发表机构
University of Pennsylvania; University of Palermo; Friedrich-Alexander-Universität Erlangen-Nürnberg（宾夕法尼亚大学; 巴勒莫大学; 埃尔朗根-纽伦堡大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究开发了QD胶体囊，一种液芯/壳超粒子，其可通过触发结构坍塌实现光学响应从腔定义激光到宽带发射的重构，为微激光器及光子标记提供了新平台。
AI 中文摘要
量子点（QD）超粒子激光器是极具潜力的微尺度光源和光子标记平台，但其光学性质在组装时就已确定。本文介绍了QD胶体囊，即液芯/壳超粒子，它将回音壁模式光学反馈与刺激触发的结构坍塌相结合。完整的QD胶体囊呈现出由腔定义的激光特性，其 fluence 阈值约为2.8 mJ/cm²，线宽为2.2-3.7 nm，证明了无需固体核心即可实现高效的光捕获。通过探索包含固体超粒子、胶体囊和微孔空心壳的超结构形态连续体，我们确定壳的连续性是回音壁反馈和激光的关键决定因素：完整的胶体囊支持窄腔模式，而多孔壳即使在高泵浦 fluence 下仍保持宽带特性。我们还表明，胶体囊可通过明确的途径被驱动破裂并释放载荷，包括弯液面驱动的毛细管失效、均匀加热以及局部近红外激活，从而将其光学响应从腔定义的激光重新配置为宽带发射。这些结果确立了QD胶体囊为可重构微激光器，它在单个自组装平台内耦合了光学状态切换和触发释放。
英文摘要
Quantum dot (QD) supraparticle lasers are promising platforms for microscale light sources and photonic labeling, yet their optical properties are set during assembly. Here we introduce QD colloidosomes, liquid-core/solid-shell supraparticles that combine whispering-gallery-mode optical feedback with stimulus-triggered structural collapse. Intact QD colloidosomes show cavity-defined lasing with fluence thresholds of ~2.8 mJ/cm2 and linewidths of 2.2-3.7 nm, demonstrating efficient light trapping without a solid core. We identify shell continuity as a critical determinant for whispering-gallery feedback and lasing by exploring a morphological continuum of suprastructures comprising solid supraparticles, colloidosomes, and microporous hollow shells. Intact colloidosomes support narrow cavity modes, whereas porous shells remain broadband even at high pump fluence. We show that colloidosomes can be driven to rupture and release payload through well-defined pathways, including meniscus-driven capillary failure, uniform heating, and localized near-infrared activation, thereby reconfiguring their optical response from cavity-defined lasing to broadband emission. These results establish QD colloidosomes as reconfigurable microlasers that couple optical-state switching and triggered release within a single self-assembled platform.
