Picosecond (~10 ps) pulsed laser irradiation at 532 nm led to the efficient and scalable fabrication of dichroic areas in glass with spherical silver nanoparticles of ~30 – 40 nm in diameter embedded in a surface layer of thickness ~20 µm. The observed dichroism is due to the uniform and permanent shape transformation of the nanoparticles - from spherical to spheroidal shapes - throughout the irradiated areas and along the laser polarization direction, paving the way for affordable manufacture of polarization-selective diffractive optical elements. The shape modification threshold and the dichroism as a result of Surface Plasmon Resonance band separation were identified. The process was then studied as a function of the laser polarization, repetition rate and the number of pulses fired per spot.
- Laser materials processing
- Glass and other amorphous materials
- Optical materials
Tyrk, M. A., Gillespie, W. A., Seifert, G., & Abdolvand, A. (2013). Picosecond pulsed laser induced optical dichroism in glass with embedded metallic nanoparticles. Optics Express, 21(19), 21823-21828. https://doi.org/10.1364/OE.21.021823