High-<i>Q</i>refractive index sensors based on all-dielectric metasurfaces

Wu, Pinghui; Qu, Shuangcao; Zeng, Xintao; Su, Ning; Chen, Musheng; Yu, Yanzhong

doi:10.1039/d2ra02176e

Cited by 18 publications

(6 citation statements)

References 67 publications

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“…To ensure that the simulation results of the designed metasurface yielded a sufficiently high sensitivity for refractive-index sensing in the visible and near-infrared spectral range, a comparison of sensitivities with previous studies in recent years and the proposed alldielectric metasurface is summarized in Table 7. The sensitivity of the designed all-dielectric metasurface was higher than that of the metasurfaces in the cited references [43,[60][61][62][63][64]. Notably, only two other metasurfaces using a dielectric hybrid disk [65] and an Si crescentshaped nanoparticle as the unit cells exhibited higher sensitivity than the proposed designed metasurface.…”

Section: Comparison Of Sensitivity With the Previous Study On Metasur...mentioning

confidence: 76%

Optimization of the Geometrical Design for an All-Dielectric Metasurface Sensor with a High Refractive-Index Response

Chang,

Yang,

Chen

et al. 2023

Chemosensors

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This study aims to develop a refractive-index sensor operating in the visible region using an all-dielectric metasurface, which was chosen for its advantages of low optical loss and narrow spectral bandwidth, compared to those of conventional metallic metasurfaces. COMSOL software was utilized as a calculation tool to simulate the resonant properties of an all-dielectric metasurface composed of a circular nanohole-structured titanium oxide (TiO2) thin film, with the aim of enhancing the sensitivity of the refractive index for sensing targets. The simulation focused on finding the best geometrical conditions for the all-dielectric metasurface to achieve high sensitivity. Two resonance modes observed in this metasurface were considered: the quasi-bound-state-in-the-continuum (qBIC) mode and the perfect-reflection (PR) mode. The simulated results demonstrated that high sensitivities of 257 nm/RIU at the PR mode and 94 nm/RIU at the qBIC mode in the visible spectral range could be obtained by periodically constructing the metasurface with a unit cell having a lattice constant of 350 nm, a nanohole radius of 160 nm, and a nanohole depth of 250 nm. Furthermore, the study showed that the resonance mode that enabled high sensitivity was the PR mode, with a sensitivity nearly three times larger than that of the qBIC mode and the ability to reach the highest reflectance at the resonance wavelength. The optimized feature had the highest reflectance at a resonant wavelength of 570.19 nm, and although the quality factor was 25.50, these designed parameters were considered sufficient for developing a refractive index biosensor with high sensitivity and optical efficiency when operating in the visible spectral range.

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Section: Comparison Of Sensitivity With the Previous Study On Metasur...mentioning

confidence: 76%

Optimization of the Geometrical Design for an All-Dielectric Metasurface Sensor with a High Refractive-Index Response

Chang,

Yang,

Chen

et al. 2023

Chemosensors

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“…A 2D-periodic TiO 2 dielectric grating structure with a guided mode is proposed as a high-sensitivity RI sensing device [ 140 ]. The improved nanosensing device can excite guided-mode resonance with an ultra-narrow linewidth of 0.19 nm, according to the results of numerical simulations.…”

Section: Types Of Ms-based Sensorsmentioning

confidence: 99%

“…Additionally, the device exhibits good tolerance for the angle of incident light and is insensitive to polarization. This shows that using low-loss all-dielectric MSs to produce ultra-sensitive biosensor detection is a good approach [ 140 ].…”

Section: Types Of Ms-based Sensorsmentioning

confidence: 99%

Recent Development in Metasurfaces: A Focus on Sensing Applications

2022

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One of the fastest-expanding study areas in optics over the past decade has been metasurfaces (MSs). These subwavelength meta-atom-based ultrathin arrays have been developed for a broad range of functions, including lenses, polarization control, holography, coloring, spectroscopy, sensors, and many more. They allow exact control of the many properties of electromagnetic waves. The performance of MSs has dramatically improved because of recent developments in nanofabrication methods, and this concept has developed to the point that it may be used in commercial applications. In this review, a vital topic of sensing has been considered and an up-to-date study has been carried out. Three different kinds of MS absorber sensor formations, all-dielectric, all-metallic, and hybrid configurations, are presented for biochemical sensing applications. We believe that this review paper will provide current knowledge on state-of-the-art sensing devices based on MSs.

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“…Mie resonance (TD mode) 15) 2022 Yes 470 (Sim.) -Guided-mode resonance 24) 2022 Yes 82 (Sim.) 433 (Sim.)…”

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Hollow Mie resonators based on toroidal magnetic dipole mode with enhanced sensitivity in refractometric sensing

Xu,

Takahara

2024

Appl. Phys. Express

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We propose a refractometric sensor based on hollow silicon Mie resonators of a toroidal magnetic dipole mode. This mode has a pair of antiparallel electric dipoles perpendicular to the silica substrate; thus, the radiation of the mode is suppressed, resulting in an ultra-narrow reflection peak linewidth of 0.35 nm. In addition, the hollow structure enhances the interaction between the enhanced electric field and the surrounding medium, thus improving the sensitivity. The proposed Mie resonators achieve a sensitivity of 486 nm/RIU and a figure of merit up to 1389 RIU−1, which are ideal for refractometric sensing.

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High-Qrefractive index sensors based on all-dielectric metasurfaces

Abstract: A high-sensitivity refractive index sensor excited by the 2D periodic TiO2 dielectric grating structure. The nanosensor can excite guided-mode resonance with a 0.19 nm ultra-narrow linewidth. Low loss all-dielectric metasurface allows ultra-sensitive biosensor detection.

Cited by 18 publications

References 67 publications

Optimization of the Geometrical Design for an All-Dielectric Metasurface Sensor with a High Refractive-Index Response

Optimization of the Geometrical Design for an All-Dielectric Metasurface Sensor with a High Refractive-Index Response

Recent Development in Metasurfaces: A Focus on Sensing Applications

Hollow Mie resonators based on toroidal magnetic dipole mode with enhanced sensitivity in refractometric sensing

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