Coexistence of classical and quantum plasmonics in large plasmonic structures with subnanometer gaps

Kadkhodazadeh, Shima; Wagner, Jakob Birkedal; Kneipp, Harald; Kneipp, Katrin

doi:10.1063/1.4819163

Cited by 40 publications

(62 citation statements)

References 27 publications

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“…Ab initio approaches show a crossing from the classical hybridization of localized surface plasmon resonances to tunnelling-mediated charge-transfer plasmons (CTPs) 36,[48][49][50] . Being able to push experiments into this intriguing regime 13,30,51 , commonly associated with expectations of quantum physics, leaves an open question: Can this regime be adequately described with semiclassical models? While non-local response within the hydrodynamic semiclassical model has been found unsuccessful in explaining features from TD-DFT [48][49][50] , there have been phenomenological attempts of classically modelling the crossover regime.…”

Section: Resultsmentioning

confidence: 99%

“…We note that, for gB0, the diffusive broadening is so strong that only higher-order modes persist (as the induced surface charge is located away from the contact point), while both BDP and the CTP are strongly suppressed. This makes a discussion on their possible coexistence problematic 51 . Finally, we note that in the anticipated tunnelling regime the extinction spectra are strongly broadened by the complex non-local response.…”

Section: Resultsmentioning

confidence: 99%

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A generalized non-local optical response theory for plasmonic nanostructures

et al. 2014

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Metallic nanostructures exhibit a multitude of optical resonances associated with localized surface plasmon excitations. Recent observations of plasmonic phenomena at the sub-nanometre to atomic scale have stimulated the development of various sophisticated theoretical approaches for their description. Here instead we present a comparatively simple semiclassical generalized non-local optical response theory that unifies quantum pressure convection effects and induced charge diffusion kinetics, with a concomitant complex-valued generalized non-local optical response parameter. Our theory explains surprisingly well both the frequency shifts and size-dependent damping in individual metallic nanoparticles as well as the observed broadening of the crossover regime from bondingdipole plasmons to charge-transfer plasmons in metal nanoparticle dimers, thus unravelling a classical broadening mechanism that even dominates the widely anticipated short circuiting by quantum tunnelling. We anticipate that our theory can be successfully applied in plasmonics to a wide class of conducting media, including doped semiconductors and low-dimensional materials such as graphene.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A generalized non-local optical response theory for plasmonic nanostructures

et al. 2014

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“…92,93,178 These unphysical attributes of the LRA are corrected in DFT 65,67,126,127,170 and hydrodynamic 88,92,93 approaches due to the inclusion of nonlocal response and electron spill-out (only DFT). Recent measurements on dimers with subnanometer gaps using both optical techniques 19,22,23,25 and EELS 18,179 show lack of agreement with the LRA, and, in the touching case, also display limits on the resonance energies of the bonding plasmon modes. However, due to the indirect nature of the measurements the explanation for the discrepancy between LRA and the observed measurements is not conclusive with possible interpretations being provided from both quantum tunneling 65,126 and nonlocal response 69 perspectives.…”

mentioning

confidence: 99%

Nonlocal optical response in metallic nanostructures

Raza

Bozhevolnyi

Wubs

et al. 2015

J. Phys.: Condens. Matter

371

461

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This review provides a broad overview of the studies and effects of nonlocal response in metallic nanostructures. In particular, we thoroughly present the nonlocal hydrodynamic model and the recently introduced generalized nonlocal optical response (GNOR) model. The influence of nonlocal response on plasmonic excitations is studied in key metallic geometries, such as spheres and dimers, and we derive new consequences due to the GNOR model. Finally, we propose several trajectories for future work on nonlocal response, including experimental setups that may unveil further effects of nonlocal response.

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“…The classical electromagnetic theory even predicts an ultrahigh near-field enhancement when the two nanostructures approach each other and form an ultra-small gap [78]. Recent experiments [79][80][81][82][83][84][85] and theoretical simulations [86][87][88][89][90][91] show that the quantum effects [92][93][94][95][96][97] such as quantum tunneling and nonlocal effects would prominently reduce the near-field enhancement.…”

Section: Nanoantenna As a Receivermentioning

confidence: 99%

Nanoantenna effect of surface-enhanced Raman scattering: managing light with plasmons at the nanometer scale

2016

Advances in Physics: X

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Manipulating light on the nanometer scale is a challenging topic not only from a fundamental point of view, but also for applications aiming toward the design of miniature optical devices. Nanoplasmonics is a rapidly emerging branch of photonics, which offers variable means to manipulate light using surface plasmon excitations on metal nanostructures. As a spectroscopic phenomenon discovered nearly 40 years ago, surface-enhanced Raman scattering (SERS) has been an active topic of fundamental and applied researches. The dominating electromagnetic enhancement in SERS is caused by surface plasmon resonances. This is a typical example of manipulating light intensity with plasmons. Here, we will review the recent SERS studies related to nanoantenna effects on different metal nanostructures based on electromagnetic enhancement. Three aspects will be the focus in this paper: (1) the coupled nanostructures which act as receiving and emitting antenna that can generate enormous SERS enhancement ~E4 even enough for single molecule SERS. (2) The polarization of SERS at the single molecule limit, including the linear and circular polarizations can be manipulated using designed asymmetric antennas. Such an effect can make the traditional 1/2 and 1/4 wave plates miniaturized to the nanometer scale. (3) Combining nanoantenna and waveguiding effects, remote excitation of SERS can be realized, which may open a new area of single molecule SERS on nanophotonic circuits.

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Coexistence of classical and quantum plasmonics in large plasmonic structures with subnanometer gaps

Cited by 40 publications

References 27 publications

A generalized non-local optical response theory for plasmonic nanostructures

A generalized non-local optical response theory for plasmonic nanostructures

Nonlocal optical response in metallic nanostructures

Nanoantenna effect of surface-enhanced Raman scattering: managing light with plasmons at the nanometer scale

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