Issue 22, 2016

Integrative optofluidic microcavity with tubular channels and coupled waveguides via two-photon polymerization

Abstract

Miniaturization of functional devices and systems demands new design and fabrication approaches for lab-on-a-chip application and optical integrative systems. By using a direct laser writing (DLW) technique based on two-photon polymerization (TPP), a highly integrative optofluidic refractometer is fabricated and demonstrated based on tubular optical microcavities coupled with waveguides. Such tubular devices can support high quality factor (Q-factor) up to 3600 via fiber taper coupling. Microtubes with various diameters and wall thicknesses are constructed with optimized writing direction and conditions. Under a liquid-in-tube sensing configuration, a maximal sensitivity of 390 nm per refractive index unit (RIU) is achieved with subwavelength wall thickness (0.5 μm), which offers a detection limit of the devices in the order of 10−5 RIU. Such tubular microcavities with coupled waveguides underneath present excellent optofluidic sensing performance, which proves that TPP technology can integrate more functions or devices on a chip in one-step formation.

Graphical abstract: Integrative optofluidic microcavity with tubular channels and coupled waveguides via two-photon polymerization

Supplementary files

Article information

Article type
Paper
Submitted
14 Sep 2016
Accepted
10 Oct 2016
First published
10 Oct 2016

Lab Chip, 2016,16, 4406-4414

Integrative optofluidic microcavity with tubular channels and coupled waveguides via two-photon polymerization

Y. Li, Y. Fang, J. Wang, L. Wang, S. Tang, C. Jiang, L. Zheng and Y. Mei, Lab Chip, 2016, 16, 4406 DOI: 10.1039/C6LC01148A

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