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.
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.
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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