Materials design of vertically coupled plasmonic arrays

Akinoglu, Goekalp Engin; Akinoglu, Eser Metin; Kempa, Krzysztof; Hutchison, James A.

doi:10.1039/d1na00647a

Cited by 6 publications

(4 citation statements)

References 46 publications

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“…Ag as a plasmonic metal has superior electric near-field enhancements and, consequently, better SERS performance than Au but suffers from oxidation, and the difference for Ag/Au substrates observed in this study is in line with what is expected from the literature. 66 Although these substrates can detect diverse analyte molecules, it is imperative to optimize them for detecting the molecules of interest. There are several avenues for the improvement of these substrates.…”

Section: Resultsmentioning

confidence: 99%

Hybrid Surface-Enhanced Raman Scattering Substrates for the Trace Detection of Ammonium Nitrate, Thiram, and Nile Blue

et al. 2022

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We report the fabrication and performance evaluation of hybrid surface-enhanced Raman scattering (SERS) substrates involving laser ablation and chemical routes for the trace-level detection of various analyte molecules. Initially, picosecond laser ablation experiments under ambient conditions were performed on pure silver (Ag) and gold (Au) substrates to achieve distinct nanosized features on the surface. The properties of the generated surface features on laser-processed portions of Ag/Au targets were systematically analyzed using UV–visible reflection and field emission scanning electron microscopy studies. Later, hybrid-SERS substrates were achieved by grafting the chemically synthesized Au nanostars on the plain and laser-processed plasmonic targets. Subsequently, we employed these as SERS platforms for the detection of a pesticide (thiram), a molecule used in explosive compositions [ammonium nitrate (AN)], and a dye molecule [Nile blue (NB)]. A comparative SERS study between the Au nanostar-decorated bare glass, silicon, Ag, Au, and laser-processed Ag and Au targets has been established. Our studies and the obtained data have unambiguously determined that laser-processed Ag structures have demonstrated reasonably good enhancements in the Raman signal intensities for distinct analytes among other substrates. Importantly, the fabricated hybrid SERS substrate of “Au nanostar-decorated laser-processed Ag” exhibited up to eight times enhancement in the SERS intensity compared to laser-processed Ag (without nanostars), as well as up to three times enhancement than the Au nanostar-loaded plain Ag substrates. Additionally, the achieved detection limits from the Au nanostar-decorated laser-processed Ag SERS substrate were ∼50 pM, ∼5 nM, and ∼5 μM for NB, thiram, and AN, respectively. The estimated enhancement factors accomplished from the Au nanostar-decorated laser-processed Ag substrate were ∼10 6 , ∼10 6 , and ∼10 4 for NB, thiram, and AN, respectively.

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Section: Resultsmentioning

confidence: 99%

Hybrid Surface-Enhanced Raman Scattering Substrates for the Trace Detection of Ammonium Nitrate, Thiram, and Nile Blue

et al. 2022

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“…13,16,23 Near-Field Enhancement and Light−Matter Coupling Plasmonic templates confine light and strongly enhance the electric near-field enhancement at their surfaces. 24 The electric near-field enhancement is an important parameter for amplification in surface-enhanced spectroscopy. The near-field enhancement is generally strongest for small junctions and gaps between plasmonic arrays when the plasmonic modes hybridize.…”

Section: Plasmon Excitation Energymentioning

confidence: 99%

“…Plasmonic templates confine light and strongly enhance the electric near-field enhancement at their surfaces . The electric near-field enhancement is an important parameter for amplification in surface-enhanced spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Tuning Light–Matter Interactions with Mid-Infrared Plasmonic Coaxial Apertures

Akinoglu

Hutchison

2023

ACS Appl. Opt. Mater.

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Thin plasmonic coaxial apertures have unique optical properties, including extraordinary light transmission and confinement, that can enhance light−matter interactions and can be applied for sensing applications. Here, we use finite-difference time-domain simulations to investigate the mid-infrared optical response of coaxial aperture arrays, consisting of a combination of disk arrays and perforated films of periodically arranged holes. We find that the plasmon response of these arrays is governed by the disk size with little influence from the hole size, with surface plasmon excitation around the circumference of the disks mediating extraordinary optical transmission and strong nearfield enhancements. The simulations also predict that light−matter coupling with the vibrational modes of a poly(methyl methacrylate) film placed inside the coaxial apertures can be tuned from weak to strong by adjusting the thickness of the coaxial aperture array's metal film. Such open structures that can promote tailored light− matter interactions are therefore attractive target platforms for plasmon-enhanced sensing and polaritonic chemistry.

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“…Nonetheless, the Babinet principle has inspired a number of works [4,[37][38][39][40][41] where complementary structures of various configurations (holes/disks and far beyond) have been designed with almost perfectly complementary electromagnetic properties. Moreover, so-called 'Babinet-type' metasurfaces with a simultaneous use of complementary holes and disks have been suggested for cancelling out absorption and increasing reflectance [42] or for highly tunable transmittance [43,44].…”

Section: Introductionmentioning

confidence: 99%

Light scattering by plasmonic disks and holes arrays: different or the same?

Rasskazov

Sonwalkar²,

Carney

2022

J. Phys. D: Appl. Phys.

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We suggest a strategy for designing regular 2D arrays of nanoholes (NHs) in metal films with far-field scattering properties similar to that of regular 2D arrays of nanodisks (NDs) with the same periodicity. Full-wave simulations for perfectly conducting, Ag and Au NDs and respectively designed arrays of NHs demonstrate a minor difference between far-field properties either at wavelengths corresponding to Wood–Rayleigh anomalies of the arrays or in a broad wavelength range, depending on the array periodicity and sizes of NDs (NHs). Our results have broad implications in plasmon-enhanced-driven applications, including optoelectronic and photovoltaic devices, where the NH arrays are preferable to be fabricated for nano-structured optics.

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Materials design of vertically coupled plasmonic arrays

Abstract: Plasmonic metasurfaces have important applications in life science, optics, and catalysis. However, their industrial usage is limited by the challenges of high throughput nanofabrication. A promising solution is the transfer...

Cited by 6 publications

References 46 publications

Hybrid Surface-Enhanced Raman Scattering Substrates for the Trace Detection of Ammonium Nitrate, Thiram, and Nile Blue

Hybrid Surface-Enhanced Raman Scattering Substrates for the Trace Detection of Ammonium Nitrate, Thiram, and Nile Blue

Tuning Light–Matter Interactions with Mid-Infrared Plasmonic Coaxial Apertures

Light scattering by plasmonic disks and holes arrays: different or the same?

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