An in-plane optofluidic microchip for focal point control

Kuo Sheng Chao, Meng Shiang Lin, Ruey-Jen Yang

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A polydimethylsiloxane (PDMS) optofluidic microfluidic chip comprising a tunable optofluidic in-plane biconvex microlens and a tunable optofluidic in-plane microprism is proposed for controlling the focal length and deviation angle of a light beam. In the proposed device, the microlens comprises an expansion chamber containing a high refractive index stream sandwiched between two low refractive index streams. Meanwhile, the microprism comprises a triangular chamber filled with two liquids, one with a higher refractive index than that of PDMS and the other a lower refractive index than that of PDMS. It is shown that the radius of curvature (and therefore the focal length) of the microlens can be adjusted by controlling the flow rate ratio of the core and cladding streams. In addition, it is shown that the deviation angle of the light ray exiting the microprism depends on the refractive indices of the two working fluids, the apex angle of the prism chamber, and the flow rate ratio of the two working fluids. In general, the results show that the biconvex microlens enables the focal length to be adjusted in the range of 2.9-7.6 mm when using benzothiazole and ethylene glycol-ethanol as the core and cladding fluids, respectively. Moreover, a deviation angle range of -6.2°to 22.3° can be achieved when using a microprism chamber with an apex angle of 90° and benzothiazole and DI water as the working fluids. The integrated optofluidic chip therefore can manipulate the focal length and deviation angle of a light beam by adjusting the relative flow rates of fluids.

Original languageEnglish
Pages (from-to)3886-3892
Number of pages7
JournalLab on a Chip
Volume13
Issue number19
DOIs
Publication statusPublished - 2013 Oct 7

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Refractometry
Refractive index
Polydimethylsiloxane
Fluids
Flow rate
Light
Microfluidics
Ethylene Glycol
Prisms
Ethylene glycol
Ethanol
Equipment and Supplies
Water
Liquids
baysilon

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Biochemistry
  • Chemistry(all)
  • Biomedical Engineering

Cite this

Chao, Kuo Sheng ; Lin, Meng Shiang ; Yang, Ruey-Jen. / An in-plane optofluidic microchip for focal point control. In: Lab on a Chip. 2013 ; Vol. 13, No. 19. pp. 3886-3892.
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An in-plane optofluidic microchip for focal point control. / Chao, Kuo Sheng; Lin, Meng Shiang; Yang, Ruey-Jen.

In: Lab on a Chip, Vol. 13, No. 19, 07.10.2013, p. 3886-3892.

Research output: Contribution to journalArticle

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