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13 October 1998 Physics of laser action on surface and probe in intensive near field
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From the moment of its creation scanning near-field optical microscope (SNOM) has been attracting significant attention in the way of its application to superlocal optical action on objects. In fact, near-field radiator is a unique light source with dimensions smaller than the radiation wavelength. Using of such source in micro- and nanoelectronics, biology and other fields of science and technology extends potentialities of existing technologies. However, there are some principle physical and technical limitations of effective localization oflight action. Near-field radiator has to provide high power of the output radiation and its action has to be localized within as small region as possible. The highest transmission, that near-field probes have at the present time, is about iO — lOs. This means that with 10 mW input power coupled into the fiber probe and 50nm output aperture light power density at probe exit is about 41O- 4 lO W/cm2. Further increasing ofthe input power results in heating and destruction of the probe. This effect restricts efficiency of near-field action on surface. Localization of the near-field action on surface has, in turn, principle limitation related to the relaxation mechanism of absorbed light energy. Below these physical mechanisms that limit efficiency of near-field action are considered in details and possible ways of the efficiency increasing are discussed.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mikhail N. Libenson and George A. Martsinovsky "Physics of laser action on surface and probe in intensive near field", Proc. SPIE 3467, Far- and Near-Field Optics: Physics and Information Processing, (13 October 1998);

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