Dispersive approach to photon-photon scattering

Imaging through scattering media finds applications in diverse fields from biomedicine to autonomous driving. However, interpreting the resulting images is difficult due to blur caused by the scattering of photons within the medium. Transient information, captured with fast temporal sensors, can be used to significantly improve the quality of images acquired in scattering conditions. Photon scattering, within a highly scattering media, is well modeled by the diffusion approximation of the Radiative Transport Equation (RTE). Its solution is easily derived which can be interpreted as a Spatio-Temporal Point Spread Function (STPSF). In this paper, we first discuss the properties of the ST-PSF and subsequently use this knowledge to simulate transient imaging through highly scattering media. We then propose a framework to invert the forward model, which assumes Poisson noise, to recover a noise-free, unblurred image by solving an optimization problem.

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Effects of Multiple Photon Scattering in Deciduous Tree Canopies

10.21236/ada518678 ◽

2009 ◽

Author(s):

Michael Greiner ◽

Bradley D. Duncan ◽

Matthew P. Dierking

Keyword(s):

Deciduous Tree ◽

Photon Scattering ◽

Tree Canopies

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Measurement of small-angle photon scattering for some breast tissues and tissue substitute materials

Physics in Medicine and Biology ◽

10.1088/0031-9155/36/1/002 ◽

1991 ◽

Vol 36 (1) ◽

pp. 7-18 ◽

Cited By ~ 82

Author(s):

S H Evans ◽

D A Bradley ◽

D R Dance ◽

J E Bateman ◽

C H Jones

Keyword(s):

Small Angle ◽

Photon Scattering ◽

Breast Tissues ◽

Substitute Materials

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Control of quantum electrodynamical processes by shaping electron wavepackets

Nature Communications ◽

10.1038/s41467-021-21367-1 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Liang Jie Wong ◽

Nicholas Rivera ◽

Chitraang Murdia ◽

Thomas Christensen ◽

John D. Joannopoulos ◽

...

Keyword(s):

Free Electron ◽

Spectral Characteristics ◽

Modern Science ◽

Optical Excitation ◽

Field Theories ◽

Photon Scattering ◽

Precise Control ◽

Bremsstrahlung Emission ◽

Superposition States ◽

Electron Photon

AbstractFundamental quantum electrodynamical (QED) processes, such as spontaneous emission and electron-photon scattering, encompass phenomena that underlie much of modern science and technology. Conventionally, calculations in QED and other field theories treat incoming particles as single-momentum states, omitting the possibility that coherent superposition states, i.e., shaped wavepackets, can alter fundamental scattering processes. Here, we show that free electron waveshaping can be used to design interferences between two or more pathways in a QED process, enabling precise control over the rate of that process. As an example, we show that free electron waveshaping modifies both spatial and spectral characteristics of bremsstrahlung emission, leading for instance to enhancements in directionality and monochromaticity. The ability to tailor general QED processes opens up additional avenues of control in phenomena ranging from optical excitation (e.g., plasmon and phonon emission) in electron microscopy to free electron lasing in the quantum regime.

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