Phys.org  April 14, 2023 Optical computing with optical transistors has emerged as a possible solution to the growing computational workloads, yet an on-chip nano-optical modulation remains a challenge due to the intrinsically noninteracting nature of photons in addition to the diffraction limit. An international team of researchers (South Korea, Russia) has presented an all-optical approach toward nano-excitonic transistors using an atomically thin heterobilayer inside a plasmonic tip-based nanocavity. Through optical wavefront shaping, they selectively modulated tip-enhanced photoluminescence (TEPL) responses of intra- and interlayer excitons in a ∼25 nm2 area, demonstrating the enabling concept of an ultrathin 2-bit nano-excitonic transistor. They […]