Rabi oscillations in spasers during nonradiative plasmon excitation

Andrianov, E. S.; Pukhov, A. A.; Dorofeenko, A. V.; Vinogradov, A. P.; Lisyansky, A. A.

doi:10.1103/physrevb.85.035405

Cited by 35 publications

(28 citation statements)

References 30 publications

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“…The term 0 D describes pumping [21,25] and corresponds to the population inversion in the TLS in the absence of the NP. Since for small NPs (~30 nm), which we consider, the Joule losses far exceed the loss due to radiation, the latter can be neglected in calculations of 1 a τ − [26,27]. From now on, we neglect quantum fluctuations and correlations and consider ˆ( ), ( ), D t t σ and ˆ( ) a t as c-numbers.…”

Section: Equations Of Motions For a Free Spaser And A Spaser Driven Bmentioning

confidence: 99%

“…At fixed pumping, an increase of the SP amplitude is limited by Joule losses at the NP. The self-oscillating state of a spaser (spasing) occurs at exact compensation of losses with pumping [16,27]. If losses exceed the energy supplied by pumping, the stationary amplitudes of oscillations are equal to zero.…”

Section: Loss Compensationmentioning

confidence: 99%

“…If Eqs. (27) and (28) are satisfied, then the total energy transfer to the system is zero. Note that since the pumping threshold in this toy model ( 0 R Ω =) is infinity, loss compensation occurs below the pumping threshold.…”

Section: Tls Npmentioning

confidence: 99%

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Loss compensation by spasers in plasmonic systems

Andrianov¹,

Baranov²,

Pukhov³

et al. 2013

Opt. Express

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We show that in plasmonic systems, exact loss compensation can be achieved with the help of spasers pumped over a wide range of pumping values both below and above the spasing threshold. We demonstrate that the difference between spaser operation below and above the spasing threshold vanishes, when the spaser is synchronized by an external field. As the spasing threshold loses its significance, a new pumping threshold, the threshold of loss compensation, arises. Below this threshold, which is smaller than the spasing threshold, compensation is impossible at any frequency of the external field.

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Section: Equations Of Motions For a Free Spaser And A Spaser Driven Bmentioning

confidence: 99%

Section: Loss Compensationmentioning

confidence: 99%

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Loss compensation by spasers in plasmonic systems

Andrianov¹,

Baranov²,

Pukhov³

et al. 2013

Opt. Express

Self Cite

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show abstract

“…The composite material based on spasers is a new nonlinear object for research with unique features. During the period in which stationary spaser oscillations are established, a spaser undergoes Rabi oscillations 28 . Therefore, its properties can be controlled by intensity of the external optical field.…”

Section: Discussionmentioning

confidence: 99%

Forced spaser oscillations

et al. 2012

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We study oscillations of a spaser driven by an external optical wave. When the frequency of the external field is shifted from the frequency of an autonomous spaser, the spaser exhibits stochastic oscillations at low field intensity. The plasmon oscillations lock to the frequency of the external field only when the field amplitude exceeds a threshold value. We find a region of external field amplitude and the frequency detuning (the Arnold tongue) for which the spaser becomes synchronized with the external wave. We obtain the conditions upon the amplitude and frequency of the external field (the curve of compensation) at which the spaser's dipole moment oscillates with a phase shift of π relatively to the external wave. For these values of the amplitude and frequency, the loss in the metal nanoparticles within the spaser is exactly compensated for by the gain. It is expected that if these conditions are not satisfied, then due to loss or gain of energy, the amplitude of the wave travelling along the system of spasers either tends to the curve of compensation or leave the Arnold tongue. We also consider cooperative phenomena showing that in a chain of interacting spasers, depending on the values of the coupling constants, either all spasers oscillate in phase or a nonlinear autowave travels in the system. In the latter scenario, the traveling wave is harmonic, unlike excitations in other nonlinear systems. Due to the nonlinear nature of the system, any initial distribution of spaser states evolves into one of these steady states.

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“…Despite the large body of experimental research, the theoretical understanding of the spaser dynamics is still challenging. Fundamental insights on the lasing threshold conditions have been obtained by Mie theoretical approaches [15,16] and semi-classical methods [17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Energy equipartition and unidirectional emission in a spaser nanolaser

Gongora

Miroshnichenko

Kivshar

et al. 2016

Laser & Photonics Reviews

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A spaser is a nanoplasmonic counterpart of a laser, with photons replaced by surface plasmon polaritons and a resonant cavity replaced by a metallic nanostructure supporting localized plasmonic modes. By combining analytical results and first-principle numerical simulations, we provide a comprehensive study of the ultrafast dynamics of a spaser. Due to its highly-nonlinear nature, the spaser is characterized by a large number of interacting degrees of freedom, which sustain a rich manifold of different phases we discover, describe and analyze here. In the regime of strong interaction, the system manifests an irreversible ergodic evolution towards the configuration where energy is equally shared among all the available degrees of freedom. Under this condition, the spaser generates ultrafast vortex-like lasing modes that are spinning on the femtosecond scale and whose direction of rotation is dictated by quantum noise. In this regime, the spaser acquires the character of a nanoparticle with an effective spin. This opens up a range of interesting possibilities for achieving unidirectional emission from a symmetric nanostructure, stimulating a broad range of applications for nanoplasmonic lasers as unidirectional couplers and random information sources.

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Rabi oscillations in spasers during nonradiative plasmon excitation

Cited by 35 publications

References 30 publications

Loss compensation by spasers in plasmonic systems

Loss compensation by spasers in plasmonic systems

Forced spaser oscillations

Energy equipartition and unidirectional emission in a spaser nanolaser

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