Light field

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

Unified Picture of Polariton Propagation in Bulk GaAs Semiconductors

Abstract: High-resolution amplitude and phase linear spectroscopy of high-quality bulk GaAs are reported. The detailed structure of the observed full complex transmission is consistently explained by polariton effects on the basis of microscopic calculations. The coupled equations for the excitonic polarization and the light field in the slab configuration are evaluated using appropriate boundary conditions for the electromagnetic field and the excitonic wave function without reference to additional boundary conditions for the macroscopic polarization. (c) 2000 The American Physical Society.

Light forces in two crossed standing waves with controlled time-phase difference.

Abstract: We have experimentally studied the interaction of a collimated thermal rubidium beam with a two-dimensional intense standing wave generated in the intersection area of the ${\mathrm{TEM}}_{00}$ modes of two mutually orthogonal linear optical resonators. The relative time-phase difference of the two resonator modes was controlled. We observe transverse confinement of the atoms in the node or antinode structure of the standing wave and a deflection of the atoms after their passage through the light field. In both cases the time-phase difference can be identified as an important parameter for the kinematics of the interaction process between atoms and standing waves. Our experimental data are in qualitative agreement with the results of a Monte Carlo simulation based on a two-level atom.

High-Resolution Light-Field Microscopy

Abstract: By combining a high-resolution image from a standard camera with a low-resolution wavefront measurement from a Shack-Hartmann sensor, we numerically reconstruct a high-resolution light field. We experimentally demonstrate the method with a commercially available microscope.

Coherent generation of EPR-entangled light pulses mediated by a single trapped atom

Abstract: We show that a single, trapped, laser-driven atom in a high-finesse optical cavity allows for the quantum-coherent generation of entangled light pulses on demand. We report the detailed description of schemes for generating simultaneous and temporally separated pulse pairs, presented in [G. Morigi et al., Phys. Rev. Lett., 96, 023601 (2006)]. The mechanical effect of the laser excitation on the quantum motion of the cold trapped atom mediates the entangling interaction between two cavity modes and between the two subsequent pulses, respectively. The entanglement is of EPR-type, and its degree can be controlled through external parameters. At the end of the generation process the atom is decorrelated from the light field. Possible experimental implementations of the proposals are discussed.

Snapshot Hyperspectral Light Field Imaging

Abstract: This paper presents the first snapshot hyperspectral light field imager in practice. Specifically, we design a novel hybrid camera system to obtain two complementary measurements that sample the angular and spectral dimensions respectively. To recover the full 5D hyperspectral light field from the severely undersampled measurements, we then propose an efficient computational reconstruction algorithm by exploiting the large correlations across the angular and spectral dimensions through self-learned dictionaries. Simulation on an elaborate hyperspectral light field dataset validates the effectiveness of the proposed approach. Hardware experimental results demonstrate that, for the first time to our knowledge, a 5D hyperspectral light field containing 9x9 angular views and 27 spectral bands can be acquired in a single shot.