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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Torsion pendulums are sensitive instruments for measuring small forces and torques.
  • Silk fibers possess unique mechanical properties that have not been fully exploited for precision measurement.

Purpose of the Study:

  • To develop a new class of optical silk torsion pendulums (TOPs) with unprecedented sensitivity.
  • To investigate the ultrasoft twist response of silk fibers in ultrahigh vacuum for metrology applications.

Main Methods:

  • Fabrication of macroscopic microgram TOPs using three distinct silk types.
  • Characterization of TOP sensitivity across six orders of magnitude using optical torques.
  • Measurement of torque velocity sensitivity and optical torsional damping.

Main Results:

  • Achieved zepto-Newton-meter (zNm) sensitivity in optical silk torsion pendulums.
  • Demonstrated a nanoscale diameter capture silk TOP with a torsion constant of approximately 20 fNm/rad.
  • Isolated sub-3.0 ± 0.2 zNm/s torque velocity sensitivity with hour-long integration times.

Conclusions:

  • Silk fibers exhibit an ultrasoft twist response suitable for high-sensitivity torsion pendulums.
  • Silk-based sensors offer a promising, cost-effective platform for real-world ultrasensitive metrology.
  • Future development with silk nanofibrils could lead to sub-yocto-Newton-meter sensitive TOPs.