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Phase change materials provide an ideal platform in designing optical switches and tunable optical components. This is due to the large reversible refractive index changes induced in phase change materials. In this work, we design and develop a tunable optical thin film filter for visible and infrared (IR) regions using optical phase change materials. In our prior work, we examined Ge2Sb2Te5 (GST) phase change material, which undergoes an amorphous to crystalline phase change. Ge2Sb2Se4Te1(GSST) is a newer phase change material that undergoes a similar phase transition around ~300 C, and it is more suitable for operation in the IR region. It has low optical loss compared to Ge2Sb2Te5 (GST) in both crystalline and amorphous states. Therefore, for many applications, GSST can be used over GST to achieve better performance. Based on the studies we have conducted so far, it was evident that using GSST, designing a tunable filter that equally performs in both crystalline and amorphous states, could be challenging. Therefore, other phase change materials (GeSe, GeTe, Ge3Te7 and Sb2Te3) need to be studied for application in tunable filter design. Findings of the detailed analysis of above-mentioned phase change materials for achieving the proposed objective will be discussed. This information will greatly contribute in expanding the scope of our research since there are numerous applications for these optically active materials.
Andrew M. Sarangan
Primary Advisor's Department
Electro-Optics and Photonics
Stander Symposium project, School of Engineering
"Multi Structural Tunable Filters Using Optical Phase Change Material (O-PCM) for the Visible and IR Region" (2020). Stander Symposium Projects. 2028.