Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 32: Enabling Technologies: Sources of Quantum States of Light II

FM 32.2: Talk

Dienstag, 24. September 2019, 14:30–14:45, 1010

Quantum efficiency measurement of single photon emitters in hexagonal Boron Nitride — •Niko Nikolay1, Noah Mendelson2, Ersan Özelci1, Bernd Sontheimer1, Florian Böhm1, Günter Kewes1, Milos Toth2, Igor Aharonovich2, and Oliver Benson11AG Nanooptik & IRIS Adlershof, Humboldt-Universität zu Berlin, Germany — 2School of Mathematical and Physical Sciences, University of Technology Sydney, Australia

Single photon emitters (SPEs) in two-dimensional hexagonal Boron Nitride (hBN) are promising candidates for future sources of quantum states of light [1]. In this paper the direct and absolute measurement of the quantum efficiency (QE) of these emitters in few layers hBN is discussed [2]. In contrast to earlier approaches to determine the QE of SPEs in hBN, we use a method [2] that is independent of incomplete excitation saturation, indirect excitation paths through the yet unknown energy level system, or the detection efficiency of the setup. We used a Drexhage-type configuration and performed lifetime measurements of the SPEs as a function of their distance to a metal hemisphere attached to the tip of a Atomic Force Microscope. Two emitter families with different QEs can be identified. The highest QEs found approach 87(7) % at a zero phonon line wavelength of 580 nm.

[1] Tran, Toan Trong, et al., Nature nanotechnology 11.1 (2016): 37.

[2] Nikolay, Niko, et al., arXiv preprint arXiv:1904.08531 (2019).

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