Fig. 1. Generation of 3D tumor spheroids using the drop-based microfluidic device for photothermal therapy.

a Schematic illustration of the generation of the 3D tumor spheroids and photothermal therapy. b Microscopic image of the droplet generation junction; for illustration purposes. the microfluidic channels were filled with a green dye. The scale bar is 300 μm. c Photograph of the fabricated droplet-based microfluidic device