Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 27, Issue 9, Pages 1828-1832Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.27.001828
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- Eurohorcs/ESF
- Danish Research Council for Technology and Production
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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%. (C) 2010 Optical Society of America
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