Design, fabrication, and characterization of a one-dimensional polarizing photonic crystal

Ehsan Ordouie; Hossein Alisafaee; Azad Siahmakoun

doi:10.1117/12.2320303

7 September 2018 Design, fabrication, and characterization of a one-dimensional polarizing photonic crystal

Ehsan Ordouie, Hossein Alisafaee, Azad Siahmakoun

Proceedings Volume 10731, Nanostructured Thin Films XI; 107310I (2018) https://doi.org/10.1117/12.2320303
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

A one-dimensional, single-material polarizing photonic bandgap structure is designed and fabricated using e-beam PVD and oblique angle deposition technique. In order to obtain high- and low-index layers, we deposited alternate layers of titanium dioxide (TiO₂) at deposition angles of 0° and 70°on top of a fused silica substrate. This approach is chosen since at deposition angle of zero degree, deposited TiO₂ using e-beam PVD, show a negligible birefringence while the obliquely deposited TiO₂acts as a biaxial material with significant birefringent behavior. As a result, deposition of a bilayer film at two angles is analogous to using two different materials with the advantage of simplifying fabrication and modeling this polarizing device. The bandgap of the bilayer structure is modeled in a way that only a specific wavelength with certain polarization, p polarization, could pass through while the s polarization is reflected. For modeling we used Transfer Matrix Method and numerical FDTD analysis to simulate behavior of the 1D photonic band gap structure. The simulations produce better than 98% reflection for s polarization and almost no reflection for p polarization for the center wavelength of 632.8 nm. The fabricated device shows 94% reflection for s polarization and less than 6% reflection for p polarization at the red HeNe laser wavelength at an incident angle of 70°. The results demonstrate that a 1D multi-layer photonic crystal, fabricated from a single material, can be designed to selectively reflect or transmit p or s polarization of an incident light beam.

Conference Presentation

Citation Download Citation

Ehsan Ordouie, Hossein Alisafaee, and Azad Siahmakoun "Design, fabrication, and characterization of a one-dimensional polarizing photonic crystal", Proc. SPIE 10731, Nanostructured Thin Films XI, 107310I (7 September 2018); https://doi.org/10.1117/12.2320303

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