Study on sputtered a-Si:H for micro optical diffusion sensor using laser-induced dielectrophoresis

Makoto Kamata; Kan Yamada; Yoshihiro Taguchi; Yuji Nagasaka

doi:10.1117/12.2216748

15 March 2016 Study on sputtered a-Si:H for micro optical diffusion sensor using laser-induced dielectrophoresis

Makoto Kamata, Kan Yamada, Yoshihiro Taguchi, Yuji Nagasaka

Proceedings Volume 9760, MOEMS and Miniaturized Systems XV; 97600P (2016) https://doi.org/10.1117/12.2216748
Event: SPIE OPTO, 2016, San Francisco, California, United States

Abstract

In this study, a MEMS sensing device, which is applicable to point-of-care testing (POCT), is developed by integrating an optical manipulation and detection technique. The diffusion coefficient is a parameter, which is sensitive to the size, the construction and the interaction of the sample, thus, the measurement of the diffusion coefficient of the bio-sample, such as proteins, is useful for the clinical diagnosis to detect interactions and conformational changes with high sensitivity. Several diffusion sensing methods have been developed, however, the technique applicable to POCT is not established because of the difficulties due to the requirement of the measurement in a short time and a small sensing device. In this study, in order to realize a high-speed detection (ms ~ s) with small sample volume (~ μl) and small apparatus (tens of cm) without particular preparations, the micro optical diffusion sensor utilizing laser-induced dielectrophoresis (LIDEP), which is a manipulation technique based on optoelectronic tweezers, is developed. The microscale concentration distribution is formed in the microchannel by LIDEP and act as the transient diffraction grating, then, the diffusion phenomenon is optically observed. For these techniques, a photoconductive layer is essential and a hydrogenated amorphous silicon (a-Si:H) deposited by a plasma-enhanced chemical vapor deposition is generally utilized as the layer. In this study, the a-Si:H is deposited using a reactive RF magnetron sputtering method under several conditions, while changing the source gas compositions. The sensing device is fabricated with proposed a-Si:H, and the feasibility study for bio-sample measurement is conducted.

Citation Download Citation

Makoto Kamata, Kan Yamada, Yoshihiro Taguchi, and Yuji Nagasaka "Study on sputtered a-Si:H for micro optical diffusion sensor using laser-induced dielectrophoresis", Proc. SPIE 9760, MOEMS and Miniaturized Systems XV, 97600P (15 March 2016); https://doi.org/10.1117/12.2216748

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