Fig. 6.

Material specific detection of nanoparticles using IRIS. (a) Background normalized peak response for 52 nm gold (red) and 70 nm silver (black) nanoparticles is shown as a function of defocus. (b) Interferometric image at 525 nm at a defocus of 250 nm. The scale bar denotes 2 micron. (c) High-throughput material based classification of 52 nm Au and 70 nm Ag particles. The measurements were done on separate chips. (d) Simultaneous detection of 52 nm Au and 70 nm Ag particles.