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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Nanooptik

Humboldt-Universität zu Berlin | Mathematisch-Naturwissen­schaft­liche Fakultät | Institut für Physik | Nanooptik | Publications | Direct measurement of quantum efficiency of single-photon emitters in hexagonal boron nitride

Niko Nikolay, Noah Mendelson, Ersan Özelci, Bernd Sontheimer, Florian Böhm, Günter Kewes, Milos Toth, Igor Aharonovich, and Oliver Benson (2019)

Direct measurement of quantum efficiency of single-photon emitters in hexagonal boron nitride

Optica, 6(8):1084-1088.

Single-photon emitters (SPEs) in two-dimensional materials are promising candidates for the future generation of quantum photonic technologies. In this work, we experimentally determine the quantum efficiency (QE) of SPEs in few-layer hexagonal boron nitride (h-BN). We employ a metal hemisphere that is attached to the tip of an atomic force microscope to directly measure the lifetime variation of the SPEs as the tip approaches the ℎ-BN. This technique enables nondestructive, yet direct and absolute measurement of the QE of SPEs. We find that the emitters exhibit very high QEs approaching (87±7)% at wavelengths of ≈580  nm, which is among the highest QEs recorded for a solid-state SPE

 

The cover of the corresponding Optica issue shows an illustration of our work.

 

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