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Title: Light emission in complex networks from single-photons to lasing
Author: Gaio, Michele
ISNI:       0000 0004 6349 3420
Awarding Body: King's College London
Current Institution: King's College London (University of London)
Date of Award: 2016
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Light-matter interaction, which is at the heart of the science and technology of light, can be controlled and designed in materials structured at the nanometre length-scale, for enhanced light emission and absorption, and down to the single photon level. The aim of this thesis is to investigate complex photonic geometries, i.e. systems where the collective interaction of a large number of constituents denes the optical properties with emergent phenomena beyond the sum of the response of the individual constituents. In particular, a central topic is the emission of light from sources located in dielectric and plasmonic networks with dierent degree of disorder and correlation. Experimental and theoretical evidence of coupling of single photons to propagating modes in nano-waveguides, emission enhancement in plasmonic structures, and collective emission in disordered lasing systems are presented. Large coupling of individual quantum dots embedded in free-standing sub-wavelength waveguides is experimentally demonstrated. These waveguides are fabricated by electrospinning, a scalable technique suitable for the realisation of large interconnected systems. Light emission enhancement is investigated in plasmonic self-assembled systems and lithographic structures, which build on the framework of optical antennas and allows isolating local and global contributions to the local density of states around a topological percolation phase transition. One of the most important cooperative eects between multiple emitters is lasing. Random lasing is investigated numerically and experimentally in diusive systems with particular attention to the spectral properties of the emission and its relation with the physical and chemical parameters of the surrounding environment, which can be exploit to tune the lasing emission, thus providing a novel sensing scheme. These results provide the building blocks to construct a photonic network of emitters coupled by simple optical links.
Supervisor: Sapienza, Riccardo Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available