Mr. Feifei Hu reports a submicron plasmonic wavelength filtering/demultiplexing structure based on aperture-coupled slot cavities in the Journal of the Optical Society of America B, which can overcome the limitation by the field skin depth of ∼25nm in a conventional evanescent-coupling approach, and thus lead to an easy-to-fabricate device structure. In addition, the stub-induced interference arm has been introduced in the bus waveguide and drop waveguide, respectively, to significantly increase the transmission peak (about two times higher) and adjust the power ratio between two intrinsic resonance modes. Our results open a way to construct nanoscale wavelength filters and demultiplexers for high-density nanoplasmonic integration circuits.


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