SGER: The Spectral Dependence of Thermal Radiation in Micron Scale Spaces on the Optical Properties of Surface Microstructures

摘要提案编号：CTS-0421661首席研究员：James Hammons所属单位：纽约市立大学提案题目：SGER：微米尺度空间中热辐射对表面微结构光学性质的光谱依赖性表面极化激元（SP）是物体表面的电磁波和等离子体波或声子波耦合，可以由可见光或热能驱动。在热能的情况下，相关联的辐射能量具有宽的光谱范围，而SP具有相对短的光谱范围，因此可用于特定应用，例如使用热光伏（TVP）电池的那些应用，其通常是光谱选择性的。然而，SP不能将能量从身体表面带走，并且在没有某些耦合机制的帮助下，它们的特殊光谱特性不能被利用。最近的实验和理论结果表明，微米和亚微米尺度的表面纹理可以改变光谱的热辐射性能的距离超出从基板表面的微米级制度，因为热驱动SP的分散在纹理。虽然它已被证明在理论和实验上的热辐射的光谱特性可以通过SP散射在表面光栅的影响，定量分析如何变化的散射网站的光学特性可以影响热辐射是缺乏的。在这项研究中，第一步调查移动热辐射通过SP散射将完成开发的初步方法，这将是有用的，在了解光谱特性的辐射，结果从SP散射，以及如何这个频谱是相关的基板和岛屿的谐振频率。为此，将通过在远场极限中展开散射SP来获得近似解析解。这项工作将代表第一次这样的研究，如果成功的话，将证明更大的控制热排放是可能的，从而允许更大的优化TPV和相关设备。

AbstractProposal Number: CTS-0421661Principal Investigator: James HammondsAffiliation: CUNY City College of New YorkProposal Title: SGER: The spectral dependence of thermal radiation in micron scale spaces on the optical properties of surface microstructuresSurface polaritons (SP) are coupled electromagnetic and plasmon or phonon waves at the surface of a body, and can be driven by visible light or thermal energy. In the case of thermal energy, the associated radiated energy has a broad spectral range, while SP's have a relatively short spectral range and thus could be useful for particular applications such as those using thermophotovoltaic (TVP) cells, which are typically spectrally selective. SP's however, do not carry energy away from the body surface, and without the aid of some coupling mechanism, their special spectral properties cannot be utilized. Recent experimental and theoretical results suggest that micron and submicron scale surface texturing can alter the spectral thermal radiation properties at distances beyond the microscale regime from a substrate surface, because thermally driven SP's are scattered at the textures. While it has been demonstrated theoretically and experimentally that the spectral properties of thermal radiation can be affected by SP scattering at surface gratings, quantitative analysis of how varying the optical properties of the scattering sites can affect thermal radiation is lacking. In this research, a first step to investigating shifting thermal radiation via SP scattering will be accomplished by developing preliminary methods that will be useful in understanding the spectral properties of the radiation that results from SP scattering, and how this spectrum is related to the resonance frequencies of both the substrate and the islands. To do so, approximate analytical solutions will be obtained by developing the scattered SP in the far field limit. This work would represent the first such study and, if successful, would demonstrate that even greater control of thermal emission is possible, thus allowing for greater optimization of TPV and related devices.