Exciton‐polaritons in microcavities: Recent discoveries and perspectives

Kavokin, A. V.

doi:10.1002/pssb.200983955

Cited by 24 publications

(17 citation statements)

References 43 publications

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“…1,2 In the past ten years, it has been shown that MC polaritons can be useful in a number of optoelectronic device applications as well as fundamental studies. [3][4][5][6][7] The in-plane propagation of polaritons has also recently attracted a considerable research effort: superfluid behavior of MC polaritons has been demonstrated in their coherent state 8 while bistable switching of polariton waves has been proposed as a way to achieve optical logical gates. 9 Various strategies to guide the propagation of polaritons have been theoretically proposed or experimentally demonstrated, including wire MCs, 10 or the use of metallic deposition and the creation of hybrid Tamm-like exciton-polariton states.…”

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confidence: 99%

Guided Bloch surface wave polaritons

Liscidini¹,

Gerace²,

Sanvitto³

et al. 2011

Applied Physics Letters

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The authors report on a theoretical investigation of guided polariton states arising from the strong coupling between quantum-well excitons and a Bloch surface wave confined at the interface between a uniform dielectric medium and a Bragg mirror. It is shown that the exciton–photon coupling is almost doubled as compared to a similar structure made in a conventional planar microcavity. It is also shown that, by simple engineering of the sample surface with silicon oxide deposition, one can efficiently produce one-dimensional polaritons propagating within the structure with extremely low losses. The latter result evidences the usefulness of Bloch surface waves as a key component for the realization of “polaritonic integrated circuits.”

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confidence: 99%

Guided Bloch surface wave polaritons

Liscidini¹,

Gerace²,

Sanvitto³

et al. 2011

Applied Physics Letters

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“…[1,2] Recently, polariton excitations in two-dimensional geometries have been attracting considerable interest, both for fundamental studies on out-of-equilibrium Bose-Einstein condensation and superfluidity, [3][4][5] and for the possibility to exploit their nonlinear properties for all-optical operations. [6,7] Elementary excitations can be observed in materials such as squaraine, porphyrin and cyanine dyes.…”

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Room temperature Bloch surface wave polaritons

et al. 2014

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Polaritons are hybrid light-matter quasi-particles that have gathered a significant attention for their capability to show room temperature and out-of-equilibrium Bose-Einstein condensation. More recently, a novel class of ultrafast optical devices have been realized by using flows of polariton fluids, such as switches, interferometers and logical gates. However, polariton lifetimes and propagation distance are strongly limited by photon losses and accessible in-plane momenta in usual microcavity samples. In this work, we show experimental evidence of the formation of room temperature propagating polariton states arising from the strong coupling between organic excitons and a Bloch surface wave. This result, which was only recently predicted, paves the way for the realization of polariton devices that could allow lossless propagation up to macroscopic distances.Mixed light-matter excitations, also called polaritons, arise from the non-perturbative coupling of optical transitions with large oscillator strength and electromagnetic modes propagating or confined in semiconducting or insulating media.[1, 2] Recently, polariton excitations in two-dimensional geometries have been attracting considerable interest, both for fundamental studies on out-of-equilibrium Bose-Einstein condensation and superfluidity, [3][4][5] and for the possibility to exploit their nonlinear properties for all-optical operations. [6,7] Elementary excitations can be observed in materials such as squaraine, porphyrin and cyanine dyes. As opposed to Wannier-type exciton polaritons, their ultra-high oscillator strength allows for the observation of polariton effects at room temperature and for Rabi splittings that could reach energies of the order of the excitonic transistion.So far, most of the research on polaritons, concerning both Wannier and organic types, [8,9] has been mainly focused on the strong coupling to the photonic modes of high-finesse planar microcavities, where the active medium is embedded in a cavity layer between two highreflectivity mirrors. However, planar microcavities offer little freedom in engineering the propagation of polaritons, due to their small accessible momenta. Recently, it has been suggested that similar phenomena could also be observed at the interface between a single Bragg mirror (DBR) and a homogeneous medium by exploiting strong light-matter coupling to Bloch surface waves. [10,11] Such Bloch surface wave polaritons (BSWP), [12] i.e. mixed excitations bound to the surface of the Bragg mirror,-which exploit the confinement of the optical mode due to total internal reflection as weel as a photonic bandgap-could be exploited for prospective polariton devices with high efficiency and controlled long range propagation, or for applications requiring high surface sensitivity such as optical sensors, [13,14] with clear advantages over alternative structures where metal deposition is required. [15,16] In this letter we report on the experimental demonstra- tion of strong light-matter coupling between J-aggregate ex...

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“…In 1992, it had been experimentally demonstrated by Weisbuch et al [208], that, in the strong coupling regime the interaction between the exciton state in semiconductor and confined light mode in the microcavity can lead to the formation of completely two new eigenstates which have different properties than the bare exciton or the photon states. These collective excitation comprising part-light part-matter quasiparticles are known as exciton polaritons [209]. [211,212].…”

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confidence: 99%

Flatland Nanophotonics: A Study of Quantum-Confined Excitons in 2D Materials

Chakraborty¹

2019

Frontiers in Optics + Laser Science APS/DLS

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Let us begin our journey by revisiting some of the history and fundamental properties of flatland materials-materials that are two-dimensional. In this chapter we will introduce the different types of two dimensional (2D) materials that we have studied in this work. We will also discuss some of the techniques of preparation and identification of these materials. Finally, a brief overview of the thesis will be presented.

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Exciton‐polaritons in microcavities: Recent discoveries and perspectives

Cited by 24 publications

References 43 publications

Guided Bloch surface wave polaritons

Guided Bloch surface wave polaritons

Room temperature Bloch surface wave polaritons

Flatland Nanophotonics: A Study of Quantum-Confined Excitons in 2D Materials

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