title: Increased surface plasmon resonance sensitivity with the use of double Fourier harmonic gratings.
abstract: A biomolecular sensor consisting of a thin metallic grating deposited on a glass prism is studied in the formalism of poles and zeros of the scattering matrix. Surface plasmon resonance is used to increase the sensitivity of the device with respect to a variation of the refractive index of the substrate. It is shown that a direct coupling between counter propagating surface plasmons using double-harmonic Fourier gratings leads to an enhancement of the sensitivity. The result of the stronger coupling is the transfer of the working point from the lower to the upper edge of the band gap in the dispersion diagram.
authors.affiliation: Institut Fresnel, CNRS UMR 6133, Aix-Marseille Université, Domaine Universitaire de Saint Jérôme, 13397 Marseille Cedex 20, France. nicolas.bonod@fresnel.fr
authors.forename: Nicolas
authors.initials: N
authors.lastname: Bonod
authors.forename: Evgeny
authors.initials: E
authors.lastname: Popov
authors.forename: Ross C
authors.initials: RC
authors.lastname: McPhedran
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005583:Fourier Analysis; D005898:Glass / Q000737:chemistry*; D008670:Metals / Q000737:chemistry*; D012031:Refractometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D020349:Surface Plasmon Resonance / Q000295:instrumentation* / Q000379:methods
chemical_list: D008670:Metals