SAMOP 2021 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 16: Quantum Optics

Q 16.3: Poster

Donnerstag, 23. September 2021, 16:30–18:30, P

Nano-Macro Transition of NV centers’ Optical Properties in Nanodiamond Agglomerates — •Jonas Gutsche, Ashkan Zand, Marek Bültel, and Artur Widera — Department of Physics, University of Kaiserslautern, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern

Color centers in diamond have developed to a fundamental building block of recent quantum technology as a single-photon source or optical quantum probe of magnetic fields. However, when such devices are ever further miniaturized, the host crystal of color centers decreases, leading to nanoscale effects. One of these nanoscale effects is the transition of the fluorescence lifetime towards higher timescales due to a change in the local density of states (DOS).

We present a systematic fluorescence lifetime study on different agglomeration states of nanodiamonds containing nitrogen-vacancy (NV) centers. The results reveal a heuristic transition on a length scale of approximately 1.8 µ m, being in the order of three wavelengths of the NV center’s emission. A simple theoretical model is employed to explain this transition due to a change of the DOS stemming from the nanodiamonds nearby and affecting the local refractive index. We find good agreement between measurement and theoretical prediction, taking the surrounding medium within 130 nm to 300 nm to calculate the local refractive index. This length scale of a quarter emission wavelength defines a transition between the nano- and macroscopic scale for optical properties.