IQST Grad School Project

Shot noise limited optogalvanic vapor cell

Project description:

The goal of this project is to integrate a shotnoise limited ion current detection into an optogalvanic vapor cell. Such a cell can be used as a sensitive detector for electric and magnetic fields as well as highly excited atoms and molecules. Due to the narrow excitation linewidth for Rydberg states, this sensor is highly selective for different isotopes for atom detection or species in case of molecules. Thin film technology allows to integrate the required circuit in micron sized pixels. This project combines high resolution spectroscopy with the engineering of integrated highly sensitive current amplification in a chemically challenging environment. We plan to excite Alkali Rydberg atoms in an electrically contacted vapor cell. These atoms are ionized due to collisions with the background gas. A voltage directs these charges towards the electrodes on the inside of the cell, where they will be detected with an amplifier based on thin film technology. Requirements for these amplifiers are among others, that it is low noise, provides a stable amplification under changing environmental conditions and is chemically inert against the content of the cell. Fulfilling all these requirements is a challenging task for engineering. The development of transparent, chemically resistant electrodes would broaden the field of applications and would in combination with anodic bonding allow for small sensors, even down to microscopic cells.

Selection of Recent Publications:

Fabrication and characterization of an electrically contacted vapor cell, R. Daschner, R. Ritter, H. Kübler, N. Frühauf, E. Kurz, R. Löw, T. Pfau, Opt. Lett. 37, 2271 (2012); arXiv:1204.2391; doi: 10.1364/OL.37.002271

Electrical read out for coherent phenomena involving Rydberg atoms in thermal vapor cells, D. Barredo, H. Kübler, R. Daschner, R. Löw, T. Pfau Phys. Rev. Lett. 110, 123002 (2013); arXiv:1209.6550; doi: 10.1103/PhysRevLett.110.123002

Triple stack glass-to-glass anodic bonding for optogalvanic spectroscopy cells with electrical feedthroughs, R. Daschner, H. Kübler, R. Löw, H. Baur, N. Frühauf, T. Pfau Appl. Phys. Lett. 105, 041107; arXiv:1403.1093; doi: 10.1063/1.4891534