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Multimode photonic molecules for advanced force sensing.

Nicoletta Granchi, Maurangelo Petruzzella, Dario Balestri

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    This summary is machine-generated.

    We developed a novel optical force sensor using reconfigurable photonic molecules on crystal membranes. This sensor achieves picosecond-newton sensitivity for force and torque detection, pinpointing force application location.

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    Area of Science:

    • Photonics and Materials Science
    • Nanotechnology and Sensor Development

    Background:

    • Optical detection methods offer high sensitivity and non-invasive measurement capabilities.
    • Photonic molecules, formed by coupled optical cavities, exhibit unique spectral properties sensitive to external stimuli.
    • Photonic crystal membranes provide a versatile platform for creating nanostructured optical devices.

    Purpose of the Study:

    • To propose and validate a novel optical force sensor based on a reconfigurable multi-cavity photonic molecule.
    • To demonstrate the sensor's capability for high-sensitivity force and torque measurement.
    • To investigate the sensor's ability to localize the applied force.

    Main Methods:

    • Fabrication of a device comprising two parallel photonic crystal membranes with a reconfigurable multi-cavity photonic molecule.
    • Development of an analytical model using coupled mode theory to describe the system's spectral behavior.
    • Validation of the analytical model using finite difference time domain (FDTD) simulations.
    • Monitoring the deformation of the upper membrane via changes in the spectral positions of photonic molecule resonances.

    Main Results:

    • The proposed system functions as a force sensor with picosecond-newton sensitivity.
    • The sensor can accurately identify the position of applied force.
    • The system also operates as a torque sensor, measuring membrane torsion in two perpendicular directions.

    Conclusions:

    • The reconfigurable photonic molecule sensor demonstrates high potential for precise force and torque sensing.
    • The optical detection mechanism offers a sensitive and localized measurement approach.
    • This technology opens avenues for advanced nanoscale metrology and manipulation.