We have developed a novel and highly effective method for structural surface modification (J. Appl. Phys. 105, 026105 (2009)) achieved by simultaneous dual action of XUV, obtained from high-order harmonic generation, and visible-near infrared ultrashort laser pulses. Although the fluence of each individual beam was far below the surface modification threshold, very efficient and specific material expansion was observed after irradiation of poly(methyl methacrylate) sample by more than 20 shots of mixed XUV/visible-NIR radiation.
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