| Abstract: 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. |
| Filed: 2/10/2016 |
| Application Number: 15/40799 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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