Presentations

    Ultrafast laser-induced structural and electronic changes in solids, at PIERS 1997 (Hong Kong), Tuesday, January 7, 1997:
    For over two decades the subject of laser-induced phase transitions in semiconductors has generated considerable interest. This interest is due to the technological importancee of semiconductors and the research in this field was in part driven by the hope of developing better methods for the annealing of ion-implated semiconductors. More recently, femtosecond laser pulses have made it possible to study highly non-equilibrium electron and lattice dynamics in seminconductors. In this talk we first present an overview of work on laser-induced structural and electronic changes in solids, and... Read more about Ultrafast laser-induced structural and electronic changes in solids
    Using short bursts of photons to manipulate biological matter at the nanoscale, at Winter Colloquium on the Physics of Quantum Electronics (Snowbird, UT), Friday, January 5, 2007:
    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 Using short bursts of photons to manipulate biological matter at the nanoscale
    Why teaching problem solving is a problem, at 2010 Science and Technology in Society Forum (Kyoto, Japan), Sunday, October 3, 2010:
    Of all the skills that are important in life in general and science, math and engineering education I n particular, the one that is most generally considered to be the most important one is problem solving. But what is problem solving? Problem solving is the process of moving toward a goal when the path to that goal is uncertain. The traditional approach to education largely fails to teach real problem solving. What can we do to address this problem?
    Wrapping light around a hair, at InternationalConference on Applications of Lasers and Electro-Optics 2004 (San Francisco, CA), Monday, October 4, 2004:
    Can light be guided by a fiber whose diameter is much smaller than the wavelength of the light? Can we mold the flow of light on the micrometer scale so it wraps, say, around a hair? Until recently the answer to these questions was ‘no’. We developed a technique for drawing long, free-standing silica wires with diameters down to 50 nm that have a surface smoothness at the atomic level and a very uniform diameter. Light can be launched into these silica nanowires by optical evanescent coupling and the wires allow low-loss single-mode operation. They can be bent sharply, making it possible to... Read more about Wrapping light around a hair
    Less is More: Extreme Optics with Zero Refractive Index, at CLEO/Europe EQEC 2017 (Munich, Germany), Tuesday, June 27, 2017
    By simultaneously controlling the electric and magnetic properties of a nanostructured composite material (metamaterial), we can create materials with a refractive index of zero. We present a novel on-chip platform to explore zero-index metamaterials.
    Extreme optics with zero-index metamaterials, at PQE 2020, Snowbird, UT, Tuesday, January 7, 2020:
    Nanotechnology has enabled the development of nanostructured composite materials (metamaterials) with exotic optical properties not found in nature. In the most extreme case, we can create materials which support light waves that propagate with infinite phase velocity, corresponding to a refractive index of zero. We have developed a variety of in-plane metamaterial designs that permit obtaining a refractive index of zero in the optical regime. We will report on some of the exotic physics of zero-index metamaterials, including strong enhancement of nonlinear optical phenomena
    Less is More: Extreme Optics with Zero Refractive Index, at International School on Light Sciences and Technologies, Universidad Internacional Menéndez Pelayo (Santander, Spain), Wednesday, June 21, 2017:
    Nanotechnology has enabled the development of nanostructured composite materials (metamaterials) with exotic optical properties not found in nature. In the most extreme case, we can create materials which support light waves that propagate with infinite phase velocity, corresponding to a refractive index of zero. This zero index can only be achieved by simultaneously controlling the electric and magnetic resonances of the nanostructure. We present an in-plane metamaterial design consisting of silicon pillar arrays, embedded within a polymer matrix and sandwiched between gold layers. Using an... Read more about Less is More: Extreme Optics with Zero Refractive Index
    Innovating education to educate innovators, at International School on Light Sciences and Technologies, Universidad Internacional Menéndez Pelayo (Santander, Spain), Friday, June 23, 2017:
    Can we teach innovation? Innovation requires whole-brain thinking — right-brain thinking for creativity and imagination, and left-brain thinking for planning and execution. Our current approach to education in science and technology, focuses on the transfer of information, developing mostly right-brain thinking by stressing copying and reproducing existing ideas rather than generating new ones. I will show how shifting the focus in lectures from delivering information to team work and creative thinking greatly improves the learning that takes place in the classroom and promotes independent... Read more about Innovating education to educate innovators
    Subcellular surgery and nanoneurosurgery, at CLEO-PR 2017 in Singapore, Thursday, August 3, 2017

     

    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...

    Read more about Subcellular surgery and nanoneurosurgery
    Flipping your class and never looking back, at AVID at Victoria University, Melbourne, Australia, Wednesday, September 15, 2021:

    Education is more than just transfer of information, yet that is what is mostly done in classrooms -- teachers present material (even though this material might be readily available in printed form) and for students the main purpose of classroom instruction is to take down as many notes as they can. Few students have the ability, motivation, and discipline to synthesize all the information delivered to them. Yet synthesis is perhaps the most important -- and most elusive -- aspect of education. I will show how shifting the focus in classroom learning from delivering information...

    Read more about Flipping your class and never looking back

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