Near-field thermal radiation transfer controlled by plasmons in graphene

• Published in: Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-04, Vol.85 (15), Article 155422
• Main Authors: Ilic, Ognjen, Jablan, Marinko, Joannopoulos, John D., Celanovic, Ivan, Buljan, Hrvoje, Soljačić, Marin
• Format: Article
• Language: English
• Subjects: Condensed matter; Direct power generation; Doping; Graphene; Plasmons; Relaxation time; Separation; solar (photovoltaic), solar (thermal), solid state lighting, phonons, thermal conductivity, thermoelectric, defects, mechanical behavior, charge transport, spin dynamics, materials and chemistry by design, optics, synthesis (novel materials), synthesis (self-assembly), synthesis (scalable processing); Thermoelectricity
• ISSN: 1098-0121; 1550-235X
• DOI: 10.1103/PhysRevB.85.155422

It is shown that thermally excited plasmon-polariton modes can strongly mediate, enhance, and tune the near-field radiation transfer between two closely separated graphene sheets. The dependence of near-field heat exchange on doping and electron relaxation time is analyzed in the near infrared within the framework of fluctuational electrodynamics. The dominant contribution to heat transfer can be controlled to arise from either interband or intraband processes. We predict maximum transfer at low doping and for plasmons in two graphene sheets in resonance, with orders-of-magnitude enhancement (e.g., 10 super(2) to 10 super(3) for separations between 0.1 mu m and 10 nm) over the Stefan-Boltzmann law, known as the far-field limit. Strong, tunable, near-field transfer offers the promise of an externally controllable thermal switch as well as a novel hybrid graphene-graphene thermoelectric/thermophotovoltaic energy conversion platform.