Nanoantenna-induced current enhancement of nano-sized metal/oxide interfaces

Nanoantenna resonance is demonstrated on nano-sized gold/SrTiO3 interfaces. This resonance arising from the collective oscillation of free electrons results in photocurrent current enhancement, facilitated by the built-in electric field at the Schottky interface. This current enhancement around the nanoantenna resonance peak can be attributed to hot electron generation and extraction. The photocurrent dependence on incident wavelength and power was characterized. Applying external bias, improved the current enhancement by orders of magnitude.