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Biocompatible silk step-index optical waveguides.

Matthew B Applegate1, Giovanni Perotto1, David L Kaplan1

  • 1Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA.

Biomedical Optics Express
|November 25, 2015
PubMed
Summary
This summary is machine-generated.

Researchers created flexible, biocompatible optical waveguides entirely from silk fibroin. These silk waveguides can guide light through biological tissues with low propagation loss.

Keywords:
(160.1435) Biomaterials(160.5470) Polymers(170.3890) Medical optics instrumentation(230.7370) Waveguides

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Area of Science:

  • Biomaterials Science
  • Optical Engineering
  • Biomedical Devices

Background:

  • Silk fibroin is a natural polymer with excellent biocompatibility and mechanical properties.
  • Development of biocompatible optical waveguides is crucial for in-vivo biomedical applications.
  • Existing waveguide fabrication methods often involve harsh chemicals and complex processes.

Purpose of the Study:

  • To develop novel, biocompatible optical waveguides using only silk fibroin.
  • To evaluate the optical and mechanical properties of silk fibroin waveguides.
  • To demonstrate the feasibility of guiding light through biological tissues using silk waveguides.

Main Methods:

  • Silk fibroin films and hydrogels were fabricated.
  • A core-cladding structure was created by encapsulating a silk film within a silk hydrogel.
  • Light was coupled into the waveguides using an integrated glass optical fiber.
  • Propagation losses were measured using the cutback method.

Main Results:

  • Robust and flexible silk fibroin waveguides were successfully constructed.
  • The waveguides exhibited a refractive index contrast suitable for light propagation (n_core=1.54, n_cladding=1.34).
  • Propagation losses were measured at approximately 2 dB/cm.
  • The silk waveguides demonstrated the ability to guide light through biological tissue.

Conclusions:

  • Silk fibroin is a suitable material for fabricating biocompatible optical waveguides.
  • The developed silk waveguides offer a promising, eco-friendly alternative for biomedical optics.
  • These waveguides have potential applications in minimally invasive diagnostics and therapeutics.