Nanoscale reshaping of resonant dielectric microstructures by light-driven explosions

Area of Science:

• Materials Science
• Nanotechnology
• Laser Physics

Background:

• Current femtosecond-laser-assisted material restructuring is limited by the diffraction limit of light.
• Achieving nanoscale precision requires novel approaches beyond conventional optical methods.

Purpose of the Study:

• To demonstrate a method for creating deeply-subwavelength features in silicon.
• To explore controllable nanoscale material processing using laser-induced phase explosions.

Main Methods:

• Utilized short trains of mid-infrared femtosecond laser pulses on prefabricated silicon resonators.
• Employed particle-in-cell simulations to model laser-matter interactions and phase explosion phenomena.
• Investigated the influence of laser pulse intensity, polarization, and number on feature geometry.

Main Results:

• Achieved controllable formation of high aspect ratio (>10:1) nanotrenches as narrow as [Formula: see text] in silicon.
• Demonstrated that trench geometry is scalable with laser wavelength.
• Validated experimental findings with particle-in-cell simulations showing localized nanoscale phase explosions.

Conclusions:

• Femtosecond-laser assisted nanostructuring of engineered microstructures (FLANEM) enables fabrication of subwavelength features.
• This technique offers a scalable and controllable method for nanoscale structuring of silicon.
• Opens new avenues for high-throughput optical methods in nanofabrication.