Now showing items 1-20 of 174

    Active control of surface plasmons in hybrid nanostructures 

    Randhawa, Sukanya (Date of defense: 2012-12-04)

    Plasmonics nanostructures are becoming remarkably important as tools towards manipulating photons at the nanoscale. They are poised to revolutionize a wide range of applications ranging from integrated optical circuits, ...

    All optical manipulation of a single nitrogen-vacancy centre in nanodiamond 

    Geiselmann, Michael Wolfgang (Date of defense: 2014-04-10)

    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 ...

    Atomic quantum metrology with narrowband entangled and squeezed states of light 

    Wolfgramm, Florian (Date of defense: 2012-06-29)

    The use of light, especially of laser light, is in many cases the most sensitive way to perform measurements. However, the highest sensitivity that can be achieved with laser light as probe is bounded by the standard quantum ...

    Attosecond X-ray absorption fine-structure spectroscopy in condensed matter 

    Buades, Bárbara (Date of defense: 2018-07-31)

    Attoscience aims to study electron dynamics in matter with unprecedented temporal resolution by using the shortest pulses generated on Earth. Currently, such resolution is only provided by sources that deliver attosecond ...

    Bound states in the continuum in planar anisotropic structures 

    Mukherjee, Samyobrata (Date of defense: 2021-10-05)

    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 ...

    Cavity optomechanics with optically trapped particles 

    Mestres Junqué, Pau (Date of defense: 2017-09-07)

    Optical trapping and manipulation have emerged as powerful tools to investigate single microscopic objects in a controlled environment. Using the momentum carried by light, forces can be exerted to confine and manipulate ...

    Certification of many-body systems 

    Baccari, Flavio (Date of defense: 2019-05-17)

    Quantum physics is arguably both the most successful and the most counterintuitive physical theory of all times. Its extremely accurate predictions on the behaviour of microscopic particles have led to unprecedented ...

    Characterizing entanglement and quantum correlations constrained by symmetry 

    Tura i Brugués, Jordi (Date of defense: 2015-07-20)

    Entanglement and nonlocal correlations constitute two fundamental resources for quantum information processing, as they allow for novel tasks that are otherwise impossible in a classical scenario. However, their elusive ...

    Charge carrier dynamics and interfaces in perovskite solar cells 

    Rueda Delgado, Diana Paola (Date of defense: 2019-07-30)

    Organometal halide perovskites for solar cells are hybrid semiconductors that recently have caught the attention of the scientific community due to its excellent performance and attractive optical properties. Since then, ...

    Classical and quantum aspects of the optical response at the nanoscale 

    Martínez Saavedra, José Ramón (Date of defense: 2018-12-10)

    Nanophotonics is one of today’s basic sciences and technologies: an in-depth understanding of the interaction between light and matter on the nano-scale, besides its intrinsic associated scientific interest, enables the ...

    Coherent control of nonlinear optical processes in individual nanoparticles 

    Accanto, Nicolò (Date of defense: 2016-06-16)

    Nanophotonics aims to understand and control the interaction of light-matter at the nanometer scale. Boosted by the development of nanotechnology and nanofabrication, nanophotonics is a thriving research field, with ...

    Coherent sensing of magnetic waveforms with spin-squeezed atoms 

    Martin Ciurana, Ferran (Date of defense: 2017-12-14)

    Optical magnetometers use magnetically-sensitive atomic ensembles and optical read-out to detect the amplitude of magnetic fields. They have become the most sensitive instruments for measuring low-frequency magnetic fields ...

    Continuous-wave optical parametric oscillators and frequency conversion sources from the ultraviolet to the mid-infrared 

    Devi, Kavita (Date of defense: 2013-10-24)

    High-power, continuous-wave (cw) optical parametric oscillators (OPOs), from the ultraviolet (UV) and visible to the near- and mid-infrared (IR) wavelength range, are of interest for a variety of applications such as ...

    Contributions to nanophotonics: linear, nonlinear and quantum phenomena 

    Roque Fernández, Pablo Manuel de (Date of defense: 2022-10-18)

    (English) Nanophotonics can be defined as the science and technology studying the control optical fields at the nanoscale and their interaction with matter. In order to spatially control such fields we would need structures ...

    Controlling the multipolar interference of nanoantennas 

    Hancu, Ion Michael (Date of defense: 2019-01-18)

    The emission and detection of light is a main pillar of both fundamental research and the advancement of modern technologies. From digital communications and quantum computing to novel cancer treatments and faded jeans, ...

    Correlates of cerebral vasoreactivity measured by non-invasive diffuse optical measurements as biomarkers of brain injury risk 

    Gregori Pla, Clara (Date of defense: 2019-03-06)

    I have used and developed a practical new platform in the clinics for the noninvasive estimation of cerebral hemodynamics. The latform combines two diffuse optical techniques: near-infrared spectroscopy and diffuse ...

    Demonstration of new experimental schemes for imaging and sensing: from quantum to classical and back 

    Urrego González, Daniel Fernando (Date of defense: 2023-11-14)

    (English) This Ph.D. thesis presents research in imaging and optical sensing, exploring novel concepts, and diverse applications. The experimental schemes put forward here are based on simulating specific aspects of quantum ...

    Detection of a single erbium ion in a nanoparticle 

    Deshmukh, Chetan (Date of defense: 2022-04-29)

    Encoding information into quantum mechanical properties of a system can lead to applications many fields, including computing and communication. Devices that will enable these applications could be part of a quantum network ...

    Detection of particles, bacteria and viruses using consumer optoelectronic components 

    Hussain, Rubaiya (Date of defense: 2022-07-01)

    The focus of this thesis is on the design, development and validation of two novel photonic sensors for the detection and characterisation of industrial and biological samples. The first one is a PSA in a collimated beam ...

    Deterministic control of nanoantenna and single-photon emitter interaction at the nanoscale 

    Palombo Blascetta, Nicola (Date of defense: 2021-03-24)

    The study of light-matter interaction at the nanoscale is a very promising field of research, providing the possibility to manipulate the interaction with single quantum systems like single atoms, molecules, atomic defects ...