In-plane optical anisotropy and SERS detection efficiency of self-organized gold nanoparticles on silicon nanoripples: Roles of growth angle and postgrowth annealing

Saini, Mahesh; Augustine, Sebin; Ranjan, Mukesh; Som, T.

doi:10.1016/j.apsusc.2020.145703

Cited by 32 publications

(12 citation statements)

References 39 publications

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“…On the other hand, imaginary part of dielectric function reveals a sharp LSPR peak due to strong coupling between Au-nanoparticles which is governed by the reduced gap between nanoparticles along the nanoparticle arrays [42]. A LSPR peak appears at 499 nm, 504 nm, and 507 nm corresponding to Au-nanoparticles grown at 65°, 70°, and 80°growth angles, respectively.…”

Section: Anisotropic Specimen: Au-nanoparticle Arrays On Rippled-simentioning

confidence: 98%

“…21 Au-nanoparticle arrays on rippled-Si grown at oblique incidences of 65°, 70°, and 80°are investigated by using GE and the measured parameters are i j and i j (i = s, p; j = s, p). Adapted with permission from [42]. © 2020 Elsevier B.V.…”

Section: Anisotropic Specimen: Au-nanoparticle Arrays On Rippled-simentioning

confidence: 99%

Section: Anisotropic Specimen: Au-nanoparticle Arrays On Rippled-simentioning

confidence: 99%

“…Fig.13a-b SEM images of as-deposited and post-growth annealed Au-nanoparticles decorated (at 65°) rippled-Si substrates, respectively and their corresponding reflection spectra for electric field along (E || ) and across (E ⊥ ) to ripples. Adapted with permission from[42]. © 2020 Elsevier B.V.…”

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confidence: 99%

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Ellipsometry Techniques and Its Advanced Applications in Plasmonics

Saini

Augustine

Sooraj

et al. 2021

Modern Techniques of Spectroscopy

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Ellipsometry is a versatile optical measurement technique which uses polarized light as a probe to characterize various properties of materials viz. film thickness, dielectric functions, uniformity, etc. by detecting the change in the polarization state. In spite of the basic applications, ellipsometry technique is highly used in advanced plasmonic applications like characterization of plasmonic -waveguides, -switches, -tweezers, -circuits, metamaterials, etc. In this chapter, we present the sub-wavelength plasmonic response of Ag and Au nanoparticle-nanowire arrays and nanodot patterns which can be characterized using spectroscopic, generalized, and Mueller matrix ellipsometry modes. In particular, probing local surface plasmon resonance (LSPR), tuning LSPR by varying size, shape, particle number density, or interparticle-gap along or across the nanoparticle arrays, probing ordering of metal nanoparticles along the arrays, detecting in-plane or out-of-plane optical anisotropies, optical modelling of anisotropic systems, directional dielectric functions of anisotropic arrangement of metal nanoparticles, annealing-dependent lost-of-anisotropy are of prime interest. Introduction to Optics and Spectroscopic EllipsometryA branch of physics which deals with the light and sight is called optics. The nature and properties of light including their interaction with matter is studied under optics

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Section: Anisotropic Specimen: Au-nanoparticle Arrays On Rippled-simentioning

confidence: 98%

Section: Anisotropic Specimen: Au-nanoparticle Arrays On Rippled-simentioning

confidence: 99%

Section: Anisotropic Specimen: Au-nanoparticle Arrays On Rippled-simentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Ellipsometry Techniques and Its Advanced Applications in Plasmonics

Saini

Augustine

Sooraj

et al. 2021

Modern Techniques of Spectroscopy

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“…In 2013, checkerboard-like patterns of inverted nanopyramids were also found on crystalline Ge(100) surfaces irradiated at high substrate temperature (see Figure 1f) [56]. Because of this great versatility, both with regard to surface material and pattern type and dimensions, ion beam nanopatterning has become a widely employed technique in the fabrication of functional surfaces for applications in plasmonics [57][58][59][60], (bio)molecular sensing [61][62][63][64][65], photovoltaics [66][67][68], magnetism [69][70][71][72], and nanoelectronics [73,74]. In the remainder of this section, we will briefly summarize the mechanisms of nanoscale pattern formation during ion irradiation with a focus on aspects of high importance in biomaterials applications.…”

Section: Nanoscale Pattern Formation On Solid Surfaces During Ion Beam Irradiationmentioning

confidence: 99%

Ion Beam Nanopatterning of Biomaterial Surfaces

Yang

Keller

2021

Applied Sciences

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Ion beam irradiation of solid surfaces may result in the self-organized formation of well-defined topographic nanopatterns. Depending on the irradiation conditions and the material properties, isotropic or anisotropic patterns of differently shaped features may be obtained. Most intriguingly, the periodicities of these patterns can be adjusted in the range between less than twenty and several hundred nanometers, which covers the dimensions of many cellular and extracellular features. However, even though ion beam nanopatterning has been studied for several decades and is nowadays widely employed in the fabrication of functional surfaces, it has found its way into the biomaterials field only recently. This review provides a brief overview of the basics of ion beam nanopatterning, emphasizes aspects of particular relevance for biomaterials applications, and summarizes a number of recent studies that investigated the effects of such nanopatterned surfaces on the adsorption of biomolecules and the response of adhering cells. Finally, promising future directions and potential translational challenges are identified.

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Site‐Specific Emulation of Neuronal Synaptic Behavior in Au Nanoparticle‐Decorated Self‐Organized TiO_x Surface

Hasina,

Saini,

Kumar

et al. 2023

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Neuromorphic computing is a potential approach for imitating massive parallel processing capabilities of a bio‐synapse. To date, memristors have emerged as the most appropriate device for designing artificial synapses for this purpose due to their excellent analog switching capacities with high endurance and retention. However, to build an operational neuromorphic platform capable of processing high‐density information, memristive synapses with nanoscale footprint are important, albeit with device size scaled down, retaining analog plasticity and low power requirement often become a challenge. This paper demonstrates site‐selective self‐assembly of Au nanoparticles on a patterned TiOx layer formed as a result of ion‐induced self‐organization, resulting in site‐specific resistive switching and emulation of bio‐synaptic behavior (e.g., potentiation, depression, spike rate‐dependent and spike timing‐dependent plasticity, paired pulse facilitation, and post tetanic potentiation) at nanoscale. The use of local probe‐based methods enables nanoscale probing on the anisotropic films. With the help of various microscopic and spectroscopic analytical tools, the observed results are attributed to defect migration and self‐assembly of implanted Au atoms on self‐organized TiOx surfaces. By leveraging the site‐selective evolution of gold‐nanostructures, the functionalized TiOx surface holds significant potential in a multitude of fields for developing cutting‐edge neuromorphic computing platforms and Au‐based biosensors with high‐density integration.

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In-plane optical anisotropy and SERS detection efficiency of self-organized gold nanoparticles on silicon nanoripples: Roles of growth angle and postgrowth annealing

Cited by 32 publications

References 39 publications

Ellipsometry Techniques and Its Advanced Applications in Plasmonics

Ellipsometry Techniques and Its Advanced Applications in Plasmonics

Ion Beam Nanopatterning of Biomaterial Surfaces

Site‐Specific Emulation of Neuronal Synaptic Behavior in Au Nanoparticle‐Decorated Self‐Organized TiO_x Surface

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In-plane optical anisotropy and SERS detection efficiency of self-organized gold nanoparticles on silicon nanoripples: Roles of growth angle and postgrowth annealing

Cited by 32 publications

References 39 publications

Ellipsometry Techniques and Its Advanced Applications in Plasmonics

Ellipsometry Techniques and Its Advanced Applications in Plasmonics

Ion Beam Nanopatterning of Biomaterial Surfaces

Site‐Specific Emulation of Neuronal Synaptic Behavior in Au Nanoparticle‐Decorated Self‐Organized TiOx Surface

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Product

Resources

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Site‐Specific Emulation of Neuronal Synaptic Behavior in Au Nanoparticle‐Decorated Self‐Organized TiO_x Surface