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Related Concept Videos

Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
705

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Electromagnetically induced transparency and absorption in a compact silicon ring-bus-ring-bus system.

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    We demonstrated electromagnetically induced transparency (EIT) and absorption (EIA) in a silicon ring-bus-ring-bus system. These phenomena arise from coherent interference, enabling novel optical control in integrated photonics.

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    Area of Science:

    • Photonics
    • Quantum Optics
    • Integrated Optics

    Background:

    • Electromagnetically induced transparency (EIT) and absorption (EIA) are quantum interference phenomena.
    • These effects offer precise control over light-matter interactions.
    • Compact integrated photonic devices are crucial for advanced optical signal processing.

    Purpose of the Study:

    • To theoretically and experimentally demonstrate EIT and EIA in a novel silicon ring-bus-ring-bus (RBRB) system.
    • To analyze the underlying physics of coherent interference in the RBRB structure.
    • To validate the device performance through simulation and fabrication.

    Main Methods:

    • Theoretical modeling using temporal coupled mode theory.
    • Numerical simulations employing the finite-difference time-domain (FDTD) method.
    • Fabrication of RBRB structures on a silicon-on-insulator (SOI) platform.

    Main Results:

    • Simultaneous observation of EIT and EIA phenomena in the RBRB system.
    • Coherent interference between radiant and subradiant modes leads to distinct spectral features.
    • Experimental transmission spectra align with theoretical predictions and FDTD simulations.

    Conclusions:

    • The compact silicon RBRB system effectively exhibits both EIT and EIA.
    • This work provides a viable platform for integrated optical devices with tunable transparency and absorption.
    • The demonstrated phenomena have potential applications in optical switching, sensing, and quantum information processing.