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 language | English |
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Journal | Optical Society of America. Journal B: Optical Physics |
Volume | 27 |
Issue number | 9 |
Pages (from-to) | 1828-1832 |
ISSN | 0740-3224 |
DOIs | |
Publication status | Published - 2010 |