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Controlling material birefringence in sapphire via self-assembled, sub-wavelength defects

Authors
  • SINGH, A
  • SHARMA, G
  • RANJAN, N
  • MITTHOLIYA, K
  • BHATNAGAR, A
  • SINGH, BP
  • MATHUR, D
  • VASA, P
Publication Date
Dec 03, 2018
Source
DSpace at IIT Bombay
Keywords
License
Unknown
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Abstract

Birefringence is the optical property of a material having a refractive index that depends on the polarization and propagation direction of light. Generally, this is an intrinsic optical property of a material and cannot be altered. Here, we report a novel technique-direct laser writing-that enables us to control the natural, material birefringence of sapphire over a broad range of wavelengths. The broadband form birefringence originating from self-assembled, periodic array of sub-wavelength (similar to 50-200 nm) defects created by laser writing, can enhance, suppress or maintain the material birefringence of sapphire without affecting its transparency range in visible or its surface quality.

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