Utilization of Different Laser Systems to Determine the Optical Properties of Chloroform and Rhodamine 6G Thin – Films in Nanometer Scale

Abstract

In this work thin films were produced from (Chloroform and Rhodamine 6G) deposited on glass substrate that has a thickness (1mm) and refractive index (1.3) in a vacuum chamber firstly; without heating (at room temperature) and secondly; with heating (at different temperatures). These films can be used as optical components (filters, reflectors, attenuators, mirrors ... etc). The optical properties for each thin film were determined. The thickness of the thin film was measured by interference phenomena during the deposition process for He-Ne laser with a power (1 mW). Incident and transmitted intensity was measured for the prepared films at different laser wavelengths extended from mid visible (532nm) to near infrared region (1064nm). These intensities were used to calculate the transmission percentage and the reflectance as a function of wavelengths. Also the refractive index and the absorption coefficient for ‫‪each sample were deduced. All these measured and calculated values‬‬ ‫.‪obtained at vertical incidence of laser on the thin film‬‬ ‫‪The results that were obtained from prepared films without heating‬‬ ‫‪gave a good indicator to use these materials as filters at some‬‬ ‫‪wavelengths, but the films tend to be inhomogeneous and this gave a‬‬ ‫‪variation in the results if the measurement were done at different points of‬‬ ‫.‪the layer of the film‬‬ ‫‪At different temperatures the prepared films tended to be‬‬ ‫‪homogenous and the layer of each film gave a good indicator to use these‬‬ ‫.‪materials as mirrors or optical filters at some wavelengths‬‬ ‫‪Also the results showed that, the optical properties of thin films are‬‬ ‫‪not dependent on the thickness, but mainly on the temperature of the‬‬ ‫.‪substrate‬‬