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首页> 外文会议>SPIE Conference on Photonic and phononic crystal materials and devices >High-Efficiency Photonic Crystal Narrowband Thermal Emitters
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High-Efficiency Photonic Crystal Narrowband Thermal Emitters

机译：高效光子晶体窄带热发射器

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Photonic crystals (PhC) are artificial structures fabricated with a periodicity in the dielectric function. This periodic electromagnetic potential results in creation of energy bandgaps where photon propagation is prohibited. PhC structures have promising use in thermal applications if optimized to operate at specific thermal emission spectrum. Here, novel utilization of optimized PhC's in thermal applications is presented. We demonstrate through numerical simulation the modification of the thermal emission spectrum by a metallic photonic crystal (PhC) to create high-efficiency multispectral thermal emitters. These emitters funnel radiation from a broad emission spectrum associated with a Plancklike distribution into a prescribed narrow emission band. A detailed quantitative evaluation of the spectral and power efficiencies of a PhC thermal emitter and its portability across infrared (IR) spectral bands are provided. We show an optimized tungsten PhC with a predominant narrow-band emission profile with an emitter efficiency that is more than double that of an ideal blackbody and～65-75% more power-efficiency across the IR spectrum. We also report on using optimal three-dimensional Lincoln log photonic crystal (LL-PhC) emitters for thermophotovoltaic (TPV) generation as opposed to using a passive filtering approach to truncate the broadband thermal source emission to match the bandgap of a photovoltaic (PV) cell. The emitter performance is optimized for the 1-2μm PV band using different PhC materials, specifically copper, silver and gold. The use of the proposed PhC in TPV devices can produce significant energy savings not reported before. The optimal design of the PhC geometry is obtained by implementing a variety of optimization methods integrated with artificial intelligence (AI) algorithms.
机译：光子晶体（PHC）是在介质功能中具有周期性的人工结构。这种周期性电磁势导致禁止光子传播的能量带隙的产生。如果优化在特定的热发射光谱下操作，PHC结构在热应用中具有希望的使用。这里，提出了新的使用优化PHC在热应用中的新颖利用。我们通过数值模拟证明了金属光子晶体（PHC）的热发射光谱的修改，以产生高效多光谱热发射器。这些发射器从与普通发射光谱漏斗的漏极辐射与普通的纤维分布相关联到规定的窄发射带中。提供了对PHC热发射器的光谱和功率效率的详细定量评估及其跨红外（IR）光谱带的可移植性。我们展示了优化的钨PHC，具有主要的窄带发射轮廓，发射极效率，在IR光谱上具有〜65-75％的高功率效率。我们还报告了使用最佳的三维林肯日志光子晶体（LL-PHC）发射器，用于蒸粒（TPV）发电，而不是使用无源滤波方法截断宽带热源发射以匹配光伏（PV）的带隙细胞。使用不同的PHC材料，特别是铜，银和金，优化发射极性性能为1-2μmPV频带。在TPV器件中使用所提出的PHC可以产生显着的节能，以前未报告。通过实现与人工智能（AI）算法集成的各种优化方法来获得PHC几何的最佳设计。

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