Generation of Aspherical Optical Lenses via Arrested Spreading and Pinching of a Cross-Linkable Liquid
| Autor: | Abhijit Chandra Roy, Anubhav Khanna, Edward Peter Arul, Animangsu Ghatak, Mridul Yadav |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Flow (psychology) Context (language use) 02 engineering and technology Substrate (printing) Curvature 01 natural sciences Cylinder (engine) law.invention Physics::Fluid Dynamics 010309 optics Surface tension Optics Sessile drop technique law 0103 physical sciences Electrochemistry General Materials Science Spectroscopy business.industry Drop (liquid) Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 0210 nano-technology business |
| Zdroj: | Langmuir. 32:5356-5364 |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | Aspherical optical lenses with spatially varying curvature are desired for capturing high quality, aberration free images in numerous optical applications. Conventionally such lenses are prepared by multistep top-down processes which are expensive, time-consuming, and prone to high failure rate. In this context, an alternate method is presented here based on arrested spreading of a sessile drop of a transparent, cross-linkable polymeric liquid on a solid substrate heated to an elevated temperature. Whereas surface tension driven flow tends to render it spherical, rapid cross-linking arrests such flow so that nonequilibrium aspherical shapes are attained. It is possible to tune also the initial state of the drop via delayed pinching of a liquid cylinder which precedes its release on the substrate. This method has led to the generation of a wide variety of optical lenses, ranging from spherical plano convex to superspherical solid immersion to exotic lenses not achieved via conventional methods. |
| Databáze: | OpenAIRE |
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