Nano-optical characterization of photosynthetic bacteria-2D material coupled system

Atomically thin 2D materials especially TMDs grown laterally, on combining with other TMDs form heterostructures with atomically sharp interfaces. We use conventional far-field (FF) photoluminescence (PL) and near-field (NF) tip-enhanced photoluminescence (TEPL) to investigate the bio-sensing applications of TMD materials by depositing photosynthetic cyanobacteria on MoS₂-WS₂ heterostructure grown on SiO₂/Si substrate. The energy transfer between the 2D materials and the photosynthetic bacteria leads to formation of an energy funnel at the pole of the bacteria. Due to this, the photoluminescence at the pole is high and is enhanced due to the cyanobacteria. The coupling between the photosynthetic bacteria and 2D material can be used for production of sustainable energy resources.