Emerging optical techniques for sniffing out millimeter- to sub-micron-scale plastics in aquatic settings could aid in the fight against a looming environmental threat.
IMAGE OF THE WEEK
Extreme Ultraviolet Vortex
The far-field intensity profile of an EUV vortex beam carrying orbital angular momentum is characterized using an EUV Hartmann wavefront sensor (Imagine Optic, France), and is shown in a false-color map. The intricately intertwined, multi-ring feature originates from the contribution of long electron quantum paths during high-harmonic generation in an argon-filled gas cell. Other contributors: Eirini Papagiannouli, Laboratoire de Physique des Gaz et des Plasmas, Université Paris-Saclay, France.
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