Fig. 1. (a) Slide-launched TIR-guided illumination: elastically scattered photons are blocked
by the filter, while fluorescent photons can reach the smartphone camera. (b) Photorealistic
cut-out rendering (c) Assembly procedure: inkjet-printed lens attached onto smartphone
camera, smartphone adapter (1) fitted on smartphone, adhesive ring (2) attached to remove
stray light, color filter attached on adhesive ring for fluorescence imaging, base ring (3)
attached to adapter, threaded barrel (4) with slot enabled z-axis focusing and sample insertion,
lid (5) attached to block ambient light, LED module (6) provided illumination. (d) System
attached to smartphone.