Optimization of the grating-based structures for the efficient SERS substrates

Yaremchuk, Iryna; Petrovska, H.; Karelko, Iryna; Fitio, Volodymyr; Bobitski, Yaroslav

doi:10.1109/elnano.2017.7939730

Cited by 8 publications

(5 citation statements)

References 15 publications

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“…Therefore, irrespectively of the polarization of the laser excitation, there are arrays coupled to the electric field of the incident wave. Theoretical models of SP excitations in single nanocavities [46,47] and in periodic rectangular gratings [48,49] suggest that the strongest electrodynamic enhancement takes place near the parallel edges of the metallic sheets, which could act as effective SERS hot spots [50]. In to hot-spots found in nanoparticle-based SERS substrates-which are essentially point-like (0D) objects-the hot-spots in metallic gratings have linear (1D) character, and can accommodate a larger number of adsorbed molecules.…”

Section: Resultsmentioning

confidence: 99%

“…The local EM enhancement of the Raman signal was estimated as 𝑔(𝐫) = |𝐸(𝐫) 𝐸 0 ⁄ | 4 where E(r) is the amplitude of the local electric field at point r of the metal-air interface and E0 is the amplitude of the incident wave [50]. Figure 6b shows the calculated distribution of 𝑔(𝐫) along the vertical surfaces of the silver sheets, corresponding to the parameters of the "s"-flowers and for the wavelength λ0 = 633 nm of the b a h Theoretical models of SP excitations in single nanocavities [46,47] and in periodic rectangular gratings [48,49] suggest that the strongest electrodynamic enhancement takes place near the parallel edges of the metallic sheets, which could act as effective SERS hot spots [50]. In contrast to hot-spots found in nanoparticle-based SERS substrates-which are essentially point-like (0D) objects-the hot-spots in metallic gratings have linear (1D) character, and can accommodate a larger number of adsorbed molecules.…”

Section: Resultsmentioning

confidence: 99%

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Silver Flowerlike Structures for Surface-Enhanced Raman Spectroscopy

et al. 2021

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Micro- and nanoflowers are a class of materials composed of particles with high surface-to-volume ratio. They have been extensively studied in the last decade due to simple preparation protocols and promising applications in biosensing, as drug delivery agents, for water purification, and so on. Flowerlike objects, due to their highly irregular surface, may act also as plasmonic materials, providing resonant coupling between optical waves and surface plasmon excitations. This fact allows us to infer the possibility to use micro- and nanoflowers as effective surface-enhanced Raman scattering (SERS) substrate materials. Here, we report on the design and Raman enhancement properties of silver flowerlike structures, deposited on aluminum surface. A simple and cost-effective fabrication method is described, which leads to SERS substrates of high developed surface area. The morphology of the silver flowers on a nanoscale is characterized by self-organized quasiperiodic stacks of nanosheets, which act as plasmonic cavity resonators. The substrates were tested against rhodamine-6G (R6G) water solutions of concentration varying between 10−3 M and 10−7 M. Optimal SERS enhancement factors of up to 105 were established at R6G concentrations in the 10−6–10−7 M range.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Silver Flowerlike Structures for Surface-Enhanced Raman Spectroscopy

et al. 2021

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“…where 𝜆 SP is the frequency-dependent SP wavelength, and 𝜙 is the phaseshift of the wave reflected from the bottom of the grooves, and m is the number of wave nodes. Theoretical models of SP excitations in single nanocavities [43,44] and in periodic rectangular gratings [45,46] suggest that the strongest electrodynamic enhancement takes place near the parallel edges of the metallic sheets, which could act as effective SERS hot spots [47]. In contrast to hot-spots found in nanoparticle based SERS substrates, which are essentially point-like (0D) objects, the hot-spots in metallic gratings have linear (1D) character, and can accommodate a larger number of adsorbed molecules.…”

Section: Ef (10mentioning

confidence: 99%

Silver Flowerlike Structures for Surface-Enhanced Raman Spectroscopy

Ivanov¹,

Tsutsumanova²,

Todorov³

et al. 2021

Preprint

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Micro- and nanoflowers are a class of materials composed of particles with high surface-to-volume ratio. They are being extensively studied in the last decade due to simple preparation protocols and promising applications in biosensing, as drug delivery agents, for water purification and so on. Flowerlike objects, due to their highly irregular surface, may act also as plasmonic materials, providing resonant coupling between optical waves and surface plasmon excitations. This fact infers for the possibility to use micro- and nanoflowers as effective surface-enhanced Raman scattering (SERS) substrate materials. Here, we report on the design and Raman enhancement properties of silver flowerlike structures, deposited on aluminum surface. A simple and cost-effective fabrication method is described, which leads to SERS substrates of high developed surface area. The morphology of the silver flowers on a nanoscale is characterized by self-organized quasiperiodic stacks of nanosheets, which act as plasmonic cavity-resonators. The substrates were tested against rhodamine-6G (R6G) water solutions of concentration varying between 10–3 M and 10–7 M. Optimal SERS enhancement factors of up to 105 were established at R6G concentrations in the range 10–6 – 10–7 M.

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“…It should be noted that gratings parameters and as a result their optical responses are also sensitive to the temperature changes [ 13 , 14 , 15 ]. It can be found a lot of works regarding optimization methods of the grating-based (photonic crystals) structures [ 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Features of the Resonance in a Rectangular Dielectric Surace-Relief Gratings Illuminated with a Limited Cross Section Gaussian Beam

et al. 2021

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In this work the features of the resonance in a rectangular dielectric surface-relief gratings, illuminated with a limited cross-section Gaussian beam, have been studied. The rigorous coupled wave method and beam decomposition into the plane waves by the Fourier transform have been used. It is shown that there is a resonant wavelength for each thickness of the dielectric grating. The value of resonant wavelength depends on the beam angle of incidence on the gratings. Moreover, the two types of resonances can occur in the grating at certain grating parameters. The power reflection coefficient is practically equal to unity for the first type of resonance and is much smaller than unity, for the second one. The obtained results extend the knowledge regarding the nature of the waveguide resonance in the dielectric grating, considering the limited cross section beam, and they can increase its use in many applications.

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Optimization of the grating-based structures for the efficient SERS substrates

Cited by 8 publications

References 15 publications

Silver Flowerlike Structures for Surface-Enhanced Raman Spectroscopy

Silver Flowerlike Structures for Surface-Enhanced Raman Spectroscopy

Silver Flowerlike Structures for Surface-Enhanced Raman Spectroscopy

Features of the Resonance in a Rectangular Dielectric Surace-Relief Gratings Illuminated with a Limited Cross Section Gaussian Beam

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