Design and development of setup for measurements of optical constants at low temperature

Abstract

In this work, we report the fabrication of an experimental setup for low temperature optical properties measurement. Our design is appropriate for the characterization of thin films samples with different geometries like square shape, circular shape etc. UV Visible spectroscopy technique was used to measure the optical properties. Simple design and a small sample holder are developed with limited components. The sample holder is placed in vacuum chamber with all accessories related to the setup to fulfil its all requirement. The setup is fabricated using the materials which are easily available in market so that any part can be replaced in case of damage. The working and preciseness of presently developed setup has been validated by recording the data for a standard SrTiO3 single crystal substrate. The obtained data was found to be closely consistent with the data reported in the literature. Some important physical quantities /parameters (like transmission, band gap, disorderness), for SrTiO3, have also been studied (87K to 300K) through presently fabricated setup.