Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Exciton-Polaritons"”.
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Nonlinear Processes in Room Temperature Exciton-Polaritons
… where hybrid light-matter states known as exciton-polaritons form, leading to enhanced light matter interaction, modified material properties, and novel quantum phenomena. In this thesis, we explore the phenomenology of exciton-polaritons in strained TMD microcavities, 2D perovskites, …
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Spin and lattice properties of optically trapped exciton polaritons
Exciton-polaritons are the fundamental excitations arising from the strong coupling of quantum well excitons and cavity photons in semiconductor microcavities. They are compound bosons for which stimulated scattering and macroscopic occupation of single quantum states can occur at sufficiently high …
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Effects of interactions on correlation, thermalization, and transport of exciton-polaritons
… explained in terms of single-particle physics. Exciton-polaritons (hereafter "polaritons") are hybrid quasiparticles in a semiconductor quantum-well microcavity that exhibit both light-matter and matter-matter interactions. Polaritons have the effective mass inherited from the ultralight cavity …
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Exciton-polaritons in thermal equilibrium : from Bose-Einstein condensation to exciton-polaritonics
… collective system, namely, microcavity exciton-polariton Bose-Einstein condensates. Microcavity exciton-polaritons, hereafter simply polaritons, are bosonic quasiparticles formed in a resonant semiconductor microcavity by coupling the excitonic polarizabilities in quantum wells to the …
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Coherently-driven exciton polaritons and directional cQED effects in the quantum dot-micropillar system
… wavelength-independent driving of the coupled exciton (X) and cavity mode (C) system, was implemented. This flexible and powerful technique enables access to the three-dimensional emission characteristics of QD-micropillars providing important new insight into cQED effects which is the central …
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Correlated exciton dynamics in semiconductor nanostructures
… fundamentally important electronic state is an exciton, an excited electron bound to a positively charged vacancy. Excitons can become correlated with other excitons, mutually influencing one another and exhibiting collective properties. The focus of this dissertation concerns the origins, …
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I. Resonant Two-Photon Reabsorption by Exciton-Polaritons in Cuprous Chloride Films. Ii. Heat Pulse Propagation Across Metal/sapphire Interfaces. Iii. Phonon Focusing in Piezoelectric Crystals
The work described in this thesis involves the study of optical and thermal properties of semiconductors and consists of three separate topics.
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DIRECT REAL-TIME REAL-SPACE IMAGING OF ENERGY TRANSPORT IN ORGANIC SEMI-CONDUCTORS
… through strong light-matter coupling to form exciton-polaritons which have transport lengths of up to 250 nm at effective velocities of up to 5x10⁶ ms⁻¹. The formation of exciton-polaritons in robust cavity-free organic semiconductors opens up doors to a new generation of light harvesting …
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Control of Nonlinear Properties of van der Waals Materials
… through the formation of hybrid quasi-particles exciton-polaritons. This thesis<br />focuses on exploring and enhancing nonlinearity of van der Waals materials through strongly coupling to microcavities. By taking advantage of the stacking order of TMDs, we show intense second-harmonic generation …
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Light-Matter Interactions in High-Efficiency Photovoltaics, Light-Emitting Devices, and Strongly Coupled Microcavities
… and two-dimensional perovskite microcavity exciton-polaritons. First, we quantify the PCE enhancements due to photon recycling in high-efficiency Cs₀.₀₅(MA₀.₁₇FA₀.₈₃)₀.₉₅Pb(I₀.₈₃Br₀.₁₇)₃ (triple-cation) perovskite thin film photovoltaics as a function of material properties such as …
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Optically nonlinear spatial and spectral processes in semiconductor microcavities
… of active material. Strong coupling between excitons residing in the active layer and photons confined within the cavity leads to new eigenstates of the system, called microcavity exciton-polaritons. The dynamics of these qnasi-bosons are stndied using a range of optical spectroscopy …
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Two classes of unconventional photonic crystals
… a three-dimensional quantum mechanical model of exciton polaritons which describes this system. Amongst other things, the model explains the reason for the resonant enhancement of the photonic bandgap, which turns out to be related to the Purcell effect. An extension of this band theoretical …
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Engineering J-aggregate cavity exciton-polariton devices
… creating light-matter quasi-particles known as exciton-polaritons, even at room temperature. In this thesis, I discuss my research on the properties of J-aggregate thin films and on advancing the device and materials engineering of strongly-coupled devices based on J-aggregate thin films to the …
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I. Resonant two-proton reabsorption by exition-polaritons in cuprous chloride films ; II. Heat pulse progration across metal/sapphire interfaces ; III. Phonon focusing in piezoelectric crystals
… topics. 1. Resonant two-photon absorption by exciton polaritons in CuCl ~. A study of the lineshape and intersity of the biexciton decay luminescerce reveals a two-photon reabsorption process in which the longitudinal exciton and the transverse polaritor act as resonant intermediate states. …
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Control of Exciton Photon Coupling in Nano-structures
<p>In this thesis, we study the interaction of excitons with photons and plasmons and methods to control and enhance this interaction. This study is categorized in three parts: light-matter interaction in microcavity structures, direct dipole-dipole interactions, and plasmon-exciton interaction in …
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Fundamental Excitations of Nonconservative Quantum Fluids
… of BEC from photonic quasiparticles known as exciton-polaritons (polaritons). These photonic condensates are free to gain or lose energy as a part of their dynamics, and are thus not constrained to tend towards thermodynamic equilibrium. This greatly increases their pattern forming …
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Unconventional computing platforms and nature-inspired methods for solving hard optimisation problems
The search for novel hardware beyond the traditional von Neumann architecture has given rise to a modern area of unconventional computing requiring the efforts of mathematicians, physicists and engineers. Many analogue physical systems, including networks of nonlinear oscillators, lasers, …
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Strongly correlated quantum fluids and effective thermalization in non-Markovian driven-dissipative photonic systems
… the precursors experiments in semiconductor exciton-polariton already allow to reach the Bose-Einstein Condensation and superfluid regimes, novel platforms such as superconducting circuits, coupled cavity arrays or photons coupled to Rydberg EIT (Electromagnetically induced Transparency) …