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Toward Atomic-Scale Control over Structural Modulations in Quasi-1D Chalcogenides for Colossal Optical Anisotropy.

Guodong Ren1, Shantanu Singh2,3, Gwan Yeong Jung4

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|October 20, 2025
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Summary
This summary is machine-generated.

Researchers enhanced colossal optical anisotropy in SrxTiS3 materials to Δn = 2.5 by controlling atomic-scale structural modulations. This discovery offers new pathways for tailoring light polarization using tunable material properties.

Keywords:
charge orderingelectron microscopyoptical anisotropyquasi-1D chalcogeniderefractive indexstructural modulations

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Optoelectronics

Background:

  • Optically anisotropic materials are crucial for manipulating light polarization.
  • Colossal optical anisotropy (Δn = 2.1) was previously observed in Sr9/8TiS3 due to structural modulations and charge ordering.
  • Excess strontium in Sr9/8TiS3 induces periodic structural modulations and extra electrons, leading to charge ordering and high polarizability along the c-axis.

Purpose of the Study:

  • To further enhance colossal optical anisotropy in SrxTiS3 compounds.
  • To investigate the role of structural modulation periodicity in tuning optical properties.
  • To achieve a theoretical and experimental birefringence (Δn) of 2.5 in Sr8/7TiS3.

Main Methods:

  • Density-functional-theory (DFT) calculations were employed to study SrxTiS3 compounds (x = [1, 9/8, 8/7, 6/5, 5/4, 4/3, 3/2]).
  • Single crystals of Sr8/7TiS3 were synthesized using a molten-salt flux method.
  • Structural characterization included single-crystal X-ray diffraction and scanning transmission electron microscopy (STEM).
  • Optical properties were measured using polarization-resolved Fourier-transform infrared (FTIR) spectroscopy.

Main Results:

  • A maximum birefringence of Δn = 2.5 was theoretically predicted for Sr8/7TiS3.
  • Structural modulations, arising from TiS6 octahedra stacking and prism distortions, are thermodynamically stable for 1 < x < 1.5.
  • An indirect-to-direct band gap transition and increased Ti-dz2 state occupancy were predicted for x ≥ 8/7, correlating with enhanced anisotropy.
  • Experimental measurements on Sr8/7TiS3 confirmed Δn ≈ 2.5, matching theoretical predictions.
  • Single-crystal XRD and STEM confirmed the long-range order and periodicity of Sr8/7TiS3.

Conclusions:

  • Compositional control over atomic-scale modulations in SrxTiS3 effectively tunes colossal optical anisotropy.
  • The study demonstrates a maximum birefringence of Δn = 2.5 in Sr8/7TiS3, achieved through optimized structural modulation periodicity.
  • The findings suggest that similar strategies can be applied to other modulated structures for optical property engineering.