Open AccessDesign of an optofluidic diffusion sensor by transient grating using dielectrophoresis
Author(s) -
Makoto Kamata,
Yoshihiro Taguchi,
Yuji Nagasaka
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.016970
Subject(s) - materials science , dielectrophoresis , optoelectronics , grating , diffusion , optics , transient (computer programming) , laser , refractive index , raman spectroscopy , nanotechnology , physics , microfluidics , computer science , thermodynamics , operating system
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.