Tunable plasmons in atomically thin gold nanodisks

Manjavacas, Alejandro; Abajo, F. Javier García de

doi:10.1038/ncomms4548

Cited by 143 publications

(138 citation statements)

References 48 publications

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“…In contrast, atomically thin metals already possess a substantial conduction electron density in their undoped state, thus sustaining plasmons in the visible and near-infrared (vis-NIR), which are spectral ranges with better prospects for technological applications. Additionally, atomically thin noble metal nanoislands can undergo strong interaction with light and exhibit significant electrical tunability [53], as the doping levels that are currently attainable using gating technology can produce substantial fractional changes in the conduction electron density. Table I.…”

Section: Introductionmentioning

confidence: 99%

Plasmonics in atomically thin materials

Abajo

Manjavacas

2015

Faraday Discuss.

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The observation and electrical manipulation of infrared surface plasmons in graphene have triggered a search for similar photonic capabilities in other atomically thin materials that enable electrical modulation of light at visible and near-infrared frequencies, as well as strong interaction with optical quantum emitters. Here, we present a simple analytical description of the optical response of such kinds of structures, which we exploit to investigate their application to light modulation and quantum optics. Specifically, we show that plasmons in one-atom-thick noble-metal layers can be used both to produce complete tunable optical absorption and to reach the strong-coupling regime in the interaction with neighboring quantum emitters. Our methods are applicable to any plasmon-supporting thin materials, and in particular, we provide parameters that allow us to readily calculate the response of silver, gold, and graphene islands. Besides their interest for nanoscale electro-optics, the present study emphasizes the great potential of these structures for the design of quantum nanophotonics devices.

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Section: Introductionmentioning

confidence: 99%

Plasmonics in atomically thin materials

Abajo

Manjavacas

2015

Faraday Discuss.

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“…To compute the optical response of graphene disks in both TB and Dirac approaches, the first step is to evaluate the noninteracting polarizability [11,30]:…”

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confidence: 99%

Classical and quantum plasmonics in graphene nanodisks: Role of edge states

et al. 2014

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Edge states are ubiquitous for many condensed matter systems with multicomponent wave functions. For example, edge states play a crucial role in transport in zigzag graphene nanoribbons. Here, we report microscopic calculations of quantum plasmonics in doped graphene nanodisks with zigzag edges. We express the nanodisk conductivity σ (ω) as a sum of the conventional bulk conductivity σ B (ω), and a novel term σ E (ω), corresponding to a coupling between the edge and bulk states. We show that the edge states give rise to a redshift and broadening of the plasmon resonance, and that they often significantly impact the absorption efficiency. We further develop simplified models, incorporating nonlocal response within a hydrodynamical approach, which allow a semiquantitative description of plasmonics in the ultrasmall size regime. Furthermore, we show that the effect of hydrodynamic and edge-conductivity corrections scale identically, approximately with the inverse of the disk radius, highlighting their equatable importance. However, the polarization dependence is only given by fully microscopic models. The approach developed here should have many applications in other systems supporting edge states.

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“…Another example is the use of atomically thin gold discs for the modification of light at high speeds which has great potential for nanoscale devices. 8 Taking into account that the Casimir force between two components of a Si chip has already been measured, 9 it is important to investigate the Casimir energies and pressures for atomically thin material films, both the free-standing and deposited on a substrate.…”

Section: -5mentioning

confidence: 99%

“…This means that for atomically thin films the quantities (8) and (11) do not depend on T and have the meaning of the Casimir (van der Waals) energy per unit area of the film.…”

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Casimir and van der Waals energy of anisotropic atomically thin metallic films

Mostepanenko

2015

Phys. Rev. B

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We discuss the van der Waals (Casimir) free energies and pressures of thin metallic films, consisting from one to fifteen atomic layers, with regard to the anisotropy in their dielectric properties.Both free-standing films and films deposited on a dielectric substrate are considered. The computations are performed for a Au film and a sapphire substrate. According to our results, for free-standing Au films consisting of one and three atomic layers the respective relative error arising from the use of an isotropic (bulk) dielectric permittivity is equal to 73% and 37% for the van der Waals energy, and 70% and 35% for the pressure. We tabulate the energy and pressure van der Waals coefficients of thin Au films computed with account of their anisotropy. It is shown that the bulk permittivity of Au can be used for the films consisting of more than 30 atomic layers, i.e., more than approximately 7 nm thickness. The role of relativistic effects is also investigated and shown to be important even for the films consisting of two or three layers. The obtained results can find applications in the investigation of stability of thin films and development of novel nanoscale devices.

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Tunable plasmons in atomically thin gold nanodisks

Cited by 143 publications

References 48 publications

Plasmonics in atomically thin materials

Plasmonics in atomically thin materials

Classical and quantum plasmonics in graphene nanodisks: Role of edge states

Casimir and van der Waals energy of anisotropic atomically thin metallic films

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