Cavity QED Effect in Thermal Radiation from a Microparticle(Research)

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Other Title
  • 微粒子の熱放射における共振器量子電磁気学的効果(最近の研究から)
  • 最近の研究から 微粒子の熱放射における共振器量子電磁気学的効果
  • サイキン ノ ケンキュウ カラ ビリュウシ ノ ネツ ホウシャ ニ オケル キョウシン キリョウコデンジキガクテキ コウカ

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Abstract

Although Planck's law of blackbody radiation well describes spectral profiles of thermal radiation from macroscopic objects, it is not applicable to particles of size comparable to optical wavelengths. 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 flow-assisted optical trapping levitates a single molten droplet of dielectric materials such as Al_2O_3 and TiO_2 to enable its emission spectroscopy. As the particle becomes smaller, a blackbody-like spectrum turns into a spectrum dominated by multiple peaks resonant with whispering gallery modes of the microsphere, showing that the spontaneous emission rate is modified by the discrete mode density.

Journal

  • Butsuri

    Butsuri 70 (4), 269-274, 2015-04-05

    The Physical Society of Japan

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