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    We developed a compact two-mirror system for diffuse light concentration, achieving near-thermodynamic limits. This flexible design efficiently concentrates light for various target shapes and dimensions.

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    Area of Science:

    • Optics and Photonics
    • Optical Engineering

    Background:

    • Diffuse light sources present challenges for efficient energy harvesting and manipulation.
    • Traditional concentrators often struggle with non-uniform or spatially varying light distributions.

    Purpose of the Study:

    • To introduce a novel, compact two-mirror system for effective diffuse light concentration.
    • To demonstrate the system's design flexibility and efficiency across different geometries and dimensions.

    Main Methods:

    • Utilizing the principle of local conservation of optical brightness for system design.
    • Developing computational methods to determine mirror shapes for arbitrary incident light and target geometries.
    • Conducting numerical experiments to validate theoretical predictions.

    Main Results:

    • The two-mirror system achieves high diffuse light concentration efficiency.
    • Demonstrated efficient concentration for both flat and cylindrical target shapes.
    • Confirmed efficient one-dimensional and two-dimensional light concentration.

    Conclusions:

    • The proposed system offers a simple and compact solution for diffuse light concentration.
    • The design's flexibility allows for adaptation to various applications.
    • Numerical results closely approach the theoretical thermodynamic limit, showcasing high performance.