Field-matter integral overlap to estimate the sensitivity of surface plasmon resonance biosensors

Abstract

We have analyzed the effectiveness of field-matter integral overlap between target index distribution and local near-fields to assess detection sensitivity of surface plasmon resonance (SPR) biosensors. The correlation of the overlap with sensitivity was clear. An overlap integral defined with lateral electric field intensity produced the highest correlation due to tangential continuity across a boundary. Among the three detection scenarios considered, the correlation for localized SPR sensing was slightly lower than that of thin film-based detection and improved with an increased fill factor in the structure. The results will be useful to maximize the optical signature created by target interactions and to produce highest sensitivity of SPR detection to variations when target or field distribution is not uniform.

On the electric field enhancement and performance of SPR gas sensor based on graphene for visible and near infrared

“…overlap volume [31]. The reflectivity from proposed multilayer system is proportional to this overlap volume and accordingly the sensitivity of SPR sensor is proportional to overlap integral [31]. The sensitivity of the sensor increases whenever there is increase in numerical value of overlap integral.…”

Improvement of plasmonic field-matter interaction by subwavelength dielectric gratings

“…Figure 4 displays the vertical intensity profiles at the point where maximum field of E X is found. We note that among three nonzero field components of E X , H Y , and E Z for TM-polarization, the highest correlation between the matter-field overlap and the sensor sensitivity was obtained with the intensity of E X [20]. Hence, we provide only E X field for direct comparison with the sensitivity.…”

Near-field analysis of CdSe quantum dot conjugated core-shell nanoparticle

“…Note that the absorbed power is similar to overlap integrals between electromagnetic fields and target molecules used to represent detection sensitivity [21]. Absorption cross-section is then calculated as dividing P abs by incident field intensity.…”