Figure 1: Concept and structure.
From: Partially reduced graphene oxide based FRET on fiber-optic interferometer for biochemical detection
(a), shows the principle of the graphene based ‘FRET on fiber’. Due to the competition on the prGO, fluorescent restoration and optical phase modulation can occur simultaneously. (b), schematically demonstrates the detection system containing two channels. One is for fluorescence detection, and the other is for all-fiber interference phase measurement. The prGO coated fiber-optic modal interferometer is integrated in the detection system and fixed in a buffer with effective volume of 0.1 mL. Analytes are injected in and removed from the buffer. (c), illustrates the probe structure in details. prGO film (black hexagons) is deposited around the etched MMF section. In the interferometer, interference between HE11 and HE12 mode occurs, while the HE12 mode is enhanced in the prGO-coated area (simulated by FEM method, COMSOL). (d), the scanning electronic microscope (SEM) image, in which the dark film is the prGO film. (e), the zoom-in of (d).
