Nanomechanical Particle Detector Using Optical Actuation

The patent replaces electrical actuation and detection methods with optical methods. A laser beam is used to excite the resonator mechanically, and a second laser beam detects the resonant frequency through optical interference or scattering. This substitution eliminates current circulation through the beam, preventing Joule heating and expanding material selection beyond conductive materials.

The patent uses optical fields (laser beams) as copies or proxies to interact with the resonator. Instead of embedding complex electrical sensing elements within the beam structure, the optical field serves as an external probe that measures the resonator's mechanical response. This simplifies the physical structure while maintaining high measurement precision through optical detection techniques.

The patent replaces electrical connections with optical connections. The laser beam acts as a wireless energy and information carrier that can excite and detect the resonator without physical contact. This eliminates the need for electrical contacts, bonding wires, or complex interconnect structures, thereby reducing the minimum feature sizes and enabling miniaturization.

The patent replaces direct mechanical coupling between the excitation source and the platform with optical coupling. The laser beam transfers energy wirelessly to the platform, eliminating the need for long mechanical beams that would couple the support to the platform. This allows short beams that minimize platform deformation while still enabling effective excitation and detection through optical means.