9:30 AM - 11:30 AM
[19a-PB3-25] Reduction of the Silicon Surface Reflectance by Nano-Sized Laser Ablation Pits
Keywords:Silicon surface, Optical transmittance, Laser ablation
A Si plate was irradiated with laser pulses to create ablation lines with a 600 nm width and a 2−4 μm period. Infrared spectral measurements revealed that high transmittance was attainable in the wavelength range beyond 6 μm if the polarization direction was perpendicular to the lines. Spectral peaks also appeared in the short wavelength range where the lines simultaneously induced a strong scattering. This phenomenon seemed to be caused by optical interference that was associated with the surface plasmon; i.e., theoretical calculation on the basis of the surface-wave interference yielded transmission spectra that were similar to the measured ones.