## Saturday, March 12, 2016

### Abstract-Giant nonlinearity in a superconducting sub-terahertz metamaterial

Appl. Phys. Lett. 108, 101107 (2016);

We report a superconducting sub-THz metamaterial operating in a CW-regime, which exhibits a record-breaking resonant third-order nonlinearity with effective ${n}_{2}\sim 10 {\text{cm}}^{2}/\mathrm{W}$. The nonlinear response is caused by the radiation-induced resistive heating, suppressing the superconductivity in the nano-scale constrictions of the structure's meta-molecules. The nonlinearity has a relaxation time of $25 \mu \mathrm{s}$ and leads to a substantial change of the amplitude and phase of the transmitted radiation at intensities of only $500 \mu {\mathrm{W}/\text{cm}}^{2}$.