Visualization of radio-frequency waves via double resonance spectroscopy of cesium atoms

摘要

A novel technique to visualize RF waves in the gigahertz frequency range based on the double resonance spectroscopy of cesium-133 atoms is developed. This technique allows one to obtain fluorescence at a near-infrared wavelength of 852 nm, which can be detected by a charge-coupled device camera. The fluorescence depends on the strength distribution of 9.2 GHz RF waves. This method realizes real-time, high-resolution imaging using RF waves. In this study, the visualization of RF waves on a microstrip line is demonstrated and RF standing waves are clearly observed. The sensitivity of the visualization to the input power and phase shift of the RF standing waves arising from a particular condition of the reflection waves are investigated. (C) 2019 The Japan Society of Applied Physics