Abstract
In this work, three-dimensional near-field imaging of the focused laser spot was studied theoretically and experimentally. In the theoretical simulation, we use the electromagnetic equivalent of the vectorial Kirchhoff diffraction integral to calculate the intensity distribution of the focal region, and a high depolarization is found in high numerical aperture systems (NA = 0.85). The experimental set-up is based on a near-field scanning optical microscope (NSOM) system. A high-NA objective lens is used to focus incident light of various polarizations, and a tapered near-field optical fibre probe of the NSOM system is used to determine the intensity of the focal field. The results show an asymmetric distribution of the focused intensity with the linear polarized laser beam.
| Original language | English |
|---|---|
| Pages (from-to) | 225-228 |
| Journal | Journal of Microscopy |
| Volume | 210 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1 Jun 2003 |
| Externally published | Yes |
Bibliographical note
Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].Research Keywords
- Apodization
- Focal point
- Near-field scanning optical microscopy
- Polarization
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