上海交通大学机械与动力工程学院机械系统与振动国家重点实验室，上海 200240
激光驱动微滴前向转移工艺在三维金属微结构打印方面具有重要的应用前景。脉冲宽度是影响微滴转移行为的一个重要因素，但是目前的研究对于不同脉宽下微滴产生以及沉积行为认识不够充分。本文以500 nm铜膜为对象，开展了5种不同脉宽下激光驱动微滴前向转移实验。研究结果表明，随着脉冲宽度的增大，获得完整微滴的激光驱动微滴前向转移工艺最低以及最高能流密度阈值逐渐增高，同时脉宽对沉积微滴形貌有显著影响。根据实验确定了不同脉宽下的激光驱动微滴前向转移工艺区间，并统计了不同脉宽下微滴沉积的材料转移比率。最后利用振镜线扫描方式实现大面积微滴阵列的制备。
激光器与激光光学 微滴增材制造 脉冲宽度 激光诱导 金属微滴 激光与光电子学进展
2023, 60(19): 1914001
为了降低微流分析成本，该文提出了基于智能手机检测压电基片上目标微液滴方法，并开发出相应的应用软件，通过分析微液滴颜色信息和几何信息定位目标微液滴位置，结合分析时间获取微液滴输运速度。为验证提出方法的正确性，以5 μL黑色墨水溶液微液滴为研究对象，进行压电基片上微液滴识别和位置分析实验。结果表明，该文所提方法和开发的应用软件可识别和定位压电基片上微液滴，在功率为27, 5 dBm时，第2~10 s段内微液滴输运速度为0, 416 mm/s。
智能手机 微液滴 识别 定位 压电基片 smartphone microdroplet identify sensing position piezoelectric substrate
Author Affiliations
Abstract
1 Key Laboratory of In-fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China
2 State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
3 Department of Physics, College of Science, Shantou University, Shantou 515063, China
In this Letter, a dye-doped cholesteric liquid crystal (DDCLC)-filled hollow glass microsphere is demonstrated to be a resonator with good temperature response. A diglycerol layer is used to wrap the DDCLCs microdroplet to keep it steady and control its orientation. The whispering gallery mode (WGM) lasing and photonic band gap (PBG) lasing caused by two different mechanisms were obtained under the pump of a pulsed laser, and the temperature response of these two kinds of lasing was studied. For the liquid crystal and chiral material used in this Letter, both the WGM lasing and the PBG lasing have a blue shift in wavelength with increasing temperature.
cholesteric liquid crystal microdroplet lasing emission whispering gallery mode Chinese Optics Letters
2020, 18(1): 011402
