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Hybridization-induced resonances with high-quality factor in a plasmonic chipscale ring-disk nanocavity

Zhang, Z; Yang, J; Han, Y; He, X; Huang, J; Chen, D; (2020) Hybridization-induced resonances with high-quality factor in a plasmonic chipscale ring-disk nanocavity. Waves in Random and Complex Media 10.1080/17455030.2020.1742401. (In press). Green open access

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Abstract

Plasmonic resonators have drawn more attention due to the ability to confine light into subwavelength scale. However, they always suffer from a low-quality (Q) factor owing to the intrinsic loss of metal. Here, we numerically propose a plasmonic resonator with ultra-high Q factor based on plasmonic metal–insulator-metal (MIM) waveguide structures. The resonator consists of a disk cavity surrounded by a concentric ring cavity, possessing an ultra-small volume. Arising from the plasmon hybridization between plasmon modes in the disk and ring cavity, the induced bonding hybridized modes have an ultra-narrow full width at half maximum (FWHM) as well as ultra-high Q factors. The FWHM can be nearly 1 nm and Q factor can be more than 400. Furthermore, such a device can act as a refractive index sensor with an ultra-high figure of merit (FOM). This work provides a novel approach to design plasmonic high-Q-factor resonators and has potential on-chip applications such as filters, multi-spectral sensors and nanolasers.

Type: Article
Title: Hybridization-induced resonances with high-quality factor in a plasmonic chipscale ring-disk nanocavity
Open access status: An open access version is available from UCL Discovery
DOI: 10.1080/17455030.2020.1742401
Publisher version: https://doi.org/10.1080/17455030.2020.1742401
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Metal–insulator-metal waveguide, plasmonic waveguide, plasmonic sensor, plasmonic resonator
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Engineering Science Faculty Office
URI: https://discovery.ucl.ac.uk/id/eprint/10095171
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