Amplification of near field radiation at surfaces of pure dielectric domain with anti-reflection films and photonic crystal structures
Amplification of near field radiation at surfaces of pure dielectric domain with anti-reflection films and photonic crystal structures
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DOI：
10.1088/1361-6463/acc8e2
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发表时间：
2023-03
期刊：
影响因子：
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通讯作者：
Sy-Bor Wen;Aravind Jakkinapalli
中科院分区：
文献类型：
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作者：
Sy-Bor Wen;Aravind Jakkinapalli
由于在高温下具有化学稳定性，介电材料可以成为不同能源应用的理想热发射体。然而，电介质材料不支持近红外范围的表面波用于更长距离的热光子隧穿，这限制了它们在近场热辐射中的应用。在这项研究中，它表明，热场放大在近红外波长的介质表面可以通过非对称的法布里-珀罗谐振与减反射涂层或一维光子晶体类型的结构来实现。当这些薄膜结构被添加到发射极和收集极表面时，可以实现近100 nm的近红外热光子隧穿。在这两种薄膜结构中，用与发射极/集电极材料相同的高折射率材料构造的1D光子晶体型周期性结构允许在大的平行波数下的近场热光子隧穿。此外，可以通过添加更多的一维光子晶体层来增加场放大，以实现更长距离的近场热光子隧穿。
With chemical stability under high temperatures, dielectric materials can be idealized thermal emitters for different energy applications. However, dielectric materials do not support surface waves at near-infrared ranges for longer-distance thermal photon tunneling, which limits their applications in near-field thermal radiation. It is demonstrated in this study that thermal field amplification at near-infrared wavelengths at dielectric surfaces could be achieved through asymmetric Fabry–Perot resonance with anti-reflection coatings or 1D photonic crystal type structures. ⩾100 nm near-infrared thermal photon tunneling can be achieved when these thin film structures are added to the emitter and the collector surfaces. Among these two thin film structures, 1D photonic crystal type periodic structures constructed with the same high refractive index material as the emitter/collector material allow near-field thermal photon tunneling at large parallel wavenumbers. Moreover, the field amplification can be increased by adding more 1D photonic crystal layers to achieve even longer distances near field thermal photon tunneling.