Figure 4

PA assessment of mammalian cells nonspecifically loaded by MB, nMNP, and nMNP-GNR. (a) 3D combined dark-field and transmission image of breast cancer cell with cross-sectional display (dashed line). (b) PA signal amplitude from breast cancer cells with MBs as a function of laser fluence at 532 nm. (c,d) PA spectra of breast cancer cells with nMNPs (c) and leukocytes with nMNP-GNRs (d).