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Roberto Morandotti

Prof. Roberto  Morandotti


1650 Boul. Lionel Boulet

Varennes QC D-07745

tel: +1-450-9298124
fax: +1-450-9298102
E-mail: morandotti@emt.inrs.ca
Web: http://www.emt.inrs.ca/

Area of Expertise

Nonlinear optics, Integrated optics, Thz science and Applications


Roberto Morandotti received a M.Sc. in Physics from the University of Genova (Italy) in 1993, and a Ph.D. degree from the University of Glasgow (Scotland) in 1999. From 1999 to 2001, he was with the Weizmann Institute of Science, Rehovot, Israel, and from 2002 to 2003, he was with the University of Toronto, Toronto, ON, Canada, where he worked on the characterization of novel optical structures. In June 2003, he joined the Institut National de la Recherche Scientifique-Centre Energie, Materiaux et Telecommunications (INRS-EMT), Universite´ du Quebec, Montreal, QC, Canada, where he has been a Full Professor since 2008. He is the author and coauthor of more than 350 papers in international scientific journals and conferences (including over 30 contributions to Physical Review Letters, Nature Photonics and Nature Communication). His research interests deal with the linear and nonlinear properties of various structures for integrated optics, with the study of novel thin film based technologies for optoelectronics applications as well as with nonlinear optics at unusual wavelengths. Dr. Morandotti is currently serving and/or has served as a Technical Committee Member and a Chair for several Optical Society of America (OSA), Lasers and Electro-Optics Society, IEEE and SPIE meetings. He is an E.W.R. Steacie Memorial Fellow (the most prestigious award for young scientists in Canada), a Fellow of the OSA, a Fellow of the Institute of Nanotechnology, and an elected member of the Sigma Xi (the Scientific Research Society).

Lecture Title(s)

Optical Parametric Oscillators and Ultrafast, Ultrastable Lasers Based on CMOS Compatible Microring Resonators: Stable, ultra high repetition rate, optical clocks are critical for many applications in high speed communications, signal processing and metrology. The recent realization of multiple wavelength oscillators based on high Q-factor resonators has profoundly impacted optical frequency combs for metrology and precision measurements and other areas. The ability to modelock these devices would raise the possibility of achieving high precision optical clocks in a monolithic format, offering enormous benefits in performance, cost, size, and power consumption for optical waveform synthesis, high capacity telecommunications, optical analogue to digital conversion and many other applications. Here, we demonstrate the first modelocked laser based on a monolithic high Q resonator, and in a CMOS compatible platform. By exploiting a new approach towards modelocking that we term Filter-Driven Four Wave Mixing, this device produces extremely stable, self starting transform limited optical pulses at 200.3GHz, with a sub-100kHz linewidth and extremely narrow amplitude noise bandwidth.

Integrated all Optical Oscilloscopes: The recent introduction of coherent optical communications has created a compelling need for ultra-fast phase-sensitive measurement techniques operating at milliwatt peak power levels and in time scales ranging from sub-picoseconds to nanoseconds. Previous reports of ultrafast optical signal measurements in integrated platforms include time-lens temporal imaging on a silicon chip and waveguide-based frequency-resolved optical gating (FROG) Time-lens imaging is phase insensitive while FROG methods require long integrated tuneable delay lines - still an unsolved challenge. In this talk, I will illustrate a monolithic device capable of characterizing both the amplitude and phase of ultrafast optical pulses with the aid of a synchronized incoherently-related clock pulse. It is based on a novel variation of SPIDER t hat exploits four-wave-mixing (FWM) in a CMOS compatible chip. We measure pulses with <100mW peak power, a frequency bandwidth >1THz, and up to 100ps pulsewidths, yielding a time-bandwidth product (TBP) >100.

The Dawn of Nonlinear Optics in the THz regime: Ultrafast nonlinear processes have been extensively explored in the visible and near infrared frequency range, thanks to the availability of ultrashort pulses delivered by mode-locked lasers. Here, the combination of high excitation intensities together with a very fine temporal resolution have shed new light on diverse aspects of condensed-matter dynamics. On the other hand, this kind of phenomena has remained relatively unexplored in the THz spectral region (typically 0.1-10 THz), mainly because of the lack of sources delivering high-energy, few-cycle THz pulses. Nowadays, this kind of sources is becoming available, thus opening the route towards the understanding of new aspects of radiation-matter interaction.Thanks to some of those sources, recently developed by our group, we were capable to study the nonlinear dynamics of free-carriers in direct bandgap semiconductors at terahertz (THz) frequencies using high power, few-cycle pulses. The physical mechanisms that give rise to such dynamics and the realization of its nonlinear applications, will be discussed in details.

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