Reconfigurable elastomeric graded-index optical elements controlled by light

作     者：Angelo Angelini Federica Pirani Francesca Frascella Emiliano Descrovi 

作者机构：Department of Applied Science and Technology(DISAT)Politecnico di TorinoC.so Duca degli Abruzzi 24Torino IT-10129Italy Center for Sustainable Future Technologies@PoliToIstituto Italiano di TecnologiaC.so Trento 21Torino IT-10129Italy 

出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)

年 卷 期：2018年第7卷第1期

页      面：964-972页

核心收录：

学科分类：0808[工学-电气工程] 080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：from the Italian Flagship Project NANOMAX(Progetto Bandiera MIUR PNR 2011–2013) 

主　　题：optical switched index 

摘      要：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 *** 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 *** induced refractive index distribution is continuous and conformal to the intensity profile of the illumination at moderate power.A 100mW doubled-frequency Nd:YAG Gaussian beam focused to a 650μm waist is shown to induce a maximum relative refractive index change of~0.4%in the elastomeric matrix,with an approximately parabolic *** 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 *** an exemplary application,the configurable GRIN element is used in a microscope-based imaging system for light control of the effective focal length.