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Dive into the research topics where A. Benayas is active.

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Featured researches published by A. Benayas.


ACS Nano | 2013

Subtissue Thermal Sensing Based on Neodymium-Doped LaF3 Nanoparticles

Uéslen Rocha; Carlos Jacinto da Silva; Wagner Ferreira Silva; Ilde Guedes; A. Benayas; Laura Martínez Maestro; Mónica Acosta Elias; Enrico Bovero; Frank C. J. M. van Veggel; José Antonio García Solé; Daniel Jaque

In this work, we report the multifunctional character of neodymium-doped LaF₃ core/shell nanoparticles. Because of the spectral overlap of the neodymium emission bands with the transparency windows of human tissues, these nanoparticles emerge as relevant subtissue optical probes. For neodymium contents optimizing the luminescence brightness of Nd³⁺:LaF₃ nanoparticles, subtissue penetration depths of several millimeters have been demonstrated. At the same time, it has been found that the infrared emission bands of Nd³⁺:LaF₃ nanoparticles show a remarkable thermal sensitivity, so that they can be advantageously used as luminescent nanothermometers for subtissue thermal sensing. This possibility has been demonstrated in this work: Nd³⁺:LaF₃ nanoparticles have been used to provide optical control over subtissue temperature in a single-beam plasmonic-mediated heating experiment. In this experiment, gold nanorods are used as nanoheaters while thermal reading is performed by the Nd³⁺:LaF₃ nanoparticles. The possibility of a real single-beam-controlled subtissue hyperthermia process is, therefore, pointed out.


Applied Physics Letters | 2010

Continuous wave laser generation at 1064 nm in femtosecond laser inscribed Nd:YVO4 channel waveguides

Yang Tan; Feng Chen; J. R. Vázquez de Aldana; G. A. Torchia; A. Benayas; Daniel Jaque

We report on continuous wave 1064 nm laser generation from an ultrafast laser inscribed neodymium-doped yttrium orthovanadate channel waveguide with pumping at 808 nm. Single-mode stable laser operations have been observed with pump powers at threshold as low as 14 mW and with laser slope efficiencies as high as 38.7%.


Optics Letters | 2010

Femtosecond-laser-written, stress-induced Nd:YVO 4 waveguides preserving fluorescence and Raman gain

W. F. Silva; C. Jacinto; A. Benayas; J. R. Vázquez de Aldana; G. A. Torchia; Feng Chen; Yang Tan; D. Jaque

We report the formation of optical waveguides in the self-Raman Nd:YVO(4) laser crystal by femtosecond laser inscription. The confocal fluorescence and Raman images have revealed that the waveguide is constituted by a locally compressed area in which the original fluorescence and Raman gains of the Nd:YVO(4) system are preserved. Thus the obtained structures emerge as promising candidates for highly efficient self-Raman integrated laser sources.


Optics Letters | 2010

Thermally resistant waveguides fabricated in Nd:YAG ceramics by crossing femtosecond damage filaments

A. Benayas; W. F. Silva; C. Jacinto; Eugenio Cantelar; J. Lamela; F. Jaque; J. R. Vázquez de Aldana; G.A. Torchia; Luis Roso; Alexander A. Kaminskii; D. Jaque

We report on femtosecond laser writing of channel waveguides in Nd(3+) ion doped YAG ceramics by multiple inscriptions of damage filaments. Waveguiding between filaments was found to resist annealing temperatures as high as 1500 degrees C. Microluminescence imaging experiments have been carried out to elucidate the potential application of the obtained waveguides as integrated laser sources as well as to elucidate the waveguiding mechanisms.


Optics Letters | 2010

Swift heavy-ion irradiated active waveguides in Nd:YAG crystals: fabrication and laser generation

Yingying Ren; Ningning Dong; Feng Chen; A. Benayas; D. Jaque; Feng Qiu; Tadashi Narusawa

An Nd:YAG planar waveguide laser has been fabricated by ultra-low-fluence (2×10(12) cm(-2)) swift heavy-ion irradiation (60 MeV Ar(4+) ions). The appearance of the buried waveguiding has been associated with an increased refractive index layer as a consequence of the ion-induced electronic damage. Continuous-wave laser oscillations at 1064.2 nm have been observed from the waveguide under 808 nm optical excitation, with the absorbed pump power at threshold and laser slope efficiency close to 26 mW and 5.9%, respectively.


Optics Letters | 2011

Direct laser writing of near-IR step-index buried channel waveguides in rare earth doped YAG

Airan Rodenas; A. Benayas; John R. Macdonald; Jun Zhang; D. Y. Tang; Daniel Jaque; Ajoy K. Kar

A new (to our knowledge) ultrashort laser pulse irradiation regime that allows us to directly modify and increase the refractive index of rare earth doped YAG polycrystalline ceramics has been identified. Single-mode buried channel waveguides in both Ho:YAG and Er:YAG ceramics at the near-IR wavelengths of 1.55 μm and 1.95 μm are demonstrated by fabricating positive square step-index cores. Minimum propagation losses of 1.5 dB cm(-1) at a 1.51 μm wavelength have been preliminarily obtained. Confocal microluminescence mapping reveals that the increased refractive index regions retain the near-IR spectral properties of Er3+ ions in the YAG crystalline matrix.


Optics Letters | 2012

Ultrafast laser fabrication of low-loss waveguides in chalcogenide glass with 0.65 dB/cm loss

Ben McMillen; Botao Zhang; Kevin P. Chen; A. Benayas; Daniel Jaque

We present 0.65-dB/cm loss symmetric waveguides fabricated in Gallium Lanthanum Sulfide glasses using spatial and temporal shaped ultrafast laser pulses. Micro-Raman analysis was used to correlate optical loss versus laser-induced lattice damages.


Journal of Chemical Physics | 2008

Microstructuration induced differences in the thermo-optical and luminescence properties of Nd:YAG fine grain ceramics and crystals

C. Jacinto; A. Benayas; T. Catunda; José García-Solé; Alexander A. Kaminskii; D. Jaque

The temperature and compositional dependences of thermo-optical properties of neodymium doped yttrium aluminum garnet (YAG) crystals and fine grain ceramics have been systematically investigated by means of time-resolved thermal lens spectrometry. We have found that Nd:YAG ceramics show a reduced thermal diffusivity compared to Nd:YAG single crystals in the complete temperature range investigated (80-300 K). The analysis of the time-resolved luminescent properties of Nd(3+) has revealed that the reduction in the phonon mean free path taking place in Nd:YAG ceramics cannot be associated with an increment in the density of lattice defects, indicating that phonon scattering at grain boundaries is the origin of the observed reduction in the thermal diffusivity of Nd:YAG ceramics. Finally, our results showed the ability of the time-resolved thermal lens to determine and optimize the thermo-optical properties of Nd:YAG ceramic based lasers.


Optics Letters | 2011

Femtosecond laser writing of multifunctional optical waveguides in a Nd:YVO4 KTP hybrid system

Ningning Dong; Yang Tan; A. Benayas; J. R. Vázquez de Aldana; Daniel Jaque; Carolina Romero; Feng Chen; Qingming Lu

We report on the fabrication of optical channel waveguides supporting both visible and IR TE and TM confinement in a hybrid system composed of a Nd:YVO4 laser gain medium glued to a potassium titanyl phosphate (KTP) nonlinear crystal. The microphotoluminescence and second harmonic confocal images of the fabricated waveguides have revealed that the laser and nonlinear properties of the constituent crystals have not been deteriorated because of the waveguide inscription. The resulting structures emerge as promising candidates for the development of multifrequency waveguide lasers.


Optics Letters | 2010

Microstructuring of Nd:YAG crystals by proton-beam writing

A. Benayas; Daniel Jaque; Yicun Yao; Feng Chen; Andrew A. Bettiol; Airan Rodenas; Ajoy K. Kar

We report on the microstructuring of Nd:YAG crystals by direct proton-beam writing. Buried channel waveguides have been fabricated with full spatial control by the combined variation of crystal position and proton energy. The fluorescence images of the obtained structures have been used to evaluate the potential application of the fabricated structures for laser gain as well as to elucidate the mechanism at the basis of the refractive index increment induced at the end of the proton path. We have concluded that this increment is very likely a local enhancement in the electronic polarizability caused by nuclear collisions.

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Daniel Jaque

Autonomous University of Madrid

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D. Jaque

Autonomous University of Madrid

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C. Jacinto

Federal University of Alagoas

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Kevin P. Chen

University of Pittsburgh

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