Now showing items 126-145 of 242

    Nanoscale Coherent Control. Ultrafast dynamics of single molecules, individual light harvesting complexes and discrete nanoantennas at room temperature. 

    Brinks, Daan (Date of defense: 2012-10-19)

    Ultrafast pulses allow observation of molecular dynamics with femtosecond time resolution through pump probe experiments. However, averaging over an ensemble of molecules tends to wash out phase sensitive information, ...

    Nanoscale control of near-field interactions between single emitters and photonic antennas-on-probe 

    Sanz Paz, Maria (Date of defense: 2020-07-27)

    Photonic antennas are metallic (or dielectric) nanoscale structures that convert propagating light into highly confined fields, and vice versa, in analogy to common radio antennas but on nanometric scales that lead to ...

    Nanoscale spatial control of light in optical antennas 

    Volpe, Giorgio (Date of defense: 2012-05-10)

    El control dinámico y determinístico de la luz en una escala espacial por debajo de la longitud de onda es un requisito clave para ampliar los conceptos y las funcionalidades de la macro-óptica hasta la escala nanométrica. ...

    Narrowband photon pairs for atoms: high resolution spectral engineering and characterisation 

    Prakash, Vindhiya (Date of defense: 2021-12-16)

    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, ...

    New lab-on-a-chip strategies for enantio-selective and non-diffusion-limited biosensing 

    García Guirado, Jose María (Date of defense: 2018-10-30)

    The race for fast and small that drives nowadays society has also reached the field of biosensing. Looking for efficient and cost effective biosensors for applications including screening and treatment monitoring, biomolecular ...

    New laser speckle methods for in vivo blood flow imaging and monitoring 

    Valdés Escobar, Claudia Patricia (Date of defense: 2014-12-15)

    Blood flow and its regulation, as well as hemodynamics in general, are important for the health of tissues and hence the measurement of these quantities has many applications in research and clinical environments. Various ...

    New phenomena in high-quality suspended nanotube devices 

    Urgell Flores, Carlos (Date of defense: 2021-03-30)

    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 ...

    New systems for quantum nonlinear optics 

    Manzoni, Marco Tommaso (Date of defense: 2017-10-19)

    Photons travelling through free space do not interact with each other. This characteristic makes them perfect candidates to carry quantum information over long distances. On the other hand, processing the information they ...

    Noise assisted effects in physics and biophysics studied by the optical trapping technique 

    Martínez Sánchez, Ignacio A. (Date of defense: 2014-04-25)

    Almost two centuries after the first observations of Robert Brown, the study of systems ruled by noise has become a significant part of modern physics and other so diverse situations, such as the stock market, personal ...

    Nonlinear behaviour of ultracold atoms in optical dipole traps : large atomic light shifts, a quantum phase transition, and interaction-dependent dynamics 

    Coop, Simon (Date of defense: 2018-09-06)

    This thesis reports on theory and results from two experiments related to nonlinear behaviour in ensembles of optically-trapped ultracold atoms. The first experiment, performed at ICFO in Barcelona, regards the prediction ...

    Nonlinear pulse compression 

    Grün, Alexander (Date of defense: 2014-11-07)

    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 ...

    Nonlocal resources for quantum information tasks 

    Curchod, Florian John (Date of defense: 2018-10-11)

    This thesis focusses on the essential features of Quantum Theory that are systems in an entangled state and Bell nonlocal correlations. Here, we take the angle of a resource theory and are interested in understanding better ...

    Nonlocality in multipartite correlation networks 

    Würflinger, Lars Erik (Date of defense: 2013-09-18)

    Despite the success of quantum mechanics in predicting the outcomes of experiments in many branches of physics, the foundations of the theory have remained subject of research and dispute. At the basis of this struggle ...

    Novel continuous-wave infrared parametric sources and noise analysis of infrared upconversion detectors 

    Padhye, Anuja Arun (Date of defense: 2020-06-04)

    The ability to manipulate frequency of light, through parametric frequency conversion sources based on X(2) nonlinear materials, offers an effective route to spectral regions unapproachable by conventional lasers. Most ...

    Novel femtosecond optical parametric oscillators in the infrared 

    O'Donnell, Callum Francis (Date of defense: 2019-04-26)

    High-repetition-rate femtosecond laser sources are essential laboratory tools for spectroscopy, microscopy, amongst other applications. With the relative length of one femtosecond to one second being similar to the length ...

    Novel methods for plasmonic nanoparticles imaging inside cells using dark-field microscopy 

    Rodríguez Fajardo, Valeria (Date of defense: 2018-02-22)

    The potential impact of noble metal nanoparticles (NPs) in diverse fields, particularly medicine, is tremendous. However, before NPs can be routinely used in clinical practices, it is fundamental to comprehensively study ...

    Novel nonlinear frequency conversion sources in the mid-infrared 

    Wei, Junxiong (Date of defense: 2018-12-18)

    The goal of this thesis has been the development of a new class of advanced solid-state photonic sources for the mid-infrared (mid-IR) spectral regions, where there exists a severe shortage of practical coherent laser ...

    Novel planar photonic antennas to address the dynamic nanoarchitecture of biological membranes 

    Winkler, Pamina M. (Date of defense: 2020-11-27)

    The cell membrane is the encompassing protective shield of every cell and it is composed of a multitude of proteins, lipids and other molecules. The organization of the cell membrane is inextricably intertwined with its ...

    Novel pulsed optical parametric sources in the mid-infrared and the application towards high-resolution molecular spectroscopy 

    Ye, Hanyu (Date of defense: 2019-05-03)

    The mid-infrared (mid-IR) spectral region coincides with fundamental rotational-vibrational transitions of a large number of molecules in the gas phase. The strong interaction between mid-IR light sources and these gaseous ...

    Novel regimes of quantum optomechanics 

    Neumeier, Lukas (Date of defense: 2018-07-02)

    In everyday life the impact of light on the motion of mechanical objects is negligible. However, modern experiments making use of high quality optical resonators are able to observe significant effects originating from the ...