<i>In situ</i>characterization of one-dimensional plasmonic Ag nanocluster arrays

Verre, Ruggero; Fleischer, K.; Sofin, R. G. S.; McAlinden, Niall; McGilp, J. F.; Shvets, I. V.

doi:10.1103/physrevb.83.125432

Cited by 23 publications

(63 citation statements)

References 39 publications

(53 reference statements)

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“…As the deposition angle is larger than the off-cut angle, small clusters that are approximately five times smaller than the NP's on the facets appear deposited isotropically on the terraces. Their isotropic morphological distribution on the substrate will lead to a reduction in the RAS measured intensity, 14 but, as no significant optical plasmonic response arises from such clusters, they will be disregarded in the modeling.…”

Section: Methodsmentioning

confidence: 99%

“…The RAS setup follows the Aspnes two-polarizer photoelastic modulator layout. 14,22 Only the real part of the RAS signal has been recorded during the measurements in a range between 0.8 and 4.2 eV. The SE system is a Sopra Gesp 5 equipped with a Xe lamp.…”

Section: Methodsmentioning

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: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…1). [9][10][11][12][13][14] A collimated adatom flux is directed towards the steps, which act as preferential growth sites. Adatoms then diffuse along the steps and coalesce, forming NP arrays.…”

mentioning

confidence: 99%

Self-assembled broadband plasmonic nanoparticle arrays for sensing applications

Verre¹,

Fleischer²,

Ualibek³

et al. 2012

Applied Physics Letters

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Highly ordered noble metal nanoparticle (NP) arrays are produced using a glancing angle deposition on stepped substrates. The versatility of the technique is demonstrated by depositing different metals, resulting in shifts of the resonance positions. The behaviour of the NP arrays grown is predicted by a dipolar model, and it is measured using reflectance anisotropy spectroscopy (RAS). Fine tuning of the resonances can be finally realised by selecting the deposition parameters. The combined application of both RAS and deposition at glancing angles provides a unique tool to grow NP arrays with the tunable plasmonic resonances in the entire visible range. 3,4 For these spectroscopic techniques, the resonant energy of the structures needs to match the energy of the exciting laser.5 If the interparticle separation is smaller than the average NP diameter, 6 the electric field in the interstitial space is enhanced at resonance by orders of magnitude. 7The required NP arrangements can be readily obtained using lithographic techniques, 1 but these are unsuitable for the production of large scale active areas. Typical colloidal processes could be a solution, 8 but ordered deposition onto a substrate is required. The resulting optical spectra depend also on the parameters governing the coupling between NPs and on the morphology of the resulting structures. These growth methods are material specific and thus require unique preparation recipes, depending on the material utilised. Glancing angle deposition of adatoms can provide a possible solution (see Fig. 1).9-14 A collimated adatom flux is directed towards the steps, which act as preferential growth sites. Adatoms then diffuse along the steps and coalesce, forming NP arrays. This self-assembled technique is simple, easily scalable, and mainly dependent on geometrical considerations. It is then conceptually independent of the deposition material. This letter demonstrates that NP arrays of different materials can be produced using this deposition method. The resulting resonances can be tuned over the whole visible range once the material choice is combined with different deposition parameters. At the same time, reflectance anisotropy spectroscopy (RAS) can be used to monitor, in situ, the evolution of resonance profiles during the growth. Structures with a particular resonance energy suitable for enhancements spectroscopy can then be obtained following this route.Advantages in a material independent production method of NP arrays can be readily demonstrated by simulations. The anisotropic optical response can be reproduced by modelling each identical NP as a supported ellipsoid placed on a rectangular lattice. Once the dimensions involved are much smaller than the wavelength of light, the NP layer can be approximated as a continuous layer having an effective anisotropic in-plane dielectric function,where i ¼ (x,y), e s , and e m are the dielectric functions of the surrounding medium and of the metal, respectively. The standard shape depolarization factorthus taking into ac...

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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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In situcharacterization of one-dimensional plasmonic Ag nanocluster arrays

Cited by 23 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

Self-assembled broadband plasmonic nanoparticle arrays for sensing applications

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

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