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Mid-wave infrared (IR) and long-wave IR spectral ranges are of growinginterest in various applications such as thermal imaging, thermography-basedremote sensing, and night vision. Materials widely used for IR photodetectorsin this regime include cadmium mercury telluride alloys and nanostructures ofcompound semiconductor. The materials development for IR optics will drive downthe cost of IR optical systems and enable larger scale deployment. Here, wereport a mid-wave IR responsive material composed of earth abundant andnon-toxic elements, Sr1+xTiS3. It has a highly anisotropicquasi-one-dimensional structure similar to hexagonal perovskites. We grewlarge, high quality single crystals and studied its anisotropic opticalproperties. We observed two distinct optical absorption edges at ~2.5 um and ~5um, respectively, for linear polarizations along two principal axes. Thematerial demonstrated strong and broadband linear dichroism spanning mid-waveIR and long-wave IR, with a dichroitic ratio of up to 22.

Mid-wave and Long-wave IR Linear Dichroism in a Hexagonal Perovskite Chalcogenide