Enhanced sensitivity of surface plasmon resonance phase-interrogation biosensor by using oblique deposited silver nanorods

Abstract

Sensitivity of surface plasmon resonance phase-interrogation biosensor is demonstrated to be enhanced by oblique deposited silver nanorods. Silver nanorods are thermally deposited on silver nanothin film by oblique angle deposition (OAD). The length of the nanorods can be tuned by controlling the deposition parameters of thermal deposition. By measuring the phase difference between the p and s waves of surface plasmon resonance heterodyne interferometer with different wavelength of incident light, we have demonstrated that maximum sensitivity of glucose detection down to 7.1 × 10-8 refractive index units could be achieved with optimal deposition parameters of silver nanorods.

Review of Experimental Setups for Plasmonic Photocatalytic Reactions

“…Energy transformation in plasmonic material sensing (i.e., chemical and biosensing [136][137][138][139][140][141] and SERS [119][120][121][122]) resembles that in plasmonic photocatalytic reactions. Therefore, methods of obtaining larger or enhanced signal readings in plasmonic sensing resemble to a higher enhanced processing efficiency in plasmonic photocatalytic reactions.…”

“…Plasmonic incidences is strongly affected by the wavevector of incident light [95]. Therefore, prism-based light incidence systems are frequently used in plasmonic material sensing [137][138][139]. Photocatalyst modification is also frequently used in the study of plasmonic photocatalytic reactions and is discussed in Section 5.1.…”

Fabrication and Characterization of a Metallic–Dielectric Nanorod Array by Nanosphere Lithography for Plasmonic Sensing Application

“…Note that the less |E| and |H| distributions in the core region of the nanorod is due to the skin depth of Ag thin film. Taking into account the device's sensing performance, it is demonstrated that the Mie-resonant structures provide limited precision in comparison to dark modes [80,81] and non-radiation charge-current configurations [82,83]. As is well-known, the electric dipoles are produced by the surface charge pairs and form the dipole moments between the gaps and metal surfaces.…”

Light-matter interactions in aligned silver nanorod arrays

“…Physical vapor deposition (PVD) grown silver (Ag) nanorods have attracted significant attention recently in science and technological applications, including plasmonics [1,2], and sensors [3][4][5][6] through surface-enhanced Raman spectroscopy (SERS). Such nanorods have shown SERS enhancement factors of ∼10 9 [7] and this enhancement strongly depends on the length of the nanorods [3], the incident angle [7], the polarization of excitation light [8], and the design of the structure [9].…”