期刊
OPTICS EXPRESS
卷 20, 期 20, 页码 22233-22244出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.20.022233
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- Louisiana Board of Regents [LEQSF(2009-12)-RD-A-08, LEQSF-EPS(2012)-PFUND-281]
- National Science Foundation [1102301]
We introduce compact wavelength-scale slit-based structures for coupling free space light into metal-dielectric-metal (MDM) subwavelength plasmonic waveguides. We first show that for a single slit structure the coupling efficiency is limited by a trade-off between the light power coupled into the slit, and the transmission of the slit-MDM waveguide junction. We next consider a two-section slit structure, and show that for such a structure the upper slit section enhances the coupling of the incident light into the lower slit section. The optimized two-section slit structure results in similar to 2.3 times enhancement of the coupling into the MDM plasmonic waveguide compared to the optimized single-slit structure. We finally consider a symmetric double-slit structure, and show that for such a structure the surface plasmons excited at the metal-air interfaces are partially coupled into the slits. Thus, the coupling of the incident light into the slits is greatly enhanced, and the optimized double-slit structure results in similar to 3.3 times coupling enhancement compared to the optimized single-slit structure. In all cases the coupler response is broadband. (C) 2012 Optical Society of America
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