“…However, these methods tend to be tedious and time-consuming process, and may require specialist instrumentation and/or expertise. Recently, optical strategies for real-time and in-field sensing of biomarkers have been explored, including methods based on green fluorescent protein [14], DNA sequence [15][16][17][18], nanoparticles [19][20][21], quantum dots [22][23][24], organic dyes [25,26] and metal complexes [27]. Fluorescent organic dyes, in particular, have received intense interest for biomarker detection.…”