Near-unity light collection efficiency from quantum emitters in boron nitride by coupling to metallo-dielectric antennas

Xiangzhi Li, Robert A. Scully, Kamran Shayan, Yue Luo, Stefan Strauf

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

The bright and stable single-photon emission under room temperature conditions from color centers in hexagonal boron nitride (hBN) is considered as one of the most promising quantum light sources for quantum cryptography as well as spin-based qubits, similar to recent advances in nitrogen-vacancy centers in diamond. To this end, integration with cavity or waveguide modes is required to enable ideally lossless transduction of quantum light states. Here, we demonstrate a scheme to embed hBN quantum emitters into on-chip arrays of metallo-dielectric antennas that provides near unity light collection efficiencies with experimental values up to 98%, i.e. a 7-fold enhancement compared to bare quantum emitters. Room-temperature quantum light emission in the 700 nm band is characterized with single-photon emission rates into the first lens up to 44 MHz under continuous excitation and up to 10 MHz under 80 MHz pulsed excitation (0.13 photons per trigger pulse) into a narrow output cone (±15°) that facilitates fiber butt-coupling. We furthermore provide here a direct measurement of the quantum yield under pulsed excitation with values of 6-12% for hBN nanoflakes. Our demonstrated scheme could enable low loss spin-photon interfaces on a chip.

Original languageEnglish
Pages (from-to)6992-6997
Number of pages6
JournalACS Nano
Volume13
Issue number6
DOIs
StatePublished - 25 Jun 2019

Keywords

  • 2D materials
  • Color center
  • Hexagonal boron nitride
  • Metallo-dielectric antenna
  • Quantum yield
  • Single-photon source

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