title: Grating design for interlayer optical interconnection of in-plane waveguides.
abstract: Interlayer grating-to-grating optical interconnect coupling efficiency is simulated and optimized using rigorous coupled-wave analysis (RCWA) for the case of binary rectangular-groove gratings. The "equivalent index slab (EIS)" concept is proposed to alleviate the numerical sensitivity problem inherent in the RCWA-leaky-wave approach, making the method applicable to any multilayer structure that has an arbitrary grating profile, large refractive-index differences, and a limited grating length. The method is easy to implement and computationally efficient and can provide optimal designs based on the system designer's need. To determine the viability of the RCWA-EIS approach, results are compared to those obtained using the finite-difference time-domain method, and an excellent agreement is found.
authors.forename: Congshan
authors.initials: C
authors.lastname: Wan
authors.forename: Thomas K
authors.initials: TK
authors.lastname: Gaylord
authors.forename: Muhannad S
authors.initials: MS
authors.lastname: Bakir