Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 111, Issue 3, Pages 791-798Publisher
SPRINGER
DOI: 10.1007/s00339-013-7648-9
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Funding
- Canadian Institute for Photonic Innovations
- Natural Sciences and Engineering Research Council of Canada
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Femtosecond laser micromachining together with Laser Induced Breakdown Spectroscopy (LIBS) allows us to drill precise hole in materials to internal buried layers as well as characterize the materials while drilling. We report detection of a metal layer buried deep inside silicon by creating an access hole through the semiconductor. We used 800 nm femtosecond laser pulses to carry out the drilling while monitoring the plasma emission with a spectrometer system. Higher drilling rates of 1 mu m per shot were achieved using a Gaussian laser beam profile with peak fluences of 42 J/cm(2). Lower drilling rates of 30 nm per pulse with better accuracy could be achieved using lower intensity flat top beam profiles at fluences of 1.4 J/cm(2).
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