[UCI-Calit2] Upcoming lecture: Silicon Nanostructures to Enable Silicon Photonics

Anna Lynn Spitzer aspitzer at rgs.uci.edu
Tue Jan 17 11:21:52 PST 2006


Title:                                       Silicon Nanostructures to
Enable Silicon Photonics

 

Speaker:                               Lorenzo Pavesi, professor of
experimental physics, University of Trento (Italy)

 

Time:                                     2-3:30 p.m.

 

Date:                                      Tuesday, Jan. 24, 2006

 

Location:                              McDonnell Douglas Engineering
Auditorium, UC Irvine 

 

Abstract:                               In his talk, Pavesi will review
the photonic applications of nanostructured silicon. As the
dimensionality of silicon changes, fascinating and new optical
properties of the material appear. In particular, light emission starts
to be a very efficient process in nanostructured silicon and
light-emitting diodes with efficiency in excess of one percent have been
fabricated. Optical amplification has been also observed when silicon
nanocrystals are embedded into a dielectric matrix. This makes the
system a potential candidate for laser action. In addition to electronic
property variations, nanostructured silicon can be also used as a
nanodielectric material, where controlled changes in the refractive
index can lead to trapping or slow down of photons. Some examples will
be discussed where photonic Bloch oscillations, photonic Zener
tunnelling and high quality microcavities are demonstrated. All these
various phenomena pave the way to a new field of applications for the
"old dog" of microelectronics.

 

Bio:                                        Lorenzo Pavesi received his
doctorate in physics in 1990 at the Ecole Polytechnique Federale of
Lausanne (Switzerland). In 1990, he became assistant professor; in 1999,
associate professor; and in 2002, full professor at the University of
Trento. He leads the nanoscience laboratory and teaches several classes
in the science and engineering departments. He founded the research
activity in semiconductor optoelectronics at the university and started
several laboratories of optical spectroscopy, growth and advanced
treatment of materials. Recently, he has concentrated on Si-based
optoelectronics, specifically porous silicon and silicon nanostructures.
Among his most important achievements are the demonstration of the first
all-porous silicon optical microcavity, the fabrication of Si LED in a
fully CMOS-compatible environment, the first evidence of optical gain
and stimulated emission in Si quantum dot nanocrystals, the observation
of photonic Bloch oscillations and Zener tunneling. All of these results
opened the way to Si-based optoelectronics and to the future fabrication
of a Si-based laser. Pavesi has authored several reviews and one book,
authored or co-authored more than 250 papers, edited eight books, and
holds five patents. 

 

Additional Information:     Sponsored by the Institute for Surface and
Interface Science (ISIS); faculty host is Chen Tsai.

 

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