Removal of high-voltage-induced surface charges by ultraviolet light
arXiv:2503.19662 · doi:10.1063/5.0269038
Abstract
A plethora of studies ranging from precision physics to quantum information employ ions, highly excited neutral atoms or polar molecules as tools. Motivated by the need for miniaturization, scalability and controllability, the particles are often trapped close to electrodes imprinted on dielectric surfaces. However, such geometry makes the particles susceptible to undesired surface charges. To understand how high voltage applied to the electrodes mediates the buildup of charges, we use a scanning Kelvin probe in an ultrahigh vacuum to investigate the electric potential landscape of an electrostatic molecule trap with a microstructured electrode array. We find that the surface becomes positively charged after applying voltages to the electrodes, leading to offset and patch electric potentials across the surface. Removal of these charges is demonstrated using ultraviolet light. The dynamics of this process, including the dependence on light intensity, wavelength and sample type, are investigated in detail. We find the charge removal to be faster for shorter ultraviolet wavelengths, with an additional polymer coating providing further enhancement. Our findings may be useful in a wide spectrum of experiments with electric-field-sensitive particles.
The following article has been submitted to Review of Scientific Instruments
References in corpus (16)
- Trapped-Ion Quantum Computing: Progress and Challenges
- Many-Body Physics with Individually-Controlled Rydberg Atoms
- Heating of trapped ions from the quantum ground state
- Reduction of anomalous heating in an in-situ-cleaned ion trap
- Optoelectrical cooling of polar molecules to sub-millikelvin temperatures
- Fifteen Years of Cold Matter on the Atom Chip: Promise, Realizations, and Prospects
- Spatially Resolved Excitation of Rydberg Atoms and Surface Effects on an Atom Chip
- Fabrication and heating rate study of microscopic surface electrode ion traps
- Engineering of Microfabricated Ion Traps and Integration of Advanced On-Chip Features
- Measuring Electric Fields From Surface Contaminants with Neutral Atoms
- Microfabricated Ion Traps
- Electron impact ionization loading of a surface electrode ion trap
- Reduction of heating rate in a microfabricated ion trap by pulsed-laser cleaning
- Storage and Adiabatic Cooling of Polar Molecules in a Microstructured Trap
- Coherent manipulation of cold Rydberg atoms near the surface of an atom chip
- Electric-field-controlled cold dipolar collisions between trapped CHF molecules