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Light field

About: Light field is a research topic. Over the lifetime, 5357 publications have been published within this topic receiving 87424 citations.


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TL;DR: In this article, the authors proposed a new type of spatially periodic structure, called polaritonic crystal (PolC), to observe a "slow"/"stopped" light phenomenon due to coupled atom-field states (polaritons) in a lattice.
Abstract: We propose a new type of spatially periodic structure, i.e. polaritonic crystal (PolC), to observe a "slow"/"stopped" light phenomenon due to coupled atom-field states (polaritons) in a lattice. Under the tightbinding approximation, such a system realizes an array of weakly coupled trapped two-component atomic ensembles interacting with optical field in a tunnel-coupled one dimensional cavity array. We have shown that the phase transition to the superfluid Bardeen-Cooper-Schrieffer state, a so-called (BCS)-type state of low branch polaritons, occurs under the strong coupling condition. Such a transition results in the appearance of a macroscopic polarization of the atomic medium at non-zero frequency. The principal result is that the group velocity of polaritons depends essentially on the order parameter of the system, i.e. on the average photon number in the cavity array.

26 citations

Journal ArticleDOI
TL;DR: In this article, a scheme for photon trapping in an optical resonator coupled with two-level atoms was proposed and analyzed, where the output light from the cavity is suppressed while the intracavity light field is near maximum due to the excitation of the polariton state of the coupled cavity and atom system.
Abstract: We propose and analyze a scheme for photon trapping in an optical resonator coupled with two-level atoms. We show that when the cavity is excited by two identical light fields, one from each end of the cavity, the output light from the cavity is suppressed while the intracavity light field is nearmaximum due to the excitation of the polariton state of the coupled cavity and atom system. We also present methods for the direct probing of the trapped polariton state. The photon trapping is manifested by the destructive interference of the transmitted light and the incident light, which is conditioned on the presence of incoherent processes such as spontaneous decay of the atomic excitation of the polariton state. Such photon trapping is quite generic and should be observable experimentally in a variety of cavity quantum electrodynamics systems.

26 citations

Journal ArticleDOI
TL;DR: More complicated and more realistic light fields are considered and extensive, highly structured, quantitative observations using novel paradigms are presented, mainly global top-down template matching of peripheral local data.
Abstract: From a theoretical point of view, the use of the shading cue involves estimates of the light field and thus observers need to judge the light field and the shape simultaneously. The conventional stimulus in perceptual experiments, a circular disk filled with a monotonic gradient on a uniform surround, represents a local shading or tonal gradient. In typical scenes, such gradients vary smoothly from point to point over large areas, whereas light fields are globally defined and tend to be invariant over large parts of the scene. Hence, it is hardly surprising that multi-local shape estimates tend to synchronize although previous reports of such synchronies involved uniform, homogeneous light fields. Here, we consider more complicated and more realistic light fields. We present extensive, highly structured, quantitative observations using novel paradigms. Human observers are able to deal with some structured light fields but totally fail in others, even though these may be formally similar (like radial and circular fields). Observers respond very differently in some cases where the light fields differ only by sign, like converging and diverging fields. These results can be qualitatively understood on the basis of a few simple assumptions, mainly global top-down template matching of peripheral local data.

26 citations

Journal ArticleDOI
TL;DR: This Letter proposes a solution to the above issue by introducing a new method to fabricate holographic concave micro-mirror array sheets and explains how they work in detail.
Abstract: Concave micro-mirror arrays fabricated as holographic optical elements are used in projector-based light field displays due to their see-through characteristics. The optical axes of each micro-mirror in the array are usually made parallel to each other, which simplifies the fabrication, integral image rendering, and calibration process. However, this demands that the beam from the projector be collimated and made parallel to the optical axis of each elemental micro-mirror. This requires additional collimation optics, which puts serious limitations on the size of the display. In this Letter, we propose a solution to the above issue by introducing a new method to fabricate holographic concave micro-mirror array sheets and explain how they work in detail. 3D light field reconstructions of the size 20 cm×10 cm and 6 cm in depth are achieved using a conventional projector without any collimation optics.

26 citations

Journal ArticleDOI
TL;DR: This study deeply analyze several factors that associate the configuration of the target light field with the quality of the displayed images, and derives a quantitative requirement on the configuration: the disparities among the adjacent viewpoints should be limited to 0-1 pixels.
Abstract: To provide realistic 3-D perception to human observers, 3-D displays have evolved to present not only a pair of stereo images but also many images to different viewing directions. A light-field display, which consists of a few light-attenuating pixelized layers (e.g., LCD panels) stacked in front of a backlight, has attracted attention because of its potential to simultaneously support many viewing directions with high quality. The transmittances of the layers are determined from a set of multiview images or a light field that is given to represent observations expected from many viewing directions. However, the relation between the configuration of the given light field and the quality of displayed images has not sufficiently been discussed in previous works. In this study, in our aim to display real-world objects with high quality, we address the requirement for the target light field given as the input. We deeply analyze several factors that associate the configuration of the target light field with the quality of the displayed images, and we derive a quantitative requirement on the configuration: The disparities among the adjacent viewpoints should be limited to 0–1 pixels. To meet this strict requirement with real-world objects, we propose using a multiview camera and image-based rendering, where we can generate virtual light fields with arbitrary configurations and densities. Our theory and method are verified by experiments using a computer-simulated display.

26 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023135
2022375
2021274
2020493
2019555
2018503