Physical Optics & Wave Propagation

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Abstractions about electromagnetic and optical waves propagating, scattering, refracting, interfering, and coupling across systems. They include transmission and reflection models, polarization calculus, pupils and phase functions, heterodyne detection, interferometry, moiré effects, and radiative transitions.

21 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Afocal system — An optical system with zero net vergence and effectively infinite focal length, mapping collimated input rays to collimated output rays while changing angle or beam diameter.
• Backscattering cross section — An effective area quantifying the wave power an object returns toward the incident direction relative to incident intensity under a declared convention.
• Coupled mode theory — A reduced perturbative framework that represents interacting waves or resonators by slowly varying modal amplitudes linked through coupling coefficients.
• Discrete dipole approximation — A numerical electromagnetic-scattering method that replaces a target by interacting polarizable points and solves their self-consistent response to an incident field.
• Friis transmission equation — An ideal free-space relation linking received power to transmitted power, antenna gains, wavelength, and separation.
• Henyey–Greenstein phase function — A one-parameter angular scattering distribution whose asymmetry factor interpolates among backward isotropic and forward scattering.
• Huygens–Fresnel principle — A wave-propagation principle treating every point on a wavefront as a source of secondary wavelets whose phase-sensitive superposition forms the later field.
• Jones calculus — A two-component complex-vector and matrix formalism for transforming fully polarized coherent light through linear optical elements.
• Lorentz oscillator model — A classical model of bound charges as damped driven harmonic oscillators, producing frequency-dependent dielectric response, dispersion and resonant absorption.
• Moiré pattern — A large-scale beat or interference pattern produced by superposing similar periodic structures with a small mismatch in spacing, orientation, curvature, or sampling.
• Optical heterodyne detection — A coherent optical detection method that mixes a signal with a frequency-offset local oscillator so phase and frequency modulation appear as an electronically measurable beat signal.
• Physical optics — The treatment of optical propagation as waves so interference, diffraction and polarization are retained beyond geometric rays.
• Pupil function — A complex-valued aperture-plane function describing the amplitude transmission and phase shift imposed by an optical imaging system.
• Refraction — The change in direction and wavelength of a wave caused by a change in propagation speed across space or between media.
• Spectral phase interferometry for direct electric-field reconstruction — An ultrashort-pulse characterization technique that retrieves spectral phase from interference between two frequency-sheared replicas and combines it with the measured spectrum to reconstruct the electric field.
• Superradiant phase transition — A collective quantum phase transition from a weakly excited state to one with macroscopic coherent occupation of a radiation mode and correlated emitter polarization.
• Three-photon interference — Quantum interference among indistinguishable alternatives for three photons propagating through a multimode optical network.
• Total active reflection coefficient — The square root of total reflected power divided by total incident power across all ports of a simultaneously excited multiport network or antenna array.
• Transmittance — The fraction of incident radiant power that emerges through a material or optical system under specified wavelength, geometry and boundary conditions.
• Transparency and translucency — Optical transmission properties distinguished by scattering: transparent media preserve image-forming direction through the material, while translucent media transmit light but diffuse spatial detail.
• Two-ray ground-reflection model — A radio-propagation model that approximates received field as the coherent sum of one direct line-of-sight ray and one specular ground-reflected ray.