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Title: Engineering nonlinearities in organic and hybrid microcavities
Author: Somaschi, Niccolo
ISNI:       0000 0004 5349 1536
Awarding Body: University of Southampton
Current Institution: University of Southampton
Date of Award: 2014
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Semiconductor microcavities represent a rich playground for the investigation and exploitation of fundamental light{matter interaction as well as opto{electronic devices. Due to strong interaction of confined photons with electronic excitations new quasiparticles are formed, known as exciton{polaritons. These new eigenstates play a key role in a various number of intriguing effects like Bose-Einstein condensation and superfluidity due to their light-matter duality which unifies at the same time small effective mass and strong inter-particles interaction. Meanwhile, research achievements in the study of organic light emitting diodes and organic trasistors combined with strong advancements of the fabrication technologies has propelled the organic photonic and electronic field. In the present thesis the physics of organic microcavities is explored with particular attention at the limiting factors which prevent from the observation of cooperative non-linear phenomena. Such structural and material issues are addressed by following new engineeristic approaches. The inclusion of different organic dyes in the cavity active region is demonstrated to enhance polariton population density by direct intracavity pumping or either provide new efficient channels for particles relaxation. Inspired by a similar design, an hybrid organic{inorganic microcavity which exploits coupling of organic with inorganic quantum well excitons (Frenkel and Wannier{Mott) in a light emitting diode scheme is presented. Within this system, the optical cavity mode simultaneously couples to both excitonic transitions for the formation of mixed polariton states. The new bosonic eigenstates which arise from photon{mediated hybridiazation of Frenkel and Wannier-Mott excitons are predicted to exhibit large radius, small saturation density and large oscillator strength. Results from the optical characterization enlighten the enhancement of nonlinear properties of such hybrid polaritons while observation of strong coupling regime under electrical injection suggests the possibility for an effective exploitation of such unique polaritonic features in a electro-optic device.
Supervisor: Lagoudakis, Pavlos Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QC Physics