SAMOP 2021 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 16: Quantum Optics

Q 16.5: Poster

Thursday, September 23, 2021, 16:30–18:30, P

Analyzing fluorescence lifetime of NV center in nanodiamonds using a phasor approach — •Elnaz Bazzazi, Jonas Gutsche, Ashkan Zand, and Artur Widera — Technische Universitüat Kaiserslautern und Landesforschungszentrum OPTIMAS, 67663 Kaiserslautern, Germany

The nitrogen-vacancy (NV) center in diamond has been object of intense research in quantum technology, for instance, sensing quantum information. Examining their photoluminescence in a varying environment allows engineering, controling, and detecting quantum properties of the NVs. A standard observable to sense the quantum optical properties of NVs is the fluorescence lifetime.

Here, we compare two methods used to analyze fluorescence lifetime data from highly-doped nanodiamonds. Traditionally, the data obtained by time-domain measurements from single-photon-counting modules, for example, is evaluated based on non-linear fitting. This requires choosing an appropriate model and fit function which is not always evident. Alternatively, one can consider a phasor analysis as a fit-free method employing the Fourier transform of time-domain data. We outline the principle equivalence and practical difference of both methods on data taken for lifetime measurements with pronounced non-exponential decay.