Hide it to see it better: a robust setup to probe the thermal Casimir effect

Area of Science:

• Condensed matter physics
• Surface science
• Quantum mechanics

Background:

• The thermal Casimir force, a quantum electrodynamic effect, is crucial for understanding nanoscale interactions.
• Existing experimental methods struggle to isolate and measure this force accurately due to surface complexities and thermal effects.

Purpose of the Study:

• To propose a novel Casimir apparatus for unambiguous measurement of the thermal Casimir force.
• To develop a method that minimizes experimental uncertainties and allows discrimination between theoretical models.

Main Methods:

• Utilizing two sinusoidally corrugated nickel surfaces, with one surface coated in a thin, opaque gold layer.
• Implementing a measurement scheme based on the phase-dependent modulation of the Casimir force.
• Employing the gold layer as a low-pass filter to isolate the force between corrugations.

Main Results:

• The proposed setup allows for clean observation of the thermal Casimir force between corrugated surfaces.
• The measurement scheme is independent of electrostatic calibrations and surface optical property uncertainties.
• The method provides a clear pathway to distinguish between different theoretical predictions for the thermal Casimir effect.

Conclusions:

• The described Casimir setup and measurement protocol offer a robust method for studying the thermal Casimir force.
• This approach overcomes limitations of current experimental techniques, paving the way for precise tests of quantum vacuum effects.