Near-field imaging of optical phase and its singularities

Abstract:

It is generally accepted that by incorporating a scanning near-field optical microscope into one arm of an interferometer it is possible to map both the phase and the amplitude of an optical near field. We show that a straightforward image interpretation is possible only for a field having a narrow polarization range and spatial frequency spectrum, a circumstance that makes the images prone to result in wrong interpretations, especially those pertaining to optical phase singularities. Pbkp_redicaments when treating phase images are discussed and illustrated by considering the interferometric near-field imaging of co-propagating waveguide modes. A simple method is suggested that enable one to control the extent of distortion of phase information in the imaging process.

Año de publicación:

2002

Keywords:

Fuente:

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