Modified tapered interface for efficient coupling between inner and surface photonic crystal waveguides

Si Zhong Li; Tian Bao Yu; Nianhua Liu; Tongbiao Wang; Xuming Xu; Qinghua Liao

doi:10.1117/1.OE.53.2.027104

25 February 2014 Modified tapered interface for efficient coupling between inner and surface photonic crystal waveguides

Si Zhong Li, Tian Bao Yu, Nianhua Liu, Tongbiao Wang, Xuming Xu, Qinghua Liao

Author Affiliations +

Optical Engineering, Vol. 53, Issue 2, 027104 (February 2014). https://doi.org/10.1117/1.OE.53.2.027104

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.

Citation Download Citation

Si Zhong Li, Tian Bao Yu, Nianhua Liu, Tongbiao Wang, Xuming Xu, and Qinghua Liao "Modified tapered interface for efficient coupling between inner and surface photonic crystal waveguides," Optical Engineering 53(2), 027104 (25 February 2014). https://doi.org/10.1117/1.OE.53.2.027104

Published: 25 February 2014

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