Design of Aluminum Bowtie Nanoantenna Array with Geometrical Control to Tune LSPR from UV to Near-IR for Optical Sensing

Wang, Bin; Singh, Subhash C.; Lü, Hongliang; Guo, Chunlei

doi:10.1007/s11468-019-01071-z

Cited by 56 publications

(28 citation statements)

References 65 publications

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“…[156] Al is a promising candidate for UV plasmonics considering its natural abundance and low cost, UV resonance range down to 210 nm, and a self-limiting native oxide which is typically only 2-3 nm thick. [157] Moreover, its NIR sensitivity is similarly impressive, with a maximum resonance wavelength of 1600 nm reported on Al nano-bowties. [158] The SERS enhancement factor of Al tends to be in the 10 3 to 10 6 range, which is comparable to that of Ag in the near UV (300 to 400 nm), while vastly superior in the mid-UV range (200 to 300 nm).…”

Section: Perspective On New Materials For Broader Wavelength Rangementioning

confidence: 92%

Rainbows at the End of Subwavelength Discontinuities: Plasmonic Light Trapping for Sensing Applications

Farid

Dixon

Shayegannia

et al. 2021

Advanced Optical Materials

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Surface plasmon polaritons (SPPs) which exist at the metal-dielectric interface are guided by the coupling of electromagnetic waves to oscillations in the electron gas plasma created at metal surfaces. Plasmonics, a subset of the field of nanophotonics pertaining to all things beyond the diffraction limit, has flourished and evolved significantly over the past decade offering practical utility to a variety of applications. [1] Notwithstanding the ohmic loss in metals and commensurate limited propagation lengths of SPPs, the ability to effectively concentrate light in nanoscale volumes and generate extremely high electric field intensities at discontinuities or subwavelength patterned surfaces offers unique opportunities to enhance lightmatter interactions for a diverse range of functionalities. [2] Trapping broadband electromagnetic radiation over a range of deep subwavelength guided modes in a given structure provides opportunities for light-matter interactions at the nanoscale. Use of materials-commonly metals-that exhibit negative dielectric permittivity (ε < 0) at optical frequencies provide an optimum solution for light localization. Nanometallic light concentrators, in contrast to their dielectric counterparts, can squeeze and localize light into subwavelength volumes with greater control and higher efficiency. [3] Such plasmonic light concentration can be achieved by either resonant or non-resonant structures. In resonant structures, SPPs are created by time-varying electric fields that exert a force on the negatively charged electron gas inside a metal. These oscillations are resonantly driven leading to a strong charge displacement at specific optical frequencies and concentration of the light field within the structures. [4] For non-resonant light concentration effects, Schuller et al. demonstrated subwavelength light localization by introducing a feed gap in the metal structure for retardation-based resonators. The gap builds up opposite charges across it whereby SPPs encounter a longitudinal electric field component causing strong sub-wavelength light localization. [2] The focus of this article is plasmonic devices that enable rainbow light trapping, a specific modality of nanoscale field enhancement in which trapped light is spatially separated This article presents recent advances in plasmonic multiwavelength rainbow light trapping, a field that has evolved over the last decade and today is an active area of research interest encompassing a manifold of potential applications which include optical biosensing, photodetection, spectroscopy, and medicine. Conventional plasmonic devices are designed and optimized to enhance optical performance at single wavelengths, and as such are not suitable for applications that require electromagnetic field localization at multiple frequencies or broad frequency ranges of interest. To overcome these limitations, the ability to slow and trap light at multiple wavelengths and at different spatial locations has attracted significant scientific attention and opened up n...

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Section: Perspective On New Materials For Broader Wavelength Rangementioning

confidence: 92%

Rainbows at the End of Subwavelength Discontinuities: Plasmonic Light Trapping for Sensing Applications

Farid

Dixon

Shayegannia

et al. 2021

Advanced Optical Materials

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“…Another relevant study related to nanotriangles was presented by Wang et al [ 139 ] with a numerical work on bow-tie nanostructures in a MIM configuration. This configuration presented significant enhancement factors, caused by strongly confined E-fields on a very small gap region.…”

Section: Nanostructuresmentioning

confidence: 99%

Advances in Plasmonic Sensing at the NIR—A Review

Santos

Almeida

Pastoriza‐Santos

et al. 2021

Sensors

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Surface plasmon resonance (SPR) and localized surface plasmon resonance (LSPR) are among the most common and powerful label-free refractive index-based biosensing techniques available nowadays. Focusing on LSPR sensors, their performance is highly dependent on the size, shape, and nature of the nanomaterial employed. Indeed, the tailoring of those parameters allows the development of LSPR sensors with a tunable wavelength range between the ultra-violet (UV) and near infra-red (NIR). Furthermore, dealing with LSPR along optical fiber technology, with their low attenuation coefficients at NIR, allow for the possibility to create ultra-sensitive and long-range sensing networks to be deployed in a variety of both biological and chemical sensors. This work provides a detailed review of the key science underpinning such systems as well as recent progress in the development of several LSPR-based biosensors in the NIR wavelengths, including an overview of the LSPR phenomena along recent developments in the field of nanomaterials and nanostructure development towards NIR sensing. The review ends with a consideration of key advances in terms of nanostructure characteristics for LSPR sensing and prospects for future research and advances in this field.

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“…30 Periodic arrays of nanorings [31][32][33] have been investigated for high gure of merit. Multiple layer metal-insulator-metal nanodisks 34 and bowtie nanoantenna 35 have been reported. Chiral gold (Au) nanohooks have been presented with circular dichroism measurements for increased refractive index sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Periodic arrays of plasmonic crossed-bowtie nanostructures interspaced with plasmonic nanocrosses for highly sensitive LSPR based chemical and biological sensing

2021

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Design of Aluminum Bowtie Nanoantenna Array with Geometrical Control to Tune LSPR from UV to Near-IR for Optical Sensing

Cited by 56 publications

References 65 publications

Rainbows at the End of Subwavelength Discontinuities: Plasmonic Light Trapping for Sensing Applications

Rainbows at the End of Subwavelength Discontinuities: Plasmonic Light Trapping for Sensing Applications

Advances in Plasmonic Sensing at the NIR—A Review

Periodic arrays of plasmonic crossed-bowtie nanostructures interspaced with plasmonic nanocrosses for highly sensitive LSPR based chemical and biological sensing

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