NSTC/AMPAC/CREOL Distinguished Seminar Series: “The magic
of nonlinear laser processing: Nanostructuring inside thin films and shaping
multi-functional lab-in-fibre”- Peter Herman
Friday, May 1, 2015 11:00 AM to 12:00 PM
CREOL Room 102/103
CREOL Room 102/103
Celebrating the International Year of Light 2015
Peter R. Herman
Abstract:
The manipulation of femtosecond laser light inside
transparent media can be directed on varying interaction pathways of
microexplosions, photochemistry, and self-focusing filamentation to open new
directions for creating dense memory storage, three-dimensional (3D) optical
circuits, 3D microfluidic networks and high-speed scribing tracks. The
presentation follows these fundamental interactions towards controlling laser
processes in transparent glasses, particularly in optical fibers and thin films
that enable highly functional and compact devices to form with the benefits of
seamless integration with single mode optical fibers or microelectronic
chips. The concept of forming 3D optical circuits within the fiber
cladding is presented together with the means for coupling light efficiently
with the fiber core waveguide. Chemical etching of laser-generated nanogratings
are used to embed microfluidic channels, micro-optical devices and optical
resonator components. The laser writing overall provides a flexible
integration of fiber-cladding photonics and microfluidics on which to build 3D
opto-fluidic microsystems in our common base of optical networks through to
minimally invasive biomedical probes. The approach promises to reduce
fabrication and packaging costs and to enable highly functional all-fiber
microsystems for optical communications, fiber lasers, and sensing. Examples
of integrated approaches in lab-in-a-fiber devices, smart medical catheters,
and lab-in-film devices are presented.
Biography:
Peter R. Herman received the B.Eng. degree (1980) in
Engineering Physics at McMaster University. He earned MASc (1982) and PhD
(1986) degrees studying lasers and diatomic spectroscopy in the Physics
Department at the University of Toronto that followed with a post-doctoral
position at the Institute of Laser Engineering in Osaka University, Japan
(1987) to the study of laser-plasma physics and x-ray lasers. He joined the
Department of Electrical and Computer Engineering at the University of Toronto
in 1988 where he holds a full professor position. Professor Herman
directs a large and collaborative research group that develops and applies
laser technology and advanced beam delivery systems to control and harvest
laser interactions in new frontiers of 3-D nanofabrication. Our mantra
is: “We begin with light and we end with light devices.” To this
end we are inventing new methods for processing internally inside optical
materials that carve out highly compact and functional lightwave circuits,
microfluidics, optofluidic systems, biophotonic sensors, and smart medical
catheters. Our end goals are inventing new manufacturing processes and
extending optical device and Lab-on-a-chip concepts towards more compact
Lab-in-a-fiber and Lab-in-a-film microsystems. Professor Herman is OSA fellow,
holds several patents, spun out one company (FiLaser; acquired by Rofin 2014),
and has published over 300 papers in journals and conference proceedings.
For additional information:
Debashis Chanda
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