Low group velocity in a photonic crystal coupled-cavity waveguide

doi:10.1088/1674-1056/21/4/044213

Abstract A two-dimensional photonic crystal coupled-cavity waveguide is designed and optimized, the transmission spectrum is calculated by using the finite-difference time-domain method, and the group velocity of c/1856 is obtained. To our knowledge, this value of group velocity is the lowest group velocity in a photonic crystal waveguide calculated from its transmission spectrum so far. The result is confirmed by the photonic band structure calculated by using the plane wave expansion method, and it is found that the photonic crystal waveguide modes in a photonic band structure are in accordance with those in the transmission spectrum by using the finite-difference time-domain method. The mechanism of slow light in the coupled-cavity waveguide of photonic crystal is analysed.

Keywords: photonic crystal wavguide coupled cavity slow light

Received: 26 July 2011
Revised: 03 November 2011
Accepted manuscript online:

PACS:	42.70.Qs	(Photonic bandgap materials)
	42.79.Gn	(Optical waveguides and couplers)
	42.60.Da	(Resonators, cavities, amplifiers, arrays, and rings)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60877030), the National High Technology Research and Development Program of China (Grant No. 2009AA03Z406), the Program of Visiting Professor for Senior International Scientists of the Chinese Academy of Sciences (Grant No. 2009G2-17), and the Science and Technology Program of Guangdong Province, China (Grant No. 2010B080701066).

Corresponding Authors: Xu Xing-Sheng,xsxu@ustc.edu
E-mail: xsxu@ustc.edu

Cite this article:

Zhang Chang-Xin(张昌莘) and Xu Xing-Sheng(许兴胜) Low group velocity in a photonic crystal coupled-cavity waveguide 2012 Chin. Phys. B 21 044213

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