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research article

Measuring Optical Phase Singularities at Subwavelength Resolution

Märki, Iwan  
•
Dändliker, R.  
•
Salt, Martin
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2004
Journal of Optics A. Pure and Applied Optics

We will present experimental and theoretical studies of optical fields with subwavelength structures, in particular phase singularities and coherent detection methods with nanometric resolution. An electromagnetic field is characterized by an amplitude, a phase and a polarization state. Therefore, experimental studies require coherent detection methods, which allow one to measure the amplitude and phase of the optical field with subwavelength resolution. We will present two instruments, a heterodyne scanning probe microscope (heterodyne SNOM) and a high resolution interference microscope (HRIM). We will review some earlier work using the heterodyne SNOM, in particular the measurement of phase singularities produced by a 1 μm pitch grating with 10 nm spatial sampling. Using the HRIM we have investigated the intensity and phase distributions (with singularities) in the focal region of microlenses. The measurements are compared with the results calculated by rigorous diffraction theory.

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Type
research article
DOI
10.1088/1464-4258/6/5/009
Author(s)
Märki, Iwan  
Dändliker, R.  
Salt, Martin
Nesci, Antonello
Date Issued

2004

Published in
Journal of Optics A. Pure and Applied Optics
Volume

6

Start page

189

End page

196

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

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Available on Infoscience
January 6, 2009
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/33101
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