Creation of Orbital Angular Momentum States with Chiral Polaritonic Lenses

Dall, Robert; Fraser, Michael D.; Desyatnikov, Anton S.; Li, Guangyao; Brodbeck, Sebastian; Kamp, M.; Schneider, Christian; Höfling, Sven; Ostrovskaya, Elena A.

doi:10.1103/physrevlett.113.200404

Cited by 108 publications

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confidence: 99%

“…Polaritons form a quantum fluid, and prominent examples of observed phenomena include parametric amplification [18] and Bose condensation ([19,20] and references therein). Polaritonic quantum fluids can support vortices [21,22], and it was recently demonstrated that OAM can be transferred to polaritonic Bose-Einstein condensates using chiral polaritonic lenses [23], and that the number of vortices can be controlled by controlling the OAM of the pump beams [24,25].The question remains whether the relatively strong interaction between polaritons can be used to manipulate, in a well-controlled fashion, the orbital and/or spin angular momentum of polaritons (and thus the light field emitted from the cavity). For example, is it possible to use a beam with OAM of m p and create additional OAM contributions, say two components of OAM m 1 and m 2 , and to use the light beam characteristics of frequency and intensity to control m 1 and m 2 ?…”

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Optically Controlled Orbital Angular Momentum Generation in a Polaritonic Quantum Fluid

et al. 2017

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Applications of the orbital angular momentum (OAM) of light range from the next generation of optical communication systems to optical imaging and optical manipulation of particles. Here we propose a micron-sized semiconductor source that emits light with predefined OAM pairs. This source is based on a polaritonic quantum fluid. We show how in this system modulational instabilities can be controlled and harnessed for the spontaneous formation of OAM pairs not present in the pump laser source. Once created, the OAM states exhibit exotic flow patterns in the quantum fluid, characterized by generation-annihilation pairs. These can only occur in open systems, not in equilibrium condensates, in contrast to well-established vortex-antivortex pairs. DOI: 10.1103/PhysRevLett.119.113903 The physics of orbital angular momentum (OAM) of light has attracted considerable attention ([1-3] and references therein). The interest in the physics of OAM extends beyond the characterization and preparation of light beams with nonzero OAM, and includes such topics as rotational frequency shifts [4,5], detailed analysis of the vortex physics [6], the physics of OAM in second-harmonic generation [7,8], optical solitons with nonzero OAM [9], transfer and conservation of OAM from pump to downconverted beams [10,11], OAM conservation in degenerate four-wave mixing [12], data transmission using OAM multiplexing [13], and quantum optical aspects such as entanglement [14]. In addition, manipulation and creation of OAM states using coherence gratings [15], liquid crystals [16], and metasurfaces [17] has been reported.There is also a vast body of research on exciton polaritons in semiconductor microcavities. Here, being part of the polaritons, otherwise noninteracting photons experience effective interactions through the polaritons' excitonic component. This combines the advantages of nonlinear systems with the ease of measuring optical beams. Polaritons form a quantum fluid, and prominent examples of observed phenomena include parametric amplification [18] and Bose condensation ([19,20] and references therein). Polaritonic quantum fluids can support vortices [21,22], and it was recently demonstrated that OAM can be transferred to polaritonic Bose-Einstein condensates using chiral polaritonic lenses [23], and that the number of vortices can be controlled by controlling the OAM of the pump beams [24,25].The question remains whether the relatively strong interaction between polaritons can be used to manipulate, in a well-controlled fashion, the orbital and/or spin angular momentum of polaritons (and thus the light field emitted from the cavity). For example, is it possible to use a beam with OAM of m p and create additional OAM contributions, say two components of OAM m 1 and m 2 , and to use the light beam characteristics of frequency and intensity to control m 1 and m 2 ? The fact that rotationally symmetric states can be unstable under sufficiently large interactions is well known, and examples include spatial pattern formation in chemica...

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Optically Controlled Orbital Angular Momentum Generation in a Polaritonic Quantum Fluid

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“…[104,105]. However the principal feature of lasing by the array of dielectric spheres is that the laser beam carries the OAM without use of special chiral symmetry broken media [86,90,91].…”

Section: Summary and Discussionmentioning

confidence: 99%

“…For different types of chiral polaritonic lenses, it was shown that the near-field chirality can lead to the tailoring optical OAM in the far-field region [86,87]. There were many proposals to generate OAM beams by use of chiral plasmonic nanostructures [86], ferrite particles [88], the monolithic integration of spiral phase plates [89], chiral polaritonic lenzes [90], and by designer metasurfaces [91], etc.…”

Section: Transfer Of Sam Into Oam Of the Bsc With M =mentioning

confidence: 99%

Light Trapping above the Light Cone in One-Dimensional Arrays of Dielectric Spheres

2017

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Abstract:We demonstrate bound states in the radiation continuum (BSC) in a linear periodic array of dielectric spheres in air above the light cone. We classify the BSCs by orbital angular momentum m = 0, ±1, ±2 according to the rotational symmetry of the array, Bloch wave vector β directed along the array according to the translational symmetry, and polarization. The most simple symmetry protected BSCs have m = 0, β = 0 and occur in a wide range of the radius of the spheres and dielectric constant. More sophisticated BSCs with m = 0, β = 0 exist only for a selected radius of spheres at fixed dielectric constant. We also find robust Bloch BSCs with β = 0, m = 0. All BSCs reside within the first but below the other diffraction continua. We show that the BSCs can be easily detected by bright features in scattering of different plane waves by the array as dependent on type of the BSC. The symmetry protected TE/TM BSCs can be traced by collapsing Fano resonance in cross-sections of normally incident TE/TM plane waves. When plane wave with circular polarization with frequency tuned to the bound states with OAM illuminates the array the spin angular momentum of the incident wave transfers into the orbital angular momentum of the BSC. This, in turn, gives rise to giant vortical power currents rotating around the array. Incident wave with linear polarization with frequency tuned to the Bloch bound state in the continuum induces giant laminar power currents. At last, the plane wave with linear polarization incident under tilt relative to the axis of array excites Poynting currents spiralling around the array. It is demonstrated numerically that quasi-bound leaky modes of the array can propagate both stationary waves and light pulses to a distance of 60 wavelengths at the frequencies close to the bound states in the radiation continuum. A semi-analytical estimate for decay rates of the guided waves is found to match the numerical data to a good accuracy.

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“…Chiral trapping potentials can also be engineered to generate vortices [49]. Experiments with Mexican hat shaped profiles showed how it was possible to trap vortex-antivortex pairs [50].…”

Section: Trapping and Condensation In Structured Potentialsmentioning

confidence: 99%

Bosonic lasers: The state of the art (Review Article)

Kavokin

Liew

Schneider³

et al. 2016

Low Temperature Physics

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Bosonic lasers represent a new generation of coherent light sources. In contrast to conventional, fermionic, lasers they do not require inversion of electronic population and do not rely on the stimulated emission of radiation. Bosonic lasers are based on the spontaneous emission of light by condensates of bosonic quasiparticles. The first realization of bosonic lasers has been reported in semiconductor microcavities where bosonic condensates of exciton-polaritons first studied several decades ago by K.B. Tolpygo can be formed under optical or electronic pumping. In this paper we overview the recent progress in the research area of polaritonics, address the perspective of realization of polariton devices: from bosonic cascade lasers to spin transistors and switches.

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Creation of Orbital Angular Momentum States with Chiral Polaritonic Lenses

Cited by 108 publications

References 46 publications

Optically Controlled Orbital Angular Momentum Generation in a Polaritonic Quantum Fluid

Optically Controlled Orbital Angular Momentum Generation in a Polaritonic Quantum Fluid

Light Trapping above the Light Cone in One-Dimensional Arrays of Dielectric Spheres

Bosonic lasers: The state of the art (Review Article)

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