Surface Phonon Polaritons Mediated Energy Transfer between Nanoscale Gaps
Surface Phonon Polaritons Mediated Energy Transfer between Nanoscale Gaps
复制标题
DOI：
10.1021/nl901208v
复制
发表时间：
2009-08-01
期刊：
影响因子：
10.8
通讯作者：
Chen, Gang
中科院分区：
文献类型：
--
作者：
Shen, Sheng;Narayanaswamy, Arvind;Chen, Gang
表面声子极化子是沿着极性电介质界面传播的电磁波，并在红外频率下在界面附近表现出大的局部场增强。理论计算表明，这种表面波会导致近场普朗克黑体辐射定律的崩溃。在这里，我们通过实验证明，通过测量微球与平面之间的辐射传热（间隔小至 30 nm），表面声子极化激元可显着增强小间隙处两个表面之间的能量传递。纳米级间隙处相应的传热系数比黑体辐射极限大3个数量级。高能量通量可用于开发新的辐射冷却和热光伏技术。
Surface phonon polaritons are electromagnetic waves that propagate along the interfaces of polar dielectrics and exhibit a large local-field enhancement near the interfaces at infrared frequencies. Theoretical calculations show that such surface waves can lead to breakdown of the Planck's blackbody radiation law in the near field. Here, we experimentally demonstrate that surface phonon polaritons dramatically enhance energy transfer between two surfaces at small gaps by measuring radiation heat transfer between a microsphere and a flat surface down to 30 nm separation. The corresponding heat transfer coefficients at nanoscale gaps are 3 orders of magnitude larger than that of the blackbody radiation limit. The high energy flux can be exploited to develop new radiative cooling and thermophotovoltaic technologies.