Hot–electron emission enhancement by deep UV surface plasmon resonance on an aluminum periodic disk–hole array

We present the enhancement of the hot-electron emissions by the enhanced electric field with deep UV surface plasmon resonance (DUV-SPR). An aluminum disk–hole array was designed using the finite-difference time-domain (FDTD) method for enhancing the electric field by the disk–hole cavity coupling. We found that the photoelectron emission efficiencies were experimentally improved by four times and that the disk–hole distance was a key factor to induce the strong disk–hole coupling. The aluminum disk–hole array with DUV-SPR would be expected for many applications, such as the highly sensitive photodetectors, the photoelectron guns, and the efficient photocatalysts.