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. Author manuscript; available in PMC: 2019 Aug 1.
Published in final edited form as: Adv Mater. 2018 Jun 26;30(32):e1801584. doi: 10.1002/adma.201801584

Figure 2. Geometrical design and mechanical analysis of flexible silicon transient optical waveguides.

Figure 2.

(a)-(c) Finite element analysis (FEA) results and optical images of the process of unfurling structures with zigzag and spiral shapes (Configuration I-III). Left column: Schematic illustration with key dimensions in the undeformed state. The Si core (width and thickness 50 μm and 1500 nm, respectively) lies at neutral plane of the PLGA cladding (thickness 20 μm). Unfurling strain: the ratio of the total end-to-end distance of the unfurled structure to the overall length of the Si core. (a) Configuration I, zigzag waveguide with 4 turning corners. The thickness, width and length of the Si core are 1500 nm, 50 μm and 20.9 cm, respectively. (b) Configuration II, zigzag waveguide with 14 turning corners. Thickness, width and length of the Si core are 1500 nm, 50 μm and 54.4 cm, respectively. (c) Configuration III, spiral waveguide, with base radius 1.5 mm, top radius 8.5 mm, and 3 turns. Thickness, width and length of the Si core are 1500 nm, 50 μm and 7.3 cm, respectively.