Multi-functional, optofluidic, in-plane, bi-concave lens: Tuning light beam from focused to divergent

Chaolong Song, Nam Trung Nguyen, Yit Fatt Yap, Trung Dung Luong, Anand Krishna Asundi

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


The miniaturization and integration of in-plane micro-lenses into microfluidic networks for improving fluorescence detection has been widely investigated recently. This article describes the design and demonstration of an optofluidic in-plane bi-concave lens to perform both light focusing and diverging. The concave lens is hydrodynamically formed in a rectangular chamber with a liquid core liquid cladding (L2) configuration. In the focusing mode, an auxiliary cladding stream is introduced to sandwich the L 2 configuration for protecting the light rays from scattering at the rough chamber wall. In the diverging mode, the auxiliary cladding liquid changes its role from avoiding light-scattering to being the lowrefractive- index cladding of the lens. The focal length in the focusing mode and the divergent angle of light beam in the diverging mode can be tuned by adjusting the flow rate ratio between core and cladding streams.

Original languageBritish English
Pages (from-to)671-678
Number of pages8
JournalMicrofluidics and Nanofluidics
Issue number3
StatePublished - Mar 2011


  • Beam diverging
  • Beam focusing
  • Bi-concave lens
  • Laser sheet
  • Liquid lens
  • Micro optofluidics


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