近两年light上关于AR的几篇文章

小吉炖蘑菇

主要是前沿综述，给想要研究了解的朋友作为参考。第一次发帖，若有不当之处还请批评指正。

1.Holographic optics in planar optical systems for next generation small form factor mixed reality headsets.URL：http://doi.org/10.37188/lam.2022.042
本文回顾了过去 10 年发展起来的各种光学技术和架构，以提供足够的解决方案来满足消费级 HMD 的巨大市场需求。
Abstract：Helmet Mounted Displays (HMDs), such as in Virtual Reality (VR), Augmented Reality (AR), Mixed reality (MR), and Smart Glasses have the potential to revolutionize the way we live our private and professional lives, as in communicating,working, teaching and learning, shopping and getting entertained.Such HMD devices have to satisfy draconian requirements in weight, size, form factor, power, compute, wireless communication and of course display, imaging and sensing performances.We review in this paper the various optical technologies and architectures that have been developed in the past 10 years to provide adequate solutions for the drastic requirements of consumer HMDs, a market that has yet to become mature in the next years, unlike the existing enterprise anddefense markets that have already adopted VR and AR headsets as practical tools to improve greatly effectiveness and productivity.
We focus specifically our attention on the optical combiner element, a crucial element in Optical See-Through (OST) HMDs that combines the see-through scene with a world locked digital image.As for the technological platform, we chose optical waveguide combiners, although there is also a considerable effort today dedicated to free-space combiners.Flat and thin optics as in micro-optics, holographics, diffractives, metasurfaces and other nanostructured optical elements are key building blocks to achieve the target form factor.
2.Advanced liquid crystal devices for augmented reality and virtual reality displays: principles and applications.
URL：https://doi.org/10.1038/s41377-022-00851-3介绍了用于 VR 的微型液晶显示器、用于 AR/VR 光引擎和全息成像的高分辨率密度、高亮度的硅基液晶 （LCoS），以及接近 100% 光效率的超薄液晶光学器件，这三大类新型液晶器件涵盖了从光引擎、光学成像、光学补偿等各种功能组件，为整个AR/VR系统的小型化和高品质图像带来新的曙光。
Abstract：Liquid crystal displays (LCDs) and photonic devices play a pivotal role to augmented reality (AR) and virtual reality (VR). The recently emerging high-dynamic-range (HDR) mini-LED backlit LCDs significantly boost the image quality and brightness and reduce the power consumption for VR displays. Such a light engine is particularly attractive for compensating the optical loss of pancake structure to achieve compact and lightweight VR headsets. On the other hand, high-resolution-density, and high-brightness liquid-crystal-on-silicon (LCoS) is a promising image source for the see-through AR displays, especially under high ambient lighting conditions. Meanwhile, the high-speed LCoS spatial light modulators open a new door for holographic displays and focal surface displays. Finally, the ultrathin planar diffractive LC optical elements, such as geometric phase LC grating and lens, have found useful applications in AR and VR for enhancing resolution, widening field-of-view, suppressing chromatic aberrations, creating multiplanes to overcome the vergence-accommodation conflict, and dynamic pupil steering to achieve gaze-matched Maxwellian displays, just to name a few. The operation principles, potential applications, and future challenges of these advanced LC devices will be discussed.

3.Holographic augmented reality display with conical holographic optical element for wide viewing zone
URL：https://doi.org/10.37188/lam.2022.012
论文主要分为四部分内容：锥形 HOE 的光学性能研究、基于锥形 HOE 的大视场全息 AR 显示原理和实验、锥形 HOE 的制作以及基于费马原理的全息图计算方法。
Abstract：In this study, we propose a holographic augmented reality (AR) display with a wide viewing zone realized by using a special-designed reflective optical element.A conical holographic optical element (HOE) is used as such a reflective optical element.This conical HOE was implemented to reconstruct a diverging spherical wave with a wide spread angle.It has a sharp wavelength selectivity by recording it as a volume hologram, enabling augmented reality (AR) representation of real and virtual 3D objects.The quality of the generated spherical wave and the spectral reflectivity of the fabricated conical HOE were investigated.An optical superimposition between real and virtual 3D objects was demonstrated, thereby enhancing the validity of our proposed method.A horizontal viewing zone of 140° and a vertical viewing zone of 30° were experimentally confirmed.The fabrication procedure for the conical HOE is presented, and the calculation method of the computer-generated hologram (CGH) based on Fermat’s principle is explained in detail.

4.Holographic techniques for augmented reality and virtual reality near-eye displaysURL：https://doi.org/10.37188/lam.2022.009
研究人员主要说明了目前的两种重要全息设备对 NED 的技术支撑，分别为静态全息光学元件和动态全息显示设备。还讨论了当前的问题和最新进展，从而全面回顾了全息技术在 AR / VR NED应用中的研究前景。
Abstract：Near-eye displays are the main platform devices for many augmented reality (AR) and virtual reality (VR) applications.As a wearable device, a near-eye display should have a compact form factor and be lightweight.Furthermore, a large field of view and sufficient eyebox are crucial for immersive viewing conditions.Natural three- dimensional (3D) image presentation with proper focus cues is another requirement that enables a comfortable viewing experience and natural user interaction.Finally, in the case of AR, the device should allow for an optical see-through view of the real world.Conventional bulk optics and two-dimensional display panels exhibit clear limitations when implementing these requirements.Holographic techniques have been applied to near-eye displays in various aspects to overcome the limitations of conventional optics.The wavefront reconstruction capability of holographic techniques has been extensively exploited to develop optical see-through 3D holographic near-eye displays of glass-like form factors.In this article, the application of holographic techniques to AR and VR near-eye displays is reviewed.Various applications are introduced, such as static holographic optical components and dynamic holographic display devices.Current issues and recent progress are also reviewed, providing a comprehensive overview of holographic techniques that are applied to AR and VR near-eye displays.

5.Augmented reality and virtual reality displays: emerging technologies and future perspectives
本文介绍了AR和VR耳机的基本结构，讨论了各个结构的光学器件的特点以及如何帮助增强 AR 和 VR 性能，并详细描述和分析了一些状态最先进的架构。
Abstract：With rapid advances in high-speed communication and computation, augmented reality (AR) and virtual reality (VR) are emerging as next-generation display platforms for deeper human-digital interactions.Nonetheless, to simultaneously match the exceptional performance of human vision and keep the near-eye display module compact and lightweight imposes unprecedented challenges on optical engineering.Fortunately, recent progress in holographic optical elements (HOEs) and lithography-enabled devices provide innovative ways to tackle these obstacles in AR and VR that are otherwise difficult with traditional optics.In this review, we begin with introducing the basic structures of AR and VR headsets, and then describing the operation principles of various HOEs and lithography- enabled devices.Their properties are analyzed in detail, including strong selectivity on wavelength and incident angle, and multiplexing ability of volume HOEs, polarization dependency and active switching of liquid crystal HOEs, device fabrication, and properties of micro-LEDs (light-emitting diodes), andlarge design freedoms of metasurfaces.Afterwards, we discuss how these devices help enhance the AR and VR performance, with detailed description and analysis of some state-of-the-art architectures.Finally, we cast a perspective on potential developments and research directions of these photonic devices for future AR and VR displays.

6.Electrically driven mid-submicrometre pixelation of InGaN micro-light-emitting diode displays for augmented-reality glasses
https://doi.org/10.1038/s41566-021-00783-1
这篇主要介绍定制离子注入像素化方案制作微显示器的方法，可作为拓展内容了解。文中称 “我们预计所展示的方法将为实现无缝AR眼镜的高性能 μLED 显示器铺平道路”。
Abstract：InGaN-based blue light-emitting diodes (LEDs), with their high efficiency and brightness, are entering the display industry.However, a significant gap remains between the expectation of highly efficient light sources and their experimental realization into tiny pixels for ultrahigh-density displays for augmented reality.Herein, we report using tailored ion implantation (TIIP) to fabricate highly efficient, electrically-driven pixelated InGaN micro-LEDs (μLEDs) at the mid-submicrometre scale (line/ space of 0.5/0.5 μm), corresponding to 8,500 pixels per inch(ppi) (RGB).Creating a laterally confined non-radiative region around each pixel with a controlled amount of mobile vacancies, TIIP pixelation produces relatively invariant luminance, and high pixel distinctiveness, at submicrometre-sized pixels.Moreover, with the incomparable integration capability of TIIP pix- elation due to its planar geometry, we demonstrate 2,000 ppi μLED displays with monolithically integrated thin-film transistor pixel circuits, and 5,000 ppi compatible core technologies.We expect that the demonstrated method will pave the way toward high-performance μLED displays for seamless augmented-reality glasses.

还有一篇似乎有朋友发过了就不重复了。