Journal
LAB ON A CHIP
Volume 13, Issue 14, Pages 2701-2707Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3lc50149c
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Funding
- Deutsche Telekom Stiftung
- Karlsruhe House of Young Scientists (KHYS)
- DFG Research Center for Functional Nanostructures (CFN) Karlsruhe
- Karlsruhe Nano Micro Facility (KNMF), a Helmholtz Research Infrastructure at Karlsruhe Institute of Technology (KIT)
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We report on a novel approach to realize on-chip microlasers, by applying highly localized and material-saving surface functionalization of passive photonic whispering gallery mode microresonators. We apply dip-pen nanolithography on a true three-dimensional structure. We coat solely the light-guiding circumference of pre-fabricated poly(methyl methacrylate) resonators with a multifunctional molecular ink. The functionalization is performed in one single fabrication step and simultaneously provides optical gain as well as molecular binding selectivity. This allows for a direct and flexible realization of on-chip microlasers, which can be utilized as biosensors in optofluidic lab-on-a-chip applications. In a proof-of-concept we show how this highly localized molecule deposition suffices for low-threshold lasing in air and water, and demonstrate the capability of the ink-lasers as biosensors in a biotin-streptavidin binding experiment.
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