Infrared grills work by igniting propane or natural gas to superheat a ceramic tile, causing it to emit infrared radiation. The thermal radiation is generated when heat from the movement of charged particles within atoms is converted to electromagnetic radiation in the infrared heat frequency range.
IR offers heat that is uniformly distributed across the cooking surface and temperatures reach over 900 °F. This technology was previously patented, but the patents expired in 2000 and more companies have started offering infrared grills at lower prices.
The Daily Omnivore 
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