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. 2018 Jul 25;11(8):1283. doi: 10.3390/ma11081283

Figure 3.

Figure 3

Waveguides made of natural materials. (a) Silk optical waveguide. Reproduced with permission [34]. Copyright 2010, Wiley-VCH. (b) Tools to analyze transverse faces of waveguides. Reproduced with permission [34]. Copyright 2010, Wiley-VCH. (c) Scanning electron microscopic (SEM) image of a silk fiber. Reproduced with permission. [54] Copyright 2013, AIP. (d) Micro-beam profile of a spider silk fiber. Reproduced with permission. [54] Copyright 2013, AIP. (e) An implanted silk optical fiber in tissue. Reproduced with permission. [51] Copyright 2015, OSA. (f) Comparison of light penetration in different waveguides. Reproduced with permission [55]. Copyright 2017, ACS.