The Purcell-Dicke effect in the emission from a coated small sphere of resonant atoms placed inside a matrix cavity

Manassah, Jamal T.

doi:10.1134/s1054660x12040123

Cited by 12 publications

(6 citation statements)

References 15 publications

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“…It is worth stressing that spin superradiance is rather different from atomic superradiance. The latter is caused by the Dicke effect [26], while the cavity Purcell effect is secondary [27][28][29]. Contrary to this, spin superradiance is completely due to Purcell effect, with the Dicke effect playing no role [30].…”

Section: Introductionmentioning

confidence: 91%

Spin superradiance by magnetic nanomolecules and nanoclusters

Yukalov

Henner

Yukalova

2015

J. Phys.: Conf. Ser.

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Spin dynamics of assemblies of magnetic nanomolecules and nanoclusters can be made coherent by inserting the sample into a coil of a resonant electric circuit. Coherence is organized through the arising feedback magnetic field of the coil. The coupling of a magnetic sample with a resonant circuit induces fast spin relaxation and coherent spin radiation, that is, superradiance. We consider spin dynamics described by a realistic Hamiltonian, typical of magnetic nanomolecules and nanoclusters. The role of magnetic anisotropy is studied. A special attention is paid to geometric effects related to the mutual orientation of the magnetic sample and resonator coil.

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Section: Introductionmentioning

confidence: 91%

Spin superradiance by magnetic nanomolecules and nanoclusters

Yukalov

Henner

Yukalova

2015

J. Phys.: Conf. Ser.

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“…It is a straightforward idea to enhance the emission of indistinguishable, symmetrically ordered emitters with a spherical nanoparticle. In the case of spherical metal nanoshells acting as concave nanoresonators around an embedded emitter ensemble, the resonance tunability can be exploited, and the strongly and uniformly enhanced EM-field inside the core can promote superradiance [ 46 , 47 , 53 , 54 ].…”

Section: Introductionmentioning

confidence: 99%

Plasmonically Enhanced Superradiance of Broken-Symmetry Diamond Color Center Arrays Inside Core-Shell Nanoresonators

et al. 2022

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Superradiance was demonstrated in broken-symmetry arrays of SiV diamond color centers embedded into concave plasmonic nanoresonators. The coupled configurations, including the diamond-silver (bare) and diamond-silver-diamond (coated) nanoresonators’ geometry parameters as well as the emitters’ azimuthal orientation and distance from the metal, were numerically optimized. An objective function consisting of the total fluorescence enhancement multiplied by the corrected emission quantum efficiency was used to design nanoresonators that promote superradiance. A larger total fluorescence enhancement was achieved via a larger number of emitters in both geometries, in coated spherical and in bare ellipsoidal nanoresonators. The superradiance performance was better in the case of a smaller number of emitters in bare spherical and coated ellipsoidal nanoresonators and in the case of a larger number of emitters in coated spherical and bare ellipsoidal nanoresonators. Ellipsoidal geometry is advantageous independent of composition and seeding. The configurations optimal for non-cooperative fluorescence enhancement and superradiance are coincidental. A radiative rate enhancement proportional to the number of emitters was found in wide spectral regions; therefore, superradiance implies N-fold enhancements coexist at excitation and emission. In ellipsoidal nanoresonators, the better superradiance achieved via a smaller quality-factor is accompanied by larger frequency pulling.

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“…The Purcell-Dicke effect was demonstrated in concave spherical nanoresonators (NRs) as well, namely in an ensemble of resonant atoms, which are embedded into a spherical dielectric core coated by a metallic shell [20,21]. Existence of one (two) superradiant modes was proven by neglecting [20] (taking into account [21]) the wavelength dependency of the optical parameters. Moreover, an array of cylindrical concave NRs embedded into a metal film was also applied to generate SR.…”

Section: Introductionmentioning

confidence: 99%

“…Switching into plasmon-mediated superradiant state via cooling was attributed to polarization phase matching of the molecular transitions in emitters embedded into a dielectric shell around a gold core [19]. It is important to notice that in all previous examples of plasmonic superradiance -except the first three cases-all emitters are in an excited, moreover in synchronized collective Dicke state [15][16][17][18][19].The Purcell-Dicke effect was demonstrated in concave spherical nanoresonators (NRs) as well, namely in an ensemble of resonant atoms, which are embedded into a spherical dielectric core coated by a metallic shell [20,21]. Existence of one (two) superradiant modes was proven by neglecting [20] (taking into account [21]) the wavelength dependency of the optical parameters.…”

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confidence: 99%

Superradiant diamond color center arrays coupled to concave plasmonic nanoresonators

Vass¹,

Szenes²,

Bánhelyi³

et al. 2019

Opt. Express

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authors equally contributed mcsete@physx.u-szeged.hu Different types of concave plasmonic nanoresonators have been optimized to achieve superradiantly enhanced emission of SiV color centers in diamond. Comparative study has been performed to consider advantages of different N number of SiV color centers, different diamond-silver (bare) and diamond-silver-diamond (coated) core-shell nanoresonator types, as well as of spherical and ellipsoidal geometry. The complete fluorescence enhancement (qualified by P x factor) monitoring and the cQE corrected quantum efficiency weighted P x cQE objective function optimization promotes to design bad-cavities for plasmonic Dicke effect. The switching into a collective Dicke state via optimized nanoresonators results in a radiated power proportional to N 2 , which manifest itself in an enhancement proportional to N both of the excitation and emission rates. Accordingly, enhancement proportional to N 2 of the P x factor and P x cQE has been reached both via four and six SiV color centers arranged in symmetrical square and hexagonal patterns inside all types of inspected nanoresonators. Coated spherical and bare ellipsoidal nanoresonators result in stronger noncooperative fluorescence enhancement, while superradiance is better achieved via bare spherical nanoresonators independently of SiV color centers number, and via coated (bare) ellipsoidal nanoresonators seeded by four (six) SiV color centers. Indistinguishable superradiant state of four color centers and line-width narrowing is achieved via bare nanoresonators. Six color centers seeded bare spherical (ellipsoidal) nanoresonators result in larger fluorescence enhancement and more significantly overridden superradiance thresholds, while having slightly more (less) pronounced badcavity characteristics. Both phenomena are simultaneously optimized in ellipsoidal bare nanoresonators embedding six color centers with a slightly larger detuning. IntroductionThe superradiance (SR) predicted first by Dicke has been thoroughly studied throughout the last half-century [1,2]. In case of cooperativity N emitters can exhibit N-times shorter radiative decay, accordingly the maximum rate of emission can be proportional to N 2 . Contradicting predictions also appeared in the primary literature regarding that the coherence can be lost within the expected superradiance lifetime caused by spatially varying frequency shift [3]. However, the principles regarding that Dicke effect can be achieved either via systems, which are initially in excited "collective Dicke" state, or via transient amplification of the photon noise, are widely accepted by the scientific community [4,5]. In sub-wavelength emitter arrays the non-uniform distribution of initial phases is the pre-condition of a superradiant burst [6]. The SR phenomenon has been widely inspected in case of various systems, which are either significantly smaller or larger than the wavelength [7]. Among large-scale superradiant systems the slab geometry with halfwavelength-scaled thickness was thoro...

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The Purcell-Dicke effect in the emission from a coated small sphere of resonant atoms placed inside a matrix cavity

Cited by 12 publications

References 15 publications

Spin superradiance by magnetic nanomolecules and nanoclusters

Spin superradiance by magnetic nanomolecules and nanoclusters

Plasmonically Enhanced Superradiance of Broken-Symmetry Diamond Color Center Arrays Inside Core-Shell Nanoresonators

Superradiant diamond color center arrays coupled to concave plasmonic nanoresonators

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