Infrared imaging of samples in ultra high pressure diamond anvil cells

TL;DR

This paper presents an infrared imaging system for micrometer-sized samples in diamond anvil cells, enabling better identification of hydride superconductors through stable and precise temperature-dependent reflectivity measurements.

Contribution

The authors develop a novel infrared imaging platform with high spatial and intensity stability for samples under ultra high pressure in diamond anvil cells.

Findings

Intensity stability within 1% from 100 K to 300 K

Spatial stability of a few micrometers

Effective identification of hydride superconductors

Abstract

We describe an experimental platform that generates infrared images of micrometer-sized samples in the high pressure region of a diamond anvil cell. Using a 2.3 micron laser as a source of radiation, the system will be particularly useful in identifying hydride superconductors which exhibit an anomalous temperature dependence of reflectivity in the 2.3 micron region. Our system shows an intensity stability within one percent when the sample temperature is swept from 100 K to 300 K. The spatial stability is of the order of a few micrometers in the same temperature range.