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Opt Express. 2011 May 9;19(10):9976-85. doi: 10.1364/OE.19.009976.

Compact and high-resolution plasmonic wavelength demultiplexers based on Fano interference.

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  • 1State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China.


Using strong couplings of different Fabry-Perot (FP) resonators in metal-insulator-metal waveguides, a compact plasmonic wavelength demultiplexer is numerically demonstrated with high wavelength resolution. In the demultiplexer, it is found that new right-angle resonators emerge with bandwidth narrower than that of the isolated FP resonators. These narrowband right-angle resonators interfere with the broadband FP resonators, resulting in Fano-line shapes in the transmission spectra. Consequently, these sharp and asymmetric Fano-line shapes considerably increase the resolution of wavelength demultiplexing, which is significantly narrower than the full width of the isolated FP resonator.

© 2011 Optical Society of America

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