Frequently asked questions about&around nano-optics.
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| The surface curvature at the apex of a scanning microscope tip amplifies the electric field of properly polarized incident light. Several theoretical methods are available to perform calculations of this effect to optimize the achievable enhancement. |
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For nano-optical investigations, one can use the approach of highly localized excitations. |
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The critical task for any nano-optical work is the collection of light sent out from a volume of matter only a few nm in radius. Among the techniques that have been proposed to date, the two most promising techniques for ultimate lateral resolution at surfaces use optical nearfields: aperture techniques and techniques based upon localized field enhancement.
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| As a loose definition, we call a nearfield any electromagnetic field that is closer than its corresponding wavelength to the source that generated it. Only in the 1980ies scientific interest has turned to optical nearfields. Historically, optical electromagnetic phenomena have been studied exclusively at distances far away from their sources. These farfields are in many respects easier to understand and handle than those fields that exist very close to their material sources. |
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