Tailoring uniform gold nanoparticle arrays and nanoporous films for next-generation optoelectronic devices

Farid, Sidra; Kuljic, Rade; Poduri, Shripriya; Darling, Seth B.

doi:10.1016/j.spmi.2018.04.006

Cited by 10 publications

(4 citation statements)

References 22 publications

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“…Silver (Ag) and gold (Au) NPs dispersed in solution or deposited on a flat surface have long been used to create plasmonic hotspots for SERS, but the narrow extinction bands of Ag and Au render their sensitivity to one or two wavelengths. [84,85] Alloying materials to create composite NPs does improve the wavelength sensitivity, but only marginally. [86][87][88] Mao et al proposed a creative solution to this problem using concepts from transformation optics.…”

Section: Nanoparticles and 3d Arraysmentioning

confidence: 99%

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: Nanoparticles and 3d Arraysmentioning

confidence: 99%

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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“…Moreover, these beam splitters are small in size and easy to integrate. With the development of lithography [24], many different-structure sub-wavelength polarization beam splitters are designed. Zheng et al designed the reflective polarizing beam splitter under the Bragg incidence by using the modal method and the rigorous coupled-wave method [25].…”

Section: Introductionmentioning

confidence: 99%

T-shaped reflective polarizer under second Bragg incidence

Gao¹,

Wang²

2020

Phys. Scr.

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A T-shaped reflective grating device under the second Bragg angle is proposed for polarizer. This grating device is mainly made of fused silica with T-shaped ridges, which can diffract the energy of the TE-polarized light and the TM-polarized light to the −2nd order and the 0th order with the reflective efficiency of each order more than 95%. Normalized field magnitude distribution and overlap integral are analyzed to explain the physical mechanism and energy exchange. Based on the optimized results, the beam splitter exhibits high efficiency, good extinction ratio and optical properties of the incident bandwidth. Moreover, grating can have longer period for easy fabrication under second Bragg incidence compared to reported Bragg incidence. Therefore, the T-shaped reflective grating device should be useful for the future optical communication industry.

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“…Scaling it down to the nanometer size leads to achieving completely novel properties of gold nanoparticles (Au NPs) greatly differing from those of the bulk counterparts [2][3][4]. Such functional properties of Au NPs have found a wide spectrum of potential applications ranging from electronics [5], energy [6] and catalysis [7][8][9] to nano-and bio-medicine [10,11], sensors [12], optoelectronics [13], food control [14], etc.…”

Section: Introductionmentioning

confidence: 99%

Investigation of electro-oxidation of glucose at gold nanoparticles/carbon composites prepared in the presence of halide ions

Upskuvienė¹,

Šimkūnaitė²,

Vaičiūnienė³

et al. 2020

chemija

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In this study, the carbon powder supported gold nanoparticles composites (AuNPs/C) were prepared via the chemical reduction method by employing sodium citrate or a complex mixture of glucose and ascorbic acid as reducing agents in the presence of small amounts of different halide ions (Cl–, Br–, I–). The electrocatalytic activity of the synthesized composites was evaluated for the electro-oxidation of glucose in an alkaline medium using cyclic voltammetry, whereas the morphology and composition of composites were characterized using field emission scanning electron microscopy and inductively coupled plasma optical emission spectroscopy. The electrochemical measurements demonstrate the enhanced electrocatalytic performance of the AuNPs/C composites prepared by the help of different reducing agents coupled with halide ions for the electro-oxidation of glucose as compared to that of composites that were synthesized by the use only of the reducing agents barely. The AuNPs/C composites synthesized with the presence of KCl, KBr or KI additive in the reaction mixture generate the increased glucose electro-oxidation current density values; furthermore, the glucose electro-oxidation potential is shifted to more negative values as compared to those obtained on the synthesized composites without halide additive.

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Tailoring uniform gold nanoparticle arrays and nanoporous films for next-generation optoelectronic devices

Cited by 10 publications

References 22 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

T-shaped reflective polarizer under second Bragg incidence

Investigation of electro-oxidation of glucose at gold nanoparticles/carbon composites prepared in the presence of halide ions

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