Our latest work on ODMR published in Adv. Quantum Technol.
Join the celebrations for the 50th birthday of the University of Siegen. Check out the program Offene Uni.
Group member Lukas Hunold receives the student prize of the Kreis Olpe for his master thesis. Congratulations Lukas!
Our latest work on biosensing with planar antennas published in Biomed. Opt. Express
Check out the Adv. Photonics Theme Issue on Photonics Advances Quantum Science and Technologies
Our article on scalable SiV creation by ion implantation on the front cover of the December Issue of Adv. Quantum Technol.
Check out the JOSA B Feature Issue on Light-Matter Interaction in Complex Photonics Systems
Our latest work on planar antennas published in JOSA B
Our review on silicon-vacancy centers in diamond published in Frontiers in Physics
Our latest work on color centers in polycristalline diamond membranes published in Carbon
The Proceedings of the International School of Physics "E. Fermi", Course 204 "Nanoscale Quantum Optics", are available as en e-book here.
Silicon-vacancy color centers in phosphorus-doped diamond for bright single-photon emission under electrical pumping - DFG-RFBR Cooperation (2019-2022)
Efficient and scalable single-photon sources (SPSs) are crucial to the development of numerous quantum information technologies, such as optical quantum computers and unconditionally secure communication lines. SPSs based on quantum dots have shown much progress in the last two decades, but under ambient conditions they are being overcome by the recent advances in color centers in diamond and related wide-bandgap semiconductors. Color centers are point defects in the crystal lattice that behave nearly as isolated atoms. This property allows to obtain bright photo- and electroluminescence with a sharp emission spectrum, which cannot be achieved with any other quantum optoelectronic system under ambient conditions. However, it is still challenging to design scalable and reproducible technologies based on these emitters. In particular, it is difficult to precisely combine them with photonic and electronic nanostructures that are needed for achieving high brightness and control. This project aims at developing and investigating a novel class of bright SPSs on diamond, which operate under ambient conditions and that can be efficiently electrically driven. The project will generate an interdisciplinary collaboration and it is based on two recently proposed concepts. First, to enhance the emission properties of the color center we will use a planar antenna, which enables large extraction efficiencies and strong directional emission from materials with a large refractive index. This approach does not require fine spectral tuning nor precise positioning of the emitter at the nanoscale, which is beneficial for fabrication and device operation. Second, we will employ a novel electrical pumping scheme based on a Schottky diode, which gives the possibility of efficiently injecting minority carriers in diamond directly from the metal and it does not require complex and expensive p-i-n and p-n diamond junctions. We will create high-quality silicon-vacancy (SiV) centers in less than 100-nm-thick diamond membranes and build a planar antenna with electrodes on it. We will investigate the photon emission properties (focusing on brightness, directionality) under optical pumping and explore the possibility of electrical excitation of SiV centers at room an higher temperatures. Thus, we will demonstrate a proof of concepts of a highly efficient and chip-scale SPS that will serve as, and inspire, novel photonic sources for quantum information and quantum communication. Our activities will also generate valuable knowledge in nanophotonics and materials science, which shall be transferred to other application areas.
D. Y. Fedyanin, Moscow Institute of Physics and Technology