Browsing by Author "Stockman, M.I."

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    Absolute phase effect in ultrafast optical responses of metal nanostructures
    (APPLIED PHYSICS A: MATERIALS SCIENCE & PROCESSING, 2007) Stockman, M.I.; Hewageegana, P.
    We predict that nonlinear ultrafast electron photoemission by strong optical fields and, potentially, other nonlinear optical responses of metal nanostructures significantly depend on the absolute (carrier?envelope) phase of excitation pulses. Strong enhancement of the local optical fields produces these responses at excitation intensities lower by order(s) of magnitude than for known systems. Prospective applications include control of ultrafast electron emission and electron injection into nanosystems. A wider class of prospective applications is the determination of the absolute phase of pulses emitted by lasers and atoms, molecules, and condensed matter at relatively low intensities.
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    Nanolocalized Nonlinear Electron Photoemission under Coherent Control
    (Nano Letters, 2005) Stockman, M.I.; Hewageegana, P.
    We theoretically show that two-photon coherent control yields electron photoemission from metal nanostructures that is localized in nanosize hot spots whose positions are controllable on a nanometer scale, in agreement with recent experiments. We propose to use silver V-shapes as tailored nanoantennas for which the position of the coherently controllable photoelectron emission hot spot can be deterministically predicted. We predict that the low-frequency, high-intensity (quasi-stationary) excitation of the photoemission leads to an exponentially high contrast of the coherent control.
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    Plasmonic enhancing nanoantennas for photodetection
    (Infrared Physics & Technology, 2007) Hewageegana, P.; Stockman, M.I.
    This paper discusses the use of plasmonic nanostructured systems as nanoantennas for photodetection. Even though semiconductors and their heterostructures have many useful properties and widely used in photodetection, their electron density is very small compared to that of metals and, therefore, they have low absorption cross sections. The idea of using metal nanostructured antennas is to combine the high optical responses of metals with the functional electric properties of semiconductors.