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Dr.
Jim Spicer
Laser-Materials Interaction
Laser light interactions with materials can result in a wide
variety of material responses owing to the large variation of
photon fluxes that are attained using a range of laser systems.
By exciting materials appropriately, many different materials
characterization, processing and synthesis operations can be
carried-out. For processing, laser machining, laser thermal
treatment, pulsed laser deposition and laser plume chemistry
can all be performed by selecting appropriate laser characteristics
(wavelength, pulse energy and pulse duration) and taking into
account the relevant material properties (optical, thermal and
chemical). Laser-based characterization is similarly wide-ranging
owing to our ability to manipulate laser light sources. Lasers
have proven to be useful tools for measuring the properties
of materials. While optical characterization is obvious, laser-based
methods are routinely used to measure thermal and elastic energy
transport, electron-phonon coupling as well as elucidate other
less well defined nonequilibrium energy transfer mechanisms
in materials. Laser methods have also been used to produce secondary
radiation, such as x-rays and terahertz radiation, that can
also be used for materials characterization studies.
Our group has been pursuing research in these areas and is
currently active in the following:
- Ultrafast acoustic and thermal transport in thin films and
polymer matrix nanocomposite materials.
- Femtosecond laser induced breakdown spectroscopy for surface
adsorbed species identification.
- Terahertz propagation and spectroscopy for characterization
of porous and multiscale materials.
- Mesoscopic ultrasonic effects to elucidate fundamental response
of microstructural elements under transient stress states.
- Nonlinear optical responses of nanoparticulate materials
at high and low optical fluences.
Dr. Paul Dagdigian
Professor Dagdigian's research is centered in two general research
areas: the dynamics of gas-phase molecular interactions and
the development of laser diagnostics for the detection of transient
and trace species.
Center: Center
for Materials Sensing and Detection
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Dr. Robert Osiander
Dr. Osiander’s current research interests include Micro-Electro-Mechanical
Systems (MEMS) in Sensors, Communications, Thermal Control,
and Space, Nanotechnology with a focus on Carbon Nanotubes
for electronics and thermal control applications, and Terahertz
Imaging and Spectroscopy for landmine and explosives detection.
Dr. Joseph A. Miragliotta
Dr. Miragliotta’s current research interests include the
development
of Raman and fluorescence sensors for the detection of biological
and chemical agents. In addition to optical technologies,
Dr. Miragliotta's is investigating the use
of nanoprobes for intracellular investigations, and Terahertz
Imaging and Spectroscopy for landmine and explosives detection.
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Dr.
Xi-Cheng Zhang
Professor Zhang's work with time-domain THz spectroscopy systems
holds promise for diagnostics of materials such as semiconductors
and biomolecules. THz time-domain spectroscopy uses short pulses
of broadband THz radiation, typically generated using ultrafast
laser pulses. The transmitted THz electric field is measured
coherently, which provides both high sensitivity and time-resolved
phase information.
Dr. Roland Kersting
Professor Kersting's group is working on the fabrication of
THz heterostructure devices. The fabricated devices are characterized
by exciting them with ultra-fast THz signals, then measuring
their response directly in time-domain. Kersting's lab has also
demonstrated modulators and resonances as high as 3.0 THz as
well as THz differentiators, which give instantaneous derivative
in time-domain of incoming signals.
Center: RPI
Center for Terahertz Research
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Dr.Dave
Crosley
Dr. Crosley’s areas of focus include laser-induced fluorescence
spectroscopy, collisional energy transfer, laser flame diagnostics,
gas phase chemical kinetics, and atmospheric monitoring. Dr.
Crosley's research assignments at SRI have included laser spectroscopy
and diagnostics techniques for combustion, chemical kinetics,
materials processing, and atmospheric monitoring.
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