Refractive index sensitivities of plane Ag nanosphere cluster sensors

Du, Chunling; Wang, Binbin; Sun, Fan; Huang, Mingli; He, Chongjun; Liu, Youwen; Zhang, XueJin; Shi, Dan

doi:10.1016/j.snb.2015.03.058

Cited by 12 publications

(7 citation statements)

References 17 publications

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“…The responsivity of the plasmonic devices was evaluated and compared using Equation (2). Because the LSPR response to the wide range of refractive indexes tends to be non-linear and quadratically even more so when plasmon modes are coupled [49,50], the responsivity was evaluated in the refractive index range of n = 1.3562-1.3728. Figure 10d presents a comparison of the responsivity of each plasmonic devices.…”

Section: Re-shaping Effect On the Responctivities To The Surrounding Refractive Index Of Plasmonic Devices Based On Processed Cop Moldsmentioning

confidence: 99%

Modulating Optical Characteristics of Nanoimprinted Plasmonic Device by Re-Shaping Process of Polymer Mold

et al. 2021

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Metal nanostructures exhibit specific optical characteristics owing to their localized surface plasmon resonance (LSPR) and have been studied for applications in various optical devices. The LSPR property strongly depends on the size and shape of metal nanostructures; thus, plasmonic devices must be designed and fabricated according to their uses. Nanoimprint lithography (NIL) is an effective process for repeatedly fabricating metal nanostructures with controlled sizes and shapes and require optical properties. NIL is a powerful method for mass-producible, low-cost, and large-area fabrication. However, the process lacks flexibility in adjusting the size and shape according to the desirable optical characteristics because the size and shape of metal nanostructures are determined by a single corresponding mold. Here, we conducted a re-shaping process through the air-plasma etching of a polymer’s secondary mold (two-dimensional nanopillar array made of cyclo-olefin polymer (COP)) to modulate the sizes and shapes of nanopillars; then, we controlled the spectral characteristics of the imprinted plasmonic devices. The relationship between the structural change of the mold, which was based on etching time, and the optical characteristics of the corresponding plasmonic device was evaluated through experiments and simulations. According to evaluation results, the diameter of the nanopillar was controlled from 248 to 139 nm due to the etching time and formation of a pit structure. Consequently, the spectral properties changed, and responsivity to the surrounding dielectric environment was improved. Therefore, plasmonic devices based on the re-shaped COP mold exhibited a high responsivity to a refractive index of 906 nm/RIU at a wavelength of 625 nm.

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Section: Re-shaping Effect On the Responctivities To The Surrounding Refractive Index Of Plasmonic Devices Based On Processed Cop Moldsmentioning

confidence: 99%

Modulating Optical Characteristics of Nanoimprinted Plasmonic Device by Re-Shaping Process of Polymer Mold

et al. 2021

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“…However, it is important to note that the size of the AgNPs model was the same in both cases. In this sense, it has been reported that the reactivity of the AgNPs can vary with respect to particle size; for example, only small decahedral structures exhibit superior catalytic activity compared with cubooctahedral structures [39,40,[42][43][44]. In this case, the experimental results observed by TEM images indicate that, in AgNPs-NaBH 4 sample, the cubooctahedral structures appear with major frequency and with a significant minor particle size (17 nm) with respect to the AgNPs-EG sample (40 nm).…”

Section: Dft Molecular Simulationmentioning

confidence: 99%

Comparative Study of Ag Nanostructures: Molecular Simulations, Electrochemical Behavior, and Antibacterial Effect

Ruíz-Baltazar

Reyes-López

Ordaz

et al. 2016

Journal of Nanomaterials

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Nanoparticles of Ag with different sizes and structures were obtained and studied. Two methods for reductions of Ag ions were employed, chemical reduction by sodium borohydride and ethylene glycol. Cuboctahedral and icosahedral structures were obtained. Molecular simulations were carried out in order to evaluate the reactivity of both structures. On the other hand, the electrochemical activity and antibacterial effect (E. coli) of the cuboctahedral and icosahedral structures were measured experimentally. The results obtained by molecular simulation, cyclic voltammetry, and antibacterial effect were compared and discussed in this work.

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“…The coupling of light with surface plasmons can be controlled to obtain novel performances, e.g., enhanced optical transmission, strong field confinement, and Fano resonances [3][4][5][6][7]. These remarkable features endow plasmonic structures an extreme sensitivity to the refractive index (RI) change of surrounding mediums with the penetration depth of the evanescent field [5,[8][9][10][11]. Based on the susceptibility to the change in RI of surrounding mediums due to the spectral shift caused by the excited surface plasmons [10][11][12], a promising technology has been developed for simple, label-free, cost-effective, and real-time optical sensing [8,[13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…These remarkable features endow plasmonic structures an extreme sensitivity to the refractive index (RI) change of surrounding mediums with the penetration depth of the evanescent field [5,[8][9][10][11]. Based on the susceptibility to the change in RI of surrounding mediums due to the spectral shift caused by the excited surface plasmons [10][11][12], a promising technology has been developed for simple, label-free, cost-effective, and real-time optical sensing [8,[13][14][15]. So far, numerous sensors based on metallic nanostructures have been witnessed and widely employed for the detection of various analytes including cancer biomarkers, hazardous or toxic gases, DNA, and so on [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Metallic nanoparticles have been demonstrated with high susceptibility to the change in RI of surrounding mediums, and their RI sensitivity can be largely enhanced by optimizing the shapes, sizes, and arrangement of metallic nanoparticles [8][9][10][11]. Consequently, metallic nanoparticles have also been used to act as the sensor materials due to their inherent high susceptibility for the RI changes in environment.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Band High Refractive Index Susceptibility of Plasmonic Structures with Network-Type Metasurface

Liu

et al. 2015

Plasmonics

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We theoretically propose a simple plasmonic structure with network-type metasurface consisting of double-layer metal-dielectric network-type metasurface on the two-layer dielectric films. Multiple reflection bands with minimum full width at half maximum of 3 nm are achieved in the visible and near-infrared regions due to the excitation and hybridized coupling of localized surface plasmons, photonic mode, and optical cavity mode. The plasmonic structure with network-type metasurface also shows highly tunable refractive index sensing performance. The maximum sensitivity to the refractive index (RI) change reaches to 596 nm/RIU (RIU: refractive index unit). The figure of merit can reach as high as 68.57. These results show that the plasmonic structure with networktype metasurface could pave a new way for the highperformance multi-band devices such as sensors and filters.

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Refractive index sensitivities of plane Ag nanosphere cluster sensors

Cited by 12 publications

References 17 publications

Modulating Optical Characteristics of Nanoimprinted Plasmonic Device by Re-Shaping Process of Polymer Mold

Modulating Optical Characteristics of Nanoimprinted Plasmonic Device by Re-Shaping Process of Polymer Mold

Comparative Study of Ag Nanostructures: Molecular Simulations, Electrochemical Behavior, and Antibacterial Effect

Multi-Band High Refractive Index Susceptibility of Plasmonic Structures with Network-Type Metasurface

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