Ultrafast and Highly Collimated Radially Polarized Photons at Room Temperature from a Colloidal Quantum Dot Coupled to a Hybrid Nanoantenna

Alexander Nazarov, Yuval Bloom*, Boaz Lubotzky, Hamza Abudayyeh, Annika Mildner, Lorenzo Baldessarini, Yuval Shemla, Eric G. Bowes, Monika Fleischer, Jennifer A. Hollingsworth, Ronen Rapaport*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

To harness the potential of radially polarized photons for classical and quantum communication applications, we demonstrate an on-chip, room-temperature device, which generates highly directional radially polarized photons at very high rates. The photons are emitted from a giant CdSe/CdS colloidal quantum dot (gQD) accurately positioned at the tip of a metal nanocone centered inside a hybrid metal-dielectric bullseye antenna. We show that due to the large and selective Purcell enhancement specifically for the out-of-plane optical dipole of the gQD, the emitted photons can have a very high degree of radial polarization (>93%), based on a quantitative metric. Our study emphasizes the importance of accurate gQD positioning for optimal radial polarization purity through extensive experiments and simulations, which contribute to the fundamental understanding of radial polarization in nanostructured devices and pave the way for implementation of such systems in practical applications using structured quantum light.

Original languageEnglish
JournalACS Photonics
DOIs
StateAccepted/In press - 2024

Bibliographical note

Publisher Copyright:
© 2024 The Authors. Published by American Chemical Society.

Keywords

  • metal-dielectric nanoantenna
  • nanophotonics
  • plasmonic resonator
  • Purcell factor
  • quantum dot
  • radial polarization

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