Development of a polarization-insensitive thermophotovoltaic emitter with a binary grating.
Development of a polarization-insensitive thermophotovoltaic emitter with a binary grating.
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DOI：
10.1364/oe.20.005882
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发表时间：
2012-03
期刊：
影响因子：
3.8
通讯作者：
N. Nguyen-Huu;Yu-Bin Chen;Y. Lo
中科院分区：
文献类型：
--
作者：
N. Nguyen-Huu;Yu-Bin Chen;Y. Lo
利用二元钨光栅数值开发了一种波长选择性但偏振不敏感的热光伏发射器，并通过分析证明了其引人注目的发射光谱。通过表面等离子体激元的激发、空腔共振和特定波长下的伍德异常，初步限制了发射器尺寸的范围。然后，混合方案（严格的耦合波分析与遗传算法一起）能够精细地定制光栅轮廓，从而在近红外区域显着提高发射率。横向电极化和横向磁极化的峰值发射率分别为0.997和0.935。实际上，在短波长下，发射率几乎是普通钨板的两倍，但在长波长下，发射率显着降低。此外，这种光谱发射率对偏振和 5% 尺寸变化不敏感，使得发射器非常适合热光伏应用。电磁场和坡印廷矢量的模式能够证实物理机制的激发。
A wavelength-selective but polarization-insensitive thermophotovoltaic emitter was numerically developed with a binary tungsten grating and its appealing emittance spectra were demonstrated with analysis. Ranges of emitter dimensions were preliminarily confined with the excitation of the surface plasmon polariton, cavity resonance, and Wood's anomaly at specified wavelengths. Then, a hybrid scheme (the rigorous coupled wave analysis together with a genetic algorithm) was able to finely tailor the grating profile such that emittance could be significantly enhanced in the near infrared region. The peak emittance at the transverse electric and transverse magnetic polarizations was 0.997 and 0.935, respectively. The emittance was actually almost twice that from a plain tungsten plate at short wavelengths but significantly reduced at long wavelengths. Moreover, such spectral emittance is insensitive to the polarization and 5% dimension modification, making the emitter ideal for thermophotovoltaic applications. Patterns of electromagnetic fields and Poynting vectors were able to confirm the excitation of physical mechanisms.