光学镊子
镊子
数值孔径
俘获
材料科学
光学
极化(电化学)
光电子学
波长
纳米尺度
纳米技术
物理
化学
生态学
物理化学
生物
作者
Dongni Yang,Jianchao Zhang,Pengshuai Zhang,Haowen Liang,Jie Ma,Xuehua Wang,Juntao Li
出处
期刊:Research Square - Research Square
日期:2023-05-30
被引量:1
标识
DOI:10.21203/rs.3.rs-2928386/v1
摘要
Abstract Trapping and manipulating micro-objects and high precision measurement of tiny force and displacements are of significance in physical and biological studies. Conventional optical tweezers rely on a tightly focused beam formed by a bulky microscope system. Currently, flat lenses, especially metalenses, have become emerging platforms for miniature optical tweezers application. Compared to traditional objectives, metalenses can be integrated into the sample chamber, so as to realize chip-scale light manipulation. Here, a transmissive and polarization-insensitive water-immersion metalens constructed by adaptive nano-antennas is experimentally proposed with an ultra-high numerical aperture (1.28) and a high focusing efficiency (~ 50%) at the wavelength of 532 nm. With it, a stable optical trapping has been demonstrated with the lateral trapping stiffness of more than 500 pN/(µm·W), which reaches the same order of magnitude as a conventional objective and shows better performance than other reported flat lenses. In addition, bead steering experiment exhibits lateral manipulation range more than 2 µm, including the region of approximately 0.5 µm with little changes in stiffness. We believe that this metalens enables chip-scale optical tweezers, making optical trapping and manipulating easy, reliable, high-performance and more compatible with prevalent optical tweezers applications such as single-molecule or single-cell experiments.
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