Spectrally selective coherent thermal radiation by near-field optical effects

本研究开发了一套近场热辐射分析系统，以研究近场热辐射的光谱特性。利用该装置，我们成功地测量了近场热辐射谱。本研究提供的主要知识如下：1.研制了一套高温工作的超高真空STM/SNOM系统。通过改变探针和样品表面之间的距离，在800 K下的光信号发生了急剧变化。实验结果表明，STM/SNOM系统能够探测到近场热辐射。2.通过改变针尖调制幅度，估计了金属（W）表面热辐射强度的距离依赖性。从这项研究中，3.用腔效应和表面等离子体激元-极化激元机制解释了三种不同腔深样品的热辐射谱; 4.发现近场热辐射强度在归一化区域比远场热辐射强度强10 ~ 100倍;野外热辐射

In this study, a near-field thermal radiation analyzing system was developed in order to study the spectral properties of near-field thermal radiation. Using the apparatus we succeeded in a measurement of near-field thermal radiation spectra. The knowledge provided through this study is as follows ;1.The super-high-vacuum type STM/SNOM system operated at high temperature was developed in this study. By changing distance between the probe and sample surface the optical signal was drastically changed at 800K. From this result it was confirmed that the near-field thermal radiation was detected by the STM/SNOM system.2.The distance dependence of thermal radiation intensity from metal (W) surface was estimated by changing the amplitude of tip-modulation. From this study, it was revealed that the near-field thermal radiation was localized at about 6nm range from the surface.3.The thermal radiation spectra from three different samples with different cavity depth were explained by the cavity-effect and surface plasmon-polariton mechanism.4.It was found that the intensity of near-field thermal radiation from the normalized area will be ten to hundred times stronger than that of far-field thermal radiation.