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. 2020 Jun 3;22(2):41. doi: 10.1007/s10544-020-00495-3

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© The Author(s) 2020

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Fig. 2 — The optical set-up used in the oxygen measurements. The parabolic lens is in an optical contact with a glass plate, spin coated with a PtTFPP/PS film. The output of the excitation laser diode (LD, 505 nm) is collimated, attenuated and directed through a customized annular aperture, a dichroic mirror and the parabolic surface to the focal point of the system, which is located on the top surface of the glass plate. The luminescence emission is collected with the parabolic lens, a plano-convex lens and filtered through a bandpass filter to the photo multiplier tube (PMT)