Past Events

Seminar Announcement: Simone Normani

posted Dec 20, 2018, 7:56 AM by Stefano Varas   [ updated Dec 20, 2018, 7:57 AM ]

Announcement
Thursday, 20 December 2018, 15:00
Sala Grande Palazzina B via alla Cascata 56/C

"Er3+-doped Ga-Ge-Sb-S glass PVD: A comparative study of sputtered and PLD thin films"

Simone Normani
University of Pardubice, Department of Graphic Arts and Photophysics,
Pardubický, Czech Republic

Abstract
Despite the renewed interest in rare earth-doped chalcogenide glasses that lies mainly in mid-IR applications, only few comprehensive studies so far have presented the photoluminescence of amorphous chalcogenide films from visible to mid-IR. This study reports the fabrication of luminescent PVD quaternary chalcogenide thin films using RF-sputtering and PLD and their characterization via EDS, SEM, XPS, Raman spectroscopy, AFM and ellipsometry. Several Er3+ emission bands from visible to mid-infrared were clearly observed in the PVD films. The study of 4I13/2 level lifetimes enables development of suitable deposition parameters. The variation in surface roughness is limited, which ensures reasonable optical losses (0.7-0.9 dB/cm). Mid-IR photoluminescence from Er3+- doped micro-waveguide was demonstrated at ~2.76 µm. Finally, the effects of annealing on the chalcogenide films spectroscopy and lifetimes were assessed. The luminescence from the visible to mid-IR generated using erbium doped chalcogenide wave-guiding micro-structures might find easy-to-use applications concerning telecommunication technologies or on-chip optical sensors for which luminescent sources or amplifiers operating at different wavelengths are required.

Seminar Announcement: Mariola Ramirez

posted Dec 5, 2018, 12:23 AM by Stefano Varas   [ updated Dec 5, 2018, 12:23 AM ]

Announcement
Wednesday, 5 December 2018, 15:00
Sala Grande Palazzina B via alla Cascata 56/C

"Interaction between localized surface plasmons and nonlinear solid state gain media"

Mariola Ramirez
Departamento Física de Materiales,
Universidad Autónoma de Madrid

Abstract
Noble metal nanostructures offers a promising perspective for the development of new photonic devices due to their ability to manipulate light in the nano-scale. Their extraordinary capability to couple light with collective oscillations of their conduction-band electrons results in a strong confinement of the electromagnetic energy in the surroundings of the metallic nanostructures. This feature can be used to enhance the interactions between the far-field light and optical emitters placed in close proximity to the metallic nanostructures.
In this context, different arrangements of silver nanoparticles formed on the surfaces of optically active ferroelectric crystals have shown their capability to obtain two types of optical radiation sources with improved performances at the nanoscale: i) Plasmon-assisted Nd3+-based solid state lasers and ii) Plasmon- enhanced Second Harmonic Generation. The mechanisms responsible for the intensification of the radiation–matter interaction processes by localized surface plasmon resonances are analyzed in each case.

Seminar Announcement: Francesco Scotognella

posted Dec 4, 2018, 3:23 AM by Stefano Varas   [ updated Dec 4, 2018, 3:23 AM ]

Announcement
Monday, 3 December 2018, 11:00
Sala Grande Palazzina B via alla Cascata 56/C

"Doped semiconductor nanocrystals for photonic and energy applications"

Francesco Scotognella
Dipartimento di Fisica - Politecnico di Milano,
E-mail: francesco.scotognella@polimi.it

Abstract
Doped semiconductor nanocrystals, as indium tin oxide and copper chalcogenide nanocrystals, are materials with a doping level of about 1021 charges/cm3. Therefore, they exhibit an intense localised surface plasmon resonance in the near infrared. This plasmonic resonance, depending on the number of carriers in the material, can be tuned in several ways, via chemical routes, via electrochemical, electric and optical stimuli.
We show photonic structures that embed doped semiconductor nanocrystals. The photonic structures show a tunable structural colour via photodoping and electrodoping.
Moreover, we discuss the possibility to exploit these nanomaterials, with their strong absorption in the near infrared, for energy applications.

Seminar Announcement: Charlotte Hurel

posted Nov 5, 2018, 8:14 AM by Stefano Varas   [ updated Nov 5, 2018, 8:14 AM ]

Announcement
Monday, 5 November 2018, 11:30
Sala Grande Palazzina C via alla Cascata 56/C

"Capping of marine sediments with valuable industrial by-­products: evaluation of inorganic pollutants immobilization"

Charlotte Hurel
Université Côte d’Azur, Institut de physique de Nice,
Parc Valrose, 06108 Nice Cedex 2, France

Abstract
In-situ capping of polluted sediment is considered as an inexpensive and effective treatment technology to immobilize contaminants in a short time. In this remediation technique sediments are capped by placing a layer of sand, clean sediment or other materials over sediments in order to mitigate risk. During this talk, I will present a bench scale laboratory experiment performed in aquariums to evaluate the effects of low cost industrial by products (bauxaline, steel slag, and their composite) used as capping agents to limit Cd, Zn, As, and Cr mobility from an artificially contaminated marine sediment.

Seminar Announcement: Franck Mady

posted Nov 5, 2018, 8:13 AM by Stefano Varas   [ updated Nov 5, 2018, 8:13 AM ]

Announcement
Monday, 5 November 2018, 10:00
Sala Grande Palazzina C via alla Cascata 56/C

"Role of some rare-earth dopants (Yb, Er, Yb/Ce) in the mechanism of radiation-induced degradation of aluminosilicate-core optical fibers"

Franck Mady
Université Côte d’Azur, CNRS, INФNI, UMR7010,
Parc Valrose, 06108 Nice Cedex 2, France

Abstract
This talk proposes a systematic review of the defects created in silica, in aluminosilicate, and in Yb-, Er- and Yb,Ce-doped silicate or aluminosilicate glasses under ionizing irradiation. The mechanisms of radiation-induced attenuation (RIA) development and annealing, including that of the RIA mitigation by Ce, are also presented. The reduction of rare-earth ions is always observed under irradiation, by electron trapping, accompanied of course by the trapping of holes, preferably at Al-substituted thetrahedral sites. Annealing mechanisms involve the recombination of holes with reduced RE ions, with emission of the charge-transfer relaxation of Yb3+ ions (regardless of co-doping) or that of Er3+ ions. Ce4+ ions are not restored by recombination, but by electron release at moderate temperature (below 500 °C).

Grande finale del progetto “Esploratori della Fotonica”

posted Oct 12, 2018, 2:06 AM by Stefano Varas   [ updated Oct 12, 2018, 2:10 AM ]


Grande finale del progetto “Esploratori della Fotonica” con il concorso vinto dagli studenti dell’ Istituto “Alcide Degasperi” di Borgo Valsugana guidati dalla prof.ssa Monica Ropele con l’esperimento “Il mondo della luce e la luce nel mondo”

Giovedì 11 ottobre gli alunni dei licei Da Vinci e Galilei di Trento, Rosmini di Rovereto e Degasperi di Borgo Valsugana si sono sfidati a suon di esperimenti sulla Luce presso il MuSe.

Il concorso ha concluso un percorso durato un anno svolto nell’ambito del progetto ESFO, coordinato da Andrea Chiappini, ricercatore dell’Istituto di Fotonica e Nanotecnologie IFN-CNR e finanziato dalla Fondazione Caritro.

Il progetto ha visto protagonisti insegnanti e studenti e si è articolato in workshop di formazione per gli insegnanti all’utilizzo di nuove metodologie didattiche e in seminari tematici e visite programmate presso i laboratori di IFN-CNR e FBK, partner di progetto, con l’obiettivo di approfondire concetti teorici e confrontarsi con le tecnologie impiegate nel mondo della ricerca.

Oltre ad aver visto premiato il lavoro svolto con i propri insegnanti, il pomeriggio al MuSe è stato per i ragazzi occasione di scambio di esperienze e di confronto di idee e risultati, da presentare ad altri istituti scolastici, alle famiglie e ad un pubblico generico.

Il gruppo di studenti vincitore è stato premiato con il kit didattico We Lab, offerto dalla ditta DNA Phone, che rappresenta una soluzione innovativa per la misura di parametri chimici e biologici mediante l’uso di dispositivi ottici connessi a piattaforme smart e mobile e con un trofeo offerto dalla Società Italiana di Ottica e Fotonica (SIOF).

http://esfo.fbk.eu/
http://esfo.fbk.eu/attivita/fase-concorsuale/

D-Photon 2018

posted Oct 5, 2018, 1:47 AM by Stefano Varas

http://d-photon.fbk.eu/

1st International Conference on Dielectric Photonic Devices and Systems Beyond Visible
held in Bari - Italy
1-2 October, 2018

D-Photon 2018 is the first edition of an International Conference covering a wide range of research topics concerning the design and fabrication techniques of optical and photonics devices and systems made of dielectric materials. In particular, the spectral range beyond visible is considered for its promising application in many fields.

More detailed information can be found on the webpage:
http://d-photon.fbk.eu/

Notte dei Ricercatori 2018

posted Oct 5, 2018, 1:32 AM by Stefano Varas   [ updated Oct 5, 2018, 1:44 AM ]


28 settembre 2018 a partire dalle 17.00
MUSE - Museo delle Scienze
Trento - Corso del Lavoro e della Scienza, 3

In occasione della Notte dei Ricercatori, sarà presente anche CNR-IFN alla postazione n.27 al primo piano del Muse.

L'argomento trattato sarà "MANIPOLARE LA LUCE CON IL VETRO"
Come fabbricare e sfruttare sottili strati di vetro.
Scopri con i ricercatori di FBK-CNR come costruire e caratterizzare sottilissimi strati di vetro, utili per svariate applicazioni: dalle sorgenti di luce per le telecomunicazioni alla sensoristica per onde acustiche, fino ai filtri ottici.

Vieni a trovarci

La persona di riferimento è Alessandro Chiasera


POSTER: ResearchDay-POSTER-A1.pdf


https://photos.app.goo.gl/49qxUUfYGSbJQCzLA

Photo Gallery, LA NOTTE dei RICERCATORI 2018



https://event.unitn.it/nottedeiricercatori2018/nottedeiricercatori2018.html

Seminar Announcement: Michael Scalora

posted Sep 17, 2018, 5:12 AM by Stefano Varas   [ updated Sep 17, 2018, 5:13 AM ]

Announcement
Thursday, 13 September 2018, 11:30
Sala Grande Palazzina C via alla Cascata 56/C

"Optics at the NANOSCALE: An Attempt at a Comprehensive Analysis of Surface Harmonic Generation...and more"

Michael Scalora
Charles M. Bowden Research Facility, AMRDEC, US Army RDECOM,
RDMR-WDS-R, Bldg. 7804 Redstone Arsenal, AL 35898

Abstract
We present a study of linear and nonlinear optical effects that occur when light interacts with metallic surfaces and generic structures with nanometer-scale features. Our model suggests that the nonlinear optical analysis of metals, conductive oxides, nano-antennas, meta-surfaces, etc. should be performed by including nonlocal effects (viscosity and pressure of free electrons); linear and nonlinear contributions of bound (inner-core) electrons to the dielectric constant; linear and nonlinear quantum tunneling currents if gaps between nanoparticles is on the nanometer and sub-nanometer scale; and conditions generally reflective of discontinuous free electron densities. We use a modified hydrodynamic model to evaluate harmonic generation from a gold mirror, where epsilon- near-zero conditions may be found and exploited, and from semiconductors like GaAs and GaP.

Seminar Announcement: Angela Seddon

posted Sep 13, 2018, 12:44 AM by Stefano Varas   [ updated Sep 13, 2018, 12:44 AM ]

Announcement
Tuesday, 11 September 2018, 15:00
Sala Grande Palazzina B via alla Cascata 56/C

"Towards rare earth doped mid-infrared fibre lasers"

Angela Seddon
Chair of Inorganic Materials. Head of Mid-Infrared Glasses Group, GGIEMR, Faculty of Engineering.
University of Nottingham, UK

Abstract
The progress made towards mid-infrared (MIR) fibre lasers will be described. Despite ongoing work since the late 1990s, fibre lasing above 4 microns wavelength in the MIR region has not yet been demonstrated. Current modelling has not uncovered all of the reasons for this lack of success. Photoluminescence and long photoluminescent lifetimes have been observed for rare earth ions such as Dy(III), Pr(III), Tb(III) and Ce(III) doped into selenide chalcogenide-glasses. Long PL lifetimes in small-core fibre will be shown. The underlying problem of impurities in the glass host causing extrinsic absorption has been modelled to reveal the true rare earth ion absorption cross-sections. The possibility of these unwanted impurities causing non-radiative depopulation of rare earth ion excited states will be addressed. In addition, the possibility of interference in the excited state dynamics of rare earth ions of the WAT (weak absorption tail) will also be introduced.

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