Journal
ADVANCED MATERIALS
Volume 30, Issue 32, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201801481
Keywords
dark-field sensors; lead halide perovskites; microlasers; nanoparticle detection
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Funding
- Shenzhen Fundamental research projects [JCYJ20160427183259083]
- public platform for fabrication and detection of micro- and nanosized aerospace devices
- Shenzhen Engineering Laboratory on organic-inorganic perovskite devices
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The detection of nanoscale objects is essential for homeland security, environmental monitoring, and early-stage diagnostics. In the past few years, optical sensors have mostly been developed with passive devices such as microcavity and plasmonic nanostructures, which require external laser sources to operate and significantly increase the costs and bulks of sensing systems. To date, the potential of their active counterparts in optical sensors has not been well explored. Herein, a novel and robust mechanism to detect nanoscale objects with lead halide perovskite microlasers is demonstrated. Nanoparticles can be simply detected and sized by measuring the intensity of scattered laser light. In principle, the proposed concept is also applicable to electrically driven microlasers and it could find applications in portable point-of-care devices.
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