National Science Foundation Center for Lasers and Plasmas for Advanced Manufacturing. Mool C. Gupta Applied Research Center Old Dominion University
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1 National Science Foundation Center for Lasers and Plasmas for Advanced Manufacturing Mool C. Gupta Applied Research Center Old Dominion University
2 National Science Foundation Center - Center Mission - Develop Science, Engineering and Technology Base for Laser and Plasma Processing of Materials, Devices and Systems for Advanced Manufacturing
3 Partnership Industry Fed. Labs Projects Univ. Overhead & Membership Facility Membership Funds & National CIT Membership State NSF Recognition
4 Industrial Advisory Board Members Science & Technology Corp. Spectra Physics NASA Langley Research Center Philip Morris Framatome ANP Jefferson Lab Economic Development Authority of the City of Newport News Virginia s Center for Innovative Technology Luna Innovations Materials Modification Inc. Vistakon
5 PROJECTS Projects Primary Interest Effect of Fs pulse width on micromachining (Spectra Physics) Laser induced compressive stresses (Framatome) Plasma Processing (CIT, EDA) Nanocatalysts for CO oxidation (Philip Morris) Nanostructures and Electron emission (Jefferson Lab) Carbon Nanotubes for EM Shielding (NASA-Langley, STC) Fullerenes (Luna Innovations) Nanoparticles (MMI) Optical Surfaces (Vistakon)
6 ADDITIONAL RESEARCH Laser Crystallization of a-si for Solar Cells (NSF & BPSolar) Laser Crystallization of Diamond like Carbon Films (Anatech,CIT) Butterfly Color Formation (Alcoa Corporation) Laser Texturing for Adhesion of Shape Memory Alloys (NASA) nm VUV Lamp Source for Lithography (DARPA) BST Nanoparticles by Ablation for Microwave devices (to Army) Lasers for Art Cleaning & Preservation (to Dept. of Interior) Laser Hardening of Sensors (submitted to AFOSR) Fs laser holography,tera Hertz Applications and Electro-Optic Beam Scanner
7 Nanostructures & Electron Emission Primary Interest: Jefferson Lab. FEL High Charge > 1 nc; Polarization not important Pulse Duration~ ps; I~ 100 ma Energy~ fraction of MeV; Emittance ~ 1 mm mrad Nuclear Physics Low Charge ~ 1 nc; Polarization~ 80% Pulse duration < 1 ps; I~ 100 µa Energy~fraction of MeV; Emittance not important
8 Nanostructures & Electron Emission Carbon Nanotubes Current Density: A/cm 2 Emission Pulse width: Picosecond Repetition Rate: MHz Emission Area: > 1 cm 2 Dong, Xu and Gupta
9 Carbon Nanotube Electron Emission Imaging from CNT ITO Film Phosphor CNT Dong, Myneni and Gupta
10 RESULTS LINE STRUCTURE Still picture of single-pass cutting on Silicon τ p = 110fs τ p = 500fs τ p = 1ps Chien & Gupta τ p = 5ps τ p = 10ps
11 RESULTS LINE STRUCTURE * Laser cutting on E = 10 µj pass 5-pass 10-pass Pulse width (ps) pass 5-pass 10-pass Pulse width (ps) Chien & Gupta
12 LASER PEENING SET UP Bugayev and Gupta
13 X-RAY DIFFRACTION PATTERN of 316L 16 DIFFRACTED BEAM (a.u.) [111] [200] STEEL 316L before LSP after LSP [220] Θ (degree) Bugayev and Gupta
14 Fs Laser Holography Bugayev and Gupta
15 Fs Laser Holography 0.48 mm Bugayev and Gupta
16 Balance photodiode Input laser Probe beam Xu and Gupta
17 7 Power Absorption Spectrum 6 Room temperature water vapor Frequency (THz) Xu and Gupta
18 Aim: To improve the efficiency of Si solar cells. Diode Laser Laser Crystallization of a-si:h Set up Method: Crystallize a-si:h using a semiconductor laser. Diode Array Laser Beam Path Focusing Lens a-si:h film Sponsor: National Science Foundation Result CPS [a.u] Advantages: - Manufacturing Compatibility -Solar cell Stability. [111] 2θ XRD of crystallized Si Nayak & Gupta
19 Butterfly Color Formation Wong and Gupta
20 Butterfly Surface under SEM Wong and Gupta
21 Grating Fabrication Wong and Gupta
22 121.6 nm VUV Lamp Chamber for MIT-Lincoln Lab RF Input VUV Radiation for Materials Processing Si Detector Discharge Chamber Gas Input Spectra Pressure = 500 Torr Flowrate = 900 Sccm 0.058% H2 RF = 60 W 10 5 Yan and Gupta Wavelength (nm) Supported by DARPA
23 Some Experiments on Plasma Interaction with Materials RF input power 150W, Ar silicon plate 0.5mm T = 1683 K Akhmerov and Gupta
24 Yang and Gupta Plasma Modification of Surfaces Rotary stage Polymer film Plasma jet Roller
25 Plasma Processing Oxygen Treated Untreated PET Fluorochemical Yang, Mohajer and Gupta Teflon
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