Dependence of focal position on the microscale spherical lens imaging

作者：Cao Lingling; Ye Yong Hong^*; Yao Ling; Guo Minglei

来源：Optics Communications, 2015, 353: 184-188.

DOI：10.1016/j.optcom.2015.05.022

• Microspheres
• Semi-immersed
• Full-immersed
• Super-resolution imaging

In this paper, hexagonal close-packed colloidal crystal samples are prepared by a self-assembly method. The image properties of three kinds of microspheres (silica, polystyrene and barium titanate glass) on the colloidal samples are studied. These microspheres are placed in air, semi-immersed and full-immersed in ethanol respectively. We find that all these microspheres can magnify the colloidal crystal samples and have the super-resolution imaging ability. Our experimental results indicate that the position of the focal point of the microsphere can affect the super-resolution imaging property, therefore microspheres with different material need different observing ways to get the best imaging quality. The silica microspheres and the polystyrene microspheres need semi-immersion, while the barium titanate glass microspheres need full-immersion to make the focal point close to the microsphere, so that the best imaging quality can be obtained. The mechanisms are also discussed with numerical simulations.

• 出版日期2015-10-15
• 单位南京师范大学