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Fano resonance in the SWG-DBR metastructure
Optics Express
|July 2, 2026
Summary
This study presents a novel subwavelength grating (SWG) and distributed Bragg reflector (DBR) metastructure exhibiting Fano resonance. This toroidal dipole-dominated resonance shows sensitivity to refractive index changes, enabling potential applications in sensing and lasing.
Area of Science:
- Metamaterials and Nanophotonics
- Optical Spectroscopy and Resonance Phenomena
Background:
- Fano resonance arises from the coupling of continuum and discrete states.
- Metamaterials offer unique optical properties through engineered structures.
- Subwavelength gratings (SWG) and distributed Bragg reflectors (DBR) are key photonic components.
Purpose of the Study:
- To investigate Fano resonance in a vertically integrated SWG-DBR metastructure.
- To analyze the multipole contributions to the Fano resonance.
- To demonstrate the sensing capabilities of the metastructure based on refractive index changes.
Main Methods:
- Fabrication of a SWG-DBR metastructure.
- Simulation of reflection spectra under normal incidence.
- Multipole decomposition analysis.
- Experimental measurement of reflection spectra with varying ambient refractive indices.
Main Results:
- Observation of Fano resonance in the SWG-DBR metastructure's reflection spectrum.
- Verification that the Fano resonance is dominated by the toroidal dipole.
- Demonstration of a peak shift in Fano resonance due to changes in the interfacial refractive index.
- Experimental results consistent with simulations.
Conclusions:
- The SWG-DBR metastructure exhibits tunable Fano resonance.
- The toroidal dipole plays a dominant role in the observed resonance.
- The metastructure shows high sensitivity to refractive index variations, making it suitable for sensing applications.
- Potential applications include sensing, lasing, and polariton condensation.
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