Programa de Doctorat en Fotònica: Recent submissions
Now showing items 81-100 of 268
Simulating a topological gauge theory in a Raman-dressed Bose-Einstein condensate
Ultracold quantum gases constitute a powerful and versatile tool to experimentally explore quantum many-body physics. This thesis presents an original contribution to the quantum simulation of gauge theories with ultracold ...
Further into the infrared with quantum dot photodetectors
In the infrared, photodetectors are the key components in a wide-variety of applications such as thermal imaging, remote sensing, spectroscopy with newer technologies added to the list such as LiDaR and deep tissue imaging. ...
Spatiotemporal organisation of protein nanoclusters in adhesion complexes
The main goal of this thesis was to contribute to the understanding of the nanoscale lateral organisation of key proteins in adhesion complexes. For this, we exploited single molecule localisation-based super-resolution ...
Photodetectors based on graphene pn-junctions for mid-infrared and terahertz range
Long wavelength light contains the infrared and terahertz (THz) spetral range of the spectrum. This wavelength range spans approximately from 1 µm to 1 mm. Several applications can be explored in this spectral range such ...
Inhomogeneity and disorder in ultrafast phase transitions
In the recent decades, there has been a surge of interest in the wide array of emergent phenomena found in strongly correlated materials. Understanding the inner workings of this type of systems is a major challenge due ...
Versatile nonlinear frequency conversion sources in the near- and mid-infrared
Tunable laser sources in different spectral regions are of interest for a variety of applications including spectroscopy, trace gas sensing, medical diagnostics, LIDAR and material processing. Existing lasers have limited ...
Optomechanical resonators based on low dimensional materials
Mechanical resonators based on low dimensional materials have attracted a lot of attention due to their remarkable properties. Their ultra-low mass and high Q factors make them exceptional sensors, offering new possibilities ...
Spinor Bose-Einstein comagnetometer and interhyperfine interactions in 87Rb
In this work we demonstrate the first realization of a comagnetormeter in the ultracold regime. In comparison to regular magnetometers, which are designed to maximize their magnetic field sensitivity, a comagnetometer uses ...
A versatile system for the study of light-matter interactions at the level of individual particles
In this thesis, a single-atom trap in a "Maltese cross'' geometry (MCG) was designed, built up and characterized. A MCG atom trap uses four in-vacuum lenses to achieve four-directional high-numerical-aperture optical ...
Witnessing non-Markovian evolutions
The formulation of quantum physics stands among the most revolutionary theories of the twentieth century. During the first decades of this century, many phenomena concerning the microscopic world were unexplained or had ...
Exploring twisted bilayer graphene with nano-optics
Nano-optics studies the behaviour of light on the nanoscale. In particular, it probes the interaction of light with objects, often of nanometre-size, and reveals fine details of the material's optical properties. Optoelectronics ...
Narrowband photon pairs for atoms: high resolution spectral engineering and characterisation
This thesis describes experimental work to generate and characterise single photons and photon pairs, with frequency content suitable for controlled interaction with cold rubidium atoms. We describe a photon-pair source, ...
Integration and electrical manipulation of single-photon sources in 2-dimensional devices
Quantum nanophotonics aims at studying the interaction between matter and single photons at the nanoscale. Nanoscopic solid state light sources can be placed in near proximity to other photonic elements to engineer their ...
The application of broadband ultrafast spectroscopy to reveal structural, magnetic and electronic dynamics in quantum materials
In the last decades, quantum materials have received much attention in the field of condensed matter physics due, in part, to their exotic properties. These are difficult to understand as they result from multiple physical ...
Bound states in the continuum in planar anisotropic structures
Bound states in the continuum (BICs) are modes that remain radiationless though they exist in the part of the spectrum that corresponds to radiating waves. They are a general wave phenomenon and following initial theoretical ...
Dynamics of quantum mixtures
At sufficiently low temperatures, fluids of bosonic particles may undergo a phase transition, below which a Bose-Einstein condensate (BEC) forms. The BEC is one of the most fundamental concepts in many-body quantum physics ...
Light harvesting and energy efficiency in perovskite solar cells and their applications
The environmental issues associated with the use of conventional fuels necessitates the utilisation of renewable energy sources, as well as the implementation of energy efficient designs, in order to decrease electricity ...
Large-scale imaging of optical antennas and single molecules
The interaction of light and matter is of crucial importance in fundamental science as well as in high-end technology. Ultimately, this concerns the interaction between a photon and a single quantum system, e.g. the ...
Quantum nonlinear optics at the single-photon level with cold Rydberg atoms
Photons are good candidates for carrying quantum information because they are very stable particles: they interact weakly with the medium and barely with each other. However, this has drawbacks when you want to process ...
New phenomena in high-quality suspended nanotube devices
Carbon nanotubes (CNTs) have attracted the attention of the scientific community since their discovery in the 90s. They are an excellent material for the development of research fields as diverse as nanomechanics or quantum ...
