Quantum effects in the optical response of extended plasmonic gaps: validation of the quantum corrected model in core-shell nanomatryushkas

Zapata, Mario; Camacho, A.; Borisov, Andrei G.; Aizpurua, Javier

doi:10.1364/oe.23.008134

Cited by 21 publications

(21 citation statements)

References 90 publications

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“…5(a)]. This approach has been employed to mimic the role of tunnelling-mediated dissipation in different geometries, such as NP aggregates [50] or nanomatryoshkas of alternating metal and dielectric layers [51].…”

Section: Theoretical Methodsmentioning

confidence: 99%

Circular Dichroism in Nanoparticle Helices as a Template for Assessing Quantum-Informed Models in Plasmonics

et al. 2018

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As characteristic lengths in plasmonics rapidly approach the sub-nm regime, quantum-informed models that can capture those aspects of the quantum nature of the electron gas that are not accessible by the standard approximations of classical electrodynamics, or even go beyond the freeelectron description, become increasingly more important. Here we propose a template for comparing and validating the predictions of such models, through the circular dichroism signal of a metallic nanoparticle helix. For illustration purposes, we compare three widely used models, each dominant at different nanoparticle separations and governed by its own physical mechanism, namely the hydrodynamic Drude model, the generalised nonlocal optical response theory, and the quantumcorrected model for tunnelling. Our calculations show that indeed, each case is characterised by a fundamentally distinctive response, always dissimilar to the predictions of the local optical response approximation of classical electrodynamics, dominated by a model-sensitive absorptive double-peak feature. In circular dichroism spectra, the striking differences between models manifest themselves as easily traceable sign changes rather than neighbouring absorption peaks, thus overcoming experimental resolution limitations and enabling efficient evaluation of the relevance, validity, and range of applicability of quantum-informed theories for extreme-nanoscale plasmonics. * Electronic address: ct@mci.sdu.dk † Electronic address: asger@mailaps.org

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Section: Theoretical Methodsmentioning

confidence: 99%

Circular Dichroism in Nanoparticle Helices as a Template for Assessing Quantum-Informed Models in Plasmonics

et al. 2018

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“…Plasmonic resonances in isolated nanoparticles under polarized electromagnetic radiation, produce a strong scattered electric field as compared to the intensity of the incident field [14,15,16,17]. This effect is promising for technological applications given that augmented fields open doors to more efficient scenarios for strong radiation-matter coupling in low dimensional semiconductor structures [18,19,20,21], and for magnified non-linearities in polar materials [22,23,24].…”

Section: Introductionmentioning

confidence: 99%

Quantum Confinement Effects on the Near Field Enhancement in Metallic Nanoparticles

et al. 2016

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In this work we study the strong confinement effects on the electromagnetic response of metallic nanoparticles. We calculate the field enhancement factor for nanospheres of various radii by using optical constants obtained from both classical and quantum approaches, and compare their size dependent features. To evaluate the scattered near field, we solve the electromagnetic wave equation within a finite element framework. When quantization of electronic states is considered for the input optical functions, a significant blue-shift in the resonance of the enhanced field is observed, in contrast to the case in which functions obtained classically are used. Furthermore, a noticeable underestimation of the field amplification is found in the calculation based on a classical dielectric function. Our results are in good agreement with available experimental reports and provide relevant information on the cross-over between classical and quantum regime, useful in potentiating nanoplasmonics applications.

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“…The QCM calculations were subsequently expanded to concentric structures consisting of Au, Al, or Na and the results were compared with those of the CEM calculations. [35][36][37][38] Kulkarni et al employed a QCM calculation to investigate the plasmon resonances of a concentric core−shell nanoparticle, in which the metallic core encapsulated in a thin silica shell. The QCM calculations of absorption cross section and the local field enhancement showed a significantly different results from the classical predictions when the spacing between core and shell was below 5 Å.…”

Section: Quantum Corrected Plasmonics With Intra-nanogap Structuresmentioning

confidence: 99%

Recent Advances in the Synthesis of Intra‐Nanogap Au Plasmonic Nanostructures for Bioanalytical Applications

Yang

Lim

2020

Advanced Materials

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frequency region (3100-3400 cm −1); therefore, the Raman spectrum of water does not interfere with the spectra of the molecules of interest, which is a critical property for bioanalytical applications. [3,4] However, the extremely low signal intensity of Raman scattering of molecules has been a major obstacle in the way of its wide application. [5] In contrast, fluorescence offers a high quantum yield in the visible region and generates high spatiotemporal images of the biological structures and functions upon appropriate modification with fluorescent dyes. The development of new optical techniques, such as confocal microscopy, total internal reflection fluorescence microscopy, and recently, super-resolution fluorescence microscopy, [6] has made it possible to obtain more detailed structural information. However, because fluorescence microscopy relies on labeling with external dye molecules, a fluorescence signal provides limited information and is prone to rapid photobleaching as major drawbacks for long-term monitoring. In the history of the development of Raman spectroscopy, two significant discoveries boosted research interest in the use of Raman scattering for practical applications. In 1973, Fleischmann et al. first reported the greatly enhanced Raman scattering intensity of pyridine molecules adsorbed on an electrochemically roughened silver surface, a technique known as surface-enhanced Raman scattering (SERS). [7] This effect was further explained by Jeanmaire and Van Duyne, who proposed an electromagnetic (EM) mechanism for the SERS. [8] The enhancement factor (EF) of the Raman signal intensity is proportional to the fourth order of the local EM field intensity (EF ∝|E| 4). [5] Albrecht and Creighton proposed that the chargetransfer effect contributes to SERS. [9] Both mechanisms are believed to be involved in enhancing the intensity of the Raman scattering spectrum. [10] Nearly 20 years later, in 1997, Nie and Kneipp independently suggested the possibility of single-molecule detection with Raman scattering from nanoparticle aggregates. [11,12] The EF values at this time were calculated to be in the range of 10 14-10 15 , which is believed to be the EF required to obtain a Raman scattering signal from a single molecule. [11,12] Zrimsek et al. and Park et al. experimentally demonstrated that an EF of ≈10 7-10 8 is sufficient to achieve single-molecule SERS. [10,13] Despite the controversy regarding the minimum EF for single molecule detection, it was clear that the presence of a Plasmonic nanogap-enhanced Raman scattering has attracted considerable attention in the fields of Raman-based bioanalytical applications and materials science. Various strategies have been proposed to prepare nanostructures with an inter-or intra-nanogap for fundamental study models or applications. This report focuses on recent advances in synthetic methods to fabricate intra-nanogap structures with diverse dimensions, with detailed focus on the theory and bioanalytical applications. Synthetic strategies ranging from the use of ...

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Quantum effects in the optical response of extended plasmonic gaps: validation of the quantum corrected model in core-shell nanomatryushkas

Cited by 21 publications

References 90 publications

Circular Dichroism in Nanoparticle Helices as a Template for Assessing Quantum-Informed Models in Plasmonics

Circular Dichroism in Nanoparticle Helices as a Template for Assessing Quantum-Informed Models in Plasmonics

Quantum Confinement Effects on the Near Field Enhancement in Metallic Nanoparticles

Recent Advances in the Synthesis of Intra‐Nanogap Au Plasmonic Nanostructures for Bioanalytical Applications

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