| Info. | Vol.1 - No.4 (2007.12.20) |
|---|---|
| Title | Plasmonic Biosensor |
| Authors | Hyeon-Bong Pyo1, Moon Youn Jung1 & Seon-Hee Park1 |
| Institutions | 1IT Convergence and Components Laboratory, Electronics and Telecommunications Research Institute, Daejeon 305-700, Korea Correspondence and requests for materials should be addressed to H.-B. Pyo (pyo@etri.re.kr) |
| Abstract | Issues on optical and physical characteristics of plasmonic biosensor were described. Starting from physical principles of surface plasmons, resonant coupling, and dispersion, we then discussed more practical and essentially important aspects on dielectric functions, penetration depth, and functional differences in SPR imaging systems. Scaling procedure from experimentally obtained SPR curve to incident angle was also discussed. Also, physical background of plasmon-resonant, extinction-, scattering- and near-field cross-section of metallic nanoparticles was briefly explained, based on Mie scattering. Extinction spectra were calculated for various sizes of gold and silver anoparticles and compared with experimentally observed extinction spectra for colloidal gold. |
| Keyword | Plasmonic biosensor, Surface plasmon resonance (SPR), Dispersion relation, Evanescent field, Total internal reflection (TIR), SPR imaging, Localized surface plasmon resonance (LSPR), Extinction spectra |
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