Light field

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

Optical signal and display device

Abstract: The arrangement has a rastered light field with a matrix of grouped light sources controllable individually, in groups or as a whole, esp. LEDs (14), on a printed board (10) and a lens system with a spatially defined light distribution. The lens system contains at least one scattering lens (12) extending over the entire light field and of externally flat profile and with internal parallel grooves (18) with at least partially asymmetrically curved surfaces (26). The plane region is slightly angled between the grooves. An Independent claim is also included for a method of monitoring the light intensity of the arrangement.

Inhibition of tunneling in optical bistability by a squeezed vacuum.

Abstract: Squeezed states of light, which demonstrate the essentially quantum nature of the light field, were recently produced in the laboratory. We present an application of squeezed light to stability enhancement of optically bistable systems.1 Such systems may exist either of two macroscopic metastable states. Quantum fluctuations induce tunneling between these states thus determining their ultimate stability.

Unconventional control of excited states of a dimer molecule by a localized light field between metal nanostructures

Abstract: We have made a theoretical study of the spatial interplay between the localized light field (LLF) and the electronic wave-function of molecules. When the LLF has a nanoscale spatial variation comparable to a molecular wavefunction, this interplay is crucial to determine the optical response of molecular excited states. Such a condition can be realized in case that a molecule is lying in the vicinity of a metal nanogap. By using the calculation method applicable to arbitrary-shaped samples, we demonstrate a drastic enhancement of the response electromagnetic field from an optical forbidden state whose magnitude is comparable to that from an allowed state. The obtained result indicates that we have a possibility to control the excited states of molecules by designing the LLF with metal nanostructures.

Strongly localized polaritons in an array of trapped two-level atoms interacting with a light field

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 tight-binding approximation, such a system realizes an array of weakly coupled trapped two-component atomic ensembles interacting with the 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.

The Wavelet Stream – Progressive Transmission of Compressed Light Field Data

Abstract: In this paper we describe the compression of light field data using 4D nonstandard wavelet decomposition. For progressive transmission, storage, and rendering of the compressed light field data the new wavelet stream data structure is introduced. The wavelet coefficients are ordered in decreasing importance, encoding the position of the non discarded coefficients using significance maps. Compared to the vector quantization compression method, the wavelet stream achieves up to 3 times higher compression ratios while producing the same error during reconstruction of the light field data. Despite of the high compression of the data, reasonable frame rates during light field rendering are achieved. CR Categories: I.3.6 [Computer Graphics]: Methodology and Techniques—Graphics data structures and data types E.4 [Coding and Information Theory]: Data compaction and compression