Quantum dot photoluminescence as a versatile probe to visualize the interaction between plasma and nanoparticles on a surface

Abstract

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On the optical measurement of microparticle charge using quantum dots

“…Indeed, a red shift of the photoluminescence spectrum was observed during plasma exposure, while before the plasma ignition, the photoluminescence spectrum stayed unchanged. From Figure 4 in [37], it can be seen that the noise level in the measured…”

“…In section 4.3, we will investigate if this Stark shift could be used to measure the charge on microparticles immersed in laboratory plasmas. We note that in an experiment, ∆λ will be measured over long (> 100 ms [37]) exposure times. It will be therefore integrated over many quasi-static electron configurations as well as over many radiation acts.…”

“…To be able to judge whether the calculated Stark shift can be detected in an experiment, we estimate the detection limit based on the results of [37]. In that experiment, time-resolved measurements of the photoluminescence spectrum of QDs on a substrate surface exposed to a capacitively coupled RF plasma were performed.…”

“…Very recently [37], it was experimentally shown that the quantum-confined Stark effect of the photoluminescence of the QDs deposited on a plasma-facing surface can be used for the detection of microscopic electric fields. Extending the approach of [37], we suggest to use the QDs deposited on the surface of microparticles immersed in plasmas.…”

“…Very recently [37], it was experimentally shown that the quantum-confined Stark effect of the photoluminescence of the QDs deposited on a plasma-facing surface can be used for the detection of microscopic electric fields. Extending the approach of [37], we suggest to use the QDs deposited on the surface of microparticles immersed in plasmas. Using a simple model for the Stark shift of QD photolumeniscence spectrum, which takes into account fluctuations of the microscopic electric field, we propose the design of a microsensor that would exhibit measurable Stark shifts under typical plasma conditions.…”