Reconfigurable elastomeric graded-index optical elements controlled by light
Reconfigurable elastomeric graded-index optical elements controlled by light
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DOI：
10.1038/s41377-018-0005-1
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发表时间：
2018-05-23
影响因子：
19.4
通讯作者：
Descrovi, Emiliano
中科院分区：
文献类型：
--
作者：
Angelini, Angelo;Pirani, Federica;Descrovi, Emiliano
在许多光学应用中，对动态可调光学元件的需求越来越大，这些光学元件能够“按需”塑造光的波前。在这项工作中，展示了一种易于制造的弹性体光学元件，其传输功能可以由可见光可逆地配置相位。适当的偶氮聚合物纳入弹性基体的光响应性被利用，以诱导光控渐变折射率（GRIN）分布内的大块化合物。诱导折射率的分布是连续的，并与中等功率下的照明强度分布呈保形。结果表明，100 mW双频Nd:YAG高斯光束聚焦到650 μ m的束腰，在弹性基体中引起的最大相对折射率变化约为0.4%，呈近似抛物线型。弹性矩阵的恢复特性使入射激光关闭后几秒钟内完全恢复到初始均匀的折射率分布。作为示例性应用，可配置GRIN元件用于基于显微镜的成像系统，用于有效焦距的光控制。
In many optical applications, there is an increasing need for dynamically tunable optical elements that are able to shape the wavefront of light 'on demand'. In this work, an elastomeric easy-to-fabricate optical element whose transmission functions can be reversibly phase configured by visible light is demonstrated. The light responsivity of proper azopolymers incorporated within an elastomeric matrix is exploited to induce a light-controlled graded refractive index (GRIN) distribution within the bulk compound. The induced refractive index distribution is continuous and conformal to the intensity profile of the illumination at moderate power. A 100 mW doubled-frequency Nd:YAG Gaussian beam focused to a 650 mu m waist is shown to induce a maximum relative refractive index change of similar to 0.4% in the elastomeric matrix, with an approximately parabolic profile. The restoring characteristics of the elastomeric matrix enable full recovery of the initial homogeneous refractive index distribution within a few seconds when the incident laser is switched off. As an exemplary application, the configurable GRIN element is used in a microscope-based imaging system for light control of the effective focal length.