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Optical characterization of BaTiS3 with giant infrared birefringence (Conference Presentation)
Author(s): Jad Salman; Graham Joe; Shanyuan Niu; Huan Zhao; Yucheng Zhou; Thomas Orvis; Huaixun Huyan; Jiangbin Wu; Yang Liu; Thomas E. Tiwald; Han Wang; Jayakanth Ravichandran; Mikhail A. Kats

Paper Abstract

Birefringence is a fundamental property of materials that enables optical components such as wave plates and polarizers, and is quantified by the difference between extraordinary and ordinary refractive indices. Solid homogeneous crystals like calcite and rutile are some of the most birefringent materials at visible and near-infrared wavelengths. However, at longer wavelengths (i.e., mid to far infrared) these materials become highly lossy. In the mid infrared, the most birefringent materials that are transparent are significantly less birefringent than their visible counterparts. While structured materials with strong optical anisotropy exist at these wavelengths (i.e., with form birefringence), their utility is limited by fabrication constraints. In the talk, we will report on a rationally designed and synthesized material, barium titanium sulfide (BaTiS3), which has broadband and giant birefringence surpassing that of any known transparent anisotropic crystal throughout the infrared. We will detail our extensive optical characterization to extract the anisotropic complex refractive index spanning the ultraviolet to the mid infrared by combining generalized spectroscopic ellipsometery and polarized reflection and transmission measurements. We report a difference between the ordinary and extraordinary refractive index of up to 0.76 in a mid-infrared region of transparency, more than twice that of rutile in the visible, and show that the unprecedented optical anisotropy extends to the limit of our detection capabilities (16.7 μm). This material also features highly anisotropic Raman scattering, and we are currently working on measuring polarized infrared photoluminescence measurements to provide further insight into the anisotropy of this unique material.

Paper Details

Date Published: 8 March 2019
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Proc. SPIE 10927, Photonic and Phononic Properties of Engineered Nanostructures IX, 109271I (8 March 2019); doi: 10.1117/12.2510946
Show Author Affiliations
Jad Salman, Univ. of Wisconsin-Madison (United States)
Graham Joe, Univ. of Wisconsin-Madison (United States)
Shanyuan Niu, The Univ. of Southern California (United States)
Huan Zhao, The Univ. of Southern California (United States)
Yucheng Zhou, The Univ. of Southern California (United States)
Thomas Orvis, The Univ. of Southern California (United States)
Huaixun Huyan, The Univ. of Southern California (United States)
Jiangbin Wu, The Univ. of Southern California (United States)
Yang Liu, The Univ. of Southern California (United States)
Thomas E. Tiwald, J. A. Woollam Co., Inc. (United States)
Han Wang, The Univ. of Southern California (United States)
Jayakanth Ravichandran, The Univ. of Southern California (United States)
Mikhail A. Kats, Univ. of Wisconsin-Madison (United States)


Published in SPIE Proceedings Vol. 10927:
Photonic and Phononic Properties of Engineered Nanostructures IX
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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