Semiconductors have been widely utilized to fabricate optoelectronic devices. Nevertheless, it is still a challenging task to achieve high-quality (Q) resonant light absorption using the high-refractive-index semiconductors. In this work, we propose a facile scheme for multi-band perfect absorption in the near-infrared range using an array of core-shell cylinder-shaped resonators which are composed of gold nanowires and thin silicon shells. Based on the cooperative effects between the photonic modes of the semiconductor cavity and the plasmonic resonances of the metal resonator, five sharp absorption peaks are observed with the maximal absorption close to 100% (99.98%) and a high Q factor up to 208. Moreover, different semiconductors such as gallium arsenide, indium arsenide, indium phosphide have been exploited to reproduce the sharp perfect absorption in this core-shell resonators platform. The remarkable features make the proposed system potential for multiple applications such as multispectral filtering, photo-detection and hot electron generation.

中文翻译：

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用于高 Q 多波段近红外波吸收的硅金纳米线谐振器

半导体已被广泛用于制造光电器件。尽管如此，使用高折射率半导体实现高质量 (Q) 共振光吸收仍然是一项具有挑战性的任务。在这项工作中，我们提出了一种使用由金纳米线和薄硅壳组成的核壳圆柱状谐振器阵列在近红外范围内实现多波段完美吸收的简便方案。基于半导体腔的光子模式和金属谐振器的等离子体共振之间的协同效应，观察到五个尖锐的吸收峰，最大吸收接近 100% (99.98%)，Q 因子高达 208。 此外。 , 不同的半导体，如砷化镓、砷化铟、磷化铟已被用于在该核壳谐振器平台中重现尖锐的完美吸收。显着的特点使所提出的系统具有多种应用的潜力，例如多光谱滤波、光电检测和热电子生成。