Innovative Approach to Achieving Polarization Dependent Highly Directional Nanolasers Through Propagating States in...

With their extremely small mode volumes, excellent field enhancement, and low radiative loss, metallic nanoparticle arrays supporting plasmonic lattice resonances have emerged as a potential design for on-chip plasmonic lasers. Due to the similarities between photonic crystals and plasmonic lattices in terms of structural features and energy band structure, the properties of plasmonic lattice-based nanolasers, including low threshold, lasing wavelength, coherence, directionality, and polarization, can be designed using band structure computations. Here 2D plasmonic lattices of Al nanocone arrays (NCAs) are presented, supporting narrow linewidth resonances that provide optical feedback for the stimulated emission process of optically pumped Rhodamine 6G (R6G). Remarkably, highly directional nanoscale lasing with polarization dependence at red-light wavelengths is presented by the artificially predesigned plasmonic band structure at the propagating state with different lattice symmetries and enables effective coupling with quantum emitters at various wavelengths. Furthermore, the lasing dynamics in these structures are also investigated, employing a dynamic semi-quantum approach that considers both stimulated and spontaneous emission. These findings broaden the lasing characteristics diversity in plasmonic nanoparticle arrays and provide a simple framework for presenting promising prospects for the management and operation of on-chip nanoscale laser sources.