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The evolution of nanogratings in a porous glass was directly observed, revealing that the nanogratings origin from the standing plasma waves at the interfaces excited by femtosecond laser pulses.
We report on controllable production of 3D high-aspect-ratio (length to width ratio > 1,000) nanochannel with a width of ∼40 nm in glass by femtosecond laser direct writing, and demonstrate its applicability for DNA analysis.
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