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Random object optical field diagnostics by using carbon nanoparticles.

Oleg V Angelsky, Claudia Yu Zenkova, Steen G Hanson

    Optics Express
    |March 17, 2021
    PubMed
    Summary
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    This study introduces carbon nanoparticles for optical diagnostics, enabling real-time tracking and phase reconstruction of complex light fields scattered by rough surfaces. This method enhances the understanding of light-matter interactions.

    Area of Science:

    • Optics
    • Materials Science
    • Nanotechnology

    Background:

    • Complex scalar optical fields are generated by light scattering and diffraction from rough surfaces.
    • Characterizing these fields is crucial for understanding light-matter interactions and developing advanced optical systems.
    • Existing diagnostic methods may have limitations in real-time analysis of intricate optical fields.

    Purpose of the Study:

    • To develop a novel approach for correlation optical diagnostics of complex scalar optical fields.
    • To utilize synthesized carbon nanoparticles as probes for analyzing light scattered from rough surfaces.
    • To reconstruct the intensity and phase distribution of optical speckle fields, including phase singularities.

    Main Methods:

    • Simulation of a rough surface to generate diffraction patterns of amplitude and phase.

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  • Hydrothermal synthesis of carbon nanoparticles from citric acid and urea, followed by centrifugation.
  • Utilizing the luminescence and size-dependent optical properties of carbon nanoparticles for real-time position registration.
  • Applying Hilbert transform for analyzing the optical speckle field skeleton and restoring phase information.

    • Main Results:

    • Successful synthesis of carbon nanoparticles with specific size and optical properties suitable for optical probing.
    • Demonstration of real-time registration of carbon nanoparticle positions via luminescence.
    • Development and display of an algorithm for reconstructing scalar optical field intensity from nanoparticle positions.
    • Restoration of the optical speckle field's phase, including phase singularities, using Hilbert transform.

    Conclusions:

    • Carbon nanoparticles offer a promising tool for correlation optical diagnostics of complex scalar optical fields.
    • The developed method allows for real-time intensity and phase reconstruction of speckle fields.
    • This approach advances the analysis of light scattering and diffraction phenomena from rough surfaces.