Ultrafast laser ablation, intrinsic threshold, and nanopatterning of monolayer molybdenum disulfide.

ABSTRACT: Laser direct writing is an attractive method for patterning 2D materials without contamination. Literature shows that the ultrafast ablation threshold of graphene across substrates varies by an order of magnitude. Some attribute it to the thermal coupling to the substrates, but it remains by and large an open question. For the first time the effect of substrates on the femtosecond ablation of 2D materials is studied using MoS₂ as an example. We show unambiguously that femtosecond ablation of MoS₂ is an adiabatic process with negligible heat transfer to the substrates. The observed threshold variation is due to the etalon effect which was not identified before for the laser ablation of 2D materials. Subsequently, an intrinsic ablation threshold is proposed as a true th

SUBMITTER: Solomon JM 

PROVIDER: S-EPMC9050692 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature