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Updated: Feb 27, 2026

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Random lasing from structurally-modulated silk fibroin nanofibers.

Soocheol Kim1, SungYeun Yang1, Seung Ho Choi2

  • 1School of Mechanical Engineering, Yonsei University, Seoul, 03722, Republic of Korea.

Scientific Reports
|July 5, 2017
PubMed
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Controlling silk fibroin nanofiber alignment enhances light amplification in scaffolds. This structural control correlates with mechanical properties, paving the way for flexible, biocompatible sensors.

Area of Science:

  • Materials Science
  • Optics
  • Biomaterials

Background:

  • Structural arrangement significantly influences wave transport and amplification.
  • Investigating the interplay of structural, optical, and mechanical properties is experimentally challenging due to limited platforms for continuous structural modulation.

Purpose of the Study:

  • To investigate light amplification in Rhodamine B doped silk fibroin (SF) nanofibrous scaffolds.
  • To modulate and examine light amplification by controlling the alignment of SF nanofibers via electrospinning.
  • To explore the optical-structural-mechanical relationships in SF-based structures.

Main Methods:

  • Fabrication of SF nanofibrous scaffolds with controlled nanofiber alignment using electrospinning.
  • Examination of random lasing features as a function of nanofiber structural arrangement.

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  • Optical, structural, and mechanical characterization of the SF scaffolds.
  • Quasi-mode analyses using the finite element method for optical confirmation.
  • In situ measurement of lasing features under tensile loads.

    • Main Results:

    • Aligned SF nanofibers (transition from 3D to quasi-2D) showed enhanced light amplification, including lower lasing thresholds and higher output power.
    • Enhanced optical properties strongly correlated with increased mechanical characteristics (Young's moduli).
    • Finite element method analysis confirmed the observed optical characteristics.
    • Non-contact, in situ measurements demonstrated real-time alternations in lasing features under tensile stress.

    Conclusions:

    • Controlled alignment of silk fibroin nanofibers offers a method to modulate light amplification properties.
    • The study establishes a correlation between the optical and mechanical properties of SF scaffolds.
    • The developed scaffolds show potential for use as flexible and biocompatible sensors due to their tunable lasing behavior and mechanical responsiveness.