Fig. 3.

In vitro dual-modality contrast enhancement of nanowire and lasing emission spectra. (a) Fluorescence image of nanowire-labeled macrophages cultured on the hydrogel layer. Four macrophages are selected as tracking targets. (b) 2D X-Y plane OCT image of the same field of view in (a). The locations of the four macrophages labeled with 1-4 match well between (a) and (b). The nanowires provide enhanced imaging contrast in both OCT and FM. (c) Unique lasing spectra (1)-(4) collected from the four selected macrophages in (a) and (b). Scale bar: 100 µm.