Active Radiative Thermal Switching with Graphene Plasmon Resonators

Area of Science:

• Nanoscale heat transfer
• Plasmonics
• Graphene physics

Background:

• Near-field radiative heat transfer (NFRHT) is crucial for thermal management.
• Graphene's unique electronic properties offer potential for tunable thermal devices.
• Overcoming the broadband nature of thermal radiation is key for efficient switching.

Purpose of the Study:

• To theoretically demonstrate a near-field radiative thermal switch.
• To leverage graphene's tunability and plasmonic resonances for enhanced thermal modulation.
• To investigate the impact of geometry and material properties on switch performance.

Main Methods:

• Theoretical modeling of NFRHT using surface plasmons in graphene resonators.
• Nonlinear optimization to analyze stacked and isolated graphene sheet geometries.
• Derivation of analytical approximations for resonant heat transfer.

Main Results:

• Achieved substantial modulation of NFRHT by exploiting graphene's tunability and resonant structures.
• Demonstrated >10x higher modulation in isolated graphene resonators compared to parallel sheets.
• Identified carrier mobility as a critical parameter for switch performance.

Conclusions:

• The proposed graphene-based radiative thermal switch offers significant modulation capabilities.
• The findings are relevant for active thermal management, energy harvesting, and nanoscale probing.
• Analytical approximations provide general scaling laws for resonator-based heat transfer.