Enhanced optical response in doubly waveguided plasmonic gratings

Xinping Zhang; Shengfei Feng; Hongmei Liu; Li Wang
September 2008
Applied Physics Letters;9/1/2008, Vol. 93 Issue 9, p093113
Academic Journal
A waveguide fabricated on top of a bottom-waveguided gold-nanowire grating device excites additional resonance modes through interaction between the two waveguides, which overlaps the “intrinsic” resonance mode of the bottom waveguide. Thus, the TE polarized (parallel to the gold nanowires) waveguide mode and TM polarized (perpendicular to the nanowires) coupled mode between the waveguide mode and the particle plasmon resonance of the gold nanowires are enhanced significantly in a tunable spectral band. The top waveguide also extends considerably the spectral tuning range of this optical filter device.


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