Active quantum plasmonics

Marinica, Dana Codruta; Zapata, Mario; Nordlander, Peter; Kazansky, A. K.; Echenique, Pedro M.; Aizpurua, Javier; Borisov, Andrei G.

doi:10.1126/sciadv.1501095

Cited by 76 publications

(61 citation statements)

References 60 publications

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“…Lastly we will briefly discuss what we think are the future directions of quantum plasmonics. Unfortunately, we will not have the space to discuss many interesting topics that may deserve to fall under the title of 'quantum plasmonics', some notable omissions include quantum emitters near plasmonic structures [106], graphene plasmonics [74], semiconductor plasmonics [90], hot electrons [24] and active quantum plasmonics [97] .…”

Section: Introductionmentioning

confidence: 99%

Quantum Plasmonics

Fitzgerald

Narang²,

Craster

et al. 2016

Proc. IEEE

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Quantum plasmonics is an exciting sub-branch of nanoplasmonics where the laws of quantum theory are used to describe light-matter interactions on the nanoscale. Plasmonic materials allow extreme sub-diffraction confinement of (quantum or classical) light to regions so small that the quantization of both light and matter may be necessary for an accurate description. State of the art experiments now allow us to probe these regimes and push existing theories to the limits which opens up the possibilities of exploring the nature of many-body collective oscillations as well as developing new plasmonic devices, that use the particle quality of light and the wave quality of matter, and have a wealth of potential applications in sensing, lasing and quantum computing. This merging of fundamental condensed matter theory with application-rich electromagnetism (and a splash of quantum optics thrown in) gives rise to a fascinating area of modern physics that is still very much in its infancy. In this review we discuss and compare the keys models and experiments used to explore how the quantum nature of electrons impacts plasmonics in the context of quantum size corrections of localised plasmons and quantum tunnelling between nanoparticle dimers. We also look at some of the remarkable experiments that are revealing the quantum nature of surface plasmon polaritons.

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Section: Introductionmentioning

confidence: 99%

Quantum Plasmonics

Fitzgerald

Narang²,

Craster

et al. 2016

Proc. IEEE

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“…The resulting high-harmonic responses were shown to contain selective even-odd signals implying a generation of distinct on-off signals from an analog source which could be further realized as ac-dc conversion or rectification. These findings further highlight the great potential sensing devices probing ultrafast modifications in the sample, the general design of efficient circuitries, and engineering of, e.g., plasmonic and optical nanoscale devices [85][86][87][88][89].…”

Section: Discussionmentioning

confidence: 78%

Time-resolved impurity-invisibility in graphene nanoribbons

et al. 2019

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We investigate time-resolved charge transport through graphene nanoribbons supplemented with adsorbed impurity atoms. Depending on the location of the impurities with respect to the hexagonal carbon lattice, the transport properties of the system may become invisible to the impurity due to the symmetry properties of the binding mechanism. This motivates a chemical sensing device since dopants affecting the underlying sublattice symmetry of the pristine graphene nanoribbon introduce scattering. Using the time-dependent Landauer-Büttiker formalism, we extend the stationary current-voltage picture to the transient regime, where we observe how the impurity invisibility takes place at sub-picosecond time scales further motivating ultrafast sensor technology. We further characterize time-dependent local charge and current profiles within the nanoribbons, and we identify rearrangements of the current pathways through the nanoribbons due to the impurities. We finally study the behavior of the transients with ac driving which provides another way of identifying the lattice-symmetry breaking caused by the impurities. arXiv:1903.12538v1 [cond-mat.mes-hall]

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“…Surface plasmon polaritons (SPPs) are electromagnetic waves bound to and propagating along an interface between a metal and a dielectric. 1 Structures that support such SPPs are called plasmonic structures, and as they are efficient in absorbing incident light, 2,3 and capable to squeeze light below the diffraction limit, [4][5][6][7] they have attracted much attention in many research areas, as they also hold applications within solar cells, lasers, and chemical and biological sensors. [8][9][10][11] Structures with a small gap of a dielectric material sandwiched between two metal surfaces support gap plasmons, which are electromagnetic waves confined to and propagating along the gap.…”

Section: Introductionmentioning

confidence: 99%

Quantum spill-out in few-nanometer metal gaps: Effect on gap plasmons and reflectance from ultrasharp groove arrays in silver

2018

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A gap plasmon is an electromagnetic wave propagating in a gap between two noble metal surfaces. Such gap plasmons have previously been studied using only a classical description of the noble metals, but this model fails and shows unphysical behavior for sub-nanometer gaps. To overcome this problem quantum spill-out is included in this paper by applying Density-Functional Theory (DFT), such that the electron density is smooth across the interfaces between metal and air. The mode index of a gap plasmon propagating in the gap between the two metal surfaces is calculated from the smooth electron density, and in the limit of vanishing gap width the mode index is found to converge properly to the refractive index of bulk metal. When neglecting quantum spill out in this limit the mode index shows unphysical behavior and diverges instead. The mode index is applied to calculate the reflectance of an ultrasharp groove array in silver, as gaps of a few nm are found in the bottom of such grooves. At these positions the gap plasmon field is highly delocalized implying that it mostly exists in the bulk silver region where absorption takes place. Surprisingly, when the bottom width is a few nm and the effect of spill out at a first glance seems to be negligible, strong absorption is found to take place 1-2Å from the groove walls as a consequence of the dielectric function being almost zero at these positions. Hence quantum spill out is found to significantly lower the reflectance of such groove arrays in silver.

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Active quantum plasmonics

Abstract: The optical response of a metallic cavity is electrically controlled by changing the tunneling barrier with an external dc bias.

Cited by 76 publications

References 60 publications

Quantum Plasmonics

Quantum Plasmonics

Time-resolved impurity-invisibility in graphene nanoribbons

Quantum spill-out in few-nanometer metal gaps: Effect on gap plasmons and reflectance from ultrasharp groove arrays in silver

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