Scattering Dominated Spatial Coherence and Phase Correlation Properties in Plasmonic Lattice Lasers

Abstract

We present a comprehensive study of the polarization and spatial coherence properties of the lasing modes supported by a 4-fold symmetric plasmonic lattice. By modifying only, the scattering properties of the individual particles while keeping the lattice geometry constant, we are able to distinguish the scattering induced effects from the lattice geometry induced effects. Customized interferometric measurements reveal that the lasing emission undergoes a drastic change from 1D to 2D spatial coherence with increasing particle size, accompanied with dramatic changes in the far field polarization and beaming properties. By utilizing T-matrix scattering simulations, we reveal the physical mechanism governing this transition. In particular, we find that there exists increased radiative coupling in the diagonal directions at the plane of the lattice when the particle diameter is increased. Finally, we demonstrate that the x- and y-polarized (degenerate) lasing modes become phase locked with sufficiently large particles.

arXiv comment12 pages, 5 figures, Preprint, Submitted to New Journal of Physics

References in corpus (9)

• Lasing in dark and bright modes of a finite-sized plasmonic lattice
• Plasmon-Exciton-Polariton Lasing
• Bose-Einstein Condensation in a Plasmonic Lattice
• Geometry dependence of surface lattice resonances in plasmonic nanoparticle arrays
• Lasing at the K-points of a honeycomb plasmonic lattice
• Sub-picosecond thermalization dynamics in condensation of strongly coupled lattice plasmons
• Multiple-scattering T-matrix simulations for nanophotonics: symmetries and periodic lattices
• Polarization and phase textures in lattice plasmon condensates
• Finite size mediated radiative coupling of lasing plasmonic bound state in continuum