High-sensitivity long-range surface plasmon resonance sensing assisted by gold nanoring cavity arrays and nanocavity coupling

Luo, Xiaojun; Tan, Rui; Li, Qiuju; Chen, Jiaxin; Xie, Yu; Jiang, Peng; Zeng, Mei; Jiang, Minghang; Wu, Caijun; He, Yi

doi:10.1039/d2cp05664j

Cited by 12 publications

(7 citation statements)

References 48 publications

(74 reference statements)

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“…Therefore, the hybrid sensor performs better overall, as the incident angle is about

, which can be clearly distinguished from the spectral response of such sensors at different incident angles. Moreover, as listed in Table 1 , if it is compared with some previous MIM meta-gratings [ 11 , 34 , 38 , 39 , 40 , 41 , 42 , 43 ], the sensing performance of our device is still good.…”

Section: Resultsmentioning

confidence: 91%

Dual-Function Meta-Grating Based on Tunable Fano Resonance for Reflective Filter and Sensor Applications

Liu

Jia

Chen

et al. 2023

Sensors

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Localized surface plasmon resonance (LSPR)-based sensors exhibit enormous potential in the areas of medical diagnosis, food safety regulation and environmental monitoring. However, the broadband spectral lineshape of LSPR hampers the observation of wavelength shifts in sensing processes, thus preventing its widespread applications in sensors. Here, we describe an improved plasmonic sensor based on Fano resonances between LSPR and the Rayleigh anomaly (RA) in a metal–insulator–metal (MIM) meta-grating, which is composed of silver nanoshell array, an isolation grating mask and a continuous gold film. The MIM configuration offers more freedom to control the optical properties of LSPR, RA and the Fano resonance between them. Strong couplings between LSPR and RA formed a series of narrowband reflection peaks (with a linewidth of ~20 nm in full width at half maximum (FWHM) and a reflectivity nearing 100%) within an LSPR-based broadband extinction window in the experiment, making the meta-grating promising for applications of high-efficiency reflective filters. A Fano resonance that is well optimized between LSPR and RA by carefully adjusting the angles of incident light can switch such a nano-device to an improved biological/chemical sensor with a figure of merit (FOM) larger than 57 and capability of detecting the local refractive index changes caused by the bonding of target molecules on the surface of the nano-device. The figure of merit of the hybrid sensor in the detection of target molecules is 6 and 15 times higher than that of the simple RA- and LSPR-based sensors, respectively.

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“…Therefore, the hybrid sensor performs better overall, as the incident angle is about

Section: Resultsmentioning

confidence: 91%

Dual-Function Meta-Grating Based on Tunable Fano Resonance for Reflective Filter and Sensor Applications

Liu

Jia

Chen

et al. 2023

Sensors

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“…In order to study the practical value and advantages of our absorber, we also discussed the situation at different incidence angles [59,60]. The scanned images of TE and TM waves are shown in Figure 10 and are compared with other absorbers developed in recent years, as shown in Table 2 [61][62][63][64][65]. Figure 10a shows the scanning pattern of TE waves with changes in incident angle.…”

Section: Resultsmentioning

confidence: 99%

“…of absorbers in this article with other absorbers developed in recent yearsReferenceOperation Band Max Absoptivity Structure Laye[61] 0.4-1.4 THz 96.3% 5[62] 4.5-9.95 THz 99.9% 5[63] 4.04-9.41 THz 99.5% 3…”

mentioning

confidence: 99%

Active Broadband Absorber Based on Phase-Change Materials Optimized via Evolutionary Algorithm

Ma,

Tian,

Cheng

et al. 2023

Coatings

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This article proposes a temperature-controlled absorber based on VO2, which consists of five layers: a disk-shaped VO2 layer array, a dielectric layer, a circular hole VO2 array, a SiO2 layer, and a gold substrate from top to bottom. We optimized the thickness of the other four layers of the absorber, except for the gold layer, using PSO. After ten iterations, we determined that the optimal parameters for the top-to-bottom four-layer thicknesses were 0.183 μm, 0.452 μm, 0.557 μm and 1.994 μm. At this point, our absorber reached the optimal absorption parameters, and we plotted the absorption spectrum under these conditions. We found that the absorption rate at 29.1–47.2 THz was higher than 90%, and the absorption bandwidth was as high as 18.1 THZ. This frequency band covers most of the atmospheric window area (23–37.5 THz), so it will have good practicality. At 30.8 THz and 43.12 THz, there were perfect absorption peaks with absorption rates of 99.99% and 99.99%, respectively. We explained the cause of absorption from the perspective of electric field, and then we studied the change in the absorption curve of the absorber when the temperature of VO2 changed, and we can directly observe the changes in the electric field to explain this. Finally, we can tune the bandwidth and absorption rate of the absorber by changing the structure of the VO2 pattern. After comparing with other absorbers developed in recent years, our absorber still has good competitiveness, and we believe that our solution is expected to have outstanding performance in fields such as photothermal conversion and thermal stealth in the future.

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“…Further, the resonance linewidth can be reduced by coupling plasmons to a system with a narrow resonance, such as photonic cavity, due to the modified photonic density of states. This effect has been demonstrated in various systems, including gold nanorods [18], nanodisks [19], and nanorings [20] positioned above a gold mirror. However, to the best of our knowledge, there is currently no data available on the impact of coupling in the NHAs-photonic cavity system on refractive index sensing performance.…”

Section: Introductionmentioning

confidence: 87%

Impact of Optical Cavity on Refractive Index Sensitivity of Gold Nanohole Arrays

Shokova,

Bochenkov

2023

Biosensors

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Refractive index sensing based on surface plasmon resonance (SPR) is a highly efficient label-free technique for biomolecular detection. The performance of this method is defined by the dielectric properties of a sensing layer and its structure. Nanohole arrays in thin metal films provide good refractive index sensitivity but often suffer from a large resonance linewidth, which limits their broad practical application in biosensorics. Coupling the broad plasmon modes to sharp resonances can reduce the peak widths, but at the same time it can also degrade the sensitivity. Here, we use Finite-Difference Time Domain simulations to study the factors affecting the sensing performance of gold-silica-gold optical cavities with nanohole arrays in the dielectric and top metal layers. We demonstrate that by tuning resonator size and inter-hole spacing, the performance of the biosensor can be optimized and the figure of merit of the order of 5–7 is reached.

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High-sensitivity long-range surface plasmon resonance sensing assisted by gold nanoring cavity arrays and nanocavity coupling

Abstract: A long-range surface plasmon resonance substrate, which consists of a gold nanoring cavity array built on a refractive index-symmetric spacer layer and an Au mirror, facilitates much higher RI sensitivity and a narrower FWHM than a conventional SPR substrate.

Cited by 12 publications

References 48 publications

Dual-Function Meta-Grating Based on Tunable Fano Resonance for Reflective Filter and Sensor Applications

Dual-Function Meta-Grating Based on Tunable Fano Resonance for Reflective Filter and Sensor Applications

Active Broadband Absorber Based on Phase-Change Materials Optimized via Evolutionary Algorithm

Impact of Optical Cavity on Refractive Index Sensitivity of Gold Nanohole Arrays

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