Abstract
We use a gold-nanoparticle coated film to achieve highly spatially resolved biosensing that is based on localized surface-plasmon resonance. Unlike the planar gold film employed for conventional surface-plasmon resonance sensing, the gold-nanoparticle film relies exclusively on shifting of the peak extinction wavelength for detection of biointeraetion and does not depend critically on the angle of incidence. These characteristics permit integration of surface-plasmon resonance with large-numerical-aperture optics to achieve biosensing with high sensitivity and spatial resolution as high as 25 μm.
| Original language | English |
|---|---|
| Pages (from-to) | 2868-2873 |
| Number of pages | 6 |
| Journal | Applied Optics |
| Volume | 43 |
| Issue number | 14 |
| DOIs | |
| State | Published - 10 May 2004 |