Signatures of Exciton Coupling in Paired Nanoemitters

Ford, Jack; Andrews, Davıd L.

doi:10.1021/jp404612r

Cited by 6 publications

(6 citation statements)

References 33 publications

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“…It is convenient, in particular for physical interpretation, to write the intensity in terms of the density matrix elements of the density operator of the two-atom system represented in the basis of the superposition (collective) states [34][35][36] |g = |g 1 |g 2 , |e = |e 1 |e 2 ,…”

Section: A Intensity Of the Radiation Fieldmentioning

confidence: 99%

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Radiation pattern of two identical emitters driven by a Laguerre-Gaussian beam: An atom nanoantenna

et al. 2015

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We study the directional properties of a radiation field emitted by a geometrically small system composed of two identical two-level emitters located at short distances and driven by an optical vortex beam, a LaguerreGaussian beam which possesses a structured phase and amplitude. We find that the system may operate as a nanoantenna for controlled and tunable directional emission. Polar diagrams of the radiation intensity are presented showing that a constant phase or amplitude difference at the positions of the emitters plays an essential role in the directivity of the emission. We find that the radiation patterns may differ dramatically for different phase and amplitude differences at the positions of the emitters. As a reults the system may operate as a two-or one-sided nanoantenna. In particular, a two-sided highly focused directional emission can be achieved when the emitters experience the same amplitude and a constant phase difference of the driving field. We find a general directional property of the emitted field that when the phase differences at the positions of the emitters equal an even multiple of π/4, the system behaves as a two-sided antenna. When the phase difference equals an odd multiple of π/4, the system behaves as an one-sided antenna. The case when the emitters experience the same phase but different amplitudes of the driving field is also considered and it is found that the effect of different amplitudes is to cause the system to behave as a uni-directional antenna radiating along the interatomic axis.

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Section: A Intensity Of the Radiation Fieldmentioning

confidence: 99%

“…The dissipative part of the master equation (10) consists of two terms corresponding to the two decay (fluorescent emission) channels [32,34]; the symmetric channel |e → |s → |g with an enhanced decay rate Γ s = Γ + Γ 12 :…”

Section: Fig 4 (Color Online)mentioning

confidence: 99%

Radiation pattern of two identical emitters driven by a Laguerre-Gaussian beam: An atom nanoantenna

et al. 2015

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“…82 Further examples can be found in the field of light-harvesting materials 83 and the interparticle transfer of excitation associated with coupled nanoantenna emission. 84 It is interesting to reflect on the changes in photon property that result from traveling through a medium with significant optical dispersion in the wavelength region of the photon. The variation in phase velocity associated with the frequency or wavelength dependence of the refractive index means that the velocity varies in a characteristic way across the absorption spectrum.…”

Section: Placing the Photon In Nanophotonicsmentioning

confidence: 99%

Photon-based and classical descriptions in nanophotonics: a review

Andrews

2014

J. Nanophoton

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Abstract. The centrality of the photon concept in modern physics is strongly evident in wide spheres of photonics and nanophotonics. Despite the resilience and persistence of earlier classical representations, there are numerous optical features and phenomena that only truly photon-based descriptions of theory can properly address. It is crucial to cast theory in terms of observables, and in this respect the quantum theory of light engages most directly and pragmatically with experiment. No other theory adequately reconciles the discreteness in energy of optical quanta, with their characteristic quantum mechanical delocalization in space. Examples of the distinctiveness of a photonic representation are to be found in nonclassical optical correlations; intensity fluctuations and phase; polarization, spin, and information content; measures of optical chirality; near-field interactions; and plasmonics. Increasingly, links between these fundamental properties and features are proving significant in the context of nanoscale interactions. Yet, even as new technologies are being built on the framework of modern photonics, a number of difficult questions surrounding the nature of the photon still remain. Both in its flourishing applications and in matters of fundamental entity, the photon is still a subject very much at the heart of current research. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…We focus on the general case of three or more (n) such emitters, centered upon a rotational symmetry axis of order n. 18 [Two nanoemitters may generate a planar phase discontinuity, but vortex emission is not possible for such a case.] 19 This configuration confers precisely equivalent electronic coupling between each adjacent pair, on the assumption that there is negligible interaction with potentially less highly symmetric surroundings. The Schoenflies point group symmetry designation of such a system is C n or C nh , 20 depending on the absence or presence, respectively, of reflection symmetry in the plane that includes the centers of each component of the array.…”

Section: Molecular Array and Symmetrymentioning

confidence: 99%

Optical vortex mode generation by nanoarrays with a tailored geometry

2014

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Light generated with orbital angular momentum, commonly known as an optical vortex, is widely achieved by modifying the phase structure of a conventional laser beam through the utilization of a suitable optical element. In recent research, a process has been introduced that can produce electromagnetic radiation with a helical wave-front directly from a source. The chirally driven optical emission originates from a hierarchy of tailored nanoscale chromophore arrays arranged with a specific propeller-like geometry and symmetry. In particular, a nanoarray composed of n particles requires each component to be held in a configuration with a rotation and associated phase shift of 2 n  radians with respect to its neighbor. Following initial electronic excitation, each such array is capable of supporting delocalized doubly degenerate excitons, whose azimuthal phase progression is responsible for the helical wave-front. Under identified conditions, the relaxation of the electronically-excited nanoarray produces structured light in a spontaneous manner. Nanoarrays of escalating order, i.e. those containing an increasing number of components, enable access to a set of topological charges of higher order. Practical considerations for the development of this technique are discussed, and potential new applications are identified.

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Signatures of Exciton Coupling in Paired Nanoemitters

Cited by 6 publications

References 33 publications

Radiation pattern of two identical emitters driven by a Laguerre-Gaussian beam: An atom nanoantenna

Radiation pattern of two identical emitters driven by a Laguerre-Gaussian beam: An atom nanoantenna

Photon-based and classical descriptions in nanophotonics: a review

Optical vortex mode generation by nanoarrays with a tailored geometry

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