Optics

Working principle of the Fourier-optics-based angle-resolved imaging spectrometer.
A deep neural network that learns from large-scale experimental optical data—rather than repeated electromagnetic simulations—can rapidly predict device performance, explore large...
June 25, 2026
Credit: Cirrus Logic
Bringing signal conversion closer to the sensor unlocks new performance gains.
June 25, 2026
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Following the Photons: A Photonics Podcast
June 23, 2026
FIGURE 1. Right panel: Process Engineer Catherine Nguyen of Thorlabs holds the first produced 8-in. AlGaAs crystalline supermirror. Scaling the mirrors to large size is necessary to be used in gravitational wave detectors. The inset diagram shows the face-centered cubic zincblende structure of GaAs. In this depiction of a unit cell, gallium anions are blue and arsenic cations are red. In alternating layers of the coating, some of the gallium atoms are replaced by aluminum, resulting in the ternary alloy AlxGa1-xAs (AlGaAs) where x is the Al mole fraction, which has a lower refractive index than GaAs. Left panel: Schematic of the crystalline coating process. A GaAs/AlGaAs epitaxial Bragg mirror is grown on a base GaAs growth wafer, which is in turn directly bonded to the optical substrate (in this case comprising super-polished fused silica). Bonding is realized using a plasma-activated process, with a modest (<150°C) post-contact anneal. The GaAs growth wafer is then selectively removed via wet chemical etching, leaving the transferred epitaxial Bragg structure on the final optic.
June 22, 2026
Yu-Jie Lin (left) holds the metalens the group developed, and Professor Zhiwen Liu is on his right.
June 17, 2026
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June 17, 2026
Credit: Zheru Qiu/EPFL
Zheru Qiu and colleague Xuan Yang in the lab with the team’s on-chip ultrafast laser.
June 12, 2026
Credit: Optalysys
Optalysys waveguides.
June 3, 2026
Credit: Caroline Perron
Pierre Luc Thériault, a Ph.D. student in engineering physics, aligns the team’s experimental setup.
June 2, 2026

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