DOI: 10.1063/1.368001. Noise in optical measurements of cantilever deflections

Noise in optical measurements of cantilever deflections

10.1063/1.368001

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

The optical beam deflection method using the knife edge detection technique is one of the simplest optical sensing methods. We investigate theoretically the limit to the resolution when sensing the displacements of a mechanical cantilever using the knife edge detection technique implemented with a quasimonochromatic thermal-like optical source. Simple formulas for the minimum detectable displacement of the cantilever’s front end are derived assuming all nonoptical noises negligible. It is shown that superluminiscent diodes can yield a minimum detectable displacement of the cantilever about 5 dBs above the shot noise for 1 mW of optical power. It is also shown that in many cases of practical interest the source induced noise is smaller than the thermal-vibration noise of the cantilever. Thus, in many cases, using an inexpensive thermal-like source with the knife edge detection technique can be as effective as using a high-coherence shot-noise limited source.

Bibliography

GarcÄ±Ìa-Valenzuela, A., & Villatoro, J. (1998). Noise in optical measurements of cantilever deflections. Journal of Applied Physics, 84(1), 58â63.

Authors 2

Augusto Garcı́a-Valenzuela (first)
Joel Villatoro (additional)

References 18 Referenced 21

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{'key': '2024021017405477200_r3'}
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{'key': '2024021017405477200_r9'}
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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 9:53 a.m.)
Deposited	1 year, 6 months ago (Feb. 10, 2024, 1:14 p.m.)
Indexed	1 year, 2 months ago (June 4, 2024, 9:17 a.m.)
Issued	27 years, 1 month ago (July 1, 1998)
Published	27 years, 1 month ago (July 1, 1998)
Published Print	27 years, 1 month ago (July 1, 1998)

Funders 0

None

BibTeX

@article{Garc_a_Valenzuela_1998, title={Noise in optical measurements of cantilever deflections}, volume={84}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.368001}, DOI={10.1063/1.368001}, number={1}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Garcı́a-Valenzuela, Augusto and Villatoro, Joel}, year={1998}, month=jul, pages={58–63} }

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