This paper presents results from the NASA ESTO funded ATLIS-P Advanced Technology Demonstration (ATD). The ATLIS-P ATD designed, built and tested a laboratory prototype land imager based on a free form reflective triplet telescope and production digital focal plane assembly (FPA). Results show this prototype system meets Landsat 8 Visible through Shortwave Infrared (VSWIR) requirements with much less size and mass than current land imaging systems. NASA ESTO funded this work through grants 80NSSC18K0103 and NNX16AP64G to Raytheon Company.
A switchable virtual reality (VR), augmented reality (AR), and mixed reality (MR) system is proposed using digital optical cloaking. Optical cloaking allows completely opaque VR devices to be cloaked," switching to AR or MR while providing correct three-dimensional (3D) parallax and perspective of the real world, without the need for transparent optics. On the other hand, 3D capture and display devices with non-zero thicknesses, require optical cloaking to properly display captured reality. A simplified stereoscopic system with two cameras and existing VR systems can be an approximation for limited VR, AR, or MR. To provide true 3D visual effects, multiple input cameras, a 3D display, and a simple linear calculation amounting to cloaking can be used. Since the display size requirements for VR, AR, and MR are usually small, with increasing computing power and pixel densities, the framework presented here can provide a widely deployable VR, AR, MR design.
We propose `digital cloaking' as a method for practical cloaking, where space, angle, spectrum, and phase are discretized. At the sacrifice of spatial resolution, a good approximation to an `ideal' cloak can be achieved- a cloak that is omnidirectional, broadband, operational for the visible spectrum, three- dimensional (3D), and phase-matching for the light field, among other attributes. Experimentally, we demonstrate a two-dimensional (2D), planar, ray optics version of our proposed digital cloak by using lenticular lenses, similar to `integral imaging' for 3D displays. With the continuing improvement in commercial digital technology, the resolution limitations of a digital cloak will be minimized, and a wearable cloak can be developed in the future.
Despite much interest and progress in optical spatial cloaking, a three-dimensional (3D), transmitting, continuously multidirectional cloak in the visible regime has not yet been demonstrated. Here we experimentally demonstrate such a cloak using ray optics, albeit with some edge effects. Our device requires no new materials, uses isotropic off-the-shelf optics, scales easily to cloak arbitrarily large objects, and is as broadband as the choice of optical material, all of which have been challenges for current cloaking schemes. In addition, we provide a concise formalism that quantifies and produces perfect optical cloaks in the small-angle (`paraxial') limit.
Conference Committee Involvement (9)
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