Author Affiliations
Abstract
1 School of Electronic and Electrical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
2 State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
3 Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
4 Collaborative Innovation Center of Light Manipulation and Applications, Shandong Normal University, Jinan 250358, China
Optical frequency conversion based on the second-order nonlinearity () only occurs in anisotropic media (or at interfaces) and thus is intrinsically polarization-dependent. But for practical applications, polarization-insensitive or independent operation is highly sought after. Here, by leveraging polarization coupling and second-order nonlinearity, we experimentally demonstrate a paradigm of TE/TM polarization-independent frequency upconversion, i.e., sum frequency generation, in the periodically poled lithium niobate-on-insulator ridge waveguide. The cascading of quasi-phase-matched polarization coupling and nonlinear frequency conversion is exploited. With a proper transverse electric field, TE and TM mode fundamental waves can be frequency-upconverted with an equal efficiency in the frequency converter. The proposed method may find ready application in all-optical wavelength conversion and upconversion detection technologies.
frequency upconversion polarization coupling lithium niobate on insulator ridge waveguide cascading process Chinese Optics Letters
2023, 21(12): 121901
1 煤炭加工与高效洁净利用教育部重点实验室, 江苏 徐州 221116
2 中国矿业大学化工学院, 江苏 徐州 221116
3 北京大学化学与分子工程学院, 北京 100871
近年来煤基高附加值化学品提取制备的前沿科学研究发现, 黄腐酸平台化合物(FAPC) 作为一类具有特殊功效的团簇族特性组装分子集合体, 在现代农业、 生物医药及功能材料等方面有良好应用前景, 黄腐酸平台化合物制备提取基础理论及化学构成研究具有重要科学意义; 简介了黄腐酸平台化合物基于不同源物质的制备提取方法, 重点阐述了煤基物选择解离规律、 黄腐酸平台化合物特征官能团构成及自组装结构特性的光谱解析, 研究结果表明: 酸碱反应、 离子交换、 生物转化及微波等途径, 可以实现黄腐酸平台化合物选择性制备提取; 通过红外、 核磁共振、 荧光光谱、 电子与振动光谱及分子模拟等手段, 能够从不同光谱谱图特征指认对制备所得黄腐酸平台化合物分子群组分进行分子结构、 官能团、 分子链、 自组装空间构型、 基团结构及构建方式有效检测表征; 多谱图综合揭示黄腐酸平台化合物主要由羧羟基、 酚羟基、 醌基和羰基类分子构成; 选择性解离生成的活性小分子因相关分子特性取向形成自组装集体, 具备界面友好、 微纳米尺寸、 电学储能及良好生物相容性特点; 通过对比分析对黄腐酸平台化合物制备规律进行了优缺点揭示, 并对黄腐酸平台化合物未来理论研究与应用前景做了展望。
黄腐酸 平台化合物 化学构成 光谱 自组装 Fulvic acid Platform compounds Chemical composition Spectrum Self-assembly
Author Affiliations
Abstract
1 State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
2 Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
Stimulated emission can be controlled by a material molecular energy band and the intensity of a pump laser, which can provide some population inversion and promote ground electron transition, respectively. We use a metallic optofluidic resonator to enhance stimulated emission intensity. The quality factor Q and the spontaneous emission coupling factor β of the metallic optofluidic resonator are discussed in detail to explain the enhancement mechanism. Experimental data demonstrate that the operated emission from rhodamin 6G solution can be observed due to the enhancement of stimulated emission from the optofluidic resonator.
Dye lasers Waveguides Resonators Photonics Research
2018, 6(6): 06000597
