2014/09/17 by Joseph L. Garrett, David A. T. Somers, David Somers +1
Chemistry · Physics and Astronomy · #Acoustics #Advanced Thermodynamics and Statistical Mechanics #Amplitude #Atomic force microscopy #Atomic physics #Casimir effect #Chemistry #Classical mechanics #Electrostatic force microscope #Heterodyne (poetry) #Kelvin probe force microscope #Materials science #Mechanical and Optical Resonators #Microscopy #Molecular physics #Nanotechnology #Non-contact atomic force microscopy #Optics #Physics #Quantum Electrodynamics and Casimir Effect #Volta potential #cond-mat.other #quant-ph
paper · pdf · doi:10.1088/0953-8984/27/21/214012
published as J. Phys.: Condens. Matter 27 (2015) 214012
arxiv created 2014/09/17 · openalex publication_date 2015/05/12 · arxiv updated 2015/05/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Measurements of the Casimir force require the elimination of the electrostatic force between the surfaces. However, due to electrostatic patch potentials, the voltage required to minimize the total force may not be sufficient to completely nullify the electrostatic interaction. Thus, these surface potential variations cause an additional force, which can obscure the Casimir force signal. In this paper, we inspect the spatially varying surface potential of e-beamed, sputtered, sputtered and annealed, and template stripped gold surfaces with Heterodyne amplitude modulated Kelvin probe force microscopy (HAM-KPFM). It is demonstrated that HAM-KPFM improves the spatial resolution of surface potential measurements compared to amplitude modulated Kelvin probe force microscopy. We find that patch potentials vary depending on sample preparation, and that the calculated pressure can be similar to the pressure difference between Casimir force calculations employing the plasma and Drude models.