How light interacts with matter, revisited
Abstract
In 1968 Victor Weisskopf explained in Scientific American how light interacts with matter, with a few formulas and many words. We tell the same story again with the tools that have since become available: the fields are computed and drawn, and their evolution in time is shown in animations. Light is described as a classical electromagnetic field and matter as a collection of charged oscillators; every phenomenon follows from adding up the retarded waves radiated by the oscillators, each with its proper delay and phase. From this single picture we obtain the blue of the sky and the white of the clouds, transparency and the refractive index, the Ewald-Oseen extinction theorem, reflection and the colours of thin films, why metals reflect and what gives metals and semiconductors their colours, polarizers, Brewster's angle and birefringence, the working of mirrors, lenses, microscopes and the eye, the propagation of a few-cycle pulse through a slab, Cherenkov radiation, amplification and second-harmonic generation. Feynman's arrows are made quantitative with the sheet method, and coupled-dipole simulations show the incident wave being cancelled and replaced inside the medium. The connection with quantum theory is discussed where the classical picture stops: the photon, spontaneous emission and the forbidden lines of the aurora, vision and photosynthesis, and the sum over paths. The text is addressed to undergraduate students and their teachers, and to any reader curious about the physics behind everyday optical phenomena; derivations are collected in separate panels, and the animations and the Python codes used for the figures and simulations are provided as ancillary files.
Related
- Light-matter interaction between templated molecular layers and surface lattice resonances
- Multimode equilibrium approximations in light-matter systems from weak to strong coupling
- Sub-cycle switch-on of ultrastrong light–matter interaction
- Unified light-matter metric of molecular and nanophotonic chirality
- Attainable and unattainable quantum precision limits in ultrastrong light--matter coupling
BibTeX
@misc{reali2026light,
title = {{How light interacts with matter, revisited}},
author = {Giancarlo Reali},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.10171},
eprint = {2611.10171},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.10171},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - How light interacts with matter, revisited
AU - Giancarlo Reali
PY - 2026
DA - 2026/11/06
PB - arXiv
DO - 10.48550/arxiv.2611.10171
UR - https://arxiv.org/abs/2611.10171
AB - In 1968 Victor Weisskopf explained in Scientific American how light interacts with matter, with a few formulas and many words. We tell the same story again with the tools that have since become available: the fields are computed and drawn, and their evolution in time is shown in animations. Light is described as a classical electromagnetic field and matter as a collection of charged oscillators; every phenomenon follows from adding up the retarded waves radiated by the oscillators, each with its proper delay and phase. From this single picture we obtain the blue of the sky and the white of the clouds, transparency and the refractive index, the Ewald-Oseen extinction theorem, reflection and the colours of thin films, why metals reflect and what gives metals and semiconductors their colours, polarizers, Brewster's angle and birefringence, the working of mirrors, lenses, microscopes and the eye, the propagation of a few-cycle pulse through a slab, Cherenkov radiation, amplification and second-harmonic generation. Feynman's arrows are made quantitative with the sheet method, and coupled-dipole simulations show the incident wave being cancelled and replaced inside the medium. The connection with quantum theory is discussed where the classical picture stops: the photon, spontaneous emission and the forbidden lines of the aurora, vision and photosynthesis, and the sum over paths. The text is addressed to undergraduate students and their teachers, and to any reader curious about the physics behind everyday optical phenomena; derivations are collected in separate panels, and the animations and the Python codes used for the figures and simulations are provided as ancillary files.
ER -