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Photon energy conversion by near-zero permittivity nonlinear materials

United States Patent Application

20170227830
A1
View the Complete Application at the US Patent & Trademark Office
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Efficient harmonic light generation can be achieved with ultrathin films by coupling an incident pump wave to an epsilon-near-zero (ENZ) mode of the thin film. As an example, efficient third harmonic generation from an indium tin oxide nanofilm (.lamda./42 thick) on a glass substrate for a pump wavelength of 1.4 .mu.m was demonstrated. A conversion efficiency of 3.3.times.10.sup.-6 was achieved by exploiting the field enhancement properties of the ENZ mode with an enhancement factor of 200. This nanoscale frequency conversion method is applicable to other plasmonic materials and reststrahlen materials in proximity of the longitudinal optical phonon frequencies.
Luk, Ting S. (Albuquerque, NM), Sinclair, Michael B. (Albuqueruqe, NM), Campione, Salvatore (Albuquerque, NM)
15/ 040,799
February 10, 2016
STATEMENT OF GOVERNMENT INTEREST [0001] This invention was made with Government support under contract no. DE-AC04-94AL85000 awarded by the U. S. Department of Energy to Sandia Corporation. The Government has certain rights in the invention.