Thermal deformation of gold nanostructures and its influence on surface plasmon resonance sensing

Kim, Hyun-Tae; Pathak, Mayank; Rajasekaran, Keshav; Gupta, Ashwani K.; Yu, Miao

doi:10.1039/c9na00714h

Cited by 6 publications

(3 citation statements)

References 36 publications

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“…The plasmonic periodic nanostructures, commonly formed by patterned metallic nanostructure arrays, can support propagating surface plasmons (PSP) mode and highly field-enhanced localized surface plasmon resonance (LSPR) mode which largely depends on the shape and size of the metallic nanostructures [6]. Different plasmonic nanostructure shapes including triangular gold nanopillars [7], Au elliptical nanoholes [8], square Au nanopatches or nanoholes [9]and circular nanodisks [10]have been employed in sensing applications. These plasmonic nanostructure sensors show rapid and highly sensitive detection, however, they usually have a great limitation: the resonance modes of the plasmonic nanoarray, especially LSPR modes, are always accompanied by a relatively wide spectral feature with low resonance dip contrast ratio because of strong radiative damping which heavily limits their sensing performance.…”

Section: Introductionmentioning

confidence: 99%

Metallic Nanodisk-in-Elliptical Nanohole Array Based Fiber Tip for Enhanced Plasmonic Refractometric Sensing

Chen,

Huang,

Zhang

2023

Plasmonics

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By enabling rapid label-free detection of biochemical substances, surface plasmon resonance (SPR) sensors have the potential to become an important tool in molecular biology and medical diagnostics. In this work, a high performance SPR fiber sensor based on metallic elliptical nanohole and circular nanodisk binary array has been proposed and studied. The binary array structure is integrated on the end facet of optical fiber to excite SPR and generate three optical resonance dips in reflection spectra in the near-infrared region. The first resonance dip not only fits the characteristics of narrow linewidth, but also has the advantages of high peakto-dip signal ratio and sensitivity. When the external environment changes in the refractive index (RI) range of 1.33˜1.40, a high RI sensitivity of 669 nm/RIU, a narrow FWHM of 5.8nm, and a high FOM value of 115.3 are yielded simultaneously for the first dip. Compared to unitary nanostructure arrays, the composite plasmonic structure of nanodisk and elliptical nanohole array demonstrated here can generate SPR modes with sharper spectral feature which is crucial to high sensitivity and precision detection technology. These features enable our proposed plasmonic fiber tip sensor hold vast application prospects in the field of medical diagnosis, environmental monitoring, and food safety.

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Section: Introductionmentioning

confidence: 99%

Metallic Nanodisk-in-Elliptical Nanohole Array Based Fiber Tip for Enhanced Plasmonic Refractometric Sensing

Chen,

Huang,

Zhang

2023

Plasmonics

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“…For example, solar absorbers for STPV should have hightemperature stability at temperatures higher than 1300 K [23]. Moreover, plasmonic nanostructures exposed to high temperatures often cause permanent deformations, which can significantly degrade the plasmonic device performance [24]. Refractory plasmonic materials can be used to replace the traditional noble metals for good thermal stability [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Broadband refractory plasmonic absorber without refractory metals for solar energy conversion

Wang

Ashalley

et al. 2020

J. Phys. D: Appl. Phys.

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Electromagnetic wave absorbers with full-spectrum near-unity solar absorption are extremely desirable for solar energy conversion. Here, we theoretically proposed a broadband refractory plasmonic absorber without refractory metal, which has nearly perfect absorption over the whole solar spectrum. The absorber is supported by a periodic refractory dielectric framework of alumina and exhibits superior solar-selective and omnidirectional absorption. The simulated average absorption efficiency is up to 96% from 300 to 1400 nm, and the solar energy absorption efficiency can reach up to 90.8% over the entire solar spectrum range. Moreover, the steady-state temperature profile indicates that the absorber heats uniformly. The broadband refractory plasmonic absorber paves the way for the selective thermal absorption under high-temperature environment and holds great promise for solar energy harvesting and desalination applications.

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“…However, flat films have a limitation in expanding the surface area. Embossed shapes such as disks, rods, and squares enlarge the sensing area and generate localized surface plasmons (LSPs), , which accelerates the collection of incident light and enhances SPR efficiency. − In addition, nanogaps shaped with engraved rings, rods, and dots exhibit the hotspot effect (generation of regions with high electromagnetic (EM) intensities for sensing) between discontinuous films. − Owing to this hotspot effect, nanogaps can help enhance sensitivity; , the relationship between the concentration of the EM field and the sensitivity of nanostructures has been elucidated in previous studies. , The aforementioned structures are fabricated using conventional processes, e.g., electron beam lithography (EBL) and focused ion beam (FIB), which pattern the required shapes with a precision close to the measurement resolution of the light source. However, they are economically infeasible as the process is time-consuming, and the achievable height is restricted. , Moreover, EBL profiles frequently depend on the characteristics of the photoresist …”

mentioning

confidence: 99%

Fiber Optic Plasmonic Sensors Based on Nanodome Arrays with Nanogaps

et al. 2022

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In this study, a high-performance fiber optic surface plasmon resonance (FO-SPR) sensor using a dome array with nanogaps (DANG) is proposed for label-free real-time detection of biomolecules. A novel and simple method using polymer beads enables high sensitivity by allowing hotspots with nanometer spacing between the Au dome and the surrounding film. The nanodome structure, which comprises a polymer core and a Au shell, induces a localized surface plasmon, expands the sensing area, and extensively enhances the electromagnetic field. The refractive index sensitivity of the FO-SPR sensor with nanostructures, i.e., with nanogaps and nanodomes, was found to be 7.8 times higher than that of the FO-SPR sensor without nanostructures. The proposed sensor achieved a low detection limit of 38 fg/mL while quantifying thyroglobulin antibody–antigen interactions and exhibited excellent selectivity. In addition, it helped detect serum samples with a 103% recovery rate.

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Thermal deformation of gold nanostructures and its influence on surface plasmon resonance sensing

Abstract: The deformation of lithographic planar gold nanostructures under cyclic thermal loading and its influence on surface plasmon resonance sensing are investigated.

Cited by 6 publications

References 36 publications

Metallic Nanodisk-in-Elliptical Nanohole Array Based Fiber Tip for Enhanced Plasmonic Refractometric Sensing

Metallic Nanodisk-in-Elliptical Nanohole Array Based Fiber Tip for Enhanced Plasmonic Refractometric Sensing

Broadband refractory plasmonic absorber without refractory metals for solar energy conversion

Fiber Optic Plasmonic Sensors Based on Nanodome Arrays with Nanogaps

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