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<p>In this paper, a new method is proposed to achieve wide-angle and efficient coupling of light into a thin film, holographic optical element (HOE). The coupling is based on diffraction of light (the probe beam) by a holographic element. Analytically, we find, when the probe beam follows a specific angular orbit, Bragg conditions for diffraction can be satisfied and the maximum diffraction efficiency expected. As an experimental test of the proposed idea, such a HOE device has been successfully realized. Our result indicates that a highly efficient diffraction (&gt; 80%) can be achieved for a broad range of light incident angle when the angle is along the designed angular orbit. This finding would open up a new possibility for concentrated solar panel application that is both efficient, low cost, and for a broad incident angle of sunlight.</p>

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An efficient and wide angle coupling of light to a thin film holographic optical element

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月2日

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  • Mei-Li Hsieh,
  • Zih Fan Chen,
  • Shiuan-Huei Lin,
  • Shawn-Yu Lin

摘要

In this paper, a new method is proposed to achieve wide-angle and efficient coupling of light into a thin film, holographic optical element (HOE). The coupling is based on diffraction of light (the probe beam) by a holographic element. Analytically, we find, when the probe beam follows a specific angular orbit, Bragg conditions for diffraction can be satisfied and the maximum diffraction efficiency expected. As an experimental test of the proposed idea, such a HOE device has been successfully realized. Our result indicates that a highly efficient diffraction (> 80%) can be achieved for a broad range of light incident angle when the angle is along the designed angular orbit. This finding would open up a new possibility for concentrated solar panel application that is both efficient, low cost, and for a broad incident angle of sunlight.