Transcript Experimental and Theoretical Analysis for Optical Induced

Experimental and Theoretical
Analysis for Optical Induced
Thermal Energy Transport in NanoOptical Systems with Pulsed Light
Sources
Chris Greco - Hearne ISD - Hearne, TX
Faculty Mentor:
Dr. Sy Bor Wen
Mechanical Engineering, Texas A&M
Faculty Mentor
Dr. Sy-Bor Wen
Assistant Professor
Texas A&M University
Education
Ph.D. Mechanical Engineering, University of California at Berkeley, CA 2006
M.S. Mechanical Engineering, National Taiwan University, Taipei, Taiwan, 1999
B.S. Mechanical Engineering, National Taiwan University, Taipei, Taiwan, 1997
Research
Dr. Wen is interested in designing and conducting experiments in micro to nano scale energy
transfer and mass removal along with constructing theoretical analyses to explain and predict
experimental results.
 Working on using lasers to ablate germanium and copper and condense them together to
form a nanoparticle core-shell material that has superior optical and electromagnetic properties
 Measuring temperature via thermal reflectance, a non-contact method
 Using nano patterning to create zone plates to study light focusing via diffraction
http://www2.mengr.tamu.edu/FacultyProfiles/facultyinformation.asp?LastName=syborwen
Graduate Students
Vijay M. Sundaram
M.S., Mechanical Engineering, Texas A&M
University 2010
B.Tech, Mechanical Engineering, National
Institute of Technology, Trichy 2008
Alok Soni
M.Tech, Mechanical Engineering, Indian
Institute of Technology, Bombay India 2003
B.Tech, Mechanical Engineering, National
Institute of Technology, Raipur India 2001
Future Additions
YoungKyong Jo
Unknown at this time, returns in 1 week
What’s it mean?
This
 Nano/Micro Fabrication
 Creating nano-devices
 Medical Surgery
 Nano-machines/precise targeting of cells
 Chemical Analysis
 Spectroscopy at the nano scale
 Microscopy/Imaging
 Material Characterization
http://www.optoiq.com/index/biophotonics/display/bo
w-article-display/articles/optoiq2/biophotonics/specialties-/cell-biology_/2010/1/femtosecond-lasersmake-single-cell-nanosurgery-a-reality.html
Not This
How are they getting there?
 Leading edge research
 Engineering solutions to
issues as they arise
 Research in the lab is
working toward nano
devices to manipulate
materials on the nanoscale.
Background
 L.A.S.E.R  Light Amplification Stimulated by
the Emission of Radiation
 Laser Ablation  From
Wikipedia: the process of
removing material from a
solid (or occasionally
liquid) surface by
irradiating it with a laser
beam. Usually, laser
ablation refers to removing
material with a pulsed
laser, but it is possible to
ablate material with a
continuous wave laser
beam if the laser intensity
is high enough.
 Generating differing types of nano particles
Using laser ablation
 Using thermal reflectance as a non-contact
measuring tool to find temperature
 Via time resolved interferometry
 Determining the effectiveness of a zone plate
as a lead in to creating nano-optic devices
Experimental research in nano patterning
Experiment: Laser Ablation
 generating different
types of nano particles
through changing the
combination of target
materials, laser
parameters and
background gas
conditions.
Excimer Laser
Nd: YAG laser – class IV laser
(neodymium-doped yttrium aluminum
garnet) 532 nm= green light
The main objective in
creating nano particles
via laser ablation
include:
 provides more
flexibility over chemical
methods to fabricate
nano particles
 Faster
 economical
Experiment
We will be using the laser
to ablate materials
while changing:
 Sampling position/area
 Gas type/flow within
the chamber
 Laser energy
 Materials to be ablated
Courtesy of YoungKyong Jo
Data Analysis
 We will analyze the
experimental results
(measured with electron
microscopes) in order to
determine the
contribution of physical
parameters on the size
and shape of nanoparticles generated from
microscale laser ablation.
Modified Sagnac Interferometer
 Will allow for the non
contact measurement
of temperature of the
nsom probe during
pulsed heating through
the nano second laser
 Will be compared to
existing simulations of
Dr. Wen’s
David et al, optic letters 1999
Nano-Patterning via Zone Plate
 Designing of nano-optic
devices based on zone
plates to achieve subdiffraction spot size
 Nano-patterning of
materials
 Nano scale chemical
analysis
 Medical Application
 Ablation of cells/tissue
Images Courtesy of Vijay M. Sundaram
How will the research impact our lives?
 Nano/Micro
Fabrication
 Medical Surgery
 Chemical Analysis
 Microscopy/Imaging
Material
Characterization
Flashback
 Creating nano particles
with laser ablation
 Measuring temp with
non-contact methods
 Exploring using zone
plates to focus light
below Rayleigh’s limit
Dr. Wen adds to my reading load
My possible class lesson
 Using lasers, mirrors an
interferometer, and a
semi-vacuum chamber I
plan to set up an
experiment to allow my
students to study
interference patterns in
order to experimentally
discover the refraction
index of air
Acknowledgements
National Science Foundation (NSF)
 Nuclear Power Institute (NPI)
 Texas Workforce Commission (TWC)
 Chevron
 E3
 Dr. Wen and his research staff
Questions?