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 […]
Category Archives: Optical computing
Harnessing noise in optical computing for AI
Techxplore January 21, 2022 The inherent optoelectronic noises make the photonic systems error-prone in practice. To mitigate and harness noises in photonic computing systems a team of researchers in the US (University of Washington University, Duke University, University of Maryland) has designed and demonstrated a photonic generative network as a part of a generative adversarial network (GAN). The network is implemented with a photonic core consisting of an array of programable phase-change memory cells to perform four-element vector-vector dot multiplication. The GAN can generate a handwritten number (“7”) in experiments and full 10 digits in simulation. They developed an optical […]