Mr. Chien-Sheng Liu Profile

Chien-Sheng Liu

at National Taiwan Univ

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Proceedings Article | 11 September 2010 Paper

The studies of Schottky-diode based co-plane detector for surface plasmon resonance sensing

Chien-Sheng Liu, Tsun-Yu Wen, Da-Shin Wang, Chii-Wann Lin

Proceedings Volume 7757, 77570X (2010) https://doi.org/10.1117/12.860338

KEYWORDS: Sensors, Surface plasmons, Zinc oxide, Biosensors, Diodes, Gold, Signal detection, Biosensing, Interfaces, Photodetectors

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The Surface Plasmon Resonance (SPR) is a label-free, highly sensitive and real time sensing technique and has been extensively applied to biosensing and assay for decades. In a conventional SPR biosensor, a prism is used to create the total reflection in which the evanescent wave can excite the surface plasmon mode at the metal-dielectric interface at certain angle, at which condition the reflectivity of incident TM-polarized vanished as measured by a far-field photodetector. This is the optical detection of surface plasmon resonance. In this research, zinc oxide (ZnO) was used as the dielectric thin-film material above the gold surface on the glass substrate to form a co-plane Schottky diode; this structure is designed to be an alternative way to detect SPR. The strength of plasmonic field is possible to be monitored by measuring the photocurrent under the reverse bias. According to our experimental results, the measured photocurrents with TM-polarized illumination (representing the SPR case), TE-polarized illumination (non-SPR case) and no illumination conditions under DC -1.5V bias are -76.158mA (2.5μA), -76.085mA (3.6μA) and -76.089mA (3.4μA), respectively. Based on the results, we have demonstrated this Schottky diode based co-plane device has the potential to be used as the SPR detector and provides a possible solution for the need of a low-cost, miniaturized, electronically integrated, and portable SPR biosensor in the near future.

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