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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

2.8K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
2.8K

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Related Experiment Video

Updated: Mar 21, 2026

Measurement of Tension Release During Laser Induced Axon Lesion to Evaluate Axonal Adhesion to the Substrate at Piconewton and Millisecond Resolution
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A high-resolution strain-gauge nanolaser.

Jae-Hyuck Choi1, You-Shin No1, Jae-Pil So1

  • 1Department of Physics, Korea University, Seoul 136-701, Korea.

Nature Communications
|May 14, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a flexible nanolaser that precisely measures nanoscale strain. This photonic crystal device offers high-resolution strain sensing and functions as a pH sensor for chemical and biological analysis.

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Area of Science:

  • Photonics
  • Nanotechnology
  • Materials Science

Background:

  • Mechanical compliance is crucial for flexible electronics and mechanosensors.
  • Characterizing nanoscale structural deformation is key to improving device sensitivity and response.
  • Developing precise measurement tools with high resolution for nanoscale deformation remains a challenge.

Purpose of the Study:

  • To report a flexible and stretchable photonic crystal nanolaser sensitive to nanoscale structural alterations.
  • To demonstrate precise strain measurement capabilities of the nanolaser.
  • To explore the nanolaser's potential as a strain-based pH sensor.

Main Methods:

  • Fabrication of a flexible and stretchable photonic crystal nanolaser.
  • Characterization of spectral and modal behaviors under applied strain.
  • Investigation of strain-induced spectral tuning and visualization of strain sign.
  • Integration of the nanolaser into an opto-fluidic system for pH sensing.

Main Results:

  • Demonstrated reversible spectral tuning of ~26 nm in lasing wavelength.
  • Achieved sub-nanometre resolution (<0.6 nm) for strain measurement.
  • Successfully visualized the sign of applied strain (-10% to 12%) through modal symmetry.
  • Validated the nanolaser as a stable and deterministic strain-based pH sensor.

Conclusions:

  • The developed photonic crystal nanolaser offers high-resolution, sensitive strain detection at the nanoscale.
  • The device's ability to visualize strain sign and function as a pH sensor opens new avenues for opto-fluidic systems.
  • This technology has potential applications in advanced flexible electronics, mechanosensing, and chemical/biological analysis.