Narrow-Band Thermal Radiation with Low Directivity by Resonant Modes inside Tungsten Microcavities

概要

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Narrow-band thermal radiation with low directivity is presented using a periodic array of microcavities on tungsten surfaces. Thermally excited resonant modes inside the microcavities are found to enhance thermal radiation at specific wavelengths. Compared with a flat tungsten surface, thermal radiation from the microcavities has been enhanced by ${\sim}200$% at the most enhanced wavelength of $\lambda=5.5$ μm. This strong enhancement yields narrow-band thermal radiation with a full width at half maximum of $\Delta \lambda=0.59$ μm. The enhancement peak positions are well explained using a simple cavity resonator model. By measuring thermal radiation at oblique directions, it is also found that this narrow-band radiation has low directivity.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-08-15