Gold nanoparticles in a polycarbonate matrix for optical limiting against a CW laser

作者：Frare M C^*; Weber V; Signorini R; Bozio R

来源：Laser Physics, 2014, 24(10): 105901.

DOI：10.1088/1054-660X/24/10/105901

• CW optical limiting
• plasmonic nanoparticles
• nanocomposite
• thermo-optical effects

The optical limiting behavior of thin polymer films doped with gold nanoparticles is investigated under continuous wave illumination at two different wavelengths: 488 and 514 nm. Closed aperture Z-scan measurements reveal a negative nonlinear refractive index of around 10(-6) W cm(-2), comparable with that reported for liquid samples, due to the non-local thermal refraction process. The effectiveness of the optical limiting action is assessed, for varying input powers, by measuring the transmitted irradiance in a 300 ms time interval, corresponding to the blinking time of the human eye. It is thus possible to evaluate the total fluence reaching the retina.

• 出版日期2014-10