Photonic Metasurfaces as Relativistic Light Sails for Doppler‐Broadened Stable Beam‐Riding and Radiative Cooling,Laser & Photonics Reviews

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Photonic Metasurfaces as Relativistic Light Sails for Doppler‐Broadened Stable Beam‐Riding and Radiative Cooling
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-07-08 , DOI: 10.1002/lpor.201900311
Mohammad Mahdi Salary ₁ , Hossein Mosallaei ₁

Affiliation

In this work, an all‐dielectric photonic metasurface with a flat macroscopic geometry is shown to provide a viable solution toward realization of a relativistic light sail driven by radiation pressure from high‐power lasers offering passive beam‐riding stability, efficient acceleration, and radiative cooling is demonstrated. A critical challenge that is addressed is sustaining acceleration and stability over the Doppler‐broadened propulsion band which is crucial for achieving relativistic velocities and requires the metasurface to maintain a high reflectivity and wide phase coverage over a broad bandwidth. For this purpose, a zero‐contrast dielectric metasurface consisting of a graded pattern of c‐Si nanodisks connected by a thin matched sublayer on top of a thin silica layer, featuring an average areal mass density of 0.54 g m⁻² is used. The nanostructured silicon layer is mainly responsible for efficient acceleration and self‐stabilization of beam‐riding while the thin silica layer enhances the thermal emissivity to preserve the integrity of meta‐sail under intense illumination power via radiative cooling. The role of phase gradient, nanocraft center of mass, Doppler shift, and chromatic dispersion on the interplay between stability and acceleration of the meta‐sail is identified. Moreover, motion trajectory and local steady‐state temperature of the meta‐sail during acceleration are estimated.

中文翻译：

光子超表面作为相对论光帆，用于多普勒稳定光束骑行和辐射冷却

在这项工作中，展示了具有平坦宏观几何形状的全介电光子超表面，为实现相对论光帆提供了可行的解决方案，该相对帆是由大功率激光器的辐射压力驱动的，提供无源光束穿越稳定性，有效的加速度和辐射演示冷却。解决的一个关键挑战是在多普勒扩展的推进带上保持加速度和稳定性，这对于实现相对论速度至关重要，并且要求超颖表面在宽带宽上保持高反射率和宽相位覆盖率。为此，形成了一个零对比度介电超表面，该介电超表面由c-Si纳米盘的渐变图案组成，该图案由薄的二氧化硅层顶部的匹配的子层连接，平均面质量密度为0.54 gm^使用-2。纳米结构的硅层主要负责光束的有效加速和自稳定，而二氧化硅薄层则通过辐射冷却增强了热发射率，从而在强照明功率下保持了前帆的完整性。确定了相位梯度，纳米飞行器质心，多普勒频移和色散对后帆稳定性和加速度之间相互作用的作用。此外，估计了加速过程中后帆的运动轨迹和局部稳态温度。

更新日期：2020-07-08

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