Figure 1

Schematic of FsLDW-fabrication of protein-based 3D WGM microlasers and related tests of lasing actions.

(a) 1, BSA/RhB composite aqueous ink for FsLDW; 2 and 3, illustration of BSA biomacromolecules loaded with RhB small molecules via electrostatic force in neutral aqueous solutions. (b) 1, fluorescent spectrum of BSA/RhB composite aqueous ink under 532-nm laser light excitation; 2, lasing spectrum from a proten-based 3D microdisk WGM-laser with diameter of 30 μm. (c) The schematic of aqueous FsLDW and lasing test of protein-based 3D WGM microlaser. (d) 1, the dark-field fluorescence microscopy image of the 30-μm-diameter proten-based 3D microdisk WGM-laser in 2; 2, optical microscopic image of a 30-μm-diameter proten-based 3D microdisk WGM-laser; scale bar, 10 μm. The schematic was drawn by Yun-Lu Sun.