Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 36, Issue 3, Pages 819-824Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2017.2762696
Keywords
Biosensor; humidity; hydrogel; microlaser; WGM
Funding
- National Basic Research Program of China [2014CB921302]
- National Natural Science Foundation of China [61625501, 61235003, 61427816, 61590930]
- State Key Laboratory of High Field Laser Physics
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Optical microcavities have been widely employed for sensing and detection, because of their ultrasensitive responsiveness to surrounding environment. Here we report an active disk-shaped whispering gallery mode (WGM) microcavity fabricated from a water-sensitive material of dye-doped PEG-DA hydrogel through two-photon polymerization. We demonstrate that as the environment humidity changes the microcavity can homogenously expand or shrink to keep the disk-shaped structure, producing stable WGM lasing emissions. We further show that the WGM wavelength of the microlaser shifts linearly as the humidity increases from 25% to 65%, resulting in a wavelength variation of about 1.72 nm, which indicates that the stretchable microlaser can be acted as a humidity sensor. Due to the smart response of humidity and biocompatibility of PEG-DA hydrogel material, our results provide a way to the design and fabrication of flexible PEG-DA hydrogel biochips for biomedical applications.
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