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

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 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,

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?  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 w-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.laser continuous wave

 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 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 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?