Surface plasmon resonance (SPR) refers to excited charge density oscillations that exist along the boundary between a metal and a dielectric with permittivities of opposite signs. When the orientation of the electric field vector of an incident light matches the movement of free electrons in the metal as restricted by the boundary conditions associated with some material and structural parameters, surface plasma waves (SPW) can be excited, and consequently efficient coupling with large energy as guided electromagnetic wave along the interface may occur. This phenomenon of unexpected attenuation was first discovered by Wood  in 1902 when they measured the reflection of metallic gratings and found that some optical power was absorbed by the metal because of the excitation of SPW. The focus on developing SPR sensing was inspired after the introduction of attenuated total internal reflection (ATR) by Otto  and Kretschmann  in 1968. It was not until 1983 that Liedberg and Nylander  reported the first practical sensing application of SPR for biomolecular detection. Since then, SPR biosensors have experienced rapid development in the last two decades and become a valuable platform for qualitative and quantitative measurements of biomolecular interactions with the advantages of high sensitivity, versatile target molecule selection, and real-time detection. For this reason, SPR sensors are now widely adopted for meeting the needs of biology, food quality and safety analysis, and medical diagnostics.
KeywordsSurface Plasmon Resonance Infectious Bursal Disease Virus Surface Plasmon Resonance Sensor Zehnder Interferometer Surface Plasmon Resonance Imaging
This work has been supported by the Hong Kong Research Grants Council under a group research project (Ref. # CUHK1/CRF/12G).
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