DOI: 10.1063/5.0155968 ISSN:
Direct-write projection lithography of quantum dot micropillar single photon sources
Petros Androvitsaneas, Rachel N. Clark, Matthew Jordan, Miguel Alvarez Perez, Tomas Peach, Stuart Thomas, Saleem Shabbir, Angela D. Sobiesierski, Aristotelis Trapalis, Ian A. Farrer, Wolfgang W. Langbein, Anthony J. Bennett- Physics and Astronomy (miscellaneous)
We have developed a process to mass-produce quantum dot micropillar cavities using direct-write lithography. This technique allows us to achieve mass patterning of high-aspect ratio pillars with vertical, smooth sidewalls maintaining a high quality factor for diameters below 2.0 μm. Encapsulating the cavities in a thin layer of oxide (Ta2O5) prevents oxidation in the atmosphere, preserving the optical properties of the cavity over months of ambient exposure. We confirm that single dots in the cavities can be deterministically excited to create high-purity indistinguishable single photons with interference visibility (0.941 ± 0.008).