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The impact of a laser pulse on a microdrop of opaque liquid induces a spectacular response: The drop is propelled forward rapidly, and is strongly deformed until it breaks up or even explodes. A detailed understanding of this process is crucial for generating extreme-ultraviolet (EUV) light in nanolithography. The authors reveal that droplet propulsion is driven by localized boiling on the illuminated side and subsequent expansion, in proportion to the energy of the laser pulse.
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