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Deep Subwavelength-Scale Metal–Insulator–Metal Plasmonic Disk Cavities for Refractive Index Sensors

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1 Author(s)
Soon-Hong Kwon ; Department of Physics, Chung-Ang University, Seoul, Korea

We propose an ultrasmall plasmonic cavity index sensor based on double metal disks, in which a plasmonic mode with a wavelength (λ0) of 1550 nm can be confined. By carefully reducing the radius (R) and gap thickness (t), the cavity can be reduced to a size of R = 744 nm and t = 20 nm, achieving a deep subwavelength-scale sensing volume of 0.0093 λ03, while keeping the same wavelength. The figure of merit of the index sensor has a maximum value of 80 with a high sensitivity (1160 nm per refractive index unit) and narrow linewidth (14.8 nm).

Published in:

IEEE Photonics Journal  (Volume:5 ,  Issue: 1 )