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We propose a hybrid cavity-channel structure to tune optical wavelengths using narrow-band resonances. High spectral selectivity and high angular dependency of the absorptance are reported due to the resonance between propagating surface plasmon modes and channel modes. By varying the incident angle, we could adjust both the position and the amplitude of the reflectance dips thus achieving highly...
We report conditions for light trapping in subwavelength metallic U-shaped cavities. Full and partial light trapping exhibiting optical power flow vortices originate in coupling of surface plasmons into cavity modes. Localized surface plasmons coupled into cavity modes realize full light trapping, whereas propagating surface plasmons coupled into cavity modes result in partial light trapping. For...
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