Applied Physics Seminar

Quantum emitters (or single photon sources) are important building blocks for many applications in nanophotonics and quantum optics. Wide bandgap semiconductors are particularly interesting in this respect due their ability to host bright emitters in the whole spectral range – from ultraviolet to the infra-red.

In the first part of my talk, I will discuss an easy approach to engineer narrowband single emitters in diamond that can emit more than million counts per second at room temperature. I will also describe avenues to engineer optical resonators (e.g. photonic crystal cavities) from diamond. Cavity resonances as high as ~ 4000 at the visible spectral range are measured, and Purcell enhancement is realized.

In the second part of my talk, I will discuss an emerging platform for nanophotonics – namely silicon carbide (SiC). While SiC is primarily employed for modern optoelectronic devices, a recent discovery of single emitters and their optically active spin transitions, highlights their potential for nanophotonics application. I will show our recent discovery of novel quantum emitters based on SiC nanoparticles and nanostructures as well as methodologies to fabricate SiC cavities from a monolithic single crystal silicon carbide.