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Monday, November 30, 2009

Mode-selective thermal radiation from a microparticle

Hitoshi Odashima, Maki Tachikawa, and Kei Takehiro

We experimentally demonstrate that thermal radiation from a micron-sized dielectric particle depends sensitively on its size and shape through the cavity quantum-electrodynamic effect. Our laser trapping technique levitated a high-temperature microsphere of Al2O3 and enabled emission spectroscopy of the single particle. As the particle becomes smaller, a blackbody like spectrum turns into a spectrum dominated by multiple peaks resonant with whispering gallery modes of the spherical resonator. The observed sharp frequency selectivity is applicable to spectral control of thermal radiation.

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