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Proceedings Paper

Tantalum oxide bio-photonics thin film grown by Gas-timing innovation technique
Author(s): N. Khemasiri; S. Porntheeraphat; M. Horprathum; C. Chananonnawathorn; W. Bunjongpru; D. Phromyothin; S. Pratontep; J. Nukeaw
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Paper Abstract

Tantalum oxide (TaxOy) as high refractive index material has been grown on p-type silicon and quartz substrates by R.F. magnetron sputtering with our innovative technique called “reactive-gas timing”. The reactive gas timing technique is an on-off time period sequence between argon (Ar) and oxygen (O2) plasma during sputtering process. The technique of gas-timing plays the effect on the properties of TaxOy thin film. The bombarded Ar-plasma was varied at 2, 5 and 8 sec, while the period of reactive O2-plasma was kept at 5 sec in this experiment. The physical and optical properties were investigated by using X-ray diffraction (XRD), Atomic Force Microscope (AMF), UV-Visible spectrometer and Spectroscopic Ellipsometer, respectively. The XRD spectra and AFM photographs show all films are amorphous phase with smooth feature. Meanwhile the transmittance of sputtered thin film decreases with 10% and the absorption edge shifts to lower energy with the increasing of the argon period from 2 sec to 8 sec. The refractive index as showed by ellipsometry slightly increases from 2.08 to 2.17 at wavelength 550 nm with the increasing of argon period from 2 sec to 8 sec. The increasing of the refractive index might dues to tantalum (Ta) rich which consists in thin films. The Ar-plasma period in the deposited film plays an important role on the properties of the TaxOy thin films especially as optical refractive index material.

Paper Details

Date Published: 7 June 2013
PDF: 7 pages
Proc. SPIE 8883, ICPS 2013: International Conference on Photonics Solutions, 88830B (7 June 2013); doi: 10.1117/12.2022096
Show Author Affiliations
N. Khemasiri, King Mongkut's Institute of Technology Ladkrabang (Thailand)
Nanotec-KMITL Ctr. of Excellence on Nanoelectronic Devices (Thailand)
S. Porntheeraphat, National Electronics and Computer Technology Ctr. (Thailand)
Nanotec-KMITL Ctr. of Excellence on Nanoelectronic Devices (Thailand)
M. Horprathum, National Electronics and Computer Technology Ctr. (Thailand)
C. Chananonnawathorn, Tammasat Univ. (Thailand)
W. Bunjongpru, King Mongkut’s Institute of Technology Ladkrabang (Thailand)
National Electronics and Computer Technology Ctr. (Thailand)
D. Phromyothin, King Mongkut’s Institute of Technology Ladkrabang (Thailand)
S. Pratontep, King Mongkut’s Institute of Technology Ladkrabang (Thailand)
J. Nukeaw, King Mongkut's Institute of Technology Ladkrabang (Thailand)
Thailand Ctr. of Excellence in Physics (Thailand)


Published in SPIE Proceedings Vol. 8883:
ICPS 2013: International Conference on Photonics Solutions
Prathan Buranasiri; Sarun Sumriddetchkajorn, Editor(s)

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