Surface Plasmon Resonance Biosensor Based on Guided-wave Plasmon Polariton Modes
Presentation Type
Poster
Abstract
Surface Plasmon Resonance (SPR) is the phenomenon in which charge density oscillations are excited at a metal-dielectric interface. SPR biosensors utilize surface plasmon polaritons (SPP), in which the charge density oscillations are excited by an incident electromagnetic wave. When a protein binding interaction takes place at the surface of the metal, the refractive index is slightly altered, leading to a shift in the excitation wavelength or incident angle of the SPP. The excitation of SPPs is then detected using the Attenuated Total Reflectance (ATR) technique. We have recently developed a novel metal-insulator-metal (MIM) structure capable of supporting Guided-Wave Plasmon Polariton Modes (GW-PPMs). In GW-PPMs, the central insulator is replaced with a higher refractive index than that of the substrate. In contrast to traditional SPPs, GW-PPMs have the potential for increased propagation lengths in certain regions of phase space. The MIM structure that supports GW-PPMs shows promise for biosensor applications because it has been shown that higher propagation lengths lead to increased sensitivity for SPR biosensors. We will discuss both experimental and theoretical progress towards the production of an SPR biosensor based on GW-PPMs.
Start Date
10-5-2018 12:00 PM
End Date
10-5-2018 2:00 PM
Genre/Form
posters
Subjects - Topical (LCSH)
Surface plasmon resonance; Biosensers
Type
Event
Format
application/pdf
Language
English
Surface Plasmon Resonance Biosensor Based on Guided-wave Plasmon Polariton Modes
Surface Plasmon Resonance (SPR) is the phenomenon in which charge density oscillations are excited at a metal-dielectric interface. SPR biosensors utilize surface plasmon polaritons (SPP), in which the charge density oscillations are excited by an incident electromagnetic wave. When a protein binding interaction takes place at the surface of the metal, the refractive index is slightly altered, leading to a shift in the excitation wavelength or incident angle of the SPP. The excitation of SPPs is then detected using the Attenuated Total Reflectance (ATR) technique. We have recently developed a novel metal-insulator-metal (MIM) structure capable of supporting Guided-Wave Plasmon Polariton Modes (GW-PPMs). In GW-PPMs, the central insulator is replaced with a higher refractive index than that of the substrate. In contrast to traditional SPPs, GW-PPMs have the potential for increased propagation lengths in certain regions of phase space. The MIM structure that supports GW-PPMs shows promise for biosensor applications because it has been shown that higher propagation lengths lead to increased sensitivity for SPR biosensors. We will discuss both experimental and theoretical progress towards the production of an SPR biosensor based on GW-PPMs.