Tunable spherical graphene surface plasmon amplification by stimulated emission of radiation

Ardakani, Sadreddin Behjati; Faez, Rahim

doi:10.1117/1.jnp.13.026009

Cited by 9 publications

(5 citation statements)

References 18 publications

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“…[23] proposed a nanospaser consisting of a graphene-metal hybrid plasmon system surrounded by quantum dots. Ardakani and Faez [24] studied a spaser formed by a graphene nanosphere wrapped with two-level quantum dots. Azzam et.…”

Section: Or Electrically By Charge Carriers Injection Into a Semicond...mentioning

confidence: 99%

Terahertz lasing conditions of radiative and nonradiative propagating plasmon modes in graphene-coated cylinders

Prélat¹,

Passarelli²,

Bustos-Marun³

et al. 2022

Preprint

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There is increasing interest in filling the gap of miniaturized terahertz/mid-infrared radiation sources and, particularly, in incorporating these sources into micro/nanophotonic circuits. By using rigorous electromagnetic methods, we investigate the lasing conditions and the electric-tunability of radiative and non radiative propagating surface-plasmon modes in cylinders made of active materials coated with a graphene layer. A detailed analysis of the lasing condition of different surface-plasmon modes shows that there is an abrupt change in the gain required when modes become nonradiative. Although radiative modes, subject to both radiation and ohmic losses, are expected to require more gain compensation than nonradiative modes, we find that, counterintuitively, gain compensation is greater for nonradiative modes. This is explained in terms of a change in the distribution of fields that occurs when the character of modes switches from plasmonic to photonic. Finally, we assess the feasibility of our proposal by using a realist gain medium and showing that a relatively low population inversion is required for the stimulated emission of the studied system.

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Section: Or Electrically By Charge Carriers Injection Into a Semicond...mentioning

confidence: 99%

Terahertz lasing conditions of radiative and nonradiative propagating plasmon modes in graphene-coated cylinders

Prélat¹,

Passarelli²,

Bustos-Marun³

et al. 2022

Preprint

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show abstract

“…[ 150 ] A tunable spaser based on graphene nanosphere and quantum dot array has been shown to be high confinement and large lifetime. [ 151 ] The graphene supports LSP and the quantum dot array is the gain medium. Quantum mechanics can be used to analyze the structure, and the optimal geometric and material parameters of spaser can be found by the calculation of localized fields and the matrix elements.…”

Section: Nanolasers With Different Cavities Based On 2d Materialsmentioning

confidence: 99%

Nanolasers Based on 2D Materials

Sun

et al. 2020

Laser & Photonics Reviews

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Nanolasers, with small footprint and ultralow threshold, are promising for applications in data communication, on-chip optical computing, and optical interconnects. In addition to the microcavity design, the choice of gain material is another critical factor determining the optical performance of nanolasers. 2D materials are widely studied and applied in nanoscale optoelectronic devices due to their exceptional electrical, chemical, thermal, and optical properties caused by the unique layered structures. As emerging materials with unique optical properties, 2D materials are selected as effective gain materials for designing of nanolasers. In this review, the recent advances in nanolasers based on 2D materials are comprehensively addressed.

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“…Regarding spherical geometries, in Ref. [16], a spaser formed by a graphene nano-sphere wrapped with two-level quantum dots was theoretically studied. In particular, the authors evaluate the ability of the system to launch surface plasmons on a flat graphene sheet placed close to the sphere.…”

Section: Introductionmentioning

confidence: 99%

Spaser and optical amplification conditions in graphene-coated active wires

et al. 2021

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This work analyzes the optical properties of a localized surface plasmon (LSP) spaser made of a dielectric active wire coated with a graphene monolayer. Our theoretical results, obtained by using rigorous electromagnetic methods, illustrate the non-radiative transfer between the active medium and the LSPs of graphene. In particular, we focus on the lasing conditions and the tunability of the LSP spaser in two cases: when the wire is made of an infrared/terahertz transparent dielectric material and when it is made of a metal-like material. We analyze the results by comparing them with analytical expressions obtained by using the quasistatic approximation. We show that the studied systems present a high tunability of the spaser resonances with the geometrical parameters as well as with the chemical potential of graphene.

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Tunable spherical graphene surface plasmon amplification by stimulated emission of radiation

Cited by 9 publications

References 18 publications

Terahertz lasing conditions of radiative and nonradiative propagating plasmon modes in graphene-coated cylinders

Terahertz lasing conditions of radiative and nonradiative propagating plasmon modes in graphene-coated cylinders

Nanolasers Based on 2D Materials

Spaser and optical amplification conditions in graphene-coated active wires

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