Controlled<i>in situ</i>growth of tunable plasmonic self-assembled nanoparticle arrays

Verre, Ruggero; Fleischer, K.; McGilp, J. F.; Fox, Daniel; Behan, G.; Zhang, Hongzhou; Shvets, I. V.

doi:10.1088/0957-4484/23/3/035606

Cited by 24 publications

(55 citation statements)

References 39 publications

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“…The average individual NP height has been estimated previously at ∼10 nm from transmission electron microscopy (TEM) studies, 15 resulting in an average layer thickness of 1 nm, for a filling factor of 0.1. For plasmonic structures such as these, the ASEF offers a simplified approach to interpreting SE measurements.…”

Section: Discussionmentioning

confidence: 97%

“…The plasmonic layer was modeled as a collection of identical ellipsoids interacting by dipolar forces and placed in a rectangular lattice on the substrate. Under these assumptions, the in-plane and out-of-plane components become, respectively, 15,30,31 …”

Section: Discussionmentioning

confidence: 99%

“…30 It is well known that this simple dipole approach overestimates the interaction with the substrate, and thus the plasmon redshift, for flattened NP's. 36,37 An analytical dipolar correction for an oblate spheroid 15,37 is applied here, as the appropriate expressions are not available for flattened ellipsoids. Sharp edges of the NP's can produce multipolar resonances, but tarnishing of the outer layer on exposure to atmosphere tends to round these away and remove discrete multipolar features, as shown previously for tarnished Ag NP's.…”

Section: Discussionmentioning

confidence: 99%

“…14,15 The pseudo-dielectric function is the dielectric response of the solid phase of a two-phase system, consisting of the solid and ambient medium, where a sharp interface is assumed [see Fig. 2(c)].…”

Section: Methodsmentioning

confidence: 99%

“…[13][14][15] The ability to tailor the surface morphologies and their optical in-plane resonances has been investigated with both polarized absorption spectroscopy in transmission and reflectance anisotropy spectroscopy (RAS), showing a strong in-plane dichroic response. Such structures are of considerable interest as they can be used for plasmon waveguides 16,17 and enhancement effects.…”

Section: Introductionmentioning

confidence: 99%

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Probing the out-of-plane optical response of plasmonic nanostructures using spectroscopic ellipsometry

Verre¹,

Fleischer²,

Smith³

et al. 2011

Phys. Rev. B

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A simplified approach to investigate the out-of-plane response of plasmonic nanostructures using spectroscopic ellipsometry (SE) is presented. One-dimensional self-assembled arrays of Ag nanoparticles (NP's) were grown on stepped Al 2 O 3 (0001), in ultrahigh vacuum, using deposition at a glancing angle. The SE response was measured with the plane of incidence aligned along, and across, the surface steps. From the raw data, an anisotropic surface excess function (ASEF) can be extracted, whose properties depend only on the dielectric function of the NP layer. Three resonances are clearly seen in the ASEF: two in-plane resonances, which correspond to the resonances measured using normal incidence reflection anisotropy spectroscopy, and the out-of-plane resonance. A dipole model is used to simulate the optical response of the NP layer, where the presence of the out-of-plane resonance provides an important additional constraint in developing the model.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Probing the out-of-plane optical response of plasmonic nanostructures using spectroscopic ellipsometry

Verre¹,

Fleischer²,

Smith³

et al. 2011

Phys. Rev. B

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Large‐Scale Fabrication of Shaped High Index Dielectric Nanoparticles on a Substrate and in Solution

Verre

Länk

Andrén

et al. 2018

Advanced Optical Materials

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enable realization of large-scale nanostructured HID materials with well-defined physical and optical properties. Electron beam lithography has been the method of choice for proof-of-concept metasurface applications, but simpler and cheaper fabrication methods are needed to upscale new ideas into commercial devices. Several such methodologies have indeed been proposed, each technique with its own advantages and drawbacks. [19] For example, dewetting [20] and laser ablation methods from bulk HID materials [6,21] can easily be upscaled, but they are difficult to control and result in a large degree of particle heterogeneity. Nanoimprint lithography [22] and laser assisted deposition [23] are more precise, but the first requires the use of expensive masks and the latter is not yet upscalable.

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Fabrication of self-organized precisely tunable plasmonic SERS substrates via glancing angle deposition

Rezvani

Ualibek

Bulfin

et al. 2017

Phys. Status Solidi A

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Plasmonic nanostructures offer great enhancement of the Raman signal due to the strong confinement of the electromagnetic field. Thus, they are considered as suitable candidates for surface enhanced Raman spectroscopy (SERS). In this work, we present an alternative fabrication route, called the glancing angle deposition (GLAD), for tunable fabrication of plasmonic self-organized Ag nanoparticle arrays aimed at SERS. Using the GLAD technique, the inter-particle distance within the arrays can be made as small as 1 nm. Moreover, the plasmonic resonance can be precisely tuned over the whole visible range. The GLAD method can be up-scaled; and when a transparent substrate is used, it enables various measurement geometries. The enhancement factor for the employed probe molecule in this study, rhodamine 6G, is estimated to be in the order of $10 8 . It is noted that the nature of the GLAD-made substrates leads to the polarization dependence of the signal enhancement. The polarization studies show a stronger enhancement along the nanoparticles chain. OriginalPaper 1700088 (7 of 8) E. Rezvani et al.: Self-organized precisely tunable plasmonic SERS substrates ß

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Controlledin situgrowth of tunable plasmonic self-assembled nanoparticle arrays

Cited by 24 publications

References 39 publications

Probing the out-of-plane optical response of plasmonic nanostructures using spectroscopic ellipsometry

Probing the out-of-plane optical response of plasmonic nanostructures using spectroscopic ellipsometry

Large‐Scale Fabrication of Shaped High Index Dielectric Nanoparticles on a Substrate and in Solution

Fabrication of self-organized precisely tunable plasmonic SERS substrates via glancing angle deposition

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