Hexagonal microlasers based on organic dyes in nanoporous crystals

Abstract

Molecular sieves, such as nanoporous AlPO4-5, can host a wide variety of laser active dyes. We embedded pyridine 2 molecules as a representative of a commercially available dye which fits into the channel pores of the host matrix. Many efficient dye molecules, such as rhodamines, do not fit into the pores. But modifying the structure of the dyes to appear like the used templates allows to increase the amount of encapsulated dyes. The properties of resulting microlasers depend on size and shape of the microresonators, and we discuss a model for microscopic hexagonal ring resonators. In terms of pump needed to reach lasing threshold molecular sieve microlasers are comparable to VCSELs. For dyes which fit into the pores we observed a partial regeneration of photo-induced damage.

Inferring periodic orbits from spectra of simply shaped microlasers

“…The other members of these families have similar patterns. The existence of such families was firstly noted in [21] for hexagonal dielectric cavities, then further detailed in [20].…”

Boundary element method for resonances in dielectric microcavities

“…Numerical simulations on rounded hexagons based on the wavematching method have shown convergence problems at corners [15,36]. The following example is relevant for future experiments and demonstrates that the BEM can handle arbitrarily sharp corners and, moreover, coupled resonators.…”

Hexagonal dielectric resonators and microcrystal lasers

“…Both introduce a characteristic length scale: the wavelength λ ranging from 600nm to 800nm, and the side length R of the hexagonal cross section of the crystal ranging from 2.6µm to 4.6µm in Refs. [1,2]. In current experiments, larger crystals with R up to 20µm are under investigation.…”