Narrow-Band Thermal Radiation with Low Directivity by Resonant Modes inside Tungsten Microcavities
Narrow-Band Thermal Radiation with Low Directivity by Resonant Modes inside Tungsten Microcavities
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DOI：
10.1143/jjap.43.5253
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发表时间：
2004-08
影响因子：
1.5
通讯作者：
F. Kusunoki;Tatsuro Kohama;T. Hiroshima;S. Fukumoto;J. Takahara;Tetsuro Kobayashi
中科院分区：
文献类型：
--
作者：
F. Kusunoki;Tatsuro Kohama;T. Hiroshima;S. Fukumoto;J. Takahara;Tetsuro Kobayashi
利用钨表面周期性微腔阵列实现了低方向性的窄带热辐射。研究发现，微腔内部的热激发共振模式可以增强特定波长的热辐射。与平坦的钨表面相比，微腔的热辐射在最大增强波长∼=5.5µm处增强了2 0 0%，产生了半高宽为λ=0.5 9µm的窄带热辐射，用一个简单的腔谐振腔模型很好地解释了增强峰的位置。通过测量倾斜方向的热辐射，还发现这种窄带辐射具有较低的方向性。
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 ∼200% at the most enhanced wavelength of λ=5.5 µm. This strong enhancement yields narrow-band thermal radiation with a full width at half maximum of Δλ=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.