Refractive Index Sensing Properties of Metal–Dielectric Yurt Tetramer Metasurface | #Sciencefather #ResearcherAwards



Introduction

The advancement of optical sensing technologies has been significantly propelled by the development of metasurfaces, particularly metal–dielectric hybrid structures. Among them, the metal–dielectric hybrid tetramer metasurface has garnered widespread attention for its exceptional refractive index sensing capabilities. However, despite its potential, challenges remain in achieving a balance between a high Q-factor, polarization insensitivity, and multi-band tunability across visible to near-infrared spectra. To address these issues, the proposed metal–dielectric yurt tetramer metasurface introduces an innovative approach that enhances light–matter interactions through structural optimization and controlled perturbation, paving the way for ultra-sensitive refractive index detection.

Design and Simulation Methodology

The design of the metal–dielectric yurt tetramer metasurface is based on an intricate arrangement that combines metallic and dielectric components to manipulate optical resonances effectively. The finite-difference time-domain (FDTD) method was employed to simulate and analyze the optical response, offering precise insights into the resonance behavior under various environmental and structural conditions. Through careful tuning of design parameters such as lattice spacing, dielectric thickness, and nanoparticle dimensions, the metasurface demonstrates superior control over resonance modes and field enhancement.

Resonance Mechanism Analysis

A detailed investigation of the resonance modes reveals that the yurt tetramer metasurface supports multiple resonance phenomena, including surface plasmon resonance (SPR) and Fano resonance. By introducing deliberate structural perturbations, three distinct resonance modes are excited at wavelengths of 737.43 nm, 808.99 nm, and 939.50 nm. These resonances result from the interference between bright and dark modes, enhancing the electromagnetic field localization and significantly boosting sensing performance.

Optimization of Structural Parameters

The optimization of geometrical parameters plays a crucial role in determining the sensing efficiency of the metasurface. By systematically varying parameters such as the height, radius, and periodicity of the yurt structure, optimal conditions were achieved that maximize the Q-factor and refractive index sensitivity. The optimized configuration leads to an impressive Q-factor of 793.13, a FOM of 491.12 RIU−1, and a sensitivity of 500.94 nm/RIU, making the metasurface highly competitive among state-of-the-art optical sensors.

Influence of Polarization and Environmental Conditions

One of the key advantages of the proposed yurt tetramer metasurface is its polarization insensitivity, which ensures stable performance regardless of the polarization direction of the incident light. Additionally, the metasurface maintains high sensing accuracy under varying environmental refractive indices, showcasing robustness and adaptability. Such characteristics are particularly valuable for practical sensing applications in biochemical and environmental monitoring.

Applications and Future Prospects

The demonstrated metal–dielectric yurt tetramer metasurface provides a promising theoretical foundation for developing high-performance refractive index sensors. With its ultra-narrow linewidth (FWHM of 1.02 nm), high Q-factor, and broad spectral tunability, this design holds significant potential for applications in biochemical detection, optical communication, and photonic integrated systems. Future research can focus on experimental validation, fabrication scalability, and integration into portable sensing devices to fully harness its capabilities in real-world environments.

Global Particle Physics Excellence Awards


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#Sciencefather, #Reseacherawards, #MetasurfaceSensing, #OpticalSensor, #RefractiveIndex, #MetalDielectricHybrid, #FanoResonance, #SurfacePlasmonResonance, #HighQFactor, #PolarizationInsensitive, #VisibleToNIR, #Nanophotonics, #PhotonicsResearch, #FiniteDifferenceTimeDomain, #SpectralTunability, #LightMatterInteraction, #OpticalMetamaterials, #PlasmonicSensing, #Biosensing, #NanostructureDesign, #OpticalEngineering, #AdvancedMaterials,

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