Open AccessNovel fabrication technique for NiTi and TiN micro-structures by femtosecond lasers
Author(s) -
M. Jithin,
K. Ganapathi,
N.K. Udayashankar,
S. Mohan
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/872/1/012113
Subject(s) - materials science , surface micromachining , nickel titanium , fabrication , femtosecond , optoelectronics , tin , thin film , reactive ion etching , silicon , laser , etching (microfabrication) , sputtering , substrate (aquarium) , titanium nitride , metallurgy , nanotechnology , nitride , optics , shape memory alloy , layer (electronics) , medicine , oceanography , alternative medicine , physics , pathology , geology
NiTi shape memory alloy (SMA) thin films were deposited onto silicon substrate using pulsed DC magnetron sputtering technique. To obtain crystalline NiTi thin films has to be synthesized at higher temperatures (475 - 525) °C. This high temperature requirement restricts the ease in conventional lithographic procedures. The recent advancements in the laser micromachining lend their applications into the fabrication of miniaturized systems. The femtosecond lasers (FSL) allow non-thermal processing of materials by ablation. This work focuses on the deposition and fabrication of NiTi (≈1.5 μm. thick) and titanium nitride (TiN ≈0.3 μm. thick) thin films based miniaturized systems by femtosecond laser bulk micromachining. The NiTi and TiN microstructures were release by bottom silicon etch using reactive ion etching chlorine chemistry (RIE-Cl).