Hyperbolic metamaterials have been demonstrated to have special potential in their linear response, but the extent of their non-linear response has not been extensively modeled or measured. In this work, novel non-linear behavior of an ITO/SiO2 layered hyperbolic metamaterial is modeled and experimentally confirmed, specifically a change in the sign of the non-linear absorption with intensity. This behavior is tunable and can be achieved with a simple one-dimensional layered design. Fabrication was performed with physical vapor deposition, and measurements were conducted using the Z-scan technique. Potential applications include tunable optical switches, optical limiters, and tunable components of laser sources.
Optical Materials Express
James A. Ethridge, John G. Jones, Manuel R. Ferdinandus, Michael J. Havrilla, and Michael A. Marciniak, "Optimizing switching of non-linear properties with hyperbolic metamaterials," Opt. Mater. Express 12, 4471-4483 (2022).https://doi.org/10.1364/OME.471570