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Updated: Dec 25, 2025

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Resolution-improved SPR sensor with a rotational modulation method.

Liuxia Wei, Chengcheng Feng, Libo Yuan

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    This summary is machine-generated.

    This study introduces a novel rotational modulation method for surface plasmon resonance (SPR) sensors, enhancing measurement resolution without expensive equipment. The technique improves incident angle modulation, offering a cost-effective solution for SPR sensing applications.

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    Area of Science:

    • Photonics and Sensor Technology
    • Optical Metrology
    • Surface Science

    Background:

    • Conventional surface plasmon resonance (SPR) sensors often require high-resolution rotating devices to improve measurement resolution.
    • Enhancing the modulation resolution of the incident angle is critical for improving SPR sensor performance.
    • Existing methods for improving SPR sensor resolution can be costly due to specialized equipment.

    Purpose of the Study:

    • To propose and validate a simple, effective rotational modulation method for resolution-improved prism coupler-based SPR sensors.
    • To demonstrate an alternative to expensive high-resolution rotating devices for SPR applications.
    • To investigate the applicability of the rotational modulation method to long-range SPR sensors.

    Main Methods:

    • Development of a horizontal prism rotation technique for modulating the incident angle.
    • Theoretical validation of the proposed rotational modulation method.
    • Experimental verification of the enhanced SPR sensor performance using the new method.

    Main Results:

    • The rotational modulation method significantly improves the measurement resolution of SPR sensors.
    • The proposed method offers a cost-effective alternative to conventional high-resolution rotating devices.
    • Theoretical simulations confirm the method's effectiveness and potential for long-range SPR sensors.

    Conclusions:

    • The developed rotational modulation method provides a practical and economical approach to enhance SPR sensor resolution.
    • This technique is broadly applicable to various SPR sensing platforms, including long-range SPR sensors.
    • The study presents a valuable advancement in SPR sensor technology for improved analytical performance.