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InP optical phased array for high-speed wavefront shaping through scattering media.

Zhiyu Chen, Marco Gagino, Yuchen Song

    Optics Letters
    |June 13, 2025
    PubMed
    Summary

    Researchers developed a new InP optical phased array (OPA) for faster wavefront shaping through scattering media. This technology achieves unprecedented speed and high power, advancing applications in imaging and communication.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Wavefront shaping (WFS) enables light control through scattering media for applications like non-line-of-sight (NLOS) imaging and optical wireless communication.
    • Conventional spatial light modulators (LC-SLMs, DMDs) have limited refresh rates (kHz), hindering real-time WFS with many channels.

    Purpose of the Study:

    • To demonstrate high-speed wavefront shaping through scattering media using an InP optical phased array (OPA).
    • To overcome the speed limitations of existing spatial light modulators for advanced optical applications.

    Main Methods:

    • Utilized an InP optical phased array (OPA) for spatial modulation of light wavefronts.
    • Employed on-chip electro-optic modulation for phase control.
    • Integrated amplifiers to boost output power.

    Main Results:

    • Achieved a record modulation bandwidth of 12 MHz, significantly exceeding current technologies.
    • Demonstrated high output power of up to 15.4 dBm with a 10.3 dB net on-chip gain.
    • Successfully performed wavefront shaping through scattering media at high speeds.

    Conclusions:

    • The InP OPA offers a two-orders-of-magnitude improvement in modulation speed for WFS.
    • The high power and speed of InP OPAs are suitable for demanding applications like NLOS imaging and high-speed optical communication.
    • InP OPAs represent a significant advancement for real-time, high-channel-count wavefront manipulation.