The existence of resonant enhancement and near-field collimation of light waves by subwavelength apertures in metal films [for example, see T.W. Ebbesen et al., Nature (London) 391, 667 (1998) and H.J. Lezec et al., Science, 297, 820 (2002)] leads to the basic question: Can a light wave be enhanced and simultaneously localized in space and time by a subwavelength slit? To address this question, the spatial distribution of the electromagnetic field of an ultrashort (femtosecond) wave-packet scattered by a subwavelength (nanometer-size) slit was analyzed by using the conventional approach based on the Neerhoff and Mur solution of Maxwell's equations. The results show that a light wave can be resonantly enhanced by orders of magnitude and simultaneously localized in the near-field diffraction zone at the nm and fs scales. The chapter includes many illustrations to facilitate an understanding of the natural spatial and temporal broadening of light beams and the physical mechanisms that are contributing to the resonantly enhanced scattering and localization of fs pulses by subwavelength nm-size metal slits. The results are discussed in the context of possible applications in the near-field scanning optical microscopy (NSOM).
|Title of host publication||Lasers and Electro-Optics Research at the Cutting Edge|
|Publisher||Nova Science Publishers, Inc.|
|Number of pages||42|
|Publication status||Published - Dec 1 2007|
ASJC Scopus subject areas
- Physics and Astronomy(all)