Abstract

Abstract Single mode lasers, particularly red-green-blue (RGB) colors, have attracted wide attention due to their potential applications in the photonic field. Here, we realize the RGB single mode lasing in a hybrid two-dimension and three-dimension (2D–3D) hybrid microcavity (μ-cavity) with a low threshold. The hybrid 2D–3D μ-cavity consists of a polymer fiber and a microsphere. Typical RGB polymer film consisting gain materials are cladded on a fiber. To achieve single mode lasing, the polymer fiber therein serves as an excellent gain cavity to provide multiple lasing modes while the microsphere acts as a loss channel to suppress most of the lasing modes. Mode switching can be realized by adjusting the pump position. It can be attributed to the change of coupled efficiency between gain μ-cavity and loss μ-cavity. Our work will provide a platform for the rational design of nanophotonic devices and on-chip communication.

Highlights

  • The whispering gallery mode (WGM) microcavity (μ-cavity) lasing with small mode volume and high quality (Q) factor has attracted a lot of attention due to the novel physical properties and potential applications [1,2,3,4,5], such as biochemical and biological sensing [6,7,8,9,10], aerostaticSingle mode laser, can be achieved by a coupled cavity in which one μ-cavity serves as gain cavity to provide multiple lasing resonant modes, and the other μ-cavity can act as a loss channel to suppress most of the lasing modes

  • To achieve single mode lasing, the polymer fiber therein serves as an excellent gain cavity to provide multiple lasing modes while the microsphere acts as a loss channel to suppress most of the lasing modes

  • To achieve single mode lasing, the polymer fiber therein serves as an excellent gain μ-cavity to provide multiple lasing modes while the polystyrene microsphere (PSP) acts as a loss channel to suppress most of the lasing modes

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Summary

Introduction

The whispering gallery mode (WGM) microcavity (μ-cavity) lasing with small mode volume and high quality (Q) factor has attracted a lot of attention due to the novel physical properties and potential applications [1,2,3,4,5], such as biochemical and biological sensing [6,7,8,9,10], aerostatic. Can be achieved by a coupled cavity in which one μ-cavity serves as gain cavity to provide multiple lasing resonant modes, and the other μ-cavity can act as a loss channel to suppress most of the lasing modes. To achieve single mode lasing, the polymer fiber therein serves as an excellent gain μ-cavity to provide multiple lasing modes while the PSP acts as a loss channel to suppress most of the lasing modes. The polymer fiber can serve as a WGM μ-cavity to support multiple lasing modes within its gain band while the PSP can act as a loss channel to suppress most of the lasing modes in the coupled system.

Fabrication of the RGB WGM laser
Conclusions

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