Presentations

    Ultrafast laser microtexturing of silicon for optoelectronic devices, at Photonics West: Commercial and Biomedical Applications of Ultrafast Lasers (San Jose, CA), Thursday, January 24, 2002:
    Arrays of sharp, conical microstructures are obtained by texturing the surface of a silicon wafer using femtosecond laser-assisted chemical etching. The one step, maskless texturing process drastically changes the optical and electronic properties of the original silicon wafer. These properties make the textured silicon viable for use in a wide range of commercial devices. Near-unity absorption of light, from visible to infrared wavelengths, offer opportunities for use in optically active devices such as solar cells and detectors. Significant enhancement of below-band-gap photocurrent... Read more about Ultrafast laser microtexturing of silicon for optoelectronic devices
    Ultrafast laser-processing of materials, at APS March Meeting (Indianapolis, IN), Monday, March 18, 2002:
    The dielectric function response of Te to ultrashort pulse laser excitation reveals oscillatory behavior in the bonding-antibonding split due to the presence of coherent phonons, suggesting a THz-driven semiconductor-semimetal transition.
    Femtosecond laser micromachining of transparent materials for photonics and biology, at International Symposium on Photonic Glasses 2002 (Shanghai, China), Tuesday, October 15, 2002:
    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 of transparent materials for photonics and biology
    Femtosecond laser-assisted microstructuring of silicon surfaces for novel detector, sensing, and display technologies, at Department of Physics Seminar, Fudan University (Shanghai, China), Wednesday, October 16, 2002:
    Arrays of sharp, conical microstructures are obtained by texturing the surface of a silicon wafer using femtosecond laser-assisted chemical etching. The one step, maskless texturing process drastically changes the optical and electronic properties of the original silicon wafer. These properties make the textured silicon viable for use in a wide range of commercial devices. Near-unity absorption of light, from visible to infrared wavelengths, offer opportunities for use in optically active devices such as solar cells and detectors. Significant enhancement of below-band-gap photocurrent... Read more about Femtosecond laser-assisted microstructuring of silicon surfaces for novel detector, sensing, and display technologies
    Memorization or understanding: Are we teaching the right thing?, at Physics Colloquium, University of Strathclyde (Glasgow, United Kingdom), Monday, November 11, 2002:
    Education is more than just transfer of information, yet that is what is mostly done in large introductory courses -- instructors present material (even though this material might be readily available in printed form) and for students the main purpose of lectures 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. Students get frustrated because they are unable to grasp simple concepts. Instructors get... Read more about Memorization or understanding: Are we teaching the right thing?
    Femtosecond laser-assisted microstructuring of silicon for novel detector, sensing, and display technologies, at IEEE/LEOS 2002 Conference on Electro-Optic Sensors and Systems (Glasgow, Scotland), Monday, November 11, 2002:
    Arrays of sharp, conical microstructures are obtained by texturing the surface of a silicon wafer using femtosecond laser-assisted chemical etching. The one step, maskless texturing process drastically changes the optical, material and electronic properties of the original silicon wafer. These properties make the textured silicon viable for use in a wide range of commercial devices. First, near-unity absorption of light, from visible to infrared wavelengths, offer opportunities for use in optically active devices such as solar cells and detectors. Significant enhancement of below-band-gap... Read more about Femtosecond laser-assisted microstructuring of silicon for novel detector, sensing, and display technologies
    Educational Activities, at DEAS Industrial Outreach Workshop, Harvard University (Cambridge, MA), Thursday, April 10, 2003:
    The Center actively promotes interdisciplinary education and outreach through a variety of initiatives. Participants contribute to outreach to the general public through collaboration with the Boston Museum of Science, outreach to K-12 in-service teachers, research experiences for undergraduates and K-12 teachers, interdisciplinary courses for graduate students, and postdoctoral fellowships for women and minorities. The program involves faculty, postdoctoral fellows, collaborators and graduate students associated with the Center and benefits a broad constituency of society.
    Nano-textured Surfaces, at DEAS Industrial Outreach Workshop, Harvard University (Cambridge, MA), Friday, April 11, 2003:
    Arrays of sharp, conical microstructures are obtained by texturing the surface of a silicon wafer using femtosecond laser-assisted chemical etching. The one step, maskless texturing process drastically changes the optical, material and electronic properties of the original silicon wafer. These properties make the textured silicon viable for use in a wide range of commercial devices. First, near-unity absorption of light, from visible to infrared wavelengths, offer opportunities for use in optically active devices such as solar cells and detectors. Second, chemical functionalization of the... Read more about Nano-textured Surfaces
    Memorization or understanding: Are we teaching the right thing?, at 2003 Education and Training in Optics and Photonics (Tucson, AZ), Wednesday, October 8, 2003:
    Education is more than just transfer of information, yet that is what is mostly done in large introductory courses. Few students have the ability, motivation, and discipline to synthesize all the information delivered to them. "Peer Instruction" shifts the focus in lectures from delivering information to synthesizing information and achieves remarkable improvements in student understanding.

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