S. Pelli

Nello Carrara Institute of Applied Physics

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Document Type

Co-Authors

Giancarlo C. Righini

Nello Carrara Institute of Applied Physics

289

Gualtiero Nunzi Conti

Nello Carrara Institute of Applied Physics

196

Maurizio Ferrari

National Research Council

136

Alessandro Chiasera

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

110

Simone Berneschi

Nello Carrara Institute of Applied Physics

106

Andrea Chiappini

Istituto di Fotonica e Nanotecnologie

M. Brenci

Nello Carrara Institute of Applied Physics

Silvia Soria

Nello Carrara Institute of Applied Physics

M. Montagna

University of Trento

Y. Jestin

Institut National de la Recherche Scientifique

Cooperative Institutions

National Research Council

Centre National de la Recherche Scientifique

University of Trento

Nello Carrara Institute of Applied Physics

Istituto di Fotonica e Nanotecnologie

Istituto Nazionale per la Fisica della Materia

University of Padua

Enrico Fermi Center for Study and Research

National Academies of Sciences, Engineering, and Medicine

Fondazione Bruno Kessler

Author Statistics

Papers

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Preparation and characterization of ZnO particles embedded in organic-inorganic planar waveguide by sol-gel route

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2008)

Andrea Chiappini C. Armellini Alessandro Chiasera Maurizio Ferrari Romain Guider

Hybrid organic-inorganic waveguides based on ZnO-(3-glycidoxypropil)trimethoxisilane (GPTS) have been fabricated by sol-gel route. A transparent sol of ZnO was added to the GPTS host and the resulting sol was deposited on silica substrates by spin coating technique. Waveguides with different molar composition (100-x)GPTS-xZnO (x=10, 20, 30) were investigated by different diagnostic techniques. Morphological measurements were carried out by means of an AFM apparatus, and a roughness of few nanometers was determinate for all the waveguides. Optical properties such as refractive index, thickness, number of propagating modes and attenuation coefficient were measured at 632.8, 543.5, 1319 and 1542 nm by the prism coupling technique as a function of the ZnO content. Photoluminescence measurements showed a large luminescence band in the region between 350 nm to 600 nm with a main peak centred at about 380 nm, due to the presence of ZnO nanoparticles.

Waveguide

Nanometre

Characterization

Spin Coating

10.1117/12.781197

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Citations (1)

Coherent white light confocal fluorescence imaging and fluorescence lifetime imaging microscopy

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2009)

Silvia Soria Franco Quercioli Raffaella Mercatelli Federica Bianco Ilaria Cacciari

We report on the application of a simple white light source based on the supercontinuum generation from commercial photonic crystal fibres to confocal fluorescence microscopy and fluorescence lifetime imaging (FLIM) microscopy. The coherent white light can be tuned by varying the wavelength and intensity of the pump, a Ti:Sapphire laser. There are several advantages jn the use of SC sources: spatially coherent white radiation, tuning ranges of approximately 400 nm, high brightness, a robust compact system (potentially all-fibre) and relatively low cost. Being pulsed, SC sources are suitable for FLIM and may be used for multiple excitation.

Supercontinuum

Fluorescence-lifetime imaging microscopy

10.1117/12.821199

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Citations (0)

Optical and spectroscopic characterization of Er/Yb-activated planar waveguides

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2000)

S. Pelli M. Brenci Matteo Fossi Giancarlo C. Righini C. Duverger

Soda-lime silicate glasses doped with different percentages of Er- and Yb-oxides were produced by melting, and both planar and channel waveguides were fabricated by diluted silver ion exchange. Their optical and spectroscopic properties have been investigated, and some results are reported here. The optical parameters such as refractive index, diffusion depth and number of modes were measured by m-line technique. Absorption and fluorescence spectra were also measured; particular attention was focused on upconversion phenomena. The upconversion luminescence spectra of an Er/Yb-activated waveguide were obtained by continuous-wave excitation at 514.5 nm, as a function of the excitation power. The weak upconversion bands are assigned to the ²H_9/2 yields ⁴I_15/2 and ⁴G_11/2 yields ⁴I_15/2 transitions of the Er³⁺ ion. The upconversion mechanism is found to be a two-photon process. Preliminary results of gain measurements in channel waveguides showed signal enhancement at 1.5 micrometers , for high input signal intensities, upon pumping at 0.98 micrometers .

Photon Upconversion

Erbium

Ytterbium

Waveguide

10.1117/12.382851

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Citations (3)

Highly accurate index measurement of layers by means of grating excitation of guided modes

Manuel Flury Nathalie Destouches Frédéric Celle S. Tonchev Jean-Claude Pommier

Source

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Towards a Glass New World: The Role of Ion-Exchange in Modern Technology

Applied Sciences (2021)

Simone Berneschi Giancarlo C. Righini S. Pelli

Glasses, in their different forms and compositions, have special properties that are not found in other materials. The combination of transparency and hardness at room temperature, combined with a suitable mechanical strength and excellent chemical durability, makes this material indispensable for many applications in different technological fields (as, for instance, the optical fibres which constitute the physical carrier for high-speed communication networks as well as the transducer for a wide range of high-performance sensors). For its part, ion-exchange from molten salts is a well-established, low-cost technology capable of modifying the chemical-physical properties of glass. The synergy between ion-exchange and glass has always been a happy marriage, from its ancient historical background for the realisation of wonderful artefacts, to the discovery of novel and fascinating solutions for modern technology (e.g., integrated optics). Getting inspiration from some hot topics related to the application context of this technique, the goal of this critical review is to show how ion-exchange in glass, far from being an obsolete process, can still have an important impact in everyday life, both at a merely commercial level as well as at that of frontier research.

Realisation

10.3390/app11104610

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Citations (36)

Er3+-doped silica-based microcavities and microspheres

HAL (Le Centre pour la Communication Scientifique Directe) (2008)

Maurizio Ferrari C. Armellini Simone Berneschi S.N.B. Bhaktha Andrea Chiappini

Two different silica-based glass systems with valuable optical and spectroscopic properties in the mu1.5 band, exploited in optical microcavities, are presented. First, we report on Er3+-activated core-shell silica spheres prepared by sol-gel process. The core consists of a silica sphere of 270 nm in diameter, while the shell is an Er2O3-SiO2 film. The second system is an Er3+-activated microcavity fabricated by rf-sputtering technique. The cavity is constituted of an Er3+-doped SiO2 layer inserted between two Bragg mirrors, fabricated by alternately stacking five TiO2 and five SiO2 thin films. Optical and spectroscopic properties were assessed, and the two systems were characterized from morphological and structural point of view.

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Er3+-activated nanocomposite photonic glasses and confined structures

Optical Materials (2008)

Cristina Armellini Andrea Chiappini Alessandro Chiasera Maurizio Ferrari Y. Jestin

10.1016/j.optmat.2007.12.017

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Citations (1)

Er3+/Yb3+-activated silica–titania planar waveguides for EDPWAs fabricated by rf-sputtering

Journal of Non-Crystalline Solids (2003)

Alessandro Chiasera C. Tosello E. Moser M. Montagna Romina Belli

Photoluminescence excitation

10.1016/s0022-3093(03)00217-5

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Citations (30)

SiO2-SnO2 transparent glass-ceramics activated by rare earth ions

Lidia Żur L.T. Tran Damiano Massella Alessandro Vaccari Andrea Chiappini

Looking at the literature of the last years is evident that glass-based rare-earth-activated optical structures represent the technological pillar of a huge of photonic applications covering Health and Biology, Structural Engineering, Environment Monitoring Systems and Quantum Technologies. Among different glass-based systems, a strategic place is assigned to transparent glass-ceramics, nanocomposite materials, which offer specific characteristics of capital importance in photonics. These two-phase materials are constituted by nanocrystals or nanoparticles dispersed in a glassy matrix. The respective composition and volume fractions of crystalline and amorphous phase determine the properties of the glass-ceramics. The key to make the spectroscopic properties of the glass-ceramics very attractive for photonic applications is to activate the nanocrystals by luminescent species as rare earth ions. From a spectroscopic point of view the more appealing feature of glass-ceramic systems is that the presence of the crystalline environment for the rare earth ions allows high absorption and emission cross sections, reduction of the non-radiative relaxation thanks to the lower phonon cut-off energy and tailoring of the ion-ion interaction by the control of the rare earth ion partition. Although the systems have been investigated since several years, chemical and physical effects, mainly related to the synthesis and to the ions interactions, which are detrimental for the efficiency of active devices, are subject of several scientific and technological investigations. Here we focus on fabrication and assessment of glass-ceramic photonic systems based on rare earth activated SiO₂-SnO₂ glasses produced by sol-gel route.

10.1117/12.2507214

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Citations (8)

<title>Ion exchange in glass: a mature technology for photonic devices</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2001)

Giancarlo C. Righini S. Pelli

Ion exchange processes in glass have been studied since several decades, and have demonstrated themselves as one of the most convenient technologies to produce integrated optical components and devices. Ion-exchanged waveguides are attractive candidates for photonic components because they exhibit low insertion losses, thanks also to the capability of very good matching to the modal field of an optical fiber, and their fabrication costs are very low in batch production. A brief overview of the main processes and demonstrated applications is presented here.

Integrated Optics

10.1117/12.447638

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Citations (19)