Generation of Aspherical Optical Lenses via Arrested Spreading and Pinching of a Cross-Linkable Liquid
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- 作者：Abhijit Chandra Roy ; Mridul Yadav ; Edward Peter Arul ; Anubhav Khanna ; Animangsu Ghatak
- 刊名：Langmuir
- 出版年：2016
- 出版时间：May 31, 2016
- 年：2016
- 卷：32
- 期：21
- 页码：5356-5364
- 全文大小：596K
- 年卷期：0
- ISSN：1520-5827
文摘
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.