2007/12/11 by Guillaume Jourdan, Jourdan, Guillaume, Astrid Lambrecht +6
Decision Sciences · Physics and Astronomy · #FOS: Physical sciences #General Physics (physics.gen-ph) #Mechanical and Optical Resonators #Quantum Electrodynamics and Casimir Effect #Scientific Measurement and Uncertainty Evaluation #physics.gen-ph
paper · pdf · doi:10.48550/arxiv.0712.1767
arxiv created 2007/12/11 · openalex publication_date 2007/12/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We show that the Casimir force gradient can be quantitatively measured with no contact involved. Results of the Casimir force measurement with systematic uncertainty of 3% are presented for the distance range of 100-600 nm. The statistical uncertainty is shown to be due to the thermal fluctuations of the force probe. The corresponding signal to noise ratio equals unity at the distance of 600 nm. Direct contact between surfaces used in most previous studies to determine absolute distance separation is here precluded. Use of direct contact to identify the origin of distances is a severe limitation for studies of the Casimir forces on structured surfaces as it deteriorates irreversibly the studied surface and the probe. This force machine uses a dynamical method with an inserted gold sphere probe glued to a lever. The lever is mechanically excited at resonant frequency in front of a chosen sample. The absolute distance determination is achieved to be possible, without any direct probe/sample contact, using an electrostatic method associated to a real time correction of the mechanical drift. The positioning shift uncertainty is as low as 2 nm.