components for integrated nanophotonic devices.

Keywords:

Semiconductor nanowires; waveguiding; wavelength-selective; information devices; composition-graded