将SIN的光子学和METASURFACE到AUTOTUNE AR眼镜
Unlike AR glasses that rely on diffraction gratings and built-in light guides to shine an image at the wearer’s eyes (from an integrated light engine or microdisplay), the researchers plan to combine SiN photonics (for the control part) with flat optics (made from purposely nanostructured thin films also known as metasurfaces).
据报道，如多年前的平面光学器件在标题下的“平面光学器件”下，通过纳米级各向异性光散射散，能够通过引入光学响应的空间变化来将光学波线形状成形为任意形状。光散射仪。
对于这些平面光学器件，研究人员具有工程化的光学材料（enmats），其包括新的相转移相关氧化物和2D激发器过渡金属二甲基化物（TMDS）。这些恩白将具有极高的电光响应与可见（VI）和近红外（NIR）的极低损耗相结合。这是氮化硅（SIN）集成光子的情况下，证明在VIAR和NIR光谱范围内操作。
Silicon Nitride integrated photonics with EnMats flat optics.
AR玻璃由2D像素数组组成，
waveguide-coupled RGB and NIR lasers, a NIR detector,
a NIR isolator, electronic circuits and control software.
新颖的AR玻璃将依赖于像素尺寸的可调谐元件，以在VI和NIR中产生超快任意波前，并使用具有它们的高度可调复杂的光学折射率的enmats与SIN光学谐振器相结合，以进一步提高恩式的电光效应。
In a possible implementation, the AR glass would consists of a 2D array of pixels based on VIS and NIR electrically tunable SiN resonators coated with thin-film EnMats. Each metasurface pixel would be receiving red-green-blue and NIR light from waveguide-coupled on-board RGB and NIR lasers. The electrically tunable SiN resonators would allow each pixel to be individually tuned for projecting the image) but would also double as an NIR optical phased arrays for characterizing ocular aberrations. The AR glass would also feature one optical isolator to distinguish between NIR light projected into the eye and the NIR light reflected from the retina, enabling simultaneous light projection and detection in the NIR.
“我们将激光将激光耦合到公交车道上，将其分布在覆盖AR玻璃的整个表面的分支波导，将其耦合到初始谐振器中，然后将其分散到眼睛中，”尤金解释说明HIGGINS哥伦比亚电气工程教授，他领导了这项研究。
The scattered NIR light would then be detected to dynamically characterize ocular aberrations of the wearer’s eye and then apply pixel-level corrections through the tunable EnMats, directly to the image being projected at the retina. This means the projected image would always appear crystal clear, regardless of the wearer.
“The multi-functionality of our nanostructured AR glass is enabled by extreme capabilities that cannot be achieved using traditional optical elements,” is quoted Lipson on the Columbia University web page.
“Our system incorporates the capabilities of wavefront sensing and correction for lower and higher order ocular aberrations in real time, capabilities that no other display technology provides and that have been shown to be critical for clear or even ‘supernormal’ vision of images.”
The team also plans to develop a scalable fabrication process based on standard CMOS techniques and dry transfer processes to integrate the EnMats into the SiN integrated photonics platform. Part of their research will consist in developing the analytical and computational tools for modeling large resonator arrays and device performance dynamics.
Columbia Engineering –http://engineering.columbia.edu
