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 16 of 16 for “"single-photon emitters"”.
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Control of Excitons and Quantum Emitters in Two-Dimensional Materials
… heterostructures and integration into various photonic circuits. Recently, single-photon emitters have been identified in an insulating hexagonal boron nitride (hBN) and semiconducting transition metal dichalcogenides (TMDs). In spite of the unique characteristics of these emitters, they suffer …
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Excitons in Two-Dimensional Materials: from Many-Body Physics to Quantum Technologies
… for applications such as sources of entangled photons. In this Thesis I show direct experimental evidence of two fundamental biexciton complexes in a monolayer of high-quality ML-WSe₂ by performing polarisation-resolved, gate-controlled and magnetic-fi eld dependent photoluminescence (PL) …
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Optical Properties of Type III-V Semiconductor Spherical Quantum Dot Heterostructures
… lasers, infrared photodetectors, and single photon emitters. One promising immediate application is QD solar cells. Proper analysis of the optical absorption characteristics in these solar cells requires a rigorous modeling of the electronic structure and optical properties of …
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Engineering the optical quality of quantum emitters in WSe₂
… novel two-dimensional platform hosting localised single photon emitters. These single photons are of particular interest as they are the building blocks for many quantum technologies including quantum communication and quantum computing. This thesis focusses on the optical properties of these …
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Developing and Characterizing Sources of Quantum States of Light: from Single Photons to Million-Photon Fock States
… Hamiltonian with a perfectly-defined photon number. Decades of research have been devoted to producing Fock states, but no known source can produce Fock states at macroscopic intensities and optical wavelengths. Such a source would revolutionize applications ranging from all-optical …
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Spectroscopy and rational chemical design of single emitters for quantum photonics
Single optical emitters have developed from study objects of fundamental photophysics and local chemical dynamics to technologically relevant building blocks in optical quantum information processing (QIP). This thesis mirrors this development by bridging classical photo-physical studies of single …
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Microscopy and Spectroscopy of Materials for Blue Single Photon Sources
… shown much interest in recent years as potential single photon emitters. The InGaN-GaN system in particular offers comparably high temperature emission, polarised emission, and access to the green and blue regions. This has the advantages of completing the visible spectrum, and being the region in …
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Quantum spins in semiconductor nanostructures: Hyperfine interactions and optical control
… for quantum information storage and sources of single-photon emission. The spin of the electron trapped in a self-assembled quantum dot can be used as a quantum bit of information for quantum technology applications. This system possesses desirable photon emission properties, including …
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Coherent photons from a solid-state artificial atom
Single spins confined in semiconductor quantum dots - artificial atoms in the solid-state - are attractive candidates for quantum mechanical bits, the fundamental units and building blocks of a quantum computer. The ability to address quantum dot spins optically allows us to initialise and …
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Three Grains, Two Photons and a Colourful Diamond
… at different scales, from bulk materials to single atoms. In this thesis, we employ several microscopy and spectroscopy techniques to investigate the local optoelectronic properties of metal halide perovskites, from thin films to large crystals, as well as to elucidate the physics of …
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Self-assembled strained nanostructures for light emission grown using molecular beam epitaxy
… for applications in dislocation-resistant light emitters for photonic integrated circuits, quantum computing and single photon emitters. The 0D nanostructures include quantum dots (QDs), dot in a well (DWELLs), sub-monolayer QDs and droplet epitaxy QDs, while 1D elongated structures include …
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Zinc oxide nanophotonics : toward quantum photonic technologies
… and is a good candidate for short wavelength photonic devices such as laser diodes. A large exciton binding energy (60 meV) at room temperature in addition to the advantages of being able to grow various nanostructure forms have made ZnO suitable for a wide range of applications in …
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Electron beam processing and spectroscopic characterisation of 2D materials and novel nanostructures
… flexible electronics, sub-diffractional nanophotonic devices, strain engineered variable sensors and robust quantum information processing systems. To take advantage of these unique properties a greater understanding of the underlying chemical mechanisms involved in the …
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Optimisation, Stabilisation, and Localisation of Quantum Emitters in Layer-Engineered Hexagonal Boron Nitride
… The discovery of its ability to host quantum emitters from defect sites within its crystal structure has stimulated a recent increase in publications exploring their properties. The large bandgap hBN possesses, so juxtaposed to the conductive properties of graphene, and its ability to host …
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Visible Emitters in Hexagonal Boron Nitride as an Optically Addressable Spin Qubit Platform
… in solid-state systems serve as excellent spin-photon interfaces, a crucial building block for quantum technologies such as information networks and sensing. This thesis presents a new spin qubit platform: visible emitters embedded in epitaxially grown hexagonal boron nitride (hBN) films, …
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Interactions of Organic Fluorophores with Plasmonic Surface Lattice Resonances
… solar cells, which was shown to improve the photonic efficiency and overall performance of a solar cell based on a 100-nm-thick amorphous silicon active layer at the angles-of-incidence and wavelengths that were resonant with the SLR<sup>9,10</sup>.</p> <p>This last report is significant, in …