论文标题
通过螺旋形二耦MetaSurface以完整的极化通道调整独立的波前调整
Independent wavefront tailoring in full polarization channels by helicity-decoupled metasurface
论文作者
论文摘要
控制光的极化和波前对于现代科学和技术中的紧凑光子系统至关重要。这可以通过Metasurfaces来实现,Metasurfaces是一个新的平台,它从根本上改变了人们工程师的波浪交互方式。但是,通过单个超薄元表面在每个极化通道中生成具有任意和独立波前的多功能光束仍然非常具有挑战性。通过调节跨面的几何和传播阶段,在这里,我们提出了一种可以生成圆形和线性偏振光束组装的方法,同时又具有独立编码的所需波前的能力,可以极大地增强元数据的信息能力。在微波区域实验证明了两种概念验证设计。激发任意线性极化后,第一个设备可以使用所需的两个线性和两个圆形正交极化产生不同的涡旋束,而第二个则可以生成一个包含完整极化的组件。这种使用量身定制的波前产生多功能极化的方法可能铺平了一种为集成系统实现高级,扁平和多功能的元设备的方法。
Controlling the polarization and wavefront of light is essential for compact photonic systems in modern science and technology. This may be achieved by metasurfaces, a new platform that has radically changed the way people engineer wave-matter interactions. However, it still remains very challenging to generate versatile beams with arbitrary and independent wavefronts in each polarization channel by a single ultrathin metasurface. By modulating both the geometric and propagation phases of the metasurface, here we propose a method that can generate an assembly of circularly- and linearly-polarized beams with simultaneously the capability of independent encoding desired wavefront to each individual polarization channel, which we believe will greatly enhance the information capacities of the meta-devices. Two proof-of-concept designs are experimentally demonstrated in microwave region. Upon the excitation of an arbitrary linear polarization, the first device can generate distinct vortex beams with desired two linear and two circular orthogonal polarizations, whereas the second one can generate multi-foci containing components of full polarizations. This approach to generate versatile polarizations with tailored wavefront may pave a way to achieve advanced, flat and multifunctional meta-device for integrated systems.