at Google ScholarTitle data
Lippitz, Markus ; Schüttler, Martin ; Giessen, Harald ; Born, M. ; Rühle, Wolfgang W.:
Bandwidth enhancement of a shear-force-controlled distance regulation in near-field microscopy.
In: Journal of Applied Physics.
Vol. 86
(1999)
Issue 1
.
- pp. 100-106.
ISSN 1089-7550
DOI: https://doi.org/10.1063/1.370705
Abstract in another language
The distance between sample and probe in a scanning near-field optical microscope is regulated via tracing the shear-force on the tip which is glued to a tuning fork piezo. A lock-in technique is used. We demonstrate that the bandwidth of the control loop is increased if not only amplitude or phase, but a favorable combination of both is used as feedback signal. The enhancement of bandwidth is connected with a reduction of signal-to-noise ratio. The optimum combination of both, bandwidth and signal-to-noise ratio, can be adjusted purely electronically to the specific needs of an experiment. A theoretical model is developed that discloses the relation between the mechanical and electrical properties of the combination of tuning fork and fiber tip. The frequency response of the shear-force detection system is calculated with a numerical simulation based on this model. Experimental frequency response curves are well fitted by these simulations. Our results are especially important for low-temperature scanning microscopy, where the bandwidth enhancement is essential for obtaining a reasonable scanning speed. (C) 1999 American Institute of Physics. S0021-8979(99)04713-1.
Further data
| Item Type: | Article in a journal |
|---|---|
| Refereed: | Yes |
| Institutions of the University: | Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics III - Nanooptics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics III - Nanooptics > Chair Experimental Physics III - Nanooptics - Univ.-Prof. Dr. Markus Lippitz |
| Result of work at the UBT: | No |
| DDC Subjects: | 500 Science 500 Science > 500 Natural sciences 500 Science > 530 Physics |
| Date Deposited: | 17 Dec 2015 09:06 |
| Last Modified: | 25 Jan 2022 13:47 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/28977 |