Direct laser writing of optical biosensor based on photonic Floquet topological insulator for protein detection

摘要

Photonic Floquet topological insulators (PFTI) allow scatter-free propagation of light along its edges. The PFTI ofinterest consists of helical waveguides arranged in a honeycomb lattice. When irradiated with an input beam on the edgeof the PFTI, light propagates from one end of the waveguide-system to the other along the edges. The intensity and thefinal position of light is theoretically found to be dependent on the difference in the refractive indices of the core andcladding of the waveguides. For a system of helical-waveguides filled with a solvent, the effective refractive index of thesystem varies with the concentration of the analyte in the solvent and this can be measured by monitoring the positionand intensity of the output-light. This paper discusses the design, principle, simulation and fabrication of such a PFTIbased biosensor.