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(a) Layer system for AlInP microtubes. (b) Sketch of the microtube sample partly rolled-up. (c) Light microscope image of a microtube with five resonators I-V on its substrate.
(a) Light microscope image of a microtube picked-up on a micro syringe (right) in front of a pipette tip (left). The microtube on the pipette tip is shown enlarged in the upper inset whereas the lower inset shows a corresponding FL image. (b) Spatially and wavelength resolved FL of the five resonators I-V of length on a microtube (see also Fig. 1(b)). The intensity is encoded in grey levels where white means low and dark high intensity.
(a) FL spectrum of a nominally empty (see text) microtube (red) and a microtube with a NC polymer film (black). (b) Detail spectra from the spectral region marked by the dashed frame in (a) as well as after 10 days (lower panel). (c) and (d) Simulated mode wavelengths depending on the thickness of a film with refractive index 1.52 deposited on the inner microtube wall (c) and on the refractive index of the completely filled microtube (d). Black arrows in (c) mark the experimental mode position of the empty microtube.
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