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Flat metaform near-eye visor

机译:扁平状态近眼遮阳板

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摘要

A near-eye visor is one of the most vital components in a head-mounteddisplay. Currently, freeform optics and waveguides are used to design near-eyevisors, but these structures are complex and their field of view is limitedwhen the visor is placed near the eye. In this paper, we propose a flat,freeform near-eye visor which uses a sub-wavelength patterned metasurfacereflector. The visor design imparts a spatial phase profile on a projecteddisplay pattern and can be implemented using a micron-scale thick metasurface.As the resulting metaform visor relies on diffraction, it can preserve a largefield of view (77.3{\deg} both horizontally and vertically) when placed only2.5 cm away from the eye. We simulate the metasurface visor to estimate themodulation transfer function, and find that the projected image quality issufficiently high for human vision. While the design of the metasurface isinitially performed via ray optics, using full-wave finite-differencetime-domain simulation we validate a scaled version of our visor design.
机译:近眼遮阳板是头戴式显示器中最重要的组件之一。当前,自由形式的光学器件和波导用于设计近视镜,但是这些结构很复杂,并且当将视镜放在眼睛附近时它们的视野受到限制。在本文中,我们提出了一种扁平的,自由形式的近眼面罩,该面罩使用亚波长图案化的超表面反射镜。遮阳板设计可在投影的显示图案上赋予空间相位轮廓,可使用微米级厚的超颖表面来实现。由于形成的变形玻璃板依靠衍射,因此可以在水平和垂直方向上保留较大的视野(77.3 {\ deg} )放在距离眼睛仅2.5厘米处。我们模拟了超表面面罩,以估计调制传递函数,并发现投影图像质量对于人类视觉来说足够高。虽然超表面的设计最初是通过射线光学系统执行的,但使用全波有限差分时域仿真,我们可以验证遮阳板设计的缩放比例。

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