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The high refractive index of ZnS (about 2.4 in the visible range) makes ZnSmicrostructures good candidates for the fabrication of light guides andresonant microcavities. Light guiding behaviour has been studied in several ZnSstructures. In particular, in this work the behavior of rods and plates hasbeen investigated and it is has been shown that the morphology of the studiedstructures plays a determinant role on the supported resonant modes. In ZnS:Gaand ZnS:In structures investigated in the present work Fabry-Perot as well asWhispering Gallery resonant modes are supported. A good agreement has beenfound between the experimental results and the theoretical model used todescribe both types of resonances, which have been used to estimate therefractive index of the doped material. In ZnS:Ga wires with triangularcross-section a lasing effect has been observed in the blue-green range. To ourknowledge, it is the first time that resonant modes in visible region have beenstudied in doped ZnS.

Light guiding and optical resonances in ZnS microstructures doped with Ga or In