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External light-concentrating structures designed for fluorescent antennas based on refractive index modulation.

Yibo Wang, Zhe Lv, Yang Wang

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    |January 29, 2025
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    Summary

    This study introduces novel light-concentrating structures for fluorescent antennas (FAs) in optical wireless communication (OWC). These structures significantly boost optical power density and improve signal-to-noise ratio (SNR) for enhanced OWC systems.

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    Area of Science:

    • Optoelectronics
    • Optical Wireless Communication
    • Nanophotonics

    Background:

    • Fluorescent antennas (FAs) offer advantages in optical wireless communication (OWC) over traditional systems, including higher optical gain and wider field of view (FoV).
    • Optimizing light management is crucial for maximizing the performance of FAs in OWC applications.
    • Existing methods for enhancing FA performance often involve trade-offs with other device metrics.

    Purpose of the Study:

    • To develop and validate a COMSOL-based model for optimizing external light-concentrating structures for FAs.
    • To design novel light-concentrating structures that enhance optical power density and signal-to-noise ratio (SNR) for FAs.
    • To assess the performance improvements offered by these structures compared to existing designs.

    Main Methods:

    • A COMSOL-based model was developed and validated for simulating light-concentrating structures.
    • Two distinct structures were designed utilizing refractive index modulation and conservation of optical étendue.
    • The first structure employed optical fibers, while the second integrated a Compound Parabolic Concentrator (CPC) with varying refractive indices.

    Main Results:

    • The optical fiber-coupled structure achieved up to a 1.5-fold increase in optical power density.
    • The CPC-integrated structure theoretically enhanced optical power density by approximately 2.5 times with refractive index matching.
    • Both structures improved the system's SNR without negatively impacting other device performance metrics.

    Conclusions:

    • External light-concentrating structures, particularly CPC-based designs, can significantly enhance the performance of fluorescent antennas in OWC.
    • The proposed structures offer a method to boost optical power density and SNR, crucial for efficient OWC.
    • The COMSOL model provides a reliable tool for designing and optimizing such photonic structures.