Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 27, Pages 17028-17032Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b05385
Keywords
microlenses; laser direct write; photopolymerization; microscopy; laser-induced forward transfer
Funding
- Compagnia di San Paolo [SIME 2015-0682]
- MINECO of the Spanish Government [TEC2014-54544-C2-1-P]
- Fondo Europeo de Desarrollo Regional
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We report a laser-based approach for the fast fabrication of high-optical-quality polymeric microlenses and microlens arrays with controllable geometry and size. Our strategy consists of the direct laser printing of microdroplets of a highly viscous UV prepolymer at targeted positions, followed by photocuring. We study the morphological characteristics and imaging performance of the microlenses as a function of the substrate and laser parameters and investigate optimal printing conditions and printing mechanisms. We show that the microlens size and focusing properties can be easily tuned by the laser pulse energy, with minimum volumes below 20 fL and focal lengths ranging from 7 to SO mu m.
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