Femtosecond Laser Fabrication of Cavity Microball Lens (CMBL) inside a PMMA Substrate for Super-Wide Angle Imaging.
Femtosecond Laser Fabrication of Cavity Microball Lens (CMBL) inside a PMMA Substrate for Super-Wide Angle Imaging.
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DOI：
10.1002/smll.201403419
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发表时间：
2015-07
期刊：
影响因子：
13.3
通讯作者：
Chong Zheng;Chong Zheng;Anming Hu;Anming Hu;K. Kihm;Qian Ma;Ruo-Zhou Li;Ruo-Zhou Li;
中科院分区：
文献类型：
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作者：
Chong Zheng;Chong Zheng;Anming Hu;Anming Hu;K. Kihm;Qian Ma;Ruo-Zhou Li;Ruo-Zhou Li;
由于迄今为止微透镜主要通过表面制造来制造，因此它们非常容易受到表面损伤，并且它们的微尺度尺寸使得处理起来很麻烦。因此，腔透镜是优选的，因为它们减轻了与表面制造的微透镜相关联的这些困难。在这里，它表明，高重复飞秒激光可以有效地制造腔微球透镜（CMBLs）内的聚甲基丙烯酸甲酯切片。最佳的CMBL制造条件是通过检查相关的参数，包括激光处理时间，平均照射功率，和脉冲重复频率来确定。此外，开发了热扩散模型，以更好地理解球形空腔和空腔周围的轻微压缩影响区的形成。由显微物镜和CMBL组成的显微望远镜展示了超宽视场成像能力。最后，详细的光学特性的CMBLs阐述占受影响区域的折射率变化。在目前的研究中提出的结果表明，飞秒激光制造的CMBL可以用于强大的和超宽视角的显微成像应用。
Since microlenses have to date been fabricated primarily by surface manufacturing, they are highly susceptible to surface damage, and their microscale size makes it cumbersome to handle. Thus, cavity lenses are preferred, as they alleviate these difficulties associated with the surface-manufactured microlenses. Here, it is shown that a high repetition femtosecond laser can effectively fabricate cavity microball lenses (CMBLs) inside a polymethyl methacrylate slice. Optimal CMBL fabrication conditions are determined by examining the pertinent parameters, including the laser processing time, the average irradiation power, and the pulse repetition rates. In addition, a heat diffusion modeling is developed to better understand the formation of the spherical cavity and the slightly compressed affected zone surrounding the cavity. A micro-telescope consisting of a microscope objective and a CMBL demonstrates a super-wide field-of-view imaging capability. Finally, detailed optical characterizations of CMBLs are elaborated to account for the refractive index variations of the affected zone. The results presented in the current study demonstrate that a femtosecond laser-fabricated CMBL can be used for robust and super-wide viewing micro imaging applications.