Engineering and Characterizing CsPbBr3 quantum dots for single-photon emission applications

events hall

Ms. Alina Nagel, M.Sc. Candidate

06.02.2022

The Auditorium, Meidan, for green pass holders, or via ZOOM

14:30

Lead halide perovskite quantum dots (QDs) have gained much attention due to their high photoluminescence quantum yield, facile fabrication, and control of the emission wavelength. Due to the combination of these exceptional optical properties with their ability to emit single photons by demand, Lead halide perovskite QDs are great candidates for light sources for quantum computation and communication. One disadvantage of these QDs is their low stability when exposed to oxygen and humidity, resulting in a spectral shift of the emission wavelength and loss of the photoluminescence intensity. Polymeric encapsulation of QDs has been demonstrated to increase stability under UV light excitation and prolong the optical properties while stored. We have developed a process in which we demonstrate a 3D printing method that enables both positioning and encapsulation of single QDs. We use a standard affordable 3D printer and polymers to print waveguides containing single-photon emitters that can be positioned with micrometric resolution. The quantum nature of the emitters was demonstrated through g2 correlation measurements, and the protective properties of the polymer are clear with a 15-fold enhancement of the single photon emission life cycle. Finally, we show that suspended fibers which are significantly thinner in their diameter act as waveguide for the single-photons and open possibilities for future quantum communication on chip devices.

 

Supervisor: Dr. Yehonadav Bekenstein

Link to ZOOM