Nanoscale confinement of energy deposition in glass by double ultrafast Bessel pulses

Nanophotonics

article

Jesus del Hoyo¹  Remi Meyer¹  Luca Furfaro¹  Francois Courvoisier¹ 

[1] FEMTO-ST Institute, Univ. Bourgogne Franche-Comté;Applied Optics Complutense Group, Optics Department, Universidad Complutense de Madrid

关键词: Bessel beams;    glass processing;    nanoplasma;    silicon dioxide;    ultrafast pulses;    warm dense matter;   

DOI  :  10.1515/nanoph-2020-0457

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

Ultrafast laser pulses spatially shaped as Bessel beams in dielectrics create high aspect ratio plasma channels whose relaxation can lead to the formation of nanochannels. We report a strong enhancement of the nanochannel drilling efficiency with illumination by double pulses separated by a delay between 10 and 500 ps. This enables the formation of nanochannels with diameters down to 100 nm. Experimental absorption measurements demonstrate that the increase of drilling efficiency is due to an increase of the confinement of the energy deposition. Nanochannel formation corresponds to a drastic change in absorption of the second pulse, demonstrating the occurrence of a phase change produced by the first pulse. This creates a highly absorbing, long-living state. Our measurements show that it is compatible with the semi-metallization of warm dense glass which takes place within a timescale of <10 ps after the first laser pulse illumination.

【 授权许可】

CC BY