Journal
PHYSICAL REVIEW APPLIED
Volume 7, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.7.034005
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Funding
- Engineering and Physical Sciences Research Council (EPSRC)
- European Union
- Leverhulme Trust
- Royal Society
- Office of Naval Research [N00014-13-1-0596]
- Engineering and Physical Sciences Research Council [1532833] Funding Source: researchfish
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Here, we investigate the mechanism of a random-lasing-based sensor which shows pH sensitivity exceeding by 2 orders of magnitude that of a conventional fluorescence sensor. We explain the sensing mechanism as related to gain modifications and lasing-threshold nonlinearities. A dispersive diffusive lasing theory matches the experimental results well, and it allows us to predict the optimal sensing conditions and a maximal sensitivity as large as 200 times that of an identical fluorescence-based sensor. The lack of complex alignment and the high sensitivity make this mechanism promising for future biosensing applications.
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