Davor Ristić

Rudjer Boskovic Institute

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Maurizio Ferrari

National Research Council

Giancarlo C. Righini

Nello Carrara Institute of Applied Physics

Alessandro Chiasera

Istituto Nazionale di Fisica Nucleare, Trento Institute for Fundamental Physics And Applications

AŁ

Anna Łukowiak

Polish Academy of Sciences

Mile Ivanda

Rudjer Boskovic Institute

Stefano Varas

Istituto Nazionale di Fisica Nucleare, Trento Institute for Fundamental Physics And Applications

Andrea Chiappini

Istituto di Fotonica e Nanotecnologie

Roberta Ramponi

Center for Biomolecular Nanotechnologies

Francesco Scotognella

Polytechnic University of Turin

LŻ

Lidia Żur

Istituto di Fotonica e Nanotecnologie

Cooperative Institutions

Centre National de la Recherche Scientifique

Istituto di Fotonica e Nanotecnologie

National Research Council

University of Trento

Enrico Fermi Center for Study and Research

Istituto Nazionale di Fisica Nucleare, Trento Institute for Fundamental Physics And Applications

Fondazione Bruno Kessler

Nello Carrara Institute of Applied Physics

Fotonica (Brazil)

Center for Biomolecular Nanotechnologies

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Effects of Tm³⁺ Additions on the Crystallization of LaF₃ Nanocrystals in Oxyfluoride Glasses: Optical Characterization and Up‐Conversion

Journal of the American Ceramic Society (2012)

A. Martín Davor Ristić Somnath Bhattacharyya Thomas Höche Glenn C. Mather

The influence of the addition of 1 mol% Tm 2 O 3 on the nanocrystallization of LaF 3 in a glass of composition 55 SiO 2 –20 Al 2 O 3 –15 Na 2 O –10 LaF 3 (mol%) has been studied. Tm 2 O 3 affects the phase separation in the glass and delays the onset of crystallization with respect to the undoped glass. Additionally, the maximum LaF 3 crystal size is slightly greater than that in the undoped glass–ceramics. The microstructural and compositional changes in the glass matrix have been studied using several techniques, including viscosity, dilatometry, X‐ray and neutron diffraction ( XRD , ND ), quantitative Rietveld refinement, transmission electron microscopy ( TEM ), differential scanning calorimetry ( DSC ), and Raman spectroscopy. Photoluminescence measurements indicate that the Tm 3+ ions are distributed between the glassy matrix and LaF 3 crystals. Eu 2 O 3 has been used as structure probe and part of the Eu 3+ ions are reduced to Eu 2+ when incorporated in the LaF 3 nano‐crystals. Up‐conversion spectra under IR ‐excitation show a higher intensity of the blue emission in the Tm ‐doped glass–ceramic compared with that in the glass.

Glass-ceramic

10.1111/jace.12120

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Citations (52)

Glass based structures fabricated by rf-sputtering

Alessandro Chiasera Francesco Scotognella Dominik Dorosz G. Galzerano Anna Łukowiak

In this paper we present some results obtained by our consortium regarding rf-sputtered glass-based structures.

10.23919/mipro.2017.7973384

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Automatic measurement of alpha-particle track density by the spark count method

International Journal of Radiation Applications and Instrumentation Part D Nuclear Tracks and Radiation Measurements (1990)

R. Benderać R. Antanasijević Davor Ristić

Alpha particle

Alpha (finance)

SPARK (programming language)

Particle (ecology)

10.1016/1359-0189(90)90153-o

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RED glass-based microcavities enabling luminescence control

HAL (Le Centre pour la Communication Scientifique Directe) (2014)

Davor Ristić Anna Łukowiak Alessandro Chiasera Andrea Chiappini Mile Ivanda

Optical microcavities are structures that enable confinement of light to microscale volumes. Moreover, depending on their geometrical, compositional and structural parameters such sub-wavelenght photonic systems allow a fine tailoring of the luminescence, when activated by luminescent species. Here we focus our attention on 1-D photonic crystals and on spherical microresonators, both of them activated by Er3+ ions. The glass-derived 1-D photonic crystal is a microcavity constituted by an erbium-doped layer sandwiched between two Bragg mirrors respecting a lambda/2 periodicity, where lambda is the desired operating resonance wavelength. This microcavity is fabricated by rf-sputtering. The spherical microresonator consists in a silica sphere with a diameter of about 150 µm coated with a erbium-doped silica-hafnia layer of about 1 µm in thickness. The spherical substrate is obtained by melting a fiber and the coating is achieved by sol gel dip-coating technique. The 1-D microcavities exhibits a significant quality factor The effect of the cavity on the 4I13/2→4I15/2 emission band is demonstrated by the narrowing of the emission band as well as by the enhancement of the Er3+ photoluminescence intensity. The Er3+ 4I13/2→4I15/2 luminescence, excited by the whispering gallery modes typical of these cavities, exhibits interesting properties as a function of the geometrical properties of the resonator.

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Red photonic glasses and confined structures

Bulletin of the Polish Academy of Sciences Technical Sciences (2014)

Rogéria Rocha Gonçalves Anna Łukowiak Davor Ristić B. Boulard Andrea Chiappini

Abstract We present some recent results obtained by our team in rare earth doped photonic glasses and confined structures, in order to give some highlights regarding the state of art in glass photonics. To evidence the unique properties of transparent glass ceramics we compare spectroscopic and structural properties between the parent glass and the glass ceramics. Starting from planar waveguides we move to spherical microresonators, a very interesting class of photonic confined structures. We also conclude the short review with some remarks about the perspective for glass photonics.

Photonic metamaterial

10.2478/bpasts-2014-0071

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Producing high quality chalcogenide spherical microresonators and investigating their nonlinear properties

Davor Ristić Mile Ivanda Elena Romanova V.S. Shiryaev Silvia Soria

Microresonators are very suitable for sensing application and investigation of nonlinear effects, due to their enormous quality factor and small mode volume. These properties can be extended to the mid-infrared spectral range by creating microresonators from chalcogenide glasses, which are transparent in the mid-infrared and have large third-order optical nonlinearity. We present the analysis of the nonlinear effects observation in chalcogenide microspheres created by inert gas heating.

Chalcogenide glass

Q factor

10.1117/12.2306795

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RF-Sputtering Technique for Fabrication of Dielectric Multilayer Structures with Low-Threshold Coherent Emission at 1.5 μm

Alessandro Chiasera Mile Ivanda Stefano Taccheo L.T. Tran Daniele Zonta

Glasses based systems activated by rare earth ions are the starting point of numerous photonic devices and the control and the enhance of the emission properties of emitters is a crucial challenge for these kinds of active systems. The tailoring of the dielectric surrounding of the source is a viable possibility and several geometry, materials and fabrications protocols have been proposed at this aim. Among the different possible approaches, one-dimensional (1D) photonic crystals, that are the simplest photonic band-gap device exploitable to manipulate the emission and absorption properties of rare earth ions, are well known to provide good results in the nanometric confinement of the light. However, on these kinds of structures, the dependence of the final product on the fabrication protocol remains a crucial task of the research in material science. Various techniques that could be employed to fabricate oxide dielectric materials and rf-sputtering is a promising route to fabricate rare earth-activated 1D photonic crystals. Here we discuss some recent results regarding the design, fabrication and characterization of Er ³⁺ doped SiO ₂ /TiO ₂ 1D photonic microcavity (fig. 1). Different geometrical configurations are compared in order to put in evidence the effect of the geometry of the photonic crystals on the emission features. Coherent emission is assessed with threshold at about 4pW observed on the optimized sample (fig. 2) and a first step towards the integration on the tip of the fiber is presented. We show as the rf-sputtering technique is suitable for the fabrication of high-quality structures matrix for coherent emission based on active glass. We present the steps used in the fabrication protocols and the optical, spectroscopic, structural and morphologic results of the samples.

10.1109/cleoe-eqec.2019.8871816

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Citations (1)

Résonateurs optiques à très fort Q et applications Projets ANR-ORA et CNES-SHYRO

HAL (Le Centre pour la Communication Scientifique Directe) (2013)

Khaldoun Saleh Aurélien Coillet Vincent Huet Amel Ali Slimane Rémy Henriet

Les projets ANR ORA (Optical Resonators and Applications) et CNES SHYRO (Sources HYperfrequences a base de mini Resonateurs Optiques) visent a modeliser, realiser et caracteriser des resonateurs optiques presentant des coefficients de qualite extremes avec un volume de mode faible, et a mettre en valeur ces composants dans des applications, en particulier en realisant des oscillateurs hyperfrequences a tres faible bruit de phase.

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On the general-order kinetics of the thermoluminescence glow peak and the calculation of parameters from glow curves

Journal of Luminescence (1998)

Z. Vejnović Miroslav Pavlović Davor Ristić M. Davidović

Frequency factor

10.1016/s0022-2313(98)00006-4

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Citations (11)

Low-Threshold Coherent Emission at 1.5 µm from Fully Er3+ Doped Monolithic 1D Dielectric Microcavity Fabricated Using Radio Frequency Sputtering

Ceramics (2019)

Cesare Meroni Francesco Scotognella Yann G. Boucher Anna Łukowiak Davor Ristić

Low threshold coherent emission at 1.5 µm is achieved using Er3+-doped dielectric 1D microcavities fabricated with a Radio Frequency-sputtering technique. The microcavities are composed of a half-wavelength Er3+-doped SiO2 active layer inserted between two Bragg reflectors consisting of ten, five, and seven pairs of SiO2/TiO2 layers, also doped with Er3+ ions. The morphology of the structure is inspected using scanning electron microscopy. Transmission measurements show the third and first order cavity resonance at 530 nm and 1.5 µm, respectively. The photoluminescence measurements are obtained using the optical excitation at the third order cavity resonance using a 514.5 nm Ar+ laser or Xe excitation lamp at 514.5 nm, with an excitation angle of 30°. The full width at half maximum of the emission peak at 1535 nm decreased with the pump power until the spectral resolution of the detection system was 2.7 nm. Moreover, the emission intensity presents a non-linear behavior with the pump power and a threshold at about 4 µW.

Spectral width

10.3390/ceramics2010007

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Citations (4)