Measurement of near-field thermal emission spectra using an internal reflection element
Measurement of near-field thermal emission spectra using an internal reflection element
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DOI：
10.1103/physrevb.100.235450
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发表时间：
2018-10
影响因子：
3.7
通讯作者：
Saman Zare;C. Tripp;Sheila Edalatpour
中科院分区：
文献类型：
--
作者：
Saman Zare;C. Tripp;Sheila Edalatpour
我们描述了一种简单而强大的方法，使用内反射元件作为红外波导来测量近场热发射光谱。我们通过实验证明了由于石英和无定形二氧化硅中的表面声子极化激元的激发以及由于无定形二氧化硅和聚四氟乙烯中的受抑全内反射模式，各向同性介质的近场热发射的光谱窄峰。此外，我们证明了宽带近场热发射的双曲模式的六方氮化硼，这是一个各向异性的单轴介质。我们还提出了一个理论方法的基础上的波动电动力学和并矢绿色的功能为一维分层介质的测量光谱的准确建模。
We describe a simple and robust method using an internal reflection element acting as an infrared waveguide to measure the spectra of near-field thermal emission. We experimentally demonstrate the spectrally-narrow peaks of near-field thermal emission by isotropic media due to the excitation of surface phonon-polaritons in quartz and amorphous silica and due to the frustrated total-internal-reflection modes in amorphous silica and polytetrafluoroethylene. Additionally, we demonstrate the broadband near-field thermal emission of hyperbolic modes in hexagonal boron nitride which is an anisotropic uniaxial medium. We also present a theoretical approach based on the fluctuational electrodynamics and dyadic Green's functions for one-dimensional layered media for accurate modeling of the measured spectra.