Condensed Matter Seminar- Active Control of Single Photon Sources Using 2D Materials

Abstract: Solid state quantum emitters are a mainstay of quantum nanophotonics as integrated single photon sources (SPS) and optical nanoprobes. Integrating such emitters with active nanophotonic elements is desirable in order to attain efficient control of their optical properties but typically degrades the photostability of the emitter itself. In our group, we have developed optomechanical and optoelectrical approaches to either tune energy and decay rate of single photon sources. In this talk, I will present recent experiments that demonstrate a tuneable hybrid device which integrates lifetime-limited single emitters (linewidth ~ 40 MHz) and 2D materials at sub-wavelength separation without degradation of the emission properties. Our device’s nanoscale dimensions enable ultra-broadband tuning (tuning range > 400 GHz) and fast modulation (frequency ~ 100 MHz) of the emission energy, which renders it an integrated, ultra-compact tuneable SPS. Conversely, this offers a novel approach to optical sensing of 2D material properties using a single emitter as a nanoprobe- present a new type of hybrid system, consisting of an on-chip graphene NEMS suspended a few tens of nanometres above nitrogen-vacancy centres (NVCs), which are stable single-photon emitters embedded in nanodiamonds.  
 
**Refreshments will be served 15 minutes BEFORE the seminar begins in PAS 218. **