On the basis of this approach, more complex plasmonic as well as photonic circuits can be developed. For example, multiple quantum dots can be coupled via plasmonic circuits to achieve photonic transistors.
By applying voltages on the gold wires, it may be possible to electrically tune the transitions of the quantum dots into resonance.
By using site-controlled self-assembled quantum dots, additional flexibility with device design can be obtained.
The authors point out that in situ lithography approaches using photoluminescence or cathodoluminescence or approaches of predetermination of the quantum dot position could also help to position quantum dots in devices.
Plasmonic components such as interferometers, modulators, and switches can be readily integrated due to the flexible EBL-based fabrication.
Moreover, electrical excitation of the quantum dot and electrical detection of single-plasmons can be implemented to make all-on-chip circuits.
"Semiconductors are well-developed materials for integrated electronic circuits and a wide variety of semiconductor-based quantum photonic circuits are being established as well," the authors conclude their report. "Our work shows that by making use of the self-assembled quantum dots, quantum plasmonic circuits can also be built on semiconductor platforms, and it thus opens the way to integrate electronic, photonic, and plasmonic devices on one semiconductor chip for applications of quantum technologies."