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3 October 2024 Giant optical anisotropy
Mikhail A. Kats
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Proceedings Volume PC13110, Active Photonic Platforms (APP) 2024; PC131101C (2024) https://doi.org/10.1117/12.3025543
Event: Nanoscience + Engineering, 2024, San Diego, California, United States
Abstract
I will describe our recent demonstration of perovskite chalcogenides with optical anisotropy far larger than any other known materials. These materials include barium titanium sulfide (BaTiS_3) and strontium titanium sulfide (Sr_9/8TiS_3). Sr_9/8TiS_3 is transparent in the mid- to far-infrared, and is positive uniaxial, with extraordinary refractive index n_e = 4.5 and ordinary index n_o = 2.4. BaTiS_3 has similar optical properties and a smaller, but still giant, birefringence, with n_e ~ 3.3 and ordinary index n_o ~ 2.6. In BaTiS_3, atomic displacements on the order of 0.1 Angstrom (“correlated disorder”) lead to a slight increase in ne and a significant reduction in no compared to what first-principles calculations predict in the absence of these displacements. In Sr_9/8TiS_3, the stable material is Sr rich compared to “stoichiometric” SrTiS_3, resulting in structural modulations and enhance the electronic polarizability along the optical axis, dramatically increasing n_e. We will discuss the implication of these new highly anisotropic materials, including potential applications and how they might be integrated into optical systems.
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Mikhail A. Kats "Giant optical anisotropy", Proc. SPIE PC13110, Active Photonic Platforms (APP) 2024, PC131101C (3 October 2024); https://doi.org/10.1117/12.3025543
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KEYWORDS
Anisotropy
Birefringence
Refractive index
Strontium
Titanium
Physics
Polaritons
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