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Mirrorless Cholesteric Lasers Using ESIPT-Based AIE Dyes via a Gain-Structure Decoupling Strategy.

Tae-Woong Moon1, Jae-Jin Lee1, Fumito Araoka2

  • 1Department of Advanced Materials Engineering, Kyung Hee University, Yongin-si, Gyeonggi-do 17104, Republic of Korea.

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Summary
This summary is machine-generated.

We developed a novel mirrorless laser using aggregation-induced emission (AIE) dyes within cholesteric liquid crystal (CLC) photonic structures. This design overcomes limitations of traditional lasers, enabling high efficiency and compact, flexible devices.

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Area of Science:

  • Photonics and Laser Technology
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Traditional dye-doped cholesteric liquid crystal (CLC) lasers suffer from concentration quenching and structural disruption at high dye concentrations.
  • Developing efficient, mirrorless laser systems requires overcoming these limitations for enhanced optical gain and stability.

Purpose of the Study:

  • To engineer a high-efficiency, mirrorless laser system utilizing aggregation-induced emission (AIE) dyes and CLC photonic structures.
  • To implement a gain-structure decoupling strategy to enhance dye loading and optical gain.

Main Methods:

  • Fabrication of nanoporous cholesteric polymer scaffolds using photopolymerization-induced phase separation.
  • Selective removal of nonreactive mesogens to create porous templates.
  • Infiltration of these scaffolds with an excited-state intramolecular proton transfer-type AIE dye.

Main Results:

  • Achieved high dye uptake in porous CLC scaffolds without compromising photonic order, leading to enhanced optical gain.
  • Demonstrated significantly improved output intensity and reduced lasing threshold in post-infiltrated architectures compared to directly doped systems.
  • The decoupled system effectively mitigated concentration quenching and structural disruption.

Conclusions:

  • The gain-structure decoupling strategy using AIE dye-infiltrated CLC photonic structures enables highly efficient mirrorless lasers.
  • This approach provides a robust framework for developing compact, flexible, and polarization-controlled distributed feedback lasers without external mirrors.