Robert B. Leighton coauthored The Feynman Lectures on Physics, Volume I by Richard Feynman and others with Richard Feynman and Matthew Sands. Its radiation treatment connects the motion of a electric charge with a transverse electromagnetic field observed far away. The component of acceleration perpendicular to the viewing direction determines the angular pattern in the nonrelativistic example. This links an observable light pattern to source motion, rather than introducing radiation only as a formula for total power.^[ref]

A physicist and author of teaching texts on classical mechanics, electromagnetism, quantum mechanics and statistical mechanics. His treatment of dispersive waves gives a useful example of the texts’ approach: a wave packet is built by adding sinusoidal waves, then expanding its dispersion relation to distinguish group velocity from phase velocity. This explains why the envelope of a water-wave packet can travel at a different speed from its crests.^[ref]

Matthew Sands coauthored The Feynman Lectures on Physics, Volume I by Richard Feynman and others with Richard Feynman and Robert B. Leighton. Their account of refractive index derives the delayed phase of light in matter from the superposition of incident light and radiation driven from electric charges. The oscillation frequency remains fixed at an interface, while phase velocity and wavelength change. This gives a microscopic explanation of refraction without imagining that the whole field simply stops at each atom.^[ref]

A researcher in experimental physics education who, with Cecilia Stari, Cecilia Cabeza and Arturo C. Martí, studied a physical pendulum with a movable suspension point. The experiment compared smartphone and photogate measurements of its period with predictions using the parallel axis theorem.^[ref]

A researcher who, with Wesley P. Wong, analyzed the effect of motion blur on optical tweezers measurements. A camera records a time average of a bead’s position during each exposure; fast Brownian motion is therefore partially hidden. Their correction recovers the spring constant and diffusion coefficient, and was checked using both simulated trajectories and a trapped-bead experiment. This is a systematic measurement effect, so collecting more images alone does not remove it.^[ref]

A researcher in biophysics who studies how kinesin and other molecular machines generate forces and organize the cytoskeleton. Measurements on individual molecules help connect their mechanical action with cell movement and shape.^[ref]

He also coauthored a 2006 optical tweezers calibration study, providing quantitative position and force scales for such measurements.^[ref]

A physicist and educator whose work includes undergraduate research in space physics and the joint authorship of University Physics Volume 1 by William Moebs and others. The text connects geometrical and component descriptions of vectors, so students can translate a diagram of motion or forces into equations without confusing a quantity with one particular coordinate representation.^[ref]

A researcher in optical tweezers and lead author of a 2020 tutorial on their calibration and applications. The tutorial explains how to turn trapped-particle fluctuations into quantitative measurements of forces, and compares trapping in liquids with trapping in vacuum, where much weaker damping changes the dynamics. Applications range from mechanical measurements on individual molecules to tests of statistical physics.^[ref]

A researcher who coauthored the 2006 optical tweezers calibration method. Combining a bead’s thermal motion with its response to driven stage motion determines position and force scales without requiring an independently known drag coefficient.^[ref]

Frank Jülicher coauthored a calibration method for optical tweezers that combines the trapped particle's thermal fluctuations with its response to a controlled sinusoidal motion. These two measurements determine position and force scales without taking the particle's drag coefficient as an independently known input. The experiment tested the method both near and far from surfaces. Its physical advantage is to separate detector calibration from uncertain particle size, viscosity and wall-dependent drag.^[ref]

A physicist working on biological imaging and optical manipulation. His LENS research includes spectroscopy and imaging of biological tissue, linking the development of optical instruments to measurements of living systems.^[ref]

He coauthored the 2006 calibration study of optical tweezers, testing how a known stage motion can provide an absolute scale for a bead-position signal.^[ref]

A researcher in biophysics who develops optical tweezers to measure how molecular machines, including kinesin, generate forces. Such experiments connect motion at the scale of individual molecules to the mechanical behavior of cells.^[ref]

He coauthored a calibration method combining thermal motion with a known oscillation of the sample stage, allowing the trap to measure forces without assuming the bead size or fluid viscosity.^[ref]

David Tong's electromagnetism lectures connect macroscopic fields with the response of matter. Their treatment of Thomas-Fermi screening derives how an electron gas rearranges around an electric potential and relates the screening length to the electronic density of states. Comparing this local approximation with Friedel oscillations shows why a useful long-wavelength theory need not reproduce the far-field oscillatory response. The example makes the assumptions behind an effective material model physically explicit.^[ref]

A coauthor of the 2019 physical pendulum study with Martín Monteiro, Cecilia Cabeza and Arturo C. Martí. Moving the support changes both the restoring torque and the moment of inertia, giving students a measurable test of how mass distribution controls a period.^[ref]

A coauthor with Martín Monteiro, Cecilia Stari and Arturo C. Martí of a 2019 experiment on a physical pendulum. Their apparatus uses a smartphone as part of the oscillating system as well as a measuring device, so the phone’s contribution to the moment of inertia enters the prediction.^[ref]

A researcher who coauthored the 2019 variable-support physical pendulum experiment with Martín Monteiro, Cecilia Stari and Cecilia Cabeza. Comparing several ways to measure the same period makes the experiment a practical check of both rigid-body dynamics and measurement consistency.^[ref]

A researcher and teacher in ocean hydrodynamics whose water-wave notes derive how water depth and wavelength control wave propagation. Comparing phase velocity with group velocity explains why an individual crest and a wave packet can move at different speeds. The calculation connects boundary conditions at the seabed and free surface with observable wave motion, and distinguishes the shallow-water and deep-water limits.^[ref]

Joseph von Fraunhofer combined precision manufacture of optical glass with quantitative spectroscopy. He systematically mapped dark lines in the solar spectrum and used them as reproducible reference points for comparing refraction in different glasses. His diffraction gratings supplied another way to separate and measure wavelengths. The Fraunhofer lines thus served an immediate engineering purpose before their later interpretation as signatures of absorbing matter: they let optical experiments return to the same identifiable spectral features.^[ref]

Richard Feynman formulated quantum mechanics as a sum over possible particle histories. In the path integral approach, each history contributes a probability amplitude with wave phase determined by its classical action, schematically $e^{iS/\hslash }$. Adding these probability amplitudes before taking their squared magnitude retains quantum interference. His 1948 paper establishes agreement with the Schrödinger equation, giving another formulation of the same theory and a powerful way to reorganize calculations.^[ref]