北京大学未来技术学院,国家生物医学成像科学中心,北京 100871
相干拉曼散射(CRS)技术作为一种重要的无标记化学成像技术,通过相干激发分子协同振动对拉曼散射信号进行增益,显著地提高了成像速度,广泛应用于材料学、生物化学、肿瘤诊断、药代动力学等领域。超快脉冲激光器的出现实现了亚皮秒持续时间的脉冲输出,使得通过脉冲激发实现大量振动模式的同步相干激发成为新的CRS实现途径。从相干拉曼散射基本原理出发,介绍时域相干拉曼散射的主要实现途径,着重讨论时域受激拉曼散射(SRS)和时域相干反斯托克斯拉曼散射(CARS)的最新进展与应用。
拉曼光谱技术 相干拉曼散射 受激拉曼散射 相干反斯托克斯拉曼散射 时域 频域 激光与光电子学进展
2024, 61(6): 0618007
Author Affiliations
Abstract
1 Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Department of Optoelectronic Engineering, Jinan University, Guangzhou 510632, China
2 Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China
3 e-mail: qiuwentao@jnu.edu.cn
4 e-mail: ttguanheyuan@jnu.edu.cn
An all-optical light–control–light functionality with the structure of a microfiber knot resonator (MKR) coated with tin disulfide () nanosheets is experimentally demonstrated. The evanescent light in the MKR [with a resonance of and an extinction ratio (ER) of ] is exploited to enhance light–matter interaction by coating a two-dimensional material nanosheet onto it. Thanks to the enhanced light–matter interaction and the strong absorption property of , the transmitted optical power can be tuned quasi-linearly with an external violet pump light power, where a transmitted optical power variation rate with respect to the violet light power of is obtained. In addition, the MKR structure possessing multiple resonances enables a direct experimental demonstration of the relationship between resonance properties (such as and ER), and the obtained variation rate with respect to the violet light power. It verifies experimentally that a higher resonance and a larger ER can lead to a higher variation rate. In terms of the operating speed, this device runs as fast as . This kind of all-optical light–control–light functional structure may find applications in future all-optical circuitry, handheld fiber sensors, etc.
Photonics Research
2018, 6(12): 12001137