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Label-free Single Molecule Detection Using Microtoroid Optical Resonators
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TDM-controlled ring resonator arrays for fast, fixed-wavelength optical biosensing.

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    A new control method for ring resonator arrays uses time-division multiplexing and thermal tuning. This enables rapid biological kinetic sampling without a tunable laser, achieving 100 Hz read-out rates per ring.

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    Area of Science:

    • Photonics
    • Optical Sensors
    • Biotechnology

    Background:

    • Ring resonator arrays are crucial for sensing applications.
    • Existing control methods often limit sampling rates.
    • Fast biological kinetic analysis requires high-speed sensor read-out.

    Purpose of the Study:

    • To present a novel control concept for serial ring resonator arrays.
    • To enable fast sampling rates for biological kinetics.
    • To demonstrate high read-out rates without a tunable laser source.

    Main Methods:

    • Utilized a time-division multiplex (TDM) approach for control.
    • Employed thermal tuning of the effective refractive index.
    • Implemented thermo-optical multiplexing in silicon-on-insulator (SOI) ring resonator arrays.

    Main Results:

    • Achieved fast sampling rates suitable for biological kinetics.
    • Demonstrated high read-out rates of 100 Hz for each individual ring.
    • Successfully operated the system using a fixed wavelength, eliminating the need for a tunable laser.

    Conclusions:

    • The proposed TDM control concept offers an efficient method for high-speed sensing.
    • This approach enhances the performance of SOI ring resonator arrays for kinetic studies.
    • The technology facilitates rapid, label-free analysis in biological applications.