Ultrafast Manipulation of Six-Channel Plasmonic Multiplexer with Chirped Laser Pulse

Abstract

Compact plasmonic multiplexing devices serve as key components in ultrafast on-chip optical communication, optical field capture, and micro-manipulation systems. Active manipulation of surface plasmon polariton among multiple propagation channels within the nano-femto spatiotemporal scale remains a significant research challenge. Here, we propose a six-channel plasmonic multiplexing/demultiplexing device based on asymmetric Babinet-inverted slit pairs. By tuning the wavelength and polarization of incident light, the device enables selective excitation of SPPs across six distinct propagation channels. Notably, ultrafast switching of SPP pulses among the different excitation channels is achieved with the introduction of chirp into the incident femtosecond laser pulse. The result provides a new method for designing and optimizing the compact and effective on-chip optoelectronic devices.