Polaritonic devices

Liew, Timothy Chi Hin; Shelykh, I. A.; Malpuech, G.

doi:10.1016/j.physe.2011.04.003

Cited by 119 publications

(100 citation statements)

References 205 publications

Supporting

Mentioning

100

Contrasting

Order By: Relevance

“…[4][5][6][7][8] The strong coupling regime gives rise to excitonpolaritons (for simplicity, polaritons), whose light mass and integer spin facilitates condensation at elevated temperatures. 9,10 The excitonic fraction leads to strong carrier-carrier interactions 11 and sensitivity to gating electromagnetic fields.…”

mentioning

confidence: 99%

Spin selective filtering of polariton condensate flow

Gao

Antón

Liew

et al. 2015

Applied Physics Letters

View full text Add to dashboard Cite

Spin-selective spatial filtering of propagating polariton condensates, using a controllable spin-dependent gating barrier, in a one-dimensional semiconductor microcavity ridge waveguide is reported. A nonresonant laser beam provides the source of propagating polaritons, while a second circularly polarized weak beam imprints a spin dependent potential barrier, which gates the polariton flow and generates polariton spin currents. A complete spin-based control over the blocked and transmitted polaritons is obtained by varying the gate polarization. The generation of spin currents from the passage of electrons through ferromagnets is an important building-block for spintronic devices. For example, magnetic random access memory has developed from the spin valve concept, in which the current through a pair of ferromagnets is strongly attenuated when the magnets have opposite orientations. 1 This principle has a striking analogy in optics, where the attenuation of light passing through crossed polarizes also leads to information processing devices such as spatial light modulators based on liquid crystals. 2 Indeed analogies between spintronics and optics led to the emerging field of spinoptronics, 3 aiming to exploit a hybridization of the different fields.This hybridization is well illustrated by semiconductor microcavities in the strong coupling regime, which have become a promising basis for all-optical devices and circuits. [4][5][6][7][8] The strong coupling regime gives rise to excitonpolaritons (for simplicity, polaritons), whose light mass and integer spin facilitates condensation at elevated temperatures. 9,10 The excitonic fraction leads to strong carrier-carrier interactions 11 and sensitivity to gating electromagnetic fields. 12 At the same time, the photonic fraction allows the spin state of the polariton to be directly imprinted onto the polarization of the emitted light. An advantage over conventional spintronic devices is that, being neutral particles, polaritons do not experience strong dephasing due to Coulomb scattering and the coherent propagation of spin currents can be achieved over hundreds of microns. 13 Optically controlled carrier-carrier interactions in strongly coupled semiconductor microcavities have been shown to be a highly effective tool in the engineering of polaritons' energy landscapes, 14 for both the study of polariton condensate phenomena [15][16][17][18] and the realization of nascent polariton devices. [19][20][21][22][23][24] The interaction strength is spin dependent; 25-27 excitons with parallel spins experience a repulsive force, while the interaction between excitons with anti-parallel spin is weaker and can be attractive in nature. 28 In this work, we show that these anisotropic interactions allow the construction of a photonic analogue of current spin polarization as in a ferromagnet. Namely, we demonstrate spin polarization control of a polariton condensate signal using an optical gate in a high-finesse microcavity ridge. A schematic of the device is shown in Fig. 1(a)

show abstract

mentioning

confidence: 99%

Spin selective filtering of polariton condensate flow

Gao

Antón

Liew

et al. 2015

Applied Physics Letters

View full text Add to dashboard Cite

show abstract

“…Polaritonics -an area of physics which combines condensed matter physics and quantum optics 11,12 -offers new possibilities. For instance, a THz emitter based on transitions between upper and lower polariton branches was considered in Refs.…”

Section: Introductionmentioning

confidence: 99%

Continuous terahertz emission from dipolaritons

et al. 2013

View full text Add to dashboard Cite

We propose a scheme of continuous tunable THz emission based on dipolaritons -mixtures of strongly interacting cavity photons and direct excitons, where the latter are coupled to indirect excitons via tunnelling. We investigate the property of multistability under continuous wave (CW) pumping, and the stability of the solutions. We establish the conditions of parametric instability, giving rise to oscillations in density between the direct exciton and indirect modes under CW pumping. In this way we achieve continuous and tunable emission in the THz range in a compact single-crystal device. We show that the emission frequency can be tuned in a certain range by varying an applied electric field and pumping conditions. Finally, we demonstrate the dynamic switching between different phases in our system, allowing rapid control of THz radiation.

show abstract

“…14 This is a consequence of the small effective mass of polaritons which allows a pronounced manifestation of quantum collective phenomena for a critical temperature around 20 K in CdTe structures 10 and even at room temperatures in wide-band-gap materials with large exciton binding energy and strong light-matter interaction (GaN, ZnO). 15,16 Additionally, polaritons have been proposed as basic ingredients for spinoptronic devices 17 and all-optical logical elements and integrated circuits. 18,19 While most attention in the field of exciton polaritons is drawn to two-dimensional structures, the strong light-matter interaction of excitons in one-dimensional nanowires with a confined cavity mode has also been studied.…”

Section: Introductionmentioning

confidence: 99%

One-dimensional Van Hove polaritons

et al. 2013

View full text Add to dashboard Cite

We study the light-matter coupling of microcavity photons and an interband transition in a one-dimensional (1D) nanowire. Due to the Van Hove singularity in the density of states, resulting in a resonant character of the absorption line, the achievement of strong coupling becomes possible even without the formation of a bound state of an electron and a hole. The calculated absorption in the system and corresponding energy spectrum reveal anticrossing behavior characteristic of the formation of polariton modes. In contrast to the case of conventional exciton polaritons, the formation of 1D Van Hove polaritons will not be restricted to low temperatures and can be realized in any system with a singularity in the density of states.

show abstract

Polaritonic devices

Cited by 119 publications

References 205 publications

Spin selective filtering of polariton condensate flow

Spin selective filtering of polariton condensate flow

Continuous terahertz emission from dipolaritons

One-dimensional Van Hove polaritons

Contact Info

Product

Resources

About