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Sub-femto-Newton sensing torsion pendulum for detection of light force

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Abstract

Mechanical oscillators are widely used in many fields of physics, including ultrahigh precision measurements, gravity experiments, and optical mechanical systems. A sub-gram-scale silicon wafer is suspended by a tungsten wire with a diameter of 8 µm, forming a torsion pendulum to detect the laser radiation pressure. We demonstrate the application of a low-frequency, highly sensitive torsion pendulum for the measurement of light forces. In the feedback cooling state, the system exhibits a force sensitivity at the end of the pendulum close to 0.1 fN, approaches the thermal noise limit, and reaches the detection level of the laser radiation pressure of 60 nW.

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Supplementary Material (1)

NameDescription
Supplement 1       The picture of the experimental device and the key parameters of it

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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