Beyond Conventional Sensing: Hybrid Plasmonic Metasurfaces and Bound States in the Continuum

Fano resonances result from the strong coupling and interference between a broad background state and a narrow, almost discrete state, leading to the emergence of asymmetric scattering spectral profiles. Under certain conditions, Fano resonances can experience a collapse of their width due to the de...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2023-04, Vol.13 (7), p.1261
Main Authors: Bosomtwi, Dominic, Babicheva, Viktoriia E
Format: Article
Language:English
Subjects:
Analysis
Arrays
binary arrangement
Boundary conditions
Chemistry
Coupled modes
Coupling
Dielectric strength
Electric fields
Fano resonance
Fano resonances
Interference
Kerker effect
Materials Science
Metasurfaces
Methods
Nanoantennas
Nanoparticles
nanostructure
Physics
Plasmonics
Q factors
Rabi splitting
Resonance
Resonance scattering
Science & Technology - Other Topics
Sensors
Silicon
strong coupling
Tuning
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Summary:Fano resonances result from the strong coupling and interference between a broad background state and a narrow, almost discrete state, leading to the emergence of asymmetric scattering spectral profiles. Under certain conditions, Fano resonances can experience a collapse of their width due to the destructive interference of strongly coupled modes, resulting in the formation of bound states in the continuum (BIC). In such cases, the modes are simultaneously localized in the nanostructure and coexist with radiating waves, leading to an increase in the quality factor, which is virtually unlimited. In this work, we report on the design of a layered hybrid plasmonic-dielectric metasurface that facilitates strong mode coupling and the formation of BIC, resulting in resonances with a high quality factor. We demonstrate the possibility of controlling Fano resonances and tuning Rabi splitting using the nanoantenna dimensions. We also experimentally demonstrate the generalized Kerker effect in a binary arrangement of silicon nanodisks, which allows for the tuning of the collective modes and creates new photonic functionalities and improved sensing capabilities. Our findings have promising implications for developing plasmonic sensors that leverage strong light-matter interactions in hybrid metasurfaces.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano13071261