Controllable optical Bloch oscillation in planar graded optical waveguide arrays
Publication in refereed journal

香港中文大學研究人員

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摘要Optical Bloch oscillation is studied theoretically in planar graded optical waveguide arrays with nearest-neighbor couplings. The gradient in the propagation constants can be achieved with the eletro-optical effect. We identify a variety of normal modes (called gradons) in the waveguide arrays with the aid of a phase diagram. Moreover, the localization properties of the normal modes are characterized and the transitions among these modes are obtained from a picture of overlapping bands. The existence of Bloch oscillation and other oscillations are confirmed by using the field-evolution analysis with various input Gaussian beams. From the results, we obtain a correspondence between gradon localization and Bloch oscillation. This study can be extended to more general waveguide arrays in higher dimensions and with further neighbor couplings. The results offer great potential applications in controlling wave propagation by means of graded materials and graded systems, which can be used to explore the tunability of light manipulation and applied to design suitable optical devices.
著者Zheng MJ, Xiao JJ, Yu KW
期刊名稱Physical Review A
出版年份2010
月份3
日期1
卷號81
期次3
出版社American Physical Society
國際標準期刊號1050-2947
電子國際標準期刊號1094-1622
語言英式英語
Web of Science 學科類別Optics; OPTICS; Physics; Physics, Atomic, Molecular & Chemical; PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

上次更新時間 2021-02-03 於 23:51