Design of an optofluidic diffusion sensor by transient grating using dielectrophoresis

Makoto Kamata, Yoshihiro Taguchi, Yuji Nagasaka

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


An optofluidic diffusion sensor using laser-induced dielectrophoresis in a device with a sputtered a-Si:H layer is presented. Diffusion sensors enabling high-speed measurement have important potential uses as bio-sensors and for quantitative analysis of nano-sized products. The present sensor was developed for measurement in a few seconds by optic observations of the sample diffusion from transient grating formed by laser-induced dielectrophoresis. As a photoconductive layer for the proposed device, we used a sputtered a-Si:H film. The optical (refractive index and extinction coefficient), structural (Raman and IR spectroscopy), and optoelectronic properties of this film, as well as its applicability to the proposed device are characterized. Nano-sized beads were measured by the fabricated device, and its performance as a diffusion sensor was validated.

Original languageEnglish
Pages (from-to)16970-16983
Number of pages14
JournalOptics Express
Issue number13
Publication statusPublished - 2018 Jun 25

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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