Strain-tunable optical microlens arrays with deformable wrinkles for spatially coordinated image projection on a security substrate  

作　　者：In Sik Choi Seongho Park Sangheon Jeon Young Woo Kwon Rowoon Park Robert A.Taylor Kwangseuk Kyhm Suck Won Hong 

机构地区：[1]Department of Cogno-Mechatronics Engineering,Department of Optics and Mechatronics Engineering,Pusan National University,Busan 46241,Republic of Korea [2]Research Center for Dielectric and Advanced Matter Physics,Pusan National University,Busan 46241,Republic of Korea [3]Department of Physics,University of Oxford,Oxford OX13PU,UK [4]Department of Nano-Fusion Technology,Pusan National University,Busan 46241,Republic of Korea

出　　处：《Microsystems & Nanoengineering》2022年第5期225-237,共13页微系统与纳米工程（英文）

基　　金：supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(No.NRF-2021R1A5A1032937);a grant of the Korea Health Technology R&D Project through the Korea Health Industry Development Institute(KHIDI),funded by the Ministry of Health&Welfare,Republic of Korea(grant number:HI19C1085).

摘　　要：As a new concept in materials design,a variety of strategies have been developed to fabricate optical microlens arrays(MLAs)that enable the miniaturization of optical systems on the micro/nanoscale to improve their characteristic performance with unique optical functionality.In this paper,we introduce a cost-effective and facile fabrication process on a large scale up to~15 inches via sequential lithographic methods to produce thin and deformable hexagonally arranged MLAs consisting of polydimethylsiloxane(PDMS).Simple employment of oxygen plasma treatment on the prestrained MLAs effectively harnessed the spontaneous formation of highly uniform nanowrinkled structures all over the surface of the elastomeric microlenses.With strain-controlled tunability,unexpected optical diffraction patterns were characterized by the interference combination effect of the microlens and deformable nanowrinkles.Consequently,the hierarchically structured MLAs presented here have the potential to produce desirable spatial arrangements,which may provide easily accessible opportunities to realize microlens-based technology by tunable focal lengths for more advanced micro-optical devices and imaging projection elements on unconventional security substrates.

关 键 词：PROJECTION ARRAYS spatially 

分 类 号：TH74[机械工程—光学工程]