| Autor: |
M. Streibl, Achim Wixforth, C. Kadow, Florian W. Beil, A. C. Gossard |
| Rok vydání: |
1999 |
| Předmět: |
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| Zdroj: |
1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027). |
| DOI: |
10.1109/ultsym.1999.849346 |
| Popis: |
The interaction of surface acoustic waves and free carriers in a nearby semiconducting sheet yields an extremely sensitive method for sensing electrical and optical signals. In the present work we demonstrate the spatially resolved detection of optical signals with a spatial resolution of a few acoustic wavelengths. We exploit the high selectivity of so-called tapered transducers to excite adjustable narrow acoustic beams allowing for the scanning of photogenerated charge distributions. Using a special layout, both x and y-coordinate of the optical signal are readily read out in a single frequency sweep. Complex 2D image information can be gathered when a tomographic imaging technique is applied. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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