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Thursday, 30 Mayl 2024 |
Video-Recording for any system with MP4-support - Video.mp4 (ca. 450 Mb) |
15:15 – 16:30 |
"Multiphoton
Processes: Transforming an imaginative concept to
high-impact
technologies, from materials processing to biomedicine"
Prof.
Paras Prasad
(University at Buffalo)
Abstract:
The field of multiphoton processes, from
purely theoretical and imaginative concept
of two-photon absorption conceived by
Maria Goeppert Mayer -long considered
too weak to be of any practical significance-
has transformed to practical
applications in Multiphoton Technology.
This multidisciplinary field capturing
imagination and attention of scientists
and engineers worldwide has transformed
the science and technologies for Micro/
nanofabrication, optoelectronics,
nanophotonics and biophotonics. In this
talk the theoretical development and
multiscale modeling that made vital
contributions to fundamental understanding of
multiphoton nonlinear optical properties
of molecules and polymeric assemblies
at the very onset of the newly emerging
field of organic nonlinear optics will be
introduced. This has provided clear
pathways used in our laboratory to design and
produce organic and polymeric materials
with large two-photon absorption cross-
sections ,even achieving population
inversion leading to multiphoton lasing. Later
developments include the role of rich
density of low-lying intermediate states in
twisted geometry chromophores, a radically
new concept of metal cluster-mediated
microscopic cascading, and co-operative
enhancement in multibranched organic
systems to dramatically amplify
multiphoton processes.
Photoactive materials with large
two-photon absorption have enabled us to
demonstrate practical applications such as
3D microfabrication and high-density
data storage, and to introduce and
implement the concept of two-photon
photodynamic cancer therapy to treat thick
tumors. Multiphoton nonlinear
microscopy is playing a vital role in high
resolution and 3-D imaging of biological
structures and in advancing the emerging
field of Neurophotonics.
Some new directions in chiral contribution
to multiphoton processes in a chiral
polymeric medium in which electric and
magnetic moments are naturally coupled,
and multiphoton processes in an
epsilon-near-zero medium will also be presented.
The talk will conclude with a perspective
on future challenges and opportunities
in this burgeoning scientific field.
About the Speaker:
Prof. Prasad holds the multidisciplinary
position of SUNY Distinguished Professor
of Chemistry, Physics, Electrical
Engineering, and Medicine. He is the Samuel P.
Capen Chair of Chemistry and the Executive
Director of the multidisciplinary
Institute for Lasers, Photonics and
Biophotonics, which he founded in 1999.
His contributions in interdisciplinary
research at the interface of photonics,
nanotechnology, and biomedicine have
impacted healthcare, energy, and optical
technologies. Scientific American named
him among the world’s top 50 science and
technology leaders. His many awards for
research excellence include 2021 IEEE
Photonics Society William Streifer
Scientific Achievement Award; IEEE Pioneer
Award in Nanotechnology; the American
Chemical Society Peter Debye Award,
Morley Medal and the Schoellkopf Medal;
SPIE’s highest honor of Gold medal;
Optical Society Michael Feld Biophotonics
award; Western New York Health Care
Industries Technology/Discovery Award;
SUNY Excellence in the Pursuit of
Knowledge award; UB’s first Innovation
Impact award; UB President’s Medal;,
Guggenheim Fellowship; and Sloan
Fellowship. He is an elected foreign fellow of
the Brazilian Academy of Sciences, the
National Academy of Sciences, India, and
a fellow of the National Academy of
Inventors. He is a fellow of APS, Optica (OSA),
SPIE, and IEEE, and was listed among
Thompson Reuters “Highly Cited Researchers”
for 2014 & 2016. He has been awarded
Honorary Doctorates from KTH in Sweden,
Aix-Marseille University in France, MEPhI
in Russia, Federal University of
Pernambuco in Brazil and Indian Institute
of Technology, Jodhpur.