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首页> 外文期刊>Nanotechnology >Wavelength-selective emitters with pyramid nanogratings enhanced by multiple resonance modes
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Wavelength-selective emitters with pyramid nanogratings enhanced by multiple resonance modes

机译：通过多种共振模式增强具有金字塔纳米光栅的波长选择发射器

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摘要

Binary gratings with high or low metal filling ratios in a grating region have been demonstrated as successful candidates in enhancing the emittance of emitters for thermophotovoltaics since they could support surface plasmons (SPs), the Rayleigh-Wood anomaly (RWA), or cavity resonance (CR) within their geometries. This work shows that combining a tungsten binary grating with a low and high filling ratio to form a pyramid grating can significantly increase the emittance, which is nearly perfect in the wavelength region from 0.6 to 1.72 mu m, while being 0.1 at wavelengths longer than 2.5 mu m. Moreover, the emittance spectrum of the hybrid tungsten grating is insensitive to the angle of incidence. The enhancement demonstrated by magnetic field and Poynting vector patterns is due to the interplay between SPs and RWA modes at short wavelengths, and CR at long wavelengths. Furthermore, a combined grating made of nickel is also proposed providing enhanced emittance in a wide angle of incidence.
机译：已证明在光栅区域中具有高或低金属填充率的二元光栅可以成功地提高热光电发射器的发射率，因为它们可以支持表面等离激元（SP），瑞利-伍德异常（RWA）或腔共振（ CR）。这项工作表明，将低填充率和高填充率的钨二元光栅结合起来形成金字塔形光栅可以显着提高发射率，该发射率在0.6至1.72μm的波长范围内几乎是完美的，而在大于2.5的波长下为0.1亩此外，混合钨光栅的发射光谱对入射角不敏感。磁场和Poynting矢量模式显示出的增强是由于短波长的SP和RWA模式之间的相互作用以及长波长的CR之间的相互作用。此外，还提出了由镍制成的组合光栅，其在宽入射角下提供增强的发射率。

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