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Optical Engineering

Modified tapered interface for efficient coupling between inner and surface photonic crystal waveguides
Author(s): Si Zhong Li; Tian Bao Yu; Nianhua Liu; Tongbiao Wang; Xuming Xu; Qinghua Liao
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Paper Abstract

Efficient coupling into inner photonic crystal waveguides (IPCW) is critical to the applications of PC in photonic integrated circuits. This paper discusses the highly efficient coupling from surface PCWs into IPCW based on all-PC structures by a modified taper at the interface. The introduction of the modified taper is aimed to compress gradually the extended field propagating at the surface as well as excite the surface mode at the modified oblique surface. Good matching of modal field profiles on the both sides of the interface is achieved by keeping the waveguide structures changeless. The numerical results based on finite-difference time-domain simulations show that the bandwidth for coupling efficiency >90% can be as broad as about 80 nm.

Paper Details

Date Published: 25 February 2014
PDF: 5 pages
Opt. Eng. 53(2) 027104 doi: 10.1117/1.OE.53.2.027104
Published in: Optical Engineering Volume 53, Issue 2
Show Author Affiliations
Si Zhong Li, Nanchang Univ. (China)
Tian Bao Yu, Nanchang Univ. (China)
Nianhua Liu, Nanchang Univ. (China)
Tongbiao Wang, Nanchang Univ. (China)
Xuming Xu, Nanchang Univ. (China)
Qinghua Liao, Nanchang Univ. (China)

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