Surface plasmon modes and the Casimir energy.

Area of Science:

• Condensed Matter Physics
• Quantum Field Theory
• Surface Science

Background:

• The Casimir effect describes an attractive force between closely spaced neutral conducting plates.
• Understanding the quantum vacuum fluctuations and their interactions is key in fundamental physics.

Purpose of the Study:

• To investigate the influence of surface plasmons on the Casimir effect between metallic mirrors.
• To analyze the contributions of different modes to the Casimir energy.

Main Methods:

• Utilizing the plasma model to describe the optical response of metallic mirrors.
• Expressing the Casimir energy as a sum of contributions from evanescent surface plasmon modes and propagative cavity modes.

Main Results:

• Surface plasmon contributions are essential for the correct Casimir energy at all distances.
• One plasmonic mode provides a repulsive force, balancing attractive forces from cavity modes.
• Individual mode contributions can exceed the total Casimir energy.

Conclusions:

• Surface plasmons play a critical role in determining the Casimir effect.
• The interplay between plasmonic and cavity modes allows for potential tailoring of the Casimir force sign.