Excessive-refractive-index (HRI) dielectrics are gaining growing consideration as constructing blocks for compact lasers. Their capacity to concurrently help each electrical and magnetic modes offers larger versatility as in comparison with plasmonic platforms. Furthermore, their decreased absorption loss minimizes warmth era, additional enhancing their efficiency. Right here, we make use of a scalable gentle nanoimprinting lithography methodology to create a sequence of two-dimensional (2D) periodic sq. gap arrays in polymeric movies (SU-8), that are coated with an HRI dielectric layer (TiO2). These buildings exhibit low-threshold lasing from an natural dye-doped SU-8 layer deposited on high. We examine arrays with totally different lattice parameters and a pattern with a random distribution of holes, discovering that the optimum laser efficiency happens when the optical resonances of the array align with the emission wavelength vary of the dye. Moreover, we observe that the anisotropy within the TiO2 coating breaks the polarization degeneracy of the sq. arrays, resulting in the emergence of latest modes and enabling the simultaneous look of a number of lasing peaks. Our work reveals that, regardless of the simplicity of their fabrication course of, the HRI buildings studied right here exhibit a excessive diploma of complexity, resulting in a wealthy optical response and enabling multiband lasing. This gives an progressive strategy to constructing sturdy HRI platforms for lasing with improved management over their emission properties.
