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Updated: May 12, 2026

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

Published on: February 10, 2023

Multiple Fano resonances in single-layer nonconcentric core-shell nanostructures.

Jingjing Zhang¹, Anatoly Zayats

¹Department of Physics, King’s College London, Strand, London WC2R 2LS, UK. jingjing.zhang@kcl.ac.uk

|April 11, 2013

Summary

Researchers demonstrate multiple plasmonic Fano resonances in simple core-shell nanostructures. This occurs due to core offset, enabling advanced multiwavelength sensing applications.

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Area of Science:

Plasmonics and Nanophotonics
Optical Metamaterials
Nanoscale Optics

Background:

Multiple plasmonic Fano resonances typically necessitate complex multilayer nanostructures.
Coupling between dark and bright modes is crucial for Fano resonance.
Existing methods often require intricate designs for multiple Fano resonances.

Purpose of the Study:

To investigate the emergence of multiple Fano resonances in single-layer core-shell nanostructures.
To explore the influence of geometrical symmetry breaking on plasmonic properties.
To assess the potential for refractive index sensing using higher-order Fano resonances.

Main Methods:

Fabrication and characterization of single-layer dielectric-core-metal-shell (DCMS) and metal-core-dielectric-shell (MCDS) nanostructures.
Analytical modeling using transformation optics.
Numerical simulations to analyze optical properties and parameter dependencies.
Experimental validation of refractive index sensing capabilities.

Main Results:

Demonstrated multiple Fano resonances in single-layer core-shell nanostructures without complex multilayer designs.
Identified geometrical symmetry breaking, specifically axial core offset, as the mechanism for generating multiple dark modes.
Observed higher modulation depth in DCMS configurations compared to MCDS.
Confirmed the feasibility of multiwavelength refractive index sensing with a high figure of merit using higher-order Fano resonances.

Conclusions:

Single-layer core-shell nanostructures with an offset core can exhibit multiple plasmonic Fano resonances.
This design offers a simpler alternative to complex multilayer structures for achieving multiple Fano resonances.
The proposed nanostructures show significant potential for advanced multiwavelength sensing applications with high sensitivity.