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. Author manuscript; available in PMC: 2017 Feb 7.
Published in final edited form as: Lab Chip. 2016 Feb 7;16(3):586–592. doi: 10.1039/c5lc01415h

Figure 2.

Figure 2

Schematic illustration of the integrated optical head. Blue arrows show the optical path from one LED with filters to the VRC. The green arrow shows the optical path of excited fluorescence to the photodiode. Light emitted from a blue LED passes through the blue filter in order to remove the green portion of emitted light, then reflects off the dichroic mirror through a donut shape heater and is focused on the sample by an aspherical lens. Excited fluorescence is collimated by the same lens, passing through the dichroic mirror with the blue portion filtered out by a green filter. Residual green light interacts with a photodiode and induces a photocurrent, which is further processed.