2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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Clean Technology 2008

Polarization devices based on nanoengineered chalcogenide thin films

R.J. Martín-Palma, F. Zhang, J. Xu, A. Lakhtakia, C.G. Pantano
The Pennsylvania State University, US

serial bideposition, chalcogenide, sculptured thin film, polarization

During the past few years, interest has grown in the serial bideposition technique to fabricate columnar thin films (CTFs) and sculptured thin films (STFs) that possess engineered nanoscale morphology. Among other materials, chalcogenide-glass CTFs and STFs have been grown by using this technique. These glasses are of great technological importance, since their transmission in the infrared (IR) region of the spectrum make them very suitable for active and passive IR devices. Moreover, extra functionality for optical fabrication and performance are provided by the possibility of modifying their optical band gap and index of refraction by illumination. We report the design and fabrication of chalcogenide-glass CTFs and STFs for application as polarization converters, circular polarization-selective mirrors, filters, and resonators. This work is expected to lead to novel sensor and detector architectures. In the present work, non-linear optical effects on nanostructured chalcogenide sculptured thin films were studied. It was found that the combination of an intrinsically isotropic material with a deposition technique able to induce non-homogeneous growth results in anisotropic optical behavior. Additionally, advanced thin film processing, namely the serial bi-deposition technique, has been demonstrated as capable of maximizing non-linear effects, leading to sculptured thin films of large birefringence.

Nanotech 2008 Conference Program Abstract