Tamm Plasmon-Mediated Tunable Absorption Switching in Atomically Precise Pt₁₇ Nanoclusters for Nonlinear Photonic Applications

Abstract

Metal nanoclusters, created with atomic precision, are an exceptional class of ultrasmall molecule-like functional materials with wide applications in nonlinear nanophotonics. These ultrasmall clusters exhibit intriguing quantum size effects, leading to discrete energy levels and size-dependent optical and electronic properties. The effective integration of nanoclusters in photonic structures can improve their nonlinear optical properties by promoting a stronger light−matter interaction. In this paper, we demonstrate Tamm cavity-induced nonlinear optical characteristics of ligand-protected platinum-17 metal nanoclusters. The spectral tunability of the Tamm resonance mode is explored by controlling parameters, such as the number of bilayers, spacer layer thickness, and metal characteristics. The nanosecond nonlinear optical studies demonstrate excellent nonlinear absorption properties, attributed to the coupling of Tamm plasmons with the nanoclusters. Notably, a switching behavior in the intensity-dependent absorption coefficient is observed at resonant and offresonant excitations, suggesting potential applications in optical switching and tunable nonlinear filters.