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.
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Mikhail N. Libenson, Mikhail N. Libenson, George A. Martsinovsky, 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); doi: 10.1117/12.326813; https://doi.org/10.1117/12.326813

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