Evolution of plasmonic response in growing silver thin films with pre-percolation non-local conduction and emittance drop

Earp, A.; Smith, G.B.

doi:10.1088/0022-3727/44/25/255102

Cited by 18 publications

(22 citation statements)

References 20 publications

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“…It should be noted that the obtained type B structures present certain similarity with systems showing percolation, in which an abrupt step in the electrical and optical properties takes place when metallic isolated nanostructures connect to form large networks. For those systems, the effect of charge delocalization associated with the growth and link of the isolated metallic nanostructures produces a spectral shift of the plasmonic response from the visible region to the near and mid-IR region governed by delocalized plasmons [29,30].…”

Section: Resultsmentioning

confidence: 99%

Plasmonic enhancement of second harmonic generation from nonlinear RbTiOPO_4 crystals by aggregates of silver nanostructures

Sánchez‐García¹,

Tserkezis²,

Ramı́rez³

et al. 2016

Opt. Express

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Abstract:We demonstrate a 60-fold enhancement of the second harmonic generation (SHG) response at the nanoscale in a hybrid metal-dielectric system. By using complex silver nanostructures photochemically deposited on the polar surface of a ferroelectric crystal, we tune the plasmonic resonances from the visible to the near-infrared (NIR) spectral region, matching either the SH or the fundamental frequency. In both cases the SHG signal at the metal-dielectric interface is enhanced, although with substantially different enhancement values: around 5 times when the plasmonic resonance is at the SH frequency or up to 60 times when it matches the fundamental NIR radiation. The results are consistent with the more spatially-extended near-field response of complex metallic nanostructures and can be well explained by taking into account the quadratic character of the SHG process. The work points out the potential of aggregates of silver nanostructures for enhancing optical nonlinearities at the nanoscale and provides an alternative approach for the development of nanometric nonlinear photonic devices in a scalable way. References and links1. J. A. Armstrong, N. Bloembergen, J. Ducuing, and P. S. Pershan, "Interactions between light waves in a nonlinear dielectric," Phys. Rev. 127(6), 1918-1939 (1962). 2. P. Franken, A. E. Hill, C. W. Peters, and G. Weinreich, "Generation of optical harmonics," Phys. Rev. Lett. 7(4), 118-120 (1961). 1720-1723 (2011). 9. H. Aouani, M. Rahmani, M. Navarro-Cía, and S. A. Maier, "Third-harmonic-upconversion enhancement from a single semiconductor nanoparticle coupled to a plasmonic antenna," Nat. Nanotechnol. 9(4), 290-294 (2014). 10. N. Kauranen and A. V. Zayats, "Nonlinear plasmonics," Nat. Photonics 6(11), 737-748 (2012 harmonic emission by plasmonic resonances at the second harmonic wavelength," Nano Lett. 15(6), 3917-3922 (2015).

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Section: Resultsmentioning

confidence: 99%

Plasmonic enhancement of second harmonic generation from nonlinear RbTiOPO_4 crystals by aggregates of silver nanostructures

Sánchez‐García¹,

Tserkezis²,

Ramı́rez³

et al. 2016

Opt. Express

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“…Understanding optical responses as the metal islands began to link up, was a bigger challenge with key new insights emerging quite recently [2,3]. An admix of two broad classes of LSP and an emergent Drude type response were all present in the transition zone [3], until only a Drude response occurred at sufficient mass and it evolved until all voids were filled. A major attraction has been the variety of spectral responses that resulted both at solar wavelengths and in the thermal infra-red, which could be further tuned and amplified by filling the nanovoids with dielectric.…”

Section: Introductionmentioning

confidence: 99%

“…Generic mathematical forms for resonance can often seem to fit data, but unless fitting parameters are linked to images of physical nanostructure that have evanescent fields extending far enough for hybrid effects, fitting parameters will not have a physical basis. Very strong resonances do however, occur in Ag films as percolating networks develop [3,12].…”

Section: Introductionmentioning

confidence: 99%

“…Hybrid modes are further complicated for partially percolating films where "anomalous" LSPs involving hot spots exist [3] and arise in up to three distinct ways. These may be more likely to hybridize because the initiating local resonance can be much stronger than those on isolated islands, enabling stronger evanescent coupling.…”

Section: Introductionmentioning

confidence: 99%

“…These may be more likely to hybridize because the initiating local resonance can be much stronger than those on isolated islands, enabling stronger evanescent coupling. Anomalous local modes may arise from (i) isolated islands coupled to a local network [3] (ii) hotspots within a network, due to sharp local variations in spacing between network strands [12] (iii) the "mirror" layer following the contours of the underlying nanostructure, which leads to a Babinet's core-shell or metal core-in-metal shell nanoparticle resonances [13,14]. Each case has an identifiable class of nanostructures, so that careful studies of the nanostructure are needed to check if a given resonant process is possible.…”

Section: Introductionmentioning

confidence: 99%

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Modes of interaction between nanostructured metal and a conducting mirror as a function of separation and incident polarization

et al. 2013

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The optical resonances that occur in nanostructured metal layers are modulated in thin film stacks if the nanostructured layer is separated from a reflecting conducting layer by various thicknesses of thin dielectric. We have measured and modeled the optical response of interacting silver layers, with alumina spacer thickness ranging from a few nm to 50 nm, for s-and p-polarized incident light, and a range of incident angles. Standard thin film models, including standard effective medium models for the nanostructured layer, will break down for spacer thickness below a critical threshold. For example, with polarisation in the film plane and some nano-islands, it may occur at around 10 nm depending on spacer refractive index. Of particular interest here are novel effects observed with the onset of percolation in the nanolayer. Hot spot effects can be modified by nearby mirrors. Other modes to consider include (a) a two-particle mode involving a particle and its mirror image (b) A Fano resonance from hybridisation of localized and de-localised plasmon modes (c) a Babinet's core-(partial) shell particle with metal core-dielectric shell in metal (d) spacing dependent phase modulation (e) the impact of field gradients induced by the mirror at the nano-layer.

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Hybrid Plasmonic–Ferroelectric Architectures for Lasing and SHG Processes at the Nanoscale

et al. 2019

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develop novel nanophotonic devices with innovative functions for light generation and control. Indeed, the development of coherent light sources with sub-wavelength confined modes is a flourishing area that can yield a revolution in several fields, including physics, chemistry, materials science, biology, and/or imaging and information technologies. [13][14][15][16] In this review, we discuss the progress on the fabrication and performance features of light sources operating at the nanoscale, which can be attained by the interaction of localized surface plasmons (LSP) with optical gain dielectric media. The optical gain is provided by functional ferroelectric platforms (either by stimulated emission or by nonlinear (NL) frequency conversion processes), which in turn are used as templates for the deposition of metallic arrangements. Two types of sources with sub-diffraction spatial confinement are presented: plasmon-assisted solid-state nanolasers, based on the interaction between metallic nanostructures and optically active rare earth (RE 3+ ) doped ferroelectric crystals, and NL radiation sources based on quadratic frequency mixing mechanisms, that are enhanced by means of LSP resonances.Ferroelectrics are nowadays strong actors in the area of light generation and control. In the context of this report, the relevance of employing ferroelectric crystals as optical functional platforms is multiple. On one hand, the presence of a reversible spontaneous polarization in the ferroelectric phase allows to engineer ferroelectric domain patterns with different photonic functionalities. [17][18][19][20] On the other hand, the noncentrosymmetric crystal structure of ferroelectrics enables the generation of quadratic frequency conversion processes, which makes these systems useful as frequency doublers and optical parametric oscillators. [21,22] Further, the possibility of some ferroelectric crystals to host luminescent trivalent RE 3+ ions, from which laser action can be achieved, is an additional advantage exploited in the context of this work. [23] In fact, some of the materials that will be the subject of discussion in this report constitute true solid-state lasers due to the incorporation of optically active ions such as Nd 3+ or Yb 3+ during the crystal growth. Finally, the presence of surface charges on ferroelectrics is a key factor that allows ferroelectric surfaces to act as templates to assemble different type of nanostructures Coherent light sources providing sub-wavelength confined modes are in ever more demand to face new challenges in a variety of disciplines. Scalability and cost-effective production of these systems are also highly desired. The use of ferroelectrics in functional optical platforms, on which plasmonic arrangements can be formed, is revealed as a simple and powerful method to develop coherent light sources with improved and novel functionalities at the nanoscale. Two types of sources with subdiffraction spatial confinement and improved performances are presented: i) plasmon-assisted solid-sta...

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Evolution of plasmonic response in growing silver thin films with pre-percolation non-local conduction and emittance drop

Cited by 18 publications

References 20 publications

Plasmonic enhancement of second harmonic generation from nonlinear RbTiOPO_4 crystals by aggregates of silver nanostructures

Plasmonic enhancement of second harmonic generation from nonlinear RbTiOPO_4 crystals by aggregates of silver nanostructures

Modes of interaction between nanostructured metal and a conducting mirror as a function of separation and incident polarization

Hybrid Plasmonic–Ferroelectric Architectures for Lasing and SHG Processes at the Nanoscale

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