Journal
OPTICS EXPRESS
Volume 17, Issue 23, Pages 21271-21279Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.17.021271
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- U.S. Army Research Laboratory
- U. S. Army Research Office [W911 NF-07-1-0618]
- DARPA-DSO
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We demonstrate controllable structural color based on periodic nanopatterned 2D lattices in pure protein films of silk fibroin. We show here periodic lattices in silk fibroin films with feature sizes of hundreds of nanometers that exhibit different colors as a function of varying lattice spacing. Further, when varying the index of refraction contrast between the nanopatterned lattice and its surrounding environment by applying liquids on top of the lattices, colorimetric shifts are observed. The effect is characterized experimentally and theoretically and a simple example of glucose concentration sensing is presented. This is the first example of a functional sensor based on silk fibroin optics. (C) 2009 Optical Society of America
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