Building a Casimir metrology platform with a commercial MEMS sensor

Area of Science:

• Quantum physics
• Condensed matter physics
• Nanotechnology

Background:

• The Casimir Effect arises from quantum fluctuations of the electromagnetic vacuum.
• It manifests as an attractive force between closely spaced uncharged conductive surfaces.
• The force's magnitude depends on geometry and separation distance (e.g., d⁻⁴).

Purpose of the Study:

• To directly observe and measure the Casimir Effect under ambient conditions.
• To develop a novel measurement platform for quantum force detection.
• To explore applications in quantum metrology.

Main Methods:

• Utilized a modified capacitive micro-electromechanical system (MEMS) sensor.
• Employed a feedback-assisted pick-and-place assembly for microstructure attachment.
• Converted the MEMS from an inertial sensor to a direct force measurement platform with piconewton resolution.

Main Results:

• Successfully measured the Casimir force between a silver-coated microsphere and a gold-coated silicon plate.
• Demonstrated piconewton-level force resolution at room temperature.
• Observed the Casimir Effect in ambient, non-specialized conditions.

Conclusions:

• The developed MEMS system provides a direct measurement of the Casimir Effect.
• This technology represents a step towards practical quantum metrology.
• Potential for low-cost, sensitive, room-temperature quantum sensing applications.