TY - JOUR
T1 - Near-unity light collection efficiency from quantum emitters in boron nitride by coupling to metallo-dielectric antennas
AU - Li, Xiangzhi
AU - Scully, Robert A.
AU - Shayan, Kamran
AU - Luo, Yue
AU - Strauf, Stefan
N1 - Publisher Copyright:
Copyright © 2019 American Chemical Society.
PY - 2019/6/25
Y1 - 2019/6/25
N2 - 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.
AB - 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.
KW - 2D materials
KW - Color center
KW - Hexagonal boron nitride
KW - Metallo-dielectric antenna
KW - Quantum yield
KW - Single-photon source
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U2 - 10.1021/acsnano.9b01996
DO - 10.1021/acsnano.9b01996
M3 - Article
C2 - 31141657
AN - SCOPUS:85067000608
SN - 1936-0851
VL - 13
SP - 6992
EP - 6997
JO - ACS Nano
JF - ACS Nano
IS - 6
ER -