Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.80: Poster

Wednesday, September 7, 2022, 18:00–20:00, P2

Efficient frequency filtering of quantum dot photons using a self-constructed transmission grating monochromator — •Moritz Meinecke, Sven Höfling, and Tobias Huber — Lehrstuhl für Technische Physik, Universität Würzburg, 97074 Würzburg, Germany

Many spectroscopic measurements for characterizing quantum dot emission lines require spectral signal filtering that is narrower or matched to the expected line widths to analyze photons from different single excitonic charge complexes. Furthermore, to use the quantum dot photons for applications, this filtering should be efficient. A classical reflection monochromator is not ideal for this purpose, since it often comes with a low filter efficiency when the light is coupled to fiber, which is required for photon detection with superconducting nanowire detectors and for usage in any application. Furthermore, a reflection monochromator is strongly polarization dependent, which limits its use to non-polarization sensitive measurements, or requires polarization projection before frequency filtering. Alternative filter optics, like bandpass filters, have low flexibility and often need time consuming adjustments.

Here, we present a self-constructed transmission grating monochromator. It allows efficient, frequency filtering of quantum dot emission lines in the near infrared region. It is fully automatized and precise in approaching any filter position. Furthermore, the nearly polarization independent performance allows for polarization sensitive measurements.