Experimental and Theoretical Analysis for Optical Induced
Thermal Energy Transport in Nano-Optical Systems with Pulsed Light
Sources
Faculty Mentor:Dr. Sy Bor Wen
Mechanical Engineering, Texas A&M
Chris Greco - Hearne ISD - Hearne, TX
ResearchDr. 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
Faculty MentorDr. Sy-Bor WenAssistant ProfessorTexas A&M UniversityEducationPh.D. Mechanical Engineering, University of California at Berkeley, CA 2006M.S. Mechanical Engineering, National Taiwan University, Taipei, Taiwan, 1999B.S. Mechanical Engineering, National Taiwan University, Taipei, Taiwan, 1997
http://www2.mengr.tamu.edu/FacultyProfiles/facultyinformation.asp?LastName=syborwen
Graduate Students
Vijay M. SundaramM.S., Mechanical Engineering, Texas A&M University 2010B.Tech, Mechanical Engineering, National Institute of Technology, Trichy 2008
Alok SoniM.Tech, Mechanical Engineering, Indian Institute of Technology, Bombay India 2003B.Tech, Mechanical Engineering, National Institute of Technology, Raipur India 2001
Future Additions
YoungKyong JoUnknown at this time, returns in 1 week
What’s it mean?Nano/Micro Fabrication
Creating nano-devices Medical Surgery
Nano-machines/precise targeting of cells Chemical Analysis
Spectroscopy at the nano scale Microscopy/ImagingMaterial Characterization
http://www.optoiq.com/index/biophotonics/display/bow-article-display/articles/optoiq2/biophotonics-/specialties-/cell-biology_/2010/1/femtosecond-lasers-make-single-cell-nanosurgery-a-reality.html
This
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 nano-scale.
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 particlesUsing 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 devicesExperimental research in nano patterning
Three areas of emphasis during E3
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 Fastereconomical
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 nano-particles 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 sub-diffraction spot size
Nano-patterning of materials Nano scale chemical
analysisMedical 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/ImagingMaterial
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?