Author Affiliations
Abstract
Key Laboratory of In-Fiber Integrated Optics of Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001, China
We theoretically demonstrate a compact all-dielectric metasurface fiber-tip lens composed of sub-wavelength amorphous silicon on the end face of a multimode fiber. The full 2π phase control was realized by varying the widths of resonant units. The tunable focal length is achieved by using the thermal-optic effect of amorphous silicon. The focal length increases from 309 μm to 407 μm when the temperature changes by 300 K. The temperature controlled all-fiber integrated lens is compact and with high efficiency and provides an excellent platform of a fiber-tip lab. Meanwhile, the proposed fiber lens does not have any structural changes during dynamic tuning, which improves the durability and repeatability of the devices.
fiber-tip lens tunable focus length all-dielectric metasurface thermal-optic effect Chinese Optics Letters
2020, 18(3): 030602
提出一种用于二维(2D)/三维(3D)可切换显示的可变焦的柱状液体透镜阵列，主要包含两种不同折射率的透明液体：液体1和液体2，液体1和液体2被透明的弹性薄膜隔离开，弹性薄膜由微支板阵列来支撑。通过外力驱动两种液体在器件内的流动来实现并调节弹性薄膜的形变，弹性薄膜形变有平面形态和可变柱面形态两种，实现该柱状液体透镜阵列焦距从无穷大到有限正焦距的大范围的变焦。实验制作出适用于2D/3D 切换显示器的样品，实验结果验证了其变焦性能，该样品与匹配的平板显示器能进自由立体3D 显示，而且弹性薄膜能变为平面形态用于普通的2D 显示，实现了2D/3D 切换显示。
光学器件 透镜阵列 液体透镜 变焦 三维显示
