Figure 1
From: High fidelity fibre-based physiological sensing deep in tissue
Optrode fabrication and characterisation. (A) Bright-field image of a fibre (viewed from the side) with etched pits (~10 µm in depth). (B) Fluorescence image (excitation 488 nm and emission 520 nm) of the etched fibres (viewed from the side) after the pH sensors (fluorescein-based) were loaded into the pits. Note the focal plane of image in (B) is different from (A) to highlight the loaded cores. (C,D) SEM images of an etched optical fibre before and after the addition of the microspheres. The scale bar in all the images is 50 µm.
