Temporal control of graphene plasmons

Wilson, Josh; Santosa, Fadil; Min, Misun; Low, Tony

doi:10.1103/physrevb.98.081411

Cited by 32 publications

(17 citation statements)

References 39 publications

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“…We proposed several graphene spontaneous PDC and FWM devices which have promising quantum information applications as efficient sources of entangled plasmon pairs, photon-plasmon converters and parametric plasmon amplifiers [75][76][77][78][79], etc.…”

Section: Discussion and Experimental Outlookmentioning

confidence: 99%

Graphene as a source of entangled plasmons

Sun,

Basov,

Fogler

2021

Preprint

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We analyze nonlinear optics schemes for generating pairs of quantum entangled plasmons in graphene. We predict that high plasmonic field concentration and strong optical nonlinearity of monolayer graphene enables pair-generation rates much higher than those of conventional photonic sources. The first scheme we study is spontaneous parametric down conversion in a graphene nanoribbon. In this second-order nonlinear process a plasmon excited by an external pump splits into a pair of plasmons, of half the original frequency each, emitted in opposite directions. The conversion is activated by applying a dc electric field that induces a density gradient or a current across the ribbon. Another scheme is degenerate four-wave mixing where the counter-propagating plasmons are emitted at the pump frequency. This third-order nonlinear process does not require a symmetrybreaking dc field. We suggest nano-optical experiments for measuring position-momentum entanglement of the emitted plasmon pairs. We estimate the critical pump fields at which the plasmon generation rates exceed their dissipation, leading to parametric instabilities.

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Section: Discussion and Experimental Outlookmentioning

confidence: 99%

Graphene as a source of entangled plasmons

Sun,

Basov,

Fogler

2021

Preprint

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“…As explained in the Introduction, the time reversal of the plasmonic wave is accomplished by imposing an abrupt change in D(t). Experimental values given in [17] for two different techniques show a switching time in the range 10 −13 − 10 −14 s, which is typically shorter than τ (of the order of 10 −13 s [5]). For some time T > 0, we will consider the case…”

Section: Setupmentioning

confidence: 96%

“…is slightly different in that the temporal phases of G and H have different signs, but they do not compensate each other since one is significantly larger than then other. Indeed, using the asymptotic expressions for s + given in (12) and that of the Bessel function given in (17), the temporal phases in FE…”

Section: The Perturbed Solutionmentioning

confidence: 99%

“…In [3], this is done by shaking the water tank, which changes the velocity of the surface water waves. Another experimental procedure is proposed in [17] and is based on the following observation: it is practically feasible to vary abruptly the density of available charge carriers in a graphene sheet, and this results in a singular time perturbation in the sheet conductivity. Such a perturbation acts as an ITM, and it becomes then possible to explore how the electromagnetic field generated by a dipole located close to the sheet is time-reversed by the ITM.…”

Section: Introductionmentioning

confidence: 99%

“…This system for wave propagation is standard, see e.g. [10,1,17,16,5]. Note that while the equations are not time reversible due to the complex-valued conductivity of the sheet, the effects of irreversibility are mostly seen in a loss of amplitude of the time-reversed signal, offering therefore the possibility for sharp refocusing.…”

Section: Introductionmentioning

confidence: 99%

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Time reversal of surface plasmons

Pinaud¹

2021

Preprint

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We study in this work the so-called "instantaneous time mirrors" in the context of surface plasmons. The latter are associated with high frequency waves at the surface of a conducting sheet. Instantaneous time mirrors were introduced in [3], with the idea that singular perturbations in the time variable in a wave-type equation create a time-reversed focusing wave. We consider the time-dependent three-dimensional Maxwell's equations, coupled to Drude's model for the description of the surface current. The time mirror is modeled by a sudden, strong, change in the Drude weight of the electrons on the sheet. Our goal is to characterize the time-reversed wave, in particular to quantify the quality of refocusing. We establish that the latter depends on the distance of the source to the sheet, and on some physical parameters such as the relaxation time of the electrons. We also show that, in addition to the plasmonic wave, the time mirror generates a free propagating wave that offers, contrary to the surface wave, some resolution in the direction orthogonal to the sheet. Blurring effects due to non-instantaneous mirrors are finally investigated.

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Graphene Plasmonic Time Crystals

Kim,

2024

Physica Rapid Research Ltrs

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The concept of photonic crystals has recently been extended to the time domain and attracted great interest. Unfortunately, realizing photonic time crystals is a challenging task due to the practical difficulty in modulating dielectric constants with large modulation depth. This problem can be resolved by using graphene, the conductivity of which is tunable with significantly large contrast. In this report, graphene plasmonic time crystals, as a new kind of photonic time crystals in atomically thin two‐dimensional material, are proposed and their optical properties are investigated. Their bandstructures are analytically calculated and the propagations of graphene plasmons in temporal crystalline structures are numerically evaluated. Periodically driven by temporally modulating the Fermi energy, graphene plasmons exhibit in‐gap amplification and defects‐immune topological edge states, revealing the nature as plasmonic time crystals. Graphene plasmonic time crystals will be realized soon after this proposal due to the possibility of modulating its conductivity with large contrast by simple electrical gating.This article is protected by copyright. All rights reserved.

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Temporal control of graphene plasmons

Cited by 32 publications

References 39 publications

Graphene as a source of entangled plasmons

Graphene as a source of entangled plasmons

Time reversal of surface plasmons

Graphene Plasmonic Time Crystals

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