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Compact and high-resolution plasmonic wavelength demultiplexers based on Fano interference
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13

Dec

2011

Jianjun Chen, Zhi Li, Jia Li, and Qihuang Gong

Optics Express, Vol. 19, Issue 10, pp. 9976-9985 (2011)


http://dx.doi.org/10.1364/OE.19.009976

Abstract

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 OSA

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