Abstract
A surface plasmon resonance (SPR) sensor based on gate-controlled periodic graphene ribbons array is reported. Different from the conventional methods by monitoring reflectivity variations with respect to incident angle or wavelength, this approach measures the change in SPR curve against the variation of graphene chemical potential (via dynamically tuning the gate voltage) at both fixed incident angle and wavelength without the need of rotating mirror, tunable filter or spectrometer for angular or wavelength interrogation. Theoretical calculations show that the sensitivities are 36,401.1 mV/RIU, 40,676.5 mV/RIU, 40,918.2 mV/RIU, and 41,160 mV/RIU for analyte refractive index (RI) equal to 1.33, 1.34, 1.35 and 1.36; their figure of merit (1/RIU) are 21.84, 24, 23.74 and 23.69, respectively. Significantly, the enhancement in the non-uniform local field due to the subwavelength graphene ribbon resonator can facilitate the detection in redistribution of protein monolayers modeled as dielectric bricks.
Highlights
A surface plasmon resonance (SPR) sensor based on gate-controlled periodic graphene ribbons array is reported
The literature focused on SPR sensors, which were designed for detecting chemical and biological species, based on the unlocalized surface plasmons propagating along wave-guiding structures were intensively r eviewed[14]
The enhancement in quality (Q) factor further improves the figure of merit (FOM) of the b iosensor[18]
Summary
A surface plasmon resonance (SPR) sensor based on gate-controlled periodic graphene ribbons array is reported. Among the known diagnostic techniques, label-free optical biosensors provide high sensitivity and robustness solutions. The sensed medium attached to the position where SPR occurs strongly affects the resonance effect Such a phenomenon has been widely applied in the design of biosensors for detecting the change in RI of an analyte. The literature focused on SPR sensors, which were designed for detecting chemical and biological species, based on the unlocalized surface plasmons propagating along wave-guiding structures were intensively r eviewed[14]. RI sensor using long-range surface plasmon mode, which exhibits symmetric field pattern, was shown to have high sensitivity compared with conventional SPR ones due to low loss[17]. By spin-coating the GeSe nanosheets on the surface of noble metal (Au), a SPR sensor can significantly enhance its s ensitively[26]
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