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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Stretch-tuneable dielectric mirrors and optical microcavities.

Mathias Kolle1, Bo Zheng, Nicholas Gibbons

  • 1Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK.

Optics Express
|April 15, 2010
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Summary

Researchers created tuneable optical devices using stretchable rubbers. Stretching these materials alters their structure, enabling color tuning for applications like micro-lasers and strain sensors.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Polymer Science

Background:

  • Distributed Bragg Reflectors (DBRs) and micro-cavities are crucial optical components.
  • Existing methods for tuning these structures can be complex or limited in range.
  • The development of stretchable and tuneable optical materials is an active area of research.

Purpose of the Study:

  • To demonstrate the fabrication of tuneable DBRs and resonant micro-cavities using scalable layer assembly of specific elastomers.
  • To investigate the effect of mechanical stretching on the optical properties of these devices.
  • To explore potential applications in tuneable micro-lasers and optical strain sensing.

Main Methods:

  • Scalable layer assembly of polydimethylsiloxane and polystyrene-polyisoprene rubbers.
  • Fabrication of DBRs and micro-cavities using the assembled layers.
  • Mechanical stretching of the devices by over 60% to induce affine contraction of layer thicknesses.
  • Characterization of optical modes (DBR and cavity modes) across the visible spectrum.

Main Results:

  • Successfully fabricated tuneable DBRs and resonant micro-cavities from stretchable polymers.
  • Demonstrated that stretching the devices by >60% tunes DBR and cavity modes across the entire visible spectrum.
  • Observed an affine contraction of layer thicknesses upon stretching, correlating with optical tuning.

Conclusions:

  • Stretchable elastomers offer a scalable route to fabricating tuneable optical cavities.
  • These devices provide rapid, reversible tuning of optical modes via mechanical strain.
  • Potential applications include tuneable micro-lasers and quantitative optical strain sensing.