Exploració per tema "Fotons"
Ara es mostren els items 1-20 de 26
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A comprehensive characterisation of polarization-entangled photon pairs generated in a double-pass configuration
(Universitat Politècnica de Catalunya, 2014-07-18)
Projecte Final de Màster Oficial
Accés obert[ANGLÈS] We have investigated a highly efficient source of polarization-entangled photons for long-distance free-space communication and other experiments involving significant propagation loss. The source is an evolution ... -
Absorption spectroscopy with quantum light: experimental and theoretical simulations based on arbitrary spectral shapes generated with a programable filter
(Universitat Politècnica de Catalunya, 2023-09-06)
Projecte Final de Màster Oficial
Accés obert
Realitzat a/amb: Institut de Ciències Fotòniques (ICFO)Absorption spectroscopy is a useful technique to detect the presence of specific elements in samples. However, its usefulness can be severely limited in certain frequency bands due to technological limitations, such as the ... -
Application of Photon Strength Functions to (n,gamma) measurements with the n_TOF TAC
(PoS - Proceedings of Science, 2018)
Text en actes de congrés
Accés obertThe neutron capture cross section measurements at the CERN n_TOF facility are performed using a new detection system, the segmented Total Absorption Calorimeter (TAC). All measurements are performed in reference to the ... -
Depth sensitivity of frequency domain optical measurements in diffusive media
(OSA, 2017-06-01)
Article
Accés obertThe depth sensitivity functions for AC amplitude, phase (PH) and DC intensity signals have been obtained in the frequency domain (where the source amplitude is modulated at radio-frequencies) by making use of analytical ... -
Determination of pumping and dynamic vacuum properties of conductive quaternary alloy of TiZrVAg non-evaporable getter
(Joint Accelerator Conferences Website (JACoW), 2022)
Text en actes de congrés
Accés obertNon Evaporable Getter (NEG) coating has been employed extensively in the particle accelerator especial-ly where the vacuum conductance of the vessel is se-verely restricted and ultra-high vacuum condition is required. NEG ... -
Dynamic Range Extension of a SPAD Imager Using Non-Uniformity Correction Techniques
(IEEE, 2016-01-27)
Article
Accés obertThe extraordinary sensitivity of single-photon avalanche diodes (SPADs) makes these devices the ideal option for vision systems aimed at low-light applications. Nevertheless, there exist large dark count rate and photon ... -
High spatial entanglement via chirped quasi-phase-matched optical parametric down-conversion
(2012-11)
Article
Accés obertBy making use of the spatial shape of paired photons, parametric down-conversion allows the generation of two-photon entanglement in a multidimensional Hilbert space. How much entanglement can be generated in this way? In ... -
High-order harmonic generation driven by plasmonic fields: a new route towards the generation of UV and XUV photons?
(IOP, 2015-04-16)
Article
Accés obertWe present theoretical investigations of high-order harmonic generation (HHG) resulting from the interaction of noble gases with different kind of temporally and spatially synthesized laser fields. These fields, based on ... -
Implementation of a spatial two-dimensional quantum random walk with tunable decoherence
(2012-11)
Article
Accés obertWe put forward a versatile and highly scalable experimental setup for the realization of discrete two-dimensional quantum random walks with a single-qubit coin and tunable degree of decoherence. The proposed scheme makes ... -
In situ electrical and thermal monitoring of printed electronics by two-photon mapping
(Nature, 2017-06-19)
Article
Accés obertPrinted electronics is emerging as a new, large scale and cost effective technology that will be disruptive in fields such as energy harvesting, consumer electronics and medical sensors. The performance of printed electronic ... -
In situ photoelectron spectroscopy study of ethanol steam reforming over RhPd nanoparticles and RhPd/CeO2
(2016-05-25)
Article
Accés obertIn situ X-ray photoelectron spectroscopy (XPS) was carried out over model Rh0.5Pd0.5 nanoparticles and Rh0.5Pd0.5 nanoparticles supported on CeO2 following exposure to oxygen at 573-823 K, to hydrogen at 573 K (activation ... -
Information authentication using photon-counting double-random-phase encrypted images
(2011-01-01)
Article
Accés obert -
Insights into Q2Qbar2 states from an effective perspective
(American Physical Society, 2015-10-07)
Article
Accés obertWe discuss the two-photon coupling of the lightest scalar meson on the basis of an extension of χPT. Using low-energy data on the pion form factor and the γγ→π+π−(π0π0) cross sections as inputs, we find Γ(σ→γγ)≅0.126 keV. ... -
Photo-FETs: phototransistors enabled by 2D and 0D nanomaterials
(ACS, 2016-10-27)
Article
Accés obertThe large diversity of applications in our daily lives that rely on photodetection technology requires photodetectors with distinct properties. The choice of an adequate photodetecting system depends on its application, ... -
Photon control in nano-structured organic photovoltaic materials
(Universitat Politècnica de Catalunya, 2013-07-10)
Tesi
Accés obertOrganic photovoltaic (OPV) technology has emerged as a potential cost-effective solution to produce electrical energy. The foreseen low manufacturing costs combined with features as semi-transparency or mechanical flexibility ... -
Photon-counting double-random-phase encoding for secure image verification and retrieval
(Institute of Physics (IOP), 2012-09)
Article
Accés obert -
Photon-counting multifactor optical encryption and authentication
(Institute of Physics (IOP), 2015-02-01)
Article
Accés obertThe multifactor optical encryption authentication method [Opt. Lett., 31 721-3 (2006)] reinforces optical security by allowing the simultaneous authentication of up to four factors. In this work, the photon-counting imaging ... -
Properties of the spatial Wigner function of entangled photon pairs
(2009-10)
Article
Accés obertIn this paper we analyze some important characteristics of the spatial Wigner function of entangled photon pairs. We show that the Wigner description of quantum states that live in the infinite-dimensional spacemomentum degree ... -
Role of the spectral shape of quantum correlations in two-photon virtual-state spectroscopy
(2013-05)
Article
Accés obertThe true role of entanglement in two-photon virtual-state spectroscopy (Saleh et al 1998 Phys. Rev. Lett. 80 3483), a two-photon absorption spectroscopic technique that can retrieve information about the energy level ... -
Secure image encryption and authentication using the photon counting technique in the Gyrator domain
(Institute of Electrical and Electronics Engineers (IEEE), 2015)
Comunicació de congrés
Accés obert