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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Silicon photonic integrated circuits with electrically programmable non-volatile memory functions.

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    This study introduces an electrically programmable microring resonator, a novel silicon photonic device offering on-chip memory. This innovation enables multi-level memory functions for advanced optical routing and computing, meeting high data demands.

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    Area of Science:

    • Photonics and Integrated Circuits
    • Materials Science
    • Electrical Engineering

    Background:

    • Conventional silicon photonic integrated circuits lack inherent memory functions, necessitating continuous power for state maintenance.
    • On-chip memory is crucial for advanced optical switching routes and efficient data processing.

    Purpose of the Study:

    • To present an electrically programmable add/drop microring resonator with integrated memory capabilities.
    • To demonstrate the feasibility of multi-level memory functions in silicon photonics.

    Main Methods:

    • Fabrication of an electrically programmable microring resonator.
    • Utilizing electrical pulses to control and switch between device states.
    • Experimental characterization of wavelength shift and light intensity variation.

    Main Results:

    • Achieved a wavelength shift of 426 pm between ON/OFF states.
    • Demonstrated a wavelength shift rate of 2.8 pm/ms and light intensity variation of ~0.12 dB/ms.
    • Theoretically projected capacity for up to 65 multi-level memory states.

    Conclusions:

    • The developed microring resonator offers a viable solution for on-chip optical memory.
    • Integration into wavelength division multiplexing (WDM) filters and optical routers can enhance data handling capabilities.
    • This technology supports the development of efficient optical computing architectures for large data demands.