Enhanced nonlinear refractive index in epsilon-near-zero materials

Caspani, L. et al. (2016) Enhanced nonlinear refractive index in epsilon-near-zero materials. Physical Review Letters, 116(23), 233901. (doi: 10.1103/PhysRevLett.116.233901)

119205.pdf - Accepted Version



New propagation regimes for light arise from the ability to tune the dielectric permittivity to extremely low values. Here, we demonstrate a universal approach based on the low linear permittivity values attained in the ε-near-zero (ENZ) regime for enhancing the nonlinear refractive index, which enables remarkable light-induced changes of the material properties. Experiments performed on Al-doped ZnO (AZO) thin films show a sixfold increase of the Kerr nonlinear refractive index (n2) at the ENZ wavelength, located in the 1300 nm region. This in turn leads to ultrafast light-induced refractive index changes of the order of unity, thus representing a new paradigm for nonlinear optics.

Item Type:Articles
Additional Information:L.C. and M.F. acknowledge the support from the People Programme (Marie Curie Actions) of the European Union's FP7 Programme under REA grant agreement no. 627478 (THREEPLE) and no. 329346 (ATOMIC), respectively. D.F. acknowledges financial support from the European Research Council under the European Union Seventh Framework Programme (FP/2007-2013)/ERC GA 306559 and EPSRC (UK, Grant EP/M009122/1).
Glasgow Author(s) Enlighten ID:Faccio, Professor Daniele and Clerici, Professor Matteo
Authors: Caspani, L., Kaipurath, R.P.M., Clerici, M., Ferrera, M., Roger, T., Kim, J., Kinsey, N., Pietrzyk, M., Di Falco, A., Shalaev, V.M., Boltasseva, A., and Faccio, D.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN (Online):1079-7114
Published Online:08 June 2016
Copyright Holders:Copyright © 2016 American Physical Society
First Published:First published in Physical Review Letters 116(23):233901
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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