
1.Department of Materials Science and Engineering, University of Toronto, Toronto, Canada
2.Department of Electrical and Computer Engineering, University of Toronto, Toronto, Canada
Dr PR Herman, Department of Electrical and Computer Engineering, University of Toronto, Toronto, Canada Email: p.herman@utoronto.ca
Published:2014-06,
Published Online:14 March 2014,
Received:23 September 2013,
Revised:27 November 2013,
Accepted:01 December 2013
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Kumar, K. et al. Quantized structuring of transparent films with femtosecond laser interference. Light: Science & Applications, 3, e157 (2014).
Kumar, K. et al. Quantized structuring of transparent films with femtosecond laser interference. Light: Science & Applications, 3, e157 (2014). DOI: 10.1038/lsa.2014.38.
The confinement of laser interactions inside transparent materials assisted by tight optical focusing and short-pulsed nonlinear interactions has driven many high-resolution patterning and probing applications in science and technology. In thin transparent films
laser interactions confined to the film/substrate interface have underpinned blistering and ejection processes for nanofluidic channel fabrication
film patterning and cell catapulting. Here
we harness femtosecond lasers to drive nonlinear interactions within Fabry–Perot interference fringes to define narrow nanolength scale zones for highly resolved internal structuring of a film of refractive index
n
film
at fringe maxima separated by
λ
/2
n
film
. This novel interaction internally cleaves the film to open subwavelength internal cavities and form thin membranes at single or multiple depths from which follow significant opportunities for writing multilevel nanofluidic channels inside the film
as well as ejecting nanodisks at quantized film depths for coloring and three-dimensional surface patterning that promise new compact types of lab-in-film devices.
blisteringdielectricslaser processingquantized etchingsubwavelength processingthin films
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