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The SEM image of the microtubes (a). One single microsphere with diameter about 6 μm in the microtube (b) and another sphere with the same diameter was manipulating into the microtube (c).
The schematic experimental configuration.
Spectra of the single sphere in the tube with excitation laser focus at different plane of the sphere (a). The schemes of the excitation and detection at different plane of the sphere (b). The spacing between each two plane is 1 μm.
The spectra of the microtube-single sphere (black line) and the microtube-bisphere (red line). The insets are dark-filed fluorescence microscope images of the spheres in the tube.
The relationship of WGM peak intensity and the excitation power (a). FDTD simulation of the electric field intensity distribution of the single microsphere (b) and the bisphere in the tube (c). The simulation light source is a Gauss modulated continuous wave with the central wavelength of 0.532 μm.
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