Abstract
Imaging the local evanescent intensity gradients by using a tapping-mode near-field scanning optical microscope is developed. Two different optical structures, one a well-characterized BK-7 glass prism in the total internal reflection configuration, and the other a side-polished optical fiber waveguide with a step index of refraction, were studied. Results show distinct imaging contrasts of the intensity gradients, and reveal the variations of the local index of refraction of waveguide. This is a novel near-field optical method, and can be used in the imaging of local index of refraction of a variety of optical waveguide structures.
| Original language | English |
|---|---|
| Pages (from-to) | 313-318 |
| Number of pages | 6 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 3896 |
| Publication status | Published - 30 Nov 1999 |
| Externally published | Yes |
| Event | Proceedings of the 1999 Design, Fabrication, and Characterization of Photonic Devices - Singapore, Singapore Duration: 30 Nov 1999 → 3 Dec 1999 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering