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<p>We theoretically propose a simple, cost-effective and efficient method for tailoring and controlling the polarisation state of light using a glass plate operating near Brewster’s angle. By systematically varying the angle of incidence of unpolarised light, the reflected and transmitted components exhibit controllable degrees of polarisation, allowing for smooth modulation of the polarisation state. The method offers flexibility in both reflection and transmission modes—reflection providing a higher degree of polarisation, while transmission ensures better intensity throughput. For broadband (polychromatic) light, the approach enables wavelength-dependent polarisation control, effectively functioning as a tunable polarisation filter. This technique provides a compact and easily implementable alternative to conventional polarisers and can be promising for applications in optical instrumentation, imaging, quantum optics experiments, and polarization-based communication systems.</p>

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Tailoring and filtering the light polarisation based on Brewster’s law

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Gyaprasad,
  • Dinesh Kumar

摘要

We theoretically propose a simple, cost-effective and efficient method for tailoring and controlling the polarisation state of light using a glass plate operating near Brewster’s angle. By systematically varying the angle of incidence of unpolarised light, the reflected and transmitted components exhibit controllable degrees of polarisation, allowing for smooth modulation of the polarisation state. The method offers flexibility in both reflection and transmission modes—reflection providing a higher degree of polarisation, while transmission ensures better intensity throughput. For broadband (polychromatic) light, the approach enables wavelength-dependent polarisation control, effectively functioning as a tunable polarisation filter. This technique provides a compact and easily implementable alternative to conventional polarisers and can be promising for applications in optical instrumentation, imaging, quantum optics experiments, and polarization-based communication systems.