Presentations

    Femtosecond Laser Micromachining: Applications in Technology and Biology, at 2005 SPIE Photonics West Conference, Symposium OE04: Ultrafast Phenomena in Semiconductors and Nanostructure Materials IX (San Jose, CA), Wednesday, January 26, 2005:
    When femtosecond laser pulses are focused tightly into a transparent material, the intensity in the focal volume can become high enough to cause nonlinear absorption of laser energy. The absorption, in turn, can lead to permanent structural or chemical changes. Such changes can be used for micromachining bulk transparent materials. Applications include data storage and the writing of waveguides and waveguide splitters in bulk glass, fabrication of micromechanical devices in polymers, and subcellular photodisruption inside single cells. In this talk we will review recent results obtained in... Read more about Femtosecond Laser Micromachining: Applications in Technology and Biology
    Optical waveguide fabrication for integrated photonic devices, at Optical and Electronic Device Technology for Access Network: Nanophotonics and functional device technology (San Jose, CA), Thursday, January 27, 2005:
    The dynamic nature of future optical networks requires high levels of integration, fast response times, and adaptability of the optical components. Laser micromachining circumvents the limitations of planar integration, making three-dimensional integration possible and allowing dense packaging of optical devices with no alignment requirements. Femtosecond micromachining provides the analog of circuit printing by wiring light between various photonic devices as well as printing the actual photonic device into a single or various substrates. Oscillator-only machining has several advantages over... Read more about Optical waveguide fabrication for integrated photonic devices
    Femtosecond laser micromachining, at French-Israeli Symposium on Non-linear and Quantum Optics (Ein Bokek, Israel), Wednesday, February 23, 2005:
    When femtosecond laser pulses are focused tightly into a transparent material, the intensity in the focal volume can become high enough to cause nonlinear absorption of laser energy. The absorption, in turn, can lead to permanent structural or chemical changes. Such changes can be used for micromachining bulk transparent materials. Applications include data storage and the writing of waveguides and waveguide splitters in bulk glass, fabrication of micromechanical devices in polymers, and subcellular photodisruption inside single cells.
    Femtosecond laser micromachining: Applications in Technology and Biology, at The 8th International Conference on Laser Ablation (Banff, Canada), Monday, September 12, 2005:
    When femtosecond laser pulses are tightly focused into a transparent material, the intensity in the focal volume is high enough to cause absorption through nonlinear processes. The absorption of the laser energy excites a submicrometer-sized region of plasma inside the material, and the energy is subsequently transferred to the atoms in the form of heat and shock waves. This process permanently alters solids and ablates cellular structures in biological media [1]. Applications include high-density data storage in three dimensions, writing of waveguides and waveguide splitters in bulk glass,... Read more about Femtosecond laser micromachining: Applications in Technology and Biology
    Fundamentals and Applications of Femtosecond Laser Micromachining of Glass, at First Conference on Advances in Optical Materials (Tucson, AZ), Wednesday, October 12, 2005:
    When femtosecond laser pulses are focused tightly into a transparent material, the intensity in the focal volume can become high enough to cause nonlinear absorption of laser energy. The absorption, in turn, can lead to permanent structural or chemical changes. Such changes can be used for micromachining bulk transparent materials. Applications include data storage and the writing of waveguides and waveguide splitters in bulk glass, fabrication of micromechanical devices in polymers, and of all-optical sensors.
    Materials Processing Using Ultrashort Laser Pulses, at OSA Frontiers in Optics Meeting (Tucson, AZ), Wednesday, October 19, 2005:
    Ultrashort laser pulses are an important new tool in materials processing. We will discuss the physics of short-pulse laser interactions with materials and applications in micromachining and biotechnology.
    Femtosecond laser micromachining, at Photonics West 2006 (San Jose, CA), Tuesday, January 24, 2006:
    When femtosecond laser pulses are focused tightly into a transparent material, the intensity in the focal volume can become high enough to cause nonlinear absorption of laser energy. The absorption, in turn, can lead to permanent structural or chemical changes. Such changes can be used for micromachining bulk transparent materials. Applications include data storage and the writing of waveguides and waveguide splitters in bulk glass, fabrication of micromechanical devices in polymers, and subcellular photodisruption inside single cells.
    Femtosecond laser micromachining, at 1st International Workshop on Multiphoton Processes in Glass and Glassy Materials, University of Sydney (Sydney, Australia), Monday, December 11, 2006:
    When femtosecond laser pulses are focused tightly into a transparent material, the intensity in the focal volume can become high enough to cause nonlinear absorption of laser energy. The absorption, in turn, can lead to permanent structural or chemical changes. Such changes can be used for micromachining bulk transparent materials. Applications include data storage and the writing of waveguides and waveguide splitters in bulk glass, fabrication of micromechanical devices in polymers, and subcellular photodisruption inside single cells.
    Femtosecond laser micromachining for applications in microphotonics, at E-MRS Meeting (Strassbourg, France), Thursday, June 11, 2009:
    When femtosecond laser pulses are focused tightly into a transparent material, the intensity in the focal volume can become high enough to cause nonlinear absorption of laser energy. The absorption, in turn, can lead to permanent structural or chemical changes. Such changes can be used for micromachining bulk transparent materials. Applications include data storage and the writing of waveguides and waveguide splitters in bulk glass, fabrication of micromechanical devices in polymers, and subcellular photodisruption inside single cells.
    Applications of femtosecond lasers in materials processing, at Conference on Lasers and Electro-Optics Europe (Munich, Germany), Wednesday, June 17, 2009:
    Chemical bonding, phase transitions, and surface processes occur on timescales comparable to the natural oscillation periods of atoms and molecules, in the range of femtoseconds (1 fs =10�15 s) to picoseconds (1 ps = 10�12 s). Advances in the generation of ultrashort laser pulses in the past two decades have made it possible to directly observe these fundamental processes. These advances have taken us from the picosecond timescale a generation ago, to the femtosecond timescale in the past decade, and recently into the attosecond (1 as = 10�18 s) regime. Materials science,... Read more about Applications of femtosecond lasers in materials processing
    Direct writing of metallic structures for metamaterial applications, at Tri-Service Metamaterials Review (Virginia Beach, VA), Wednesday, May 26, 2010:
    Ultrafast-laser micromachining allows for 3D fabrication of structures much smaller than the diffraction limited laser spot size in transparent media such as glass. Under a linear regime, the media does not absorb light at the operating wavelength of the laser. However, using ultrafast pulses, we can obtain material modification through non-linear absorption. The technique can also be used to induce chemical reactions. High intensity femtosecond laser pulses can induce the photoreduction of metal ions through non-linear absorption. We use solutions containing metal salts to grow metal... Read more about Direct writing of metallic structures for metamaterial applications
    Femtosecond laser micromachining of transparent materials, at Topical Meeting on Bragg Gratings, Photosensitivity and Poling in Glass Waveguides (Karlsruhe, Germany), Monday, June 21, 2010:
    When femtosecond laser pulses are focused tightly into a transparent material, the intensity in the focal volume can become high enough to cause nonlinear absorption of laser energy. The absorption, in turn, can lead to permanent structural or chemical changes. Such changes can be used for micromachining bulk transparent materials. Applications include data storage and the writing of waveguides and waveguide splitters in bulk glass, fabrication of micromechanical devices in polymers, and subcellular photodisruption inside single cells.
    Visualizations and visual illusions: how the mind tricks us, at NATO ASI Course on New developments in optics and related fields: modern techniques, materials, and applications, Centro Ettore Majorana (Erice, Italy), Saturday, June 11, 2005:
    Neurobiology and cognitive psychology have made great progress in understanding how the mind processes information – in particular visual information. The knowledge we can gain from these fields has important implications for the presentation of visual information and student learning.
    Gender, interactive teaching, and barriers to change, at Women in Science and Engineering Workshop, Thomas Jefferson National Accelerator Facility (Newport News, VA), Monday, November 16, 2009:
    Can pedagogy alleviate the well-known "gender gap" in performance and representation in the physical sciences? I will show that women can succeed on par with male students in introductory classes that are taught cooperatively, rather than competitively. At the same time we found that the level of perceived confusion increases in classes that challenge every student to think about and respond to questions asked during class. This increase is a potential barrier to reform even though we have shown it to anti-correlate with performance.
    Laser-induced microexplosions: ultrafast physics with clinical applications, at 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (Hong Kong), Thursday, October 29, 1998:
    We used water and human skin tissue to compare the surgical potential of 100-fs and 200-ps laser pulses. For investigation of threshold behavior of 100-fs and 200-ps pulses, we use water as a model for tissue. In addition to having a lower threshold, we find that energy deposition is much more consistent with 100-fs pulses. We also compared 100-fs and 200-ps laser pulse effects on the surface and in the bulk of human skin tissue. On the surface, pulses with 100-fs and 200-ps duration leave similar size ablation regions. In the bulk both 100-fs and 200-ps pulses produce cavities, however, 100-... Read more about Laser-induced microexplosions: ultrafast physics with clinical applications
    Subcellular surgery and nanosurgery, at CIMIT/Lester Wolfe Workshop on Femtosecond Microscopy & Microsurgery, Wellman Center for Photomedicine (Boston, MA), Tuesday, April 18, 2006:
    We use femtosecond laser pulses to manipulate sub-cellular structures inside live and fixed cells. Using only a few nanojoules of laser pulse energy, we are able to selectively disrupt individual mitochondria in live bovine capillary epithelial cells, and cleave single actin fibers in the cell cytoskeleton network of fixed human fibro-blast cells. We have also used the technique to micromanipulate the neural network of C. Elegans, a small nematode. Our laser scalpel can snip individual axons without causing any damage to surrounding tissue, allowing us to study the function of individual... Read more about Subcellular surgery and nanosurgery
    Subcellular surgery and nanosurgery, at CLEO 2007 (Baltimore, MD), Thursday, May 10, 2007:
    We use femtosecond laser pulses to probe the mechanical propertiesof the actin network in live cells and to probe cell regeneration and the neurological basis of behavior in C. elegans.

Pages