Plasmonic lattices of metal nanoparticles have emerged as an effective platform for strong light-matter coupling, lasing, and Bose-Einstein condensation. However, the full potential complex unit cell structures has not been exploited. On other hand, bound states in continuum (BICs) attracted attention, they provide topologically protected optical modes with diverging quality factors. Here, we show that quadrumer nanoparticle enable lasing a quasi-BIC mode highly out-of-plane character. By...

We experimentally observe lasing in a hexamer plasmonic lattice and find that, when tuning the scale of unit cell, polarization properties emission change. By theoretical analysis, we identify modes as quasi-bound-states continuum topological charges zero, one, or two. A $T$-matrix simulation structure reveals that mode quality ($Q$) factors depend on with highest-$Q$ favored by lasing. The system thus shows loss-driven transition between trivial high-order charge.

Photonic modes exhibiting a polarization winding akin to vortex possess an integer topological charge. Lasing with charge 1 or 2 can be realized in periodic lattices of up six-fold rotational symmetry—higher order charges require symmetries not compatible any two-dimensional Bravais lattice. Here, we experimentally demonstrate lasing as high −5, +7, −17 and +19 quasicrystals. We discover rich ordered structures increasing the reciprocal space. Our quasicrystal design utilizes group theory...

Photonic flat bands are crucial for enabling strong localization of light and enhancing light-matter interactions, as well tailoring the angular distribution emission from photonic structures. These unique properties open pathways developing robust devices, efficient nonlinear optical processes, novel platforms exploring topological quantum phenomena. So far, experimental realizations lasing in have been limited to structures that emulate geometrically frustrated lattices tight-binding,...

Multicolor light sources can be used in applications such as lighting and multiplexing signals. In photonic plasmonic systems, one way to achieve multicolor is via multimode lasing. To this, nanoparticle arrays are typically arranged superlattices that lead multiple dispersions of the single coupled Bragg superlattice modes. Here, we show an alternative enable lasing arrays. We design a supercell square lattice by leaving part sites empty. This results dispersive branches caused period hence...

Abstract Plasmonic structures interacting with light provide electromagnetic resonances that result in a high degree of local field confinement, enabling the enhancement light-matter interaction. typically consist metals, which, however, suffer from very ohmic losses and heating. High-index dielectrics, meanwhile, can serve as an alternative material due to their low-dissipative nature strong scattering abilities. We studied optical properties system composed all-dielectric nanoparticle...

Photonic modes exhibiting a polarization winding akin to vortex possess an integer topological charge. Lasing with charge 1 or 2 can be realized in periodic lattices of up six-fold rotational symmetry. Higher order charges require symmetries not compatible any two-dimensional Bravais lattice. Here, we experimentally demonstrate lasing as high -5, +7, -17 and +19 quasicrystals. We discover rich ordered structures increasing the reciprocal space. Our quasicrystal design utilizes group theory...

In this work, we study lasing in plasmonic nanoparticle arrays with complex structures. Complex structures can be formed by unit cells that contain more than one particle or creating supercells i.e. giant cells, which tens of particles. Here, supercell are based on a square array geometry. The is created leaving certain lattice sites empty, an aperiodic pattern. This repeated to form array. We calculate the band combining structure factors geometries empty approximation. show some...

Multicolour light sources can be used in applications such as lighting and multiplexing signals. In photonic plasmonic systems, one way to achieve multicolour is via multi-mode lasing. To this, nanoparticle arrays are typically arranged superlattices that lead multiple dispersions of the single coupled superlattice Bragg modes. Here, we show an alternative enable lasing arrays. We design a supercell square lattice by leaving part sites empty. This results dispersive branches caused period...