25 February 2014 Modified tapered interface for efficient coupling between inner and surface photonic crystal waveguides
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Optical Engineering, 53(2), 027104 (2014). doi: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.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Si Zhong Li, Tian Bao Yu, Nianhua Liu, Tongbiao Wang, Xuming Xu, Qinghua Liao, "Modified tapered interface for efficient coupling between inner and surface photonic crystal waveguides," Optical Engineering 53(2), 027104 (25 February 2014). http://dx.doi.org/10.1117/1.OE.53.2.027104
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KEYWORDS
Interfaces

Waveguides

Photonic crystals

Wave propagation

Finite-difference time-domain method

Photonic integrated circuits

Dielectrics

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