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.
Highlights
Optical sensors, the devices which can transform the information of light-matter interactions into the analytic electronic signal, become more and more important nowadays for the fields such as security for environment and food [1,2], energy [3], remote sensing, and medical diagnostics [4] because of their ultrafast responsibility and remote sensing ability
Surface plasmon resonance (SPR) as a kind of electromagnetic resonance of the conduction electrons on metal surface is very sensitive to the environmental refractive index variation, which can be considered as a useful sensing parameter [5]
We observed that highresolution angular measurement and biological sensing can be achieved by SPR phase interrogation at optimized incident wavelength [17,20]
Summary
The devices which can transform the information of light-matter interactions into the analytic electronic signal, become more and more important nowadays for the fields such as security for environment and food [1,2], energy [3], remote sensing, and medical diagnostics [4] because of their ultrafast responsibility and remote sensing ability. Since the first observation of surface plasmon resonance (SPR), various optical methods have been explored to excite SPR at a metal-dielectric interface [9]. Such an excitation can be utilized to achieve sensing of various interfacial phenomena with extreme sensitivity. These include, for example, chemical and biological sensing [10,11,12,13,14,15,16,17,18], film-thickness sensing [19], temperature sensing [20], and angular measurement [21]. We observed that highresolution angular measurement and biological sensing can be achieved by SPR phase interrogation at optimized incident wavelength [17,20]. Modification of the surface roughness of the metallic film will change the sensitivity of SPR sensor [9,21,22]
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