摘要
微型化定向光源在集成光子学领域备受关注,随机激光器因其无谐振腔约束的特性,使其在开发低相干多色光源领域显示出独特优势。但传统随机激光体系的发射光束通常因光子无序散射导致发散严重,使其难以适配光纤传感等需精准导光的应用场景。本文提出了一种制备方法简单、成本低、稳定性高的光纤集成金纳米岛-量子点结构的定向随机激光器设计方案。通过优化金属薄膜厚度和退火工艺,在光纤侧面构建了稳定的金纳米岛并实现了黄色随机激光输出,并将激光线宽压缩至4.5 nm,且泵浦阈值低于0.72 mJ/cm^(2)。量子点薄膜与光纤波导的结合能够引导随机激光沿轴向传播,使激光在光纤中传播10 cm以上仍能被检出。光纤基底的特性使这种器件兼具高方向性输出与柔性,为开发高稳定性、可集成化的随机激光器提供了新思路。
Micro-miniaturized directional light sources have garnered significant attention in the field of integrated photonics.Random lasers,due to their characteristic absence of resonant cavity constraints,possess unique advantages in the development of low-coherence,multi-color light sources.However,the emission beams of conventional random laser systems typically suffer from severe divergence due to the random scattering of photons,which makes them unsuitable for applications such as fiber-optic sensing that requiring precise light guidance.A design scheme for an optical fiber-integrated Au nanoislands-quantum dots-structured directional random laser which is easy fabricating,low-cost,and highly stable was proposed.By optimizing the thickness of the metal film and the annealing process,stable Au nanoislands were constructed on the side surface of the optical fiber.Yellow random lasing is achieved on the side surface of the optical fiber,and the laser linewidth is compressed to 4.5 nm,with a pump threshold lower than 0.72 mJ/cm^(2).The combination of the quantum dot film with the optical fiber waveguide can guide the random laser to propagate along the axial direction,allowing the laser to be detected even after propagating more than 10 cm within the optical fiber.The characteristics of the optical fiber substrate endow the device with both high-directionality output and flexibility,offering a new approach for the development of highly stable and integrable random lasers.
作者
许浩飞
张健
Xu Haofei;Zhang Jian(School of Instrumentation Science and Opto-Electronics Engineering,Beijing Information Science and Technology University,Beijing 100192,China)
出处
《微纳电子技术》
2025年第9期49-56,共8页
Micronanoelectronic Technology
基金
国家自然科学基金青年科学基金(9011923202)。
关键词
随机激光
金纳米岛
量子点
局域表面等离子体共振
光纤波导
random laser
Au nanoisland
quantum dot
localized surface plasmon resonance
optical fiber waveguide
