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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Photon tunneling into a single-mode planar silicon waveguide.

Liping Fang, Kian S Kiang, Nicholas P Alderman

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    |December 25, 2015
    PubMed
    Summary

    We show how fluorescent dye molecules can directly excite silicon waveguides via photon tunneling. This finding could lead to efficient light trapping in ultrathin crystalline silicon solar cells.

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    Area of Science:

    • Photonics
    • Materials Science
    • Quantum Mechanics

    Background:

    • Efficient light management is crucial for next-generation solar cells.
    • Ultrathin crystalline silicon offers potential for advanced photovoltaic devices.
    • Controlling light-matter interactions at the nanoscale is key for device miniaturization.

    Purpose of the Study:

    • To demonstrate direct excitation of a single transverse electric (TE) mode in a crystalline silicon waveguide.
    • To investigate photon tunneling from fluorescent dye molecules to the silicon waveguide.
    • To explore the potential application of this phenomenon in ultrathin solar cell technology.

    Main Methods:

    • Deposition of a fluorescent dye layer using the Langmuir-Blodgett technique.
    • Fabrication of a 25 nm thick planar crystalline silicon waveguide.
    • Measurement of photon tunneling rates as a function of dye-silicon separation.
    • Theoretical modeling of photon tunneling using a novel quantum mechanical approach.

    Main Results:

    • Successful direct excitation of a single TE mode in the silicon waveguide.
    • Observed photon tunneling rates showed good agreement with theoretical predictions.
    • The tunneling rate was found to be dependent on the separation distance between the dye and silicon.

    Conclusions:

    • Photon tunneling from fluorescent molecules provides an effective method for exciting silicon waveguides.
    • The developed quantum mechanical framework accurately describes the observed tunneling phenomenon.
    • Simple light trapping structures involving molecules on silicon could enhance the efficiency of future ultrathin crystalline silicon solar cells.