Abstract
Semiconductor microcavities are micron scale photonic structures in which quantum wells are embedded within a high finesse Fabry-Perot cavity, the whole structure being prepared by high precision, modern crystal growth techniques [1]. In such structures vertical confinement of both excitons in the quantum wells and of light within the Fabry-Perot cavity results in strong and controllable light-matter interactions unachievable in quantum wells or bulk semiconductors. This control has opened up a new field of exciton-polariton physics, where key features of the interacting exciton-photon system can be tailored by sample design. Most importantly for the physics described here, the dispersion curves of the coupled two-dimensional (2D) exciton-photon modes, exciton-polaritons (termed cavity polaritons), differ from those of their bulk analogues since the confinement of light results in a finite energy at k=0. This property, combined with the controllable dispersion and the extremely low density of polariton states [1], has recently allowed a variety of new phenomena to be observed, including final state stimulation and a new condensed phase with macroscopic coherence, which have the potential to lead to new devices including very low threshold optical parametric oscillators and a coherent light source based on stimulated polariton scattering.
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References
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Skolnick, M.S., Tartakovskii, A.I., Butté, R., Stevenson, R.M., Baumberg, J.J., Whittaker, D.M. (2002). High Occupancy Effects and Condensation Phenomena in Semiconductor Microcavities and Bulk Semiconductors. In: Grundmann, M. (eds) Nano-Optoelectronics. NanoScience and Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-56149-8_11
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