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When the pump laser was circularly polarized, time reversal symmetry (in which behavior remains the same whether time runs forward or backward) was broken and a topological gap was opened (with Chern number C=1). “On the other hand, when the pump laser is linearly polarized the gap remains closed,” Zhen says. “Essentially, we verified all […]

In this episode of Photonics Hot List: Diagnosing diabetes typically requires invasive, expensive lab work. But Penn State researchers are making the process simpler with a sensor that can diagnose via just a breath sample. Laser and machine tool manufacturer TRUMPF is joining forces with technology company Siemens to accelerate digital manufacturing and AI readiness.

In an advance for frequency combs, Alireza Marandi, a professor of electrical engineering and applied physics at Caltech, and his team recently created a nanophotonic device to produce a broad range of laser light frequencies with ultrahigh efficiency on a microchip. How did they pull it off? By combining dispersion engineering—shaping the way different wavelengths

In mid 2025, Amazon crossed a milestone that would have seemed like science fiction a decade ago: One million autonomous robots are deployed across its logistics operations. It’s a staggering figure—one that illustrates how far automation has come and how quickly it’s spreading. Meanwhile, lawmakers are considering the first federal frameworks for robotics and autonomous