Strong Light–Matter Coupling in Carbon Nanotubes as a Route to Exciton Brightening

Abstract

We show that strong light-matter coupling can be used to overcome a long-standing problem that has prevented efficient optical emission from carbon nanotubes. The luminescence from the nominally bright exciton state of carbon nanotubes is quenched due to the fast non-radiative scattering to the dark exciton state having a lower energy.We present a theoretical analysis to show that by placing carbon nanotubes in an optical microcavity the bright excitonic state may be split into two hybrid exciton-polariton states, whilst the dark state remains unaltered. For sufficiently strong coupling between the bright exciton and the cavity, we show that the energy of the lower polariton may be pushed below that of the dark exciton. This overturning of the relative energies of the bright and dark excitons prevents the dark exciton from quenching the emission. 1 arXiv:1710.02764v2 [cond-mat.mes-hall]

Theory of nonlinear excitonic response of hybrid organic perovskites in the regime of strong light-matter coupling

“…Since the first experimental observation of cavity polaritons in GaAs based samples, where both E B and Ω R are about meV 28 , the search of the materials with more robust excitons and higher values of Ω R continues. Among the perspective candidates, one should mention wide band semiconductors, such as GaN and ZnO [29][30][31] , organic materials [32][33][34][35][36][37] , carbon nanotubes [38][39][40] and monolayers of transition metal dichalcogenides (TMD) [41][42][43][44][45][46] .…”

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Strong Plasmon–Exciton Interactions on Nanoantenna Array–Monolayer WS2 Hybrid System

“…In a weakly‐coupled system, optical processes involving light and matter are irreversible, exemplified in spontaneous emissions of quantum emitters . However, this is qualitatively different when the light–matter interaction enters the strong coupling regime, where coherent oscillations of energy between excitons and photons dominates over the electromagnetic damping, manifesting in clear spectral splitting known as the Rabi splitting . Realization of strong coupling requires a large density of photonic states, which is mainly dependent on the spatiotemporal confinement of electromagnetic fields characterized by the mode volume V and resonance Q ‐factor, LDOS ∝ Q / V .…”

“…[16][17][18][19] However, this is qualitatively different when the lightmatter interaction enters the strong coupling regime, where coherent oscillations of energy between excitons and photons dominates over the electromagnetic damping, manifesting in clear spectral splitting known as the Rabi splitting. [20][21][22][23] Realization of strong coupling requires a large density of photonic states, which is mainly dependent on the spatiotemporal confinement of electromagnetic fields characterized by the mode volume V and resonance Q-factor, LDOS ∝ Q/V. For this, many efforts have been devoted to realize photonic microcavities with high Q/V, namely, high finesse resonators based on photonic crystals [24][25][26] and whispering gallery modes.…”