基于金包覆倒置硅金字塔阵列的高效红外太阳光吸收器
Efficient infrared sunlight absorbers based on gold-covered, inverted silicon pyramid arrays
AI总结：
本文提出金包覆倒置硅金字塔阵列红外吸收器，通过调控结构参数激发表面等离激元极化激元，并结合FDTD模拟与FTIR测量优化，给出光刻和纳米压印两种可集成制备路线。
摘要：
硅在红外区域的透明性使得人们能够设计纳米/微米结构，以用于收集太阳光谱中红外（IR）部分的器件。在此，我们报道了一种采用覆有薄金膜的倒置硅金字塔阵列的策略，该阵列在红外光谱范围（低于Si带隙）内表现出显著的光吸收。该吸收源于金属/介电界面处表面等离激元极化激元在红外波长下的共振激发，主要通过调节倒置金字塔的尺寸和间距实现。阵列参数优化通过分别使用时域有限差分模拟和傅里叶变换红外光谱对红外响应进行计算与测量的迭代来推进。我们展示了这类金属/硅超材料的两条制备路线，即通过光刻或可规模化的纳米压印技术，以实现与光电子制造工艺的无缝集成。
英文摘要：
The transparency of silicon in the infrared region enables the design of nano/microstructures for implementation in devices to harvest the infrared (IR) part of the solar spectrum. Herein we report a strategy that uses arrays of inverted silicon pyramids covered with a thin gold film, which exhibit substantial light absorption in the infrared spectral range (below the gap of Si). The absorption stems from the resonant excitation at infrared wavelengths of surface-plasmon polaritons at the metal/dielectric interface mainly by tuning size and separation of the inverted pyramids. The array-parameters optimization proceeded by iteration of the calculation and measurement of the infrared response using finite difference time-domain simulations and Fourier-transform IR spectroscopy, respectively. We show two fabrication routes for this kind of metal/silicon metamaterials either by photolithography or scalable nanoimprint techniques for a seamless integration in optoelectronic fabrication processes.
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