纳米共轴腔表面等离激元激光器的设计制作和机理研究

The developing of photonics integration technology calls for integratable nanolasers. However, it is still challenging to design a nano-laser which can be applied to integrated optical circuits. Physical mechanisms involved in nanoscale lasers are still not very clear and need further investigation. In this project, a kind of nanoscale lasers based on mechanism of surface plasmon amplification by stimulated emission of radiation are proposed. This kind of nanolasers are composed of a coaxial cavity and gain materials infiltrated in it. Its lasing wavelength can range from visible to infrared. Most importantly, they can be integrated on chips with high efficiency..Employing improved nanosphere lithography method, coaxial cavities with tunable geometry size can be mass produced. Nanolasers with varied working wavelength will be fabricated by adjusting the cavity geometry sizes and using appropriate gain materials. A model related to energy transfer efficiency between cavity plasmonic modes and excited gain materials in cavity will be established according to simulation results and experimental data. Experimentally investigation of the main factors that influence pump threshold, linewidth and emission power of this kind of nano-lasers. The proposed nano-lasers show advantages in low fabrication cost, high efficiency for integration fabrication, good reproducibility and tunable lasing wavelengths, which makes them good candidate for optical source in integrated optical circuits, active sensors, high resolution display or print and information storage. .Members in our group are experienced in nanosphere lithography method, principles of plasmonics and laser design and fabrication, which makes us capable to accomplish the works of this project.

纳米尺度激光光源作为光子集成技术中的核心器件，其设计和集成制作还是一个难题，且其物理机制尚不完全清晰，需要结合实验深入研究。本课题拟采用纳米共轴腔结构，填充增益介质，基于表面等离激元受激辐射放大机制，设计并制作波长在可见-近红外波段连续可调的纳米激光器。研究内容涵盖以下三点：（1）采用改进的纳米球印刷法制作结构尺寸连续可调的纳米共轴腔，通过调节腔的尺寸和改变增益介质，设计制作多种波长的纳米激光器；（2）建立纳米共轴腔内表面等离激元和增益介质之间的能量转移效率的理论模型；（3）改变材料和结构参数，研究共轴腔纳米激光器阈值、线宽和功率的主要影响因素。课题组在纳米球印刷制造、表面等离激元机理、激光原理和设计等方面有丰富的研究经验。本项目设计制作的纳米激光器具有波长连续可调，可高效率集成制作，制造成本低，可重复性好等优点，可应用于光子集成光源、光电有源传感、高分辨率显示、信息存储等领域。

纳米尺度激光光源作为光子集成技术中的核心器件，其设计和集成制作是关键技术。本课题采用纳米共轴腔结构，填充增益介质，基于表面等离激元受激辐射放大机制，设计并制作波长在可见-近红外波段连续可调的纳米激光器。研究内容涵盖以下三点：（1）研究纳米共轴腔的可控制备，提出两种结构的纳米共轴腔——嵌入式和凸出式，环形腔尺寸最小能小于200 nm，腔狭缝小于10 nm，高度约100 nm。分析这两种结构的光学性质，研究增益介质的填充方案和效果；（2）研究周期性金属结构表面等离激元寿命的影响因素；（3）以及泵浦光的超振荡聚焦平面透镜的设计和制作，这种透镜可以提高纳米激光器阵列的利用率，以及减小光斑。本项目设计制作的纳米激光器具有波长连续可调，可高效率集成制作，制造成本低，可重复性好等优点，可应用于光子集成光源、光电有源传感、高分辨率显示、信息存储等领域。

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