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主要研究者：James hammonds隶属于纽约市立大学。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。表面极化子（SP）是在物体表面耦合的电磁和等离子体或声子波，可以由可见光或热能驱动。在热能的情况下，相关的辐射能量具有较宽的光谱范围，而SP具有相对较短的光谱范围，因此可以用于特定的应用，例如使用热光伏（TVP）电池的应用，这些电池通常具有光谱选择性。然而，SP并不携带能量离开体表，如果没有某种耦合机制的帮助，它们特殊的光谱性质就不能被利用。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距离衬底表面超过微尺度范围的光谱热辐射特性，因为热驱动的SP散射在纹理上。虽然理论和实验已经证明热辐射的光谱特性可以受到表面光栅SP散射的影响，但缺乏对散射点光学特性变化如何影响热辐射的定量分析。在这项研究中，通过开发初步方法来研究SP散射引起的热辐射转移，这将有助于理解SP散射引起的辐射的光谱特性，以及该光谱与基材和岛屿的共振频率之间的关系，从而完成研究SP散射引起的热辐射转移的第一步。为此，通过在远场极限处展开散射SP得到近似解析解。这项工作将是第一次这样的研究，如果成功，将证明对热辐射的更大控制是可能的，从而允许对TPV和相关设备进行更大的优化。

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.