Magnetic and Desorption Cryogenic Calorimeters as Supersensitive Detectors of Far IR Radiation

Abstract

In this work, we estimate the potential of a cryogenic far IR radiation detector for registering the energy release by the amount of a substance desorbed upon its exposure to far IR quanta. The temperature invariability of the system at the first-order phase transition excludes the diffusion character of heat transfer processes, which contributes to the detector’s speed of operation and, according to our estimates, enables its use in pulsed location systems based on a CO₂ TEA laser. As an example of another cryogenic detector, we consider an antiferromagnetic, where the speed of operation is provided by the resonance transfer of far IR quantum energy to the spin system, the sublevels of which are split by a strong (∼1,000 T) exchange field. The magnetic response arising in this case is registered by a quantum magnetometer based on the Josephson effect.