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Laser-induced cavities with a controllable shape in nanoporous glass
Optics Letters
|October 1, 2020
Summary
Femtosecond laser pulses create birefringent structures within nanoporous glass, forming cavities whose shapes change with pulse count. A dense glass layer surrounds these voids, with a proposed mechanism for elongated cavity formation.
Area of Science:
- Materials Science
- Laser Physics
- Nanotechnology
Background:
- Nanoporous glass is a versatile material for optical and electronic applications.
- Femtosecond laser processing enables precise modification of materials at the nanoscale.
Purpose of the Study:
- To investigate the formation of birefringent structures within nanoporous glass using femtosecond laser pulses.
- To characterize the morphology of laser-induced cavities and surrounding dense layers.
- To elucidate the mechanism behind the observed cavity shape evolution.
Main Methods:
- Irradiation of nanoporous glass with femtosecond laser pulses.
- Microscopic analysis of the laser-modified regions to determine cavity shape and dimensions.
- Characterization of the dense glass layer surrounding the cavities.
Main Results:
- Laser-induced cavities were formed inside the nanoporous glass.
- Cavity cross-sectional shape evolved from circular to elliptical with increasing pulse numbers (1-3 pulses).
- A nearly circular layer of non-porous dense glass consistently surrounded the cavities.
Conclusions:
- The number of femtosecond laser pulses influences the shape of the induced cavity.
- Anisotropic light scattering on a spherical cavity is proposed as the mechanism for elongated cavity formation.
- Controlled modification of nanoporous glass is achievable for tailored optical properties.
