Figure 1: DTTM–Schottky photodetector.

A plasmonic device possessing the DTTM active antenna structure for photodetection well below the semiconductor band edge. (a) Energy band diagram for plasmonically driven ‘hot’ electrons over a metal–semiconductor Schottky barrier. (b) Schematic representation of the electrical measurement set-up and proposed DTTM active antenna structure on a Si-based device. (c) Top-view and cross-sectional scanning electron microscopy images of DTTM structures on Si substrates.