A researcher and teacher in fluid mechanics whose cylinder-flow experiment connects surface-pressure measurements with aerodynamic drag. The apparatus places a cylinder in a wind tunnel, uses a Pitot-static tube to characterize the incoming flow, and connects surface pressure tappings to pressure-measuring instruments. Comparing measured pressures around the cylinder with ideal-flow predictions exposes the importance of the boundary layer and separated wake. The exercise links instrument readings to the failure of an otherwise elegant flow model.^[ref]

Hugo Touchette develops connections between the large deviation principle and statistical mechanics. Rare fluctuations often have probabilities that decrease exponentially with system size or observation time; their rate function captures information beyond a local Gaussian approximation. His treatment uses this structure to derive variational descriptions of equilibrium and nonequilibrium states. Nonconcave entropies expose limits of ordinary Legendre transforms and help explain why different statistical ensembles need not be equivalent.^[ref]

A researcher in quantum optics who coauthored the 2016 analysis of two-source optical resolution with Mankei Tsang and Ranjith Nair. Their analysis connects measurement design to the precision of separation estimates, explaining why overlapping images need not imply indistinguishable source positions.^[ref]

A researcher in quantum optics, and coauthor with Mankei Tsang and Xiao-Ming Lu of a 2016 theory of resolving two incoherent light sources. Their result concerns estimating a separation even when the intensity images overlap: changing the optical measurement can preserve precision that ordinary imaging loses. Possible applications include distinguishing nearby stars.^[ref]

A physicist working on quantum optics and the limits of optical resolution. With Ranjith Nair and Xiao-Ming Lu, he showed that the difficulty of estimating the separation of two nearby, mutually incoherent sources depends on the measurement: suitable linear optics and photon counting retain information lost by ordinary imaging. This makes the Rayleigh criterion a limitation of a particular imaging method rather than a universal precision bound.^[ref]

A researcher and microscopy educator whose tutorials explain how optical design limits the detail visible in a microscope. His account of numerical aperture connects the light-collection cone and the immersion medium’s refractive index with the objective’s ability to capture diffracted light. This makes clear why greater magnification alone need not reveal more structure: an objective must collect the angular components carrying that structure before a larger image can show it.^[ref]

A researcher whose joint microscopy work investigated recovering the optical point spread function from images of finite fluorescent beads. The study evaluates deconvolution as a correction for bead size, while also testing a deliberately modified response with nearby peaks. The calibration object and the optical model must therefore be analyzed together.^[ref]

A researcher whose team examined the use of fluorescent microspheres as optical calibration objects. Their confocal-microscopy study shows how the marker’s finite size changes the measured point spread function, linking the physical test object with the apparent resolving performance of the instrument.^[ref]

A researcher whose joint work tests point spread function measurements using fluorescent beads. A bead image represents the convolution of the object with the microscope response. Comparing different bead sizes helps determine when the particle is small enough to serve as a useful approximation to a point source.^[ref]

A researcher whose team investigated how fluorescent microsphere size affects measurements of a confocal point spread function. A finite bead is an extended object, so its image includes both optical blur and its own dimensions. The study combines numerical calculations with measurements to assess that calibration bias.^[ref]

A physics researcher whose joint demonstration used a Stirling engine with a copper-wool regenerator. Gas passing between hot and cold regions temporarily transfers heat to this material and retrieves it on the return passage. The apparatus gives a concrete illustration of internal heat recovery during a thermodynamic cycle.^[ref]

A contributor to experiments that use a Stirling engine to demonstrate both a heat engine and refrigeration. Driving the apparatus mechanically reverses its function: instead of extracting work from a temperature difference, it moves heat between regions. The same machine therefore connects two thermodynamic operating modes.^[ref]

A researcher whose joint teaching experiment displayed the pressure-volume cycle of a Stirling engine. Heating one part of the cylinder and water-cooling another drives repeated expansion and compression. The resulting diagram lets students distinguish a complete engine cycle from a single gas-expansion process.^[ref]

A physics educator whose joint work turned a Stirling engine into a quantitative thermodynamics demonstration. A moving mirror and laser spot trace changes in pressure and volume. The enclosed loop makes pressure-volume work visible, connecting the engine’s moving pistons with an energy balance.^[ref]

Manfred Bayer coauthored the 2014 observation of Rydberg excitons in cuprous oxide. The electron-hole bound states reached principal quantum numbers up to 25, with spatial extents measured on micrometre scales. Their large size strengthens interactions between excitations, and the experiment found evidence that one excitation suppresses creation of another nearby. The result brings highly excited atomic-like states and collective optical effects into a solid.^[ref]

A researcher whose team studied large excitons in cuprous oxide. The 2014 result showed that electron–electron hole bound states can have spatial extents thousands of times larger than a typical ground-state exciton, opening an experimental route to strongly interacting optical excitations within a solid.^[ref]

A researcher in quantum optics whose joint work on Rydberg excitons connects highly excited atomic states with optical excitations in semiconductors. The 2014 study found evidence of Rydberg blockade: the presence of one large exciton suppresses the creation of another nearby.^[ref]

A researcher who contributed to the 2014 observation of Rydberg excitons in a semiconductor. Their large spatial extent strengthens interactions between excitations, making these states useful for studying collective optical behavior in a crystal rather than only the properties of isolated electron–electron hole pairs.^[ref]