News


Seminar Announcement: Jonathan Bradley

posted by Stefano Varas   [ updated ]

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

"Rare-Earth-Doped Light-Emitting Thin Films and Photonic Devices on Silicon"

Jonathan Bradley
Barber-Gennum Chair in Information Technology, Department of Engineering Physics,
McMaster University

Abstract
Since the 1990’s, compact and low cost rare earth integrated amplifiers and lasers have received much attention, particularly for high speed telecommunications applications. Nevertheless, despite many advances, the technology has yet to see widespread application. The primary reason is that fiber-based devices, although bulkier, are very well established, offer good performance and can meet the requirements of larger telecom systems. Recently, however, with the rise of silicon photonics and scaling of transceiver technology in data centers, the demand for compact optical amplifier and light emitter solutions is high. In this talk I will discuss our recent progress in silicon-based rare earth amplifiers and lasers. I will focus on the rare-earth host material aluminum oxide (Al2O3), which exhibits high thermal stability, broad emission spectra, and reduced rare-earth clustering and higher refractive index than other common rare earth host materials such as silica, thus enables smaller devices. We have demonstrated compact erbium-doped waveguide amplifiers and a number of on-chip near-infrared lasers, including distributed feedback, distributed Bragg reflector and microcavity devices. I will discuss the potential for integration of such devices in silicon photonic microsystems.

Seminar Announcement: Jonathan Bradley

posted by Stefano Varas   [ updated ]

Announcement
Tuesday, 12 June 2018, 15:00
Sala Grande Palazzina B via alla Cascata 56/C

"Microlasers on silicon chips based on high-Q rare-earth-doped aluminum oxide micro-trench resonators"

Jonathan Bradley
Barber-Gennum Chair in Information Technology, Department of Engineering Physics,
McMaster University

Abstract
We report on rare-earth-doped microcavity lasers monolithically integrated on silicon nanophotonic chips. The microlasers are based on a novel silicon-photonics- compatible and high-Q microresonator design, which includes a silicon dioxide trench filled with rare-earth-doped aluminum oxide and a co-integrated silicon nitride bus waveguide. In passive (undoped) microresonators we measure internal quality factors > 106 at a wavelength of 1.5 µm. In ytterbium, erbium, and thulium- doped microcavities with diameters ranging from 80 to 200 µm we show lasing at 1.0, 1.5 and 1.9 µm, respectively. We observe sub-milliwatt lasing thresholds, approximately 10 times lower than previously demonstrated in monolithic rare- earth-doped lasers on silicon. The entire fabrication process, which includes post- processing deposition of the gain medium, is silicon-compatible and allows for integration of such lasers within integrated silicon photonic microsystems. Applications of such rare earth microlasers in integrated microsystems for communications and sensing will be discussed.

Seminar Announcement: Tindaro Ioppolo

posted by Stefano Varas   [ updated ]

Announcement
Tuesday, 12 June 2018, 10:30
Sala Grande Palazzina B via alla Cascata 56/C

"All photonic microsensors based on whipering gallery mode resonators"

Tindaro Ioppolo
Bobby Lyle School of Engineering, Department of Mechanical Engineering,
Southern Methodist University Dallas, Texas, USA

Abstract
A Spherical and dome shaped resonators made of different polymers are used as a sensing element for mechanical applications. The sensing mechanism is based on the propagation of whispering gallery waves that are traveling into optical cavities. Tethered and untethered sensors will be presented. Tethered sensors are mainly spherical micro cavities that are coupled evanescently to a single mode optical fiber. The optical fiber serves as input output port to excite and interrogate the optical modes. Untethered sensors are essentially spherical or dome shaped microscale lasers that are excited using an external light source. The emission spectrum of the microscale laser is observed using a spectrometer. This last configuration allows for a remote excitation and interrogation of the optical modes. In both configurations, a change in the morphology of the micro cavity due to an external effect leads to a shift in its optical modes. The optical shift in turn is monitored and related to the external effect. Sensors based on this concept will be presented for different applications.

Seminar Announcement: Tindaro Ioppolo

posted by Stefano Varas   [ updated ]

Announcement
Wednesday, 13 June 2018, 10:30
Sala Grande Palazzina B via alla Cascata 56/C

"Magnetostrictive and electrostrictive optical cavities"

Tindaro Ioppolo
Bobby Lyle School of Engineering, Department of Mechanical Engineering,
Southern Methodist University Dallas, Texas, USA

Abstract
The effect of electric and magnetic field on the optical resonances of electrostrictive and magnetostrictive optical resonators is presented. The electrostrcitve or the magnetostrictive effect is the elastic deformation of a solid when subject to an electric or magnetic field. The optical resonator has a spherical shape and a diameter of a few hundred micrometers. The resonator is fabricated using a polymeric matrix made of Polyvinyl Chloride (PVC) Plastisol with embedded magnetically polarizable micro-particles. When the optical resonator is exposed to an external electric or magnetic field, the morphology (radius and refractive index) of the resonator is perturbed by the magnetic or electric forces acting on it, leading to a shift of the optical resonances also known as whispering gallery modes (WGM). In this study, the effect of a static and harmonic magnetic and electric field on the optical mode shift is investigated. The optical resonances obtained with the PVC plastisol resonator showed a quality factor of ~106. The optical shift in turn is monitored and related to the external effect. Sensors based on this concept will be presented for different applications.

Giorno Internazionale della Fotonica 26-27 maggio

posted May 15, 2018, 12:44 AM by Stefano Varas   [ updated May 17, 2018, 8:49 AM ]

CNR-IFN Trento celebrerà il giorno internazionale della luce partecipando all'evento "Siamo Europa" i giorni 26 e 27 maggio, dove verranno illustrati alla comunità i progetti di outreach “PHABLABS 4.0” e "Esploratori della Fotonica" che mirano a sensibilizzare, diffondere e creare curiosità nel mondo della Fotonica.

https://www.lightday.org/events
https://siamoeuropa.provincia.tn.it/
http://www.phablabs.eu/
http://esfo.fbk.eu/


9 maggio 2018 - Attività di Outreach “PhabLab4.0”

posted May 10, 2018, 2:42 AM by Stefano Varas   [ updated May 14, 2018, 12:42 AM ]

Si è svolta ieri, presso il MuSe, la prima edizione del “Photonic Challenge” nell’ambito del progetto Europeo PhabLab4.0 che vede coinvolto l’Istituto di Fotonica e Nanotecnologie sez. Trento.

https://sites.google.com/site/ifntrento/news/9maggio2018-attivitadioutreachesploratoridellafotonica/lAdige%2010-05-2018.jpg?attredirects=0

Roberta Ramponi President of the ICO

posted Feb 28, 2018, 3:43 AM by Stefano Varas   [ updated Feb 28, 2018, 3:44 AM ]

We are pleased to congratulate with our Director Roberta Ramponi, who has been elected President of the International Commission for Optics (ICO).



http://www.primapagina.sif.it/article/738

Ramponi ICO.pdf

XXIIIrd IKSS 2018

posted Feb 15, 2018, 2:31 AM by Stefano Varas   [ updated Feb 15, 2018, 2:32 AM ]

XXIIIrd International Krutyń Summer School
Krutyń, Masurian Lake District, Poland,
May 20-26, 2018

GENERAL INFORMATION & GOAL
The XXIIIrd International Krutyn Summer School - “Advanced Lanthanide Molecules and Materials for Bioimaging and Medical Diagnostics: State of the Art” - is organized by the Institute of Physical Chemistry of the Polish Academy of Sciences, Poland, and the University of Geneva, Switzerland. This Summer School aims at the state-of-the-art training in the form of lectures and discussion sessions designed for Ph.D. students and young researchers seeking to reinforce their knowledge and skills in the field of advanced medical diagnostics. Top experts in this area will deliver lectures and discussion sessions. The school is intended both for people already active in this R&D field, as well as for those new to the field. A number of social events will be also proposed to relax after the heavily-scheduled program, including discotheque, bonfire, boats on Krutynia River, guided, or individual out-door activities (kayaking, trekking, bicycling, Nordic walking, high-class ballooning, etc.). The Local Organizing Committee cordially invites you to take part in this Summer School.

Find out more here: http://bioimaging.ikss.eu/ or contact directly the organizers:


http://bioimaging.ikss.eu/

CIMTEC 2018

posted Oct 3, 2017, 5:52 AM by Stefano Varas   [ updated Oct 3, 2017, 5:52 AM ]

http://2018.cimtec-congress.org/symposium_cl

Symposium CL
Inorganic Materials Systems for Advanced Photonics

The fruitful exploitation of optical ceramics and glasses and related photonic structures and devices as crucial pivots for the development of several enabling technologies provides a large spectrum of functionalities that allow us to face successfully socio- economic challenges in many fields going from energy production and saving to efficient and clean industrial cycles, from environmental protection to fast efficient novel communication systems, from structural monitoring to quantum technologies and to healthcare applications.
This Symposium, that follows the several ones on similar subject held at previous CIMTEC conferences, is to provide latest insights on fabrication, characterization and exploitation of photonic structures based on ceramics (oxides, oxynitrides, fluorides, sulphides, chalcogenides, etc...) inorganic non-metallic glasses, glass- ceramics, and ceramic/metal and glass/metal combinations in the form of nanostructured, bulk and graded materials and coatings, fibres, thin films, superlattices and other small confined systems, nanomaterials, nanocomposites and functional nanoparticles.
Focus will be on theory, modelling and simulation of materials and processes, green and advanced fabrication protocols (self assembly, particle beams, light irradiation, micromachining, colloidal processing...) and up-to-date characterization of structure, non-linear optical properties, tunability, nanosize effects etc. of novel inorganic photonic materials systems for light generation, detection, and manipulation including e.g. luminescent and laser materials, smart optical fibres, active plasmonic heterostructures, novel confined nano-micro structures etc. covering the UHV-IR electromagnetic spectrum.
Contributions from Academia and industry on upgraded or novel application and prospective new approaches to photonic-based technologies are also firmly encouraged.

http://2018.cimtec-congress.org/symposium_cl

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