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.
ASJC Scopus subject areas
- Materials Science(all)