Table 1.

The ranges of two bandpass filters for different lasers; filter-I is for the scattered light from GNP and filter-II for the fluorescence of PI.

laser	458 nm	488 nm	514 nm	561 nm	633 nm
filter-I	443-561 nm	465-550 nm	497-561 nm	508-572 nm	615-647 nm
filter-II	604-668 nm	604-668 nm	604-668 nm	604-668 nm	604-630 nm