A strain-gauge random laser

Ya Ju Lee*, Ting Wei Yeh, P. Nagarjuna, Chieh Chi Tseng, Jui Yun Yi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


We describe a random laser that uses the ZnO nanorods randomly orientated on a flexible polyimide (PI) substrate as disorderedly optical scatterers to stimulate coherent random lasing actions. Repeatable and reversible tuning of spectral emission is demonstrated by exerting a bending strain on the PI substrate, which enables us to activate the random laser on either below or above the lasing threshold. Furthermore, our random laser functions as a stable and durable optical strain gauge with a gauge factor of ≈37.7 ± 5.4 under a bending strain of 40%, which is comparable to that of traditional electrical strain gauges. The study validates that the reported strain-gauge random laser is able to be used in certain fields where the electrical gauge is restricted and the optical gauge is considered to preferable as an alternative solution.

Original languageEnglish
Article number061103
JournalAPL Materials
Issue number6
Publication statusPublished - 2019 Jun 1

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering


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