Space-selective phase separation inside a glass by controlling compositional distribution with femtosecond-laser irradiation
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Space-selective phase separation was induced inside Na2O–SiO2 glasses by changing the glass composition locally from a miscible composition to an immiscible one via femtosecond-laser irradiation at a high repetition rate. The formation of a nanoscale co-continuous structure due to phase separation was confirmed by scanning electron microscopy after heat treatment, polishing until the laser-modified area was exposed, and subsequent etching. The configuration of the structure could be controlled by changing the heat-treatment time.
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