Microfluidic droplet grating for reconfigurable optical diffraction

A. Q. Liu, J. Q. Yu, Y. Yang, L. K. Chin, Xuming Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

41 Citations (Scopus)


This Letter presents a reconfigurable optical diffraction grating using multiphase droplets on a microfluidic chip. The uniform and evenly spaced circular droplets are generated by continuously dispersing two immiscible liquids into a T junction to produce plugs, which are then transformed into a circular shape at a sudden expansion of the microchannel. In experiments, the droplet grating shows a detection limit of ∼6.3 × 10-5 when used as an optofluidic refractometer and produces different colors as a color filter. Such a grating has the advantages of high stability and wide tunability in droplet size, grating period, and refractive index, making it promising for biochemical and bio- material applications.
Original languageEnglish
Pages (from-to)1890-1892
Number of pages3
JournalOptics Letters
Issue number11
Publication statusPublished - 1 Jun 2010

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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