Tamm plasmon-induced impressive optical nonlinearity of silver@graphite core–shell nanostructures

Abstract We demonstrate the enhancement in the optical nonlinearity of materials when incorporated within a Tamm plasmon cavity (TPC). This study quantitatively investigates the enhanced nonlinear optical effects exhibited by silver@graphite (Ag@C) core–shell nanostructures integrated within a Tamm plasmon cavity. The Ag@C core–shell nanostructures were synthesized by laser ablation. The transmittance characteristics of the TPC are well-matched with those of the simulated spectra. Nonlinear optical studies, conducted using the open aperture Z-scan technique, demonstrated reverse saturable absorption (RSA) behavior in the Tamm plasmon cavity structure, and a profound enhancement in nonlinear absorption compared to that of the bare material film was also observed. The optical limiting threshold value was found to be 2.5 J/cm2 which is indeed a better value when compared to the reported values. Computational simulations illustrated a significantly intensified electric field within the Tamm plasmon cavity, suggesting the creation of enhanced photonic states leading to increased light–matter interactions. These findings underscore the potential of Ag@C core–shell nanostructures within Tamm plasmon cavities for advancing nonlinear optical devices and applications.