Abstract

We demonstrate a strong and anisotropic photomixing effect in an electronic system whose energy–momentum dispersion is parabolic in the $x$ direction and linear in the $y$ direction, such as a ${\mathrm{TiO}}_2/{\mathrm{VO}}_2$ multilayered structure. The third-order photoresponses along the linear and parabolic directions have been analyzed and determined quantitatively. We have found a remarkable tunability of the mixing efficiency along the parabolic direction by a small electric field in the linear direction, up to two orders of magnitude. In the terahertz (THz) regime, the third-order response is comparable to the linear response under an applied field of ${10}^3–{10}^4\mathrm{V}/\mathrm{cm}$. Additionally, the nonlinear response persists at room temperature. The results may have applications where different current responses are required along different directions in the THz regime.

© 2019 Optical Society of America

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