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Variable-focus cylindrical liquid/liquid microlenses and spherical liquid microlens arrays formed using liquid/liquid interfaces are actuated by thermoresponsive hydrogels (see figure). The shapes of the microlenses are realized by patterning apertures with corresponding shapes. Hydrogels located within microfluidic channels regulate the focal lengths of the microlenses by expanding and contracting, in response to changes in the environmental temperature. Supporting information for this article is available on the WWW under http: //www. wiley-vch. de/contents/jc₂089/2007/c1561ₛ. pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
Dong et al. (Thu,) studied this question.