Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
Key Laboratory of Quantum Information, Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China , Hefei, Anhui 230026, China.
J Am Chem Soc. 2016 Feb 24;138(7):2122-5. doi: 10.1021/jacs.5b12755. Epub 2016 Feb 15.
Nanoscale lasers are ideal light-signal sources for integrated photonic devices. Most of the present lasers made of dielectric materials are restricted to being larger than half the wavelength of the optical field. Plasmon lasers made from metallic nanostructures can help to break the diffraction limit, yet they suffer from low optical pump efficiencies and low quality factors. Integrating dielectric lasers with plasmonic waveguides to construct hybrid material systems may circumvent these problems and combine the advantages of the two components. Here we demonstrate the nanoscale output of dielectric lasers via photon-plasmon coupling in rationally designed perovskite/silver heterostructures. The perovskite crystals offer the gain and high-Q cavity for low-threshold laser generation, while the embedded silver nanowires (AgNWs) help to output the lasing modes efficiently in the form of surface plasmons. The output coupling can be modulated by controlling the resonant modes of the two-dimensional perovskite microcavities. The results would pave an alternative avenue to ultrasmall light sources as well as fundamental studies of light-matter interactions.
纳米尺度激光器是集成光子器件理想的光信号源。目前大多数由介电材料制成的激光器都受到限制，其尺寸必须大于光场半波长。由金属纳米结构制成的等离子体激光器有助于突破衍射极限，但它们的光学泵浦效率和品质因数较低。通过将介电激光器与等离子体波导集成到构建混合材料系统中，可以规避这些问题并结合两种组件的优势。在这里，我们通过在合理设计的钙钛矿/银异质结构中的光子-等离子体耦合，实现了介电激光器的纳米级输出。钙钛矿晶体提供增益和高 Q 腔，以实现低阈值激光产生，而嵌入的银纳米线（AgNWs）则有助于以表面等离子体的形式高效输出激光模式。通过控制二维钙钛矿微腔的共振模式，可以对输出耦合进行调制。这些结果将为超小型光源以及光物质相互作用的基础研究开辟一条替代途径。
