Exploració per autor "Vilaseca Alavedra, Ramon"
Ara es mostren els items 21-38 de 38
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Flat focusing mirrors
Staliunas, Kestutis; Cheng, Yu-Chiech; Kicas, Simonas; Trull Silvestre, José Francisco; Cojocaru, Crina; Peckus, Martynas; Vilaseca Alavedra, Ramon; Drazdys, Ramutis (Institute of Electrical and Electronics Engineers (IEEE), 2015)
Text en actes de congrés
Accés restringit per política de l'editorialWe present the flat focusing mirror - the dielectric mirrors capable to focus and image the narrow beams in reflections. The mirrors are flat, and transversally invariant, i.e. have no optical axis. We consider two different ... -
Gain/loss periodic spatial modulated materials on a wavelength scale
Staliunas, Kestutis; Herrero Simon, Ramon; Vilaseca Alavedra, Ramon (IEEE Press. Institute of Electrical and Electronics Engineers, 2009-06-28)
Text en actes de congrés
Accés obert -
Harmonic generation from metal-oxide and metal-metal boundaries
Escalora, M.; Vincenti, M. A.; de Ceglia, Domenico; Akozbek, Neset; Bloemer, M. J.; De Angelis, C.; Haus, J.W.; Vilaseca Alavedra, Ramon; Trull Silvestre, José Francisco; Cojocaru, Crina (American Physical Society (APS), 2018-08-20)
Article
Accés obertWe explore the outcomes of detailed microscopic models by calculating second- and third-harmonic generation from thin-film surfaces with discontinuous free-electron densities. These circumstances can occur in structures ... -
Harmonic generation in the opaque region of GaAs: the role of the surface and magnetic nonlinearities
Rodríguez Suñé, Laura; Trull Silvestre, José Francisco; Escalora, M.; Vilaseca Alavedra, Ramon; Cojocaru, Crina (2019-08-29)
Article
Accés obertPhase-locked second and third harmonic generation in the opaque region of a GaAs wafer is experimentally observed and analyzed both in transmission and reflection. These harmonic components, which are generated close to ... -
Large nonlinear efficiency enhancement in the visible and UV range from plasmonic gold nanogratings
Cojocaru, Crina; Mukhopadhyay, Shroddha; Rodríguez Suñé, Laura; Vicenti, Maria Antonietta; Vilaseca Alavedra, Ramon; Scalora, Michael; Trull Silvestre, José Francisco (Institute of Electrical and Electronics Engineers (IEEE), 2023)
Text en actes de congrés
Accés restringit per política de l'editorialWe report a combined experimental/theoretical investigation on second and third harmonic generation from a plasmonic gold nanograting, that exhibits a plasmonic resonance in the near IR. The intense field localization leads ... -
Observation of azimuthal modulation instability and formation of patterns of optical solitons in a quadratic nonlinear crystal
Petrov, Dimitri; Torner Sabata, Lluís; Martorell Pena, Jordi; Vilaseca Alavedra, Ramon; Pérez Torres, Juan; Cojocaru, Crina (1998-09)
Article
Accés restringit per política de l'editorialWe report what is believed to be the first experimental demonstration of the azimuthal self-breaking of intense beams containing a vortex phase dislocation into sets of optical spatial solitons in a quadratic nonlinear ... -
Phase locked second harmonic etalon localization
Roppo, Vito; D'Aguanno, G.; Cojocaru, Crina; Raineri, F.; Trull Silvestre, José Francisco; Vilaseca Alavedra, Ramon; Raj, R; Scalora, M. (2009)
Text en actes de congrés
Accés restringit per política de l'editorialDuring the last decades a phase locking phenomenon has been observed for second harmonic (SH) generation but only recently it was recognized as such in systematic studies. The general solution of the SHG from a linear/nonlinear ... -
Pràctiques de l'assignatura
Botey Cumella, Muriel; Martorell Pena, Jordi; Belana Punseti, Juan; Carloa Cañadas, Joan; Diego Vives, José Antonio; Font García, Josep Lluís; Martin, Josep; Mudarra López, Miguel; Vilaseca Alavedra, Ramon; Calaf Zayas, Jaume; García Ojalvo, Jordi (Universitat Politècnica de Catalunya, 2000)
Pràctica
Accés obert -
Quantum mechanics
Vilaseca Alavedra, Ramon; Acín dal Maschio, Antonio (2009-10-21)
Audiovisual
Accés obert -
Rogue waves in injected semiconductor lasers with current modulation: role of the modulation phase
Ahuja, Jatin; Nalawade, Dhananjay Bhiku; Zamora Munt, Jordi; Vilaseca Alavedra, Ramon; Masoller Alonso, Cristina (2014-11-17)
Article
Accés restringit per política de l'editorialSemiconductor lasers with continuous-wave optical injection display a rich variety of behaviors, including stable locking, periodic or chaotic oscillations, excitable pulses, etc. Within the chaotic regime it has been shown ... -
Second and third harmonic generation in disordered quadratic nonlinear media: application to short-pulse characterization
Roppo, Vito; Wang, W.; Kalinowski, K.; Vilaseca Alavedra, Ramon; Trull Silvestre, José Francisco; Cojocaru, Crina; Staliunas, Kestutis; Krolikowski, Wieslaw; Kivshar, Yu. (2010)
Text en actes de congrés
Accés restringit per política de l'editorialWe study parametric frequency conversion in quadratic nonlinear media with disordered ferroelectric domains. We demonstrate that disorder allows realizing broadband second- and third-harmonic generation via cascading of ... -
Second-harmonic generation in disordered quadratic media: role of a ferroelectric domain structure
Roppo, Vito; Kalinowski, K.; Wang, W.; Cojocaru, Crina; Trull Silvestre, José Francisco; Vilaseca Alavedra, Ramon; Scalora, M.; Krolikowski, Wieslaw; Kivshar, Yu. (2010)
Text en actes de congrés
Accés obertWe study theoretically the second harmonic generation in a nonlinear quadratic crystal with random distribution of ferroelectric domains. We show that the specific features of disordered domain structure greatly affect the ... -
Second-harmonic generation in disordered quadratic media: role of a ferroelectric domain structure
Roppo, Vito; Kalinowski, K.; Wang, W.; Cojocaru, Crina; Trull Silvestre, José Francisco; Vilaseca Alavedra, Ramon; Scalora, M.; Krolikowski, Wieslaw; Kivshar, Yu. (2010)
Text en actes de congrés
Accés restringit per política de l'editorialNaturally grown ferroelectric crystals such as Strontium Barium Niobate (SBN) often exhibit an irregular multidomain structure with rod-like domains [1]. These disordered nonlinear quadratic crystals have attracted a ... -
Subdiffraction and spatial filtering due to periodic spatial modulation of the gain/loss profile
Staliunas, Kestutis; Herrero Simon, Ramon; Vilaseca Alavedra, Ramon (2018-11)
Report de recerca
Accés obertWe investigate light propagation through materials with periodically modulated gain/loss profile in both transverse and longitudinal directions, i.e. in material with two-dimensional modulation in space. We predict effects ... -
The effect of domain distribution on second harmonic generation in disordered nonlinear media
Roppo, Vito; Saltiel, Salomon M.; Wang, W.; Kalinowski, K.; Trull Silvestre, José Francisco; Cojocaru, Crina; Neshev, Dragomir N.; Krolikowski, Wieslaw; Vilaseca Alavedra, Ramon; Staliunas, Kestutis; Kivshar, Yu. (2009)
Text en actes de congrés
Accés restringit per política de l'editorialWe study theoretically and experimentally the second harmonic generation in nonlinear crystals with random distribution of ferroelectric domains. We show that the specific features of disordered domain structure greatly ... -
The role of the phase locking phenomenon in the second and third harmonics cavity localization
Roppo, Vito; Cojocaru, Crina; D'Agunaro, G.; Ranieri, F.; Raj, R.; Trull Silvestre, José Francisco; Vilaseca Alavedra, Ramon; Scalora, M. (2009)
Text en actes de congrés
Accés restringit per política de l'editorialWe theoretically and experimentally study how the phase-locking mechanism changes effective dispersion of the medium at the harmonic frequencies making them become localized inside a opaque cavity designed to be resonant ... -
Ultrashort pulse chirp determination via transverse auto-correlation in SBN crystal
Wang, Bingxia; Cojocaru, Crina; Inigo Sola, Inigo Sola; Wieslaw Krolikowski, Wieslaw Krolikowski; Yan Sheng, Yan Sheng; Vilaseca Alavedra, Ramon; Trull Silvestre, José Francisco (2015)
Comunicació de congrés
Accés restringit per política de l'editorialWe determine the different initial chirp parameters of ultra-short pulses down to 30 fs via single-shot transverse auto-correlation method based on transverse second harmonic generation in SBN crystal with random distribution ... -
Ultrashort pulse chirp measurement via transverse second-harmonic generation in strontium barium niobate crystal
Trull Silvestre, José Francisco; Sola, Ïñigo; Wang, Bingxia; Parra, Albert; Krolikowski, W.; Sheng, Y.; Vilaseca Alavedra, Ramon; Cojocaru, Crina (2015-06-01)
Article
Accés obertPulse compression in dispersive strontium barium niobate crystal with a random size and distribution of the anti-parallel orientated nonlinear domains is observed via transverse second harmonic generation. The dependence ...