Localized surface plasmon resonance (SPR) biosensors with metallic nanowires regularly patterned on a gold film are considered for sensitivity enhancement. The theoretical investigation was conducted using rigorous coupled wave analysis in terms of various design metrics, such as the resonance angle shift, the SPR curve angular width, and the minimum reflectance at resonance. The results show that nanowires of a T-profile present more effective sensitivity enhancement than an inverse T-profile. The sensitivity enhancement mediated by the presence of nanowires has also been clarified qualitatively based on the dispersion relation between metal film involving nanowires and surrounding dielectric medium. The study is expected to provide extremely high sensitivity in SPR-based biosensing.
Bibliographical noteFunding Information:
This work was supported by the SRC/ERC program of MOST/KOSEF (R11-2000-075-01001-1). D. Kim acknowledges the support by KOSEF through National Core Research Center for Nanomedical Technology (R15-2004-024-00000-0).
Sung June Kim received the BS degree in electronics engineering from Seoul National University in 1978 and the MS and PhD degrees from Cornell University, Ithaca, NY, USA in 1981 and 1983, respectively. He had been with the AT&T Bell Laboratories as a member of the technical staff from 1983 to 1989, where he had worked on VLSI design and technologies, and InP based opto-electronic IC technologies. In 1989, he joined Seoul National University as a professor. In 2000, he started the Nano-Bioelectronics and Systems Research Center as director, which is an ERC sponsored by the Korean Science and Engineering Foundation (KOSEF). His research activity is devoted to the design and fabrication of neural prostheses systems, development of nano and micro technologies for neural applications, and design of ASIC for neural signal processing.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Metals and Alloys
- Electrical and Electronic Engineering
- Materials Chemistry