We first discuss the ultimate specifications of an augmented reality display that would saturate the human perception. Thereafter our study identifies fundamental limitations and trade-offs enforced by laws of optics for any augmented reality display that uses passive optical elements such as visors, waveguides, and meta-surfaces to deliver the image to the eye. The limitations are categorized into 7 rules that optics designers must consider when they are designing augmented reality glasses. These rules are directly drawn from Fermat's principle, perturbation theory, linear optics reciprocity, and human visual perception principles. Based on psychophysical theories we further work toward defining and quantizing levels of depth that would saturate the human depth perception. Our results indicate that passive optics acts as a passive system with less than unity pulse response function that would always reduce the performance of the original light source. Additionally, our investigations reveal the dynamics between allocation of depth levels and number of depth levels for ultimate lighfield experiences.
Ultrafast imaging has been a key enabler to many novel imaging modalities, including looking behind corners and imaging behind scattering layers. With picosecond time resolution and unconventional sensing geometries, ultrafast imaging can fundamentally impact sensing capabilities in industrial and biomedical applications. This paper reviews the fundamentals, recent advances, and the future prospects of ultrafast imaging-based modalities.
We take advantage of human hair specific geometry to visualize sparse submicron cuticle peelings with highly oblique tip-side illumination. We show that the statistics of these features can directly estimate hair quality in much lower magnifications (down to 20x) with less powerful objectives when the features themselves are below the system resolution. Our technique has strong potential for lower cost, portable, and autonomous hair diagnostic apparatuses.
In this paper, we review recent progress towards efficient and versatile waveguides and
transmission lines for terahertz applications. Terahertz waveguides are compared in terms of loss
and coupling efficiency. Different loss mechanisms and fundamental limits are treated. We also
propose a slot-line structure suitable for terahertz frequencies.
Conference Committee Involvement (3)
AI and Optical Data Sciences III
24 January 2022 | San Francisco, California, United States
AI and Optical Data Sciences II
6 March 2021 | Online Only, California, United States
AI and Optical Data Sciences
4 February 2020 | San Francisco, California, United States
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