Topology optimization of grating couplers for the efficient excitation of surface plasmons

Jacob Anders Andkjær, Ole Sigmund, Shinji Nishiwaki, Tsuyoshi Nomura

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Abstract

We propose a methodology for a systematic design of grating couplers for efficient excitation of surface plasmons at metal-dielectric interfaces. The methodology is based on a two-dimensional topology optimization formulation based on the H-polarized scalar Helmholtz equation and finite-element method simulations. The efficiency of the method is demonstrated by optimized designs for input and output grating couplers for an Ag-SiO2 interface. The results indicate that slanted grove gratings may raise the coupling efficiency above 68% where the highest previously reported value was 50%.
Original languageEnglish
JournalOptical Society of America. Journal B: Optical Physics
Volume27
Issue number9
Pages (from-to)1828-1832
ISSN0740-3224
DOIs
Publication statusPublished - 2010

Bibliographical note

Copyright (2010) Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.

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