Institut de Ciències Fotòniques: Enviaments recents
Ara mostrant els elements 221-240 de 269
Nonlinear pulse compression
In this thesis I investigate two methods for generating ultrashort laser pulses in spectral regions which are ordinarily difficult to achieve by the existing techniques. These pulses are specially attractive in the study ...
Dynamics of spinor fermions
Ultracold atomic gases have established themselves as quantum systems, which are clean and offer a high degree of control over crucial parameters. They are well isolated from their environment and thus offer the possibility ...
Plasmon-soliton waves in metal-nonlinear dielectric planar structures
In this PhD thesis, we study properties of stationary transverse magnetic polarized waves in structures built of a Kerr-type nonlinear dielectric layer, metal and linear dielectric layers. Although these waves, called here ...
Photonic entanglement : new sources and new applications
Non-classical correlations, usually referred as entanglement, are ones of the most studied and discussed features of Quantum Mechanics, since the initial introduction of the concept in the decade of 1930s. Even nowadays, ...
N-type bismuth sulfide coloidal nanocrystals and their application to solution-processed photovoltaic devices
Durante las últimas décadas, la energía solar fotovoltaica se ha convertido en una tecnología de creciente importancia para satisfacer las necesidades energéticas actuales sin sacrificar las futuras generaciones. Las células ...
Light harvesting in fiber array organic solar cells
Considering that the most abundant renewable energy source is the Sun, photovoltaic technology possesses one of the highest potentials to provide environmental benign and sustainable energy worldwide. Currently, most of ...
Hybrid diffuse optics for monitoring of tissue hemodynamics with applications in oncology
Noninvasive measurement of hemodynamics at the microvascular level may have a great impact on oncology in clinics for diagnosis, therapy planning and monitoring, and, in preclinical studies. To this end, diffuse optics is ...
Ultrafast optical parametric oscillators : novel systems, techniques, and concepts
In this thesis, we have demonstrated various ultrafast optical parametric oscillators (OPOs) based on different nonlinear media. The thesis consists of OPO systems, novel techniques, designs, and concepts that has facilitated ...
Quantum-based spectroscopy and efficient energy transport with biomolecules
For many years, the fields of quantum optics and biology have rarely shared a common path. In quantum optics, most of the concepts and techniques developed over the years stand for systems where only a few degrees of freedom ...
Whispering gallery microresonator for second harmonic light generation
In recent years, it has been proposed that circular microresonators may become an important element in the core of many photonic devices. The high Q-factors seen in fused silica micro-spheres and micro-toroids for light ...
Polarized super-resolution fluorescence microscopy
While super-resolution microscopy has brought a significant improvement in nano-scale imaging of molecular assemblies in biological media, its extension to imaging molecular orientation using fluorescence anisotropy has ...
Light generation and manipulation from nonlinear randomly distributed domains in SBN
Disordered media with refractive index variations can be found in the atmosphere, the ocean, and in many materials or biological tissues. Several technologies that make use of such random media, as image formation, satellite ...
Thermo-plasmonics : controlling and probing temperature on the nanometer scale
In the last decades, optics has become central in many applications in modern society. Nano-optics, which studies the behavior of light at the nanoscale, holds promise to do the same. However, when using traditional optical ...
Experimental evidence for the quantum condensation of ultracold dipolar excitons
In this thesis, we report experimental evidence of a "gray" condensate of excitons, as predicted theoretically by M. Combescot et al. Most importantly, the condensate is characterized by the macroscopic population of dark ...
Light enhancements in nano-structured solar cells
In this century some of our main issues are energy shortage and pollution. This work will briefly describe these problems, proposing a plan of action combining energy saving and different sustainable energy sources. Within ...
All optical manipulation of a single nitrogen-vacancy centre in nanodiamond
The efficient interaction of photons with single quantum emitters like nitrogen vacancy (NV) centres is essential for the elaboration of future integrated quantum optical devices. A promising strategy towards this goal ...
Development of novel imaging tools for selected biomedical applications
In the quest for better and faster images of cellular and subcellular structures, biology-oriented optical microscopes have advanced significantly in the last few decades. Novel microscopy techniques such as non-linear ...
Experimental tools for quantum networking operations with single photons and sinlge ions
One promising approach for future quantum networks is the combination of strings of trapped ions as quantum-information processors with entangled photon pairs produced by spontaneous parametric down conversion (SPDC) to ...
Dynamics of optically levitated nanoparticles in high vacuum
Nanotechnology was named one of the key enabling technologies by the European Commission and its tremendous impact was envisioned early by 20th century physicist R.Feynman in his now oft-quoted talk "Plenty of Room at the ...
Interaction-based nonlinear quantum metrology with a cold atomic ensemble
In this manuscript we present an experimental and theoretical investigation of quantum-noise-limited measurement by nonlinear interferometry, or from another perspective, quantum-noise-limited interaction-based measurement. ...
