Abbaszadeh Afshin, Tehranian Ali, Salehi Jawad A
Opt Express. 2021 Oct 25;29(22):36900-36914. doi: 10.1364/OE.441356.
Recently, metasurfaces capable of manipulating the amplitude and the phase of an incident wave in a broad frequency band have been employed for femtosecond optical pulse shaping purposes. In this study, we introduce a phase-only pulse shaper based on an all-dielectric CMOS-compatible polarization-insensitive metasurface, composed of Si nano cylinders sitting on a fused silica substrate. The required phase profile of the metasurface for desired waveforms are calculated using an iterative Fourier transform algorithm, and the performance of the pulse shaper metasurface in implementing the phase masks was assessed using full-wave simulations. Such approach for realizing a polarization-insensitive metasurface-based phase-only pulse shaper has never been investigated to the best of our knowledge. It is demonstrated that the simulated results of the proposed metasurface-based pulse shaper is in great agreement with the results of the algorithm, while exhibiting a very high transmission efficiency. This work indicates yet another exciting but not fully examined application of meta-structures that is the optical pulse shaping.
最近，能够在宽频带内操纵入射波振幅和相位的超表面已被用于飞秒光脉冲整形目的。在本研究中，我们介绍了一种基于全介质CMOS兼容偏振不敏感超表面的纯相位脉冲整形器，该超表面由位于熔融石英衬底上的硅纳米柱组成。使用迭代傅里叶变换算法计算超表面实现所需波形所需的相位分布，并使用全波模拟评估脉冲整形器超表面在实现相位掩模方面的性能。据我们所知，这种实现基于偏振不敏感超表面的纯相位脉冲整形器的方法从未被研究过。结果表明，所提出的基于超表面的脉冲整形器的模拟结果与算法结果非常吻合，同时具有非常高的传输效率。这项工作表明了超结构的另一个令人兴奋但尚未充分研究的应用，即光脉冲整形。
