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?