Ultrasmall Plasmonic Cavity for Chemical Sensing |
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Authors: | Soon-Hong Kwon |
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Affiliation: | 1. Department of Physics, Chung-Ang University, Seoul, 156-756, South Korea
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Abstract: | We propose an ultrasmall plasmonic cavity based on the channel waveguides for chemical sensing. The plasmonic mode gap due to cutoff angular frequency enables strong optical confinement in a subwavelength volume and suppression of radiation loss. Due to strong field overlap of the surface plasmon polariton mode with environmental material, large sensitivity (1,100 nm/refractive index unit) and a high figure of merit (330) are achieved in the plasmonic cavity with a small physical size of 600?×?800?×?2,500 nm having a telecommunication resonant wavelength. This plasmonic cavity can introduce a broad range of applications including biochemical sensing and strong light–matter interactions. |
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