Graphene plasmonics for ultrasensitive imaging-based molecular fingerprint detection

Abstract

Imaging-based molecular fingerprints detection in mid-infrared region has emerged as a promising technique for the chemical identification of various molecules through pixelated dielectric metasurfaces. However, the integration and practical application...

A mid-IR tunable graphene metasurface for ultrasensitive molecular fingerprint retrieval and refractive index sensing

“…10 According to the equivalent medium theory, the effective permittivity of proteins with different amount can be expressed as ε eff = f · ε p + (1 − f )where f is the filling factor, which here represents the A/G protein content. 48…”

“…38–46 Therefore, the surface conductivity of graphene can be easily controlled by applying a bias voltage, promising the selective detection of various molecules in a wide spectral range. 47–49…”

Efficient Excitation and Active Control of Propagating Graphene Plasmons with a Spatially Engineered Graphene Nanoantenna

“…It is worth mentioning that the decrease in the graphene relaxation time does not change the resonance frequency of the GP launcher, and the GP is still excited but with a smaller near-field intensity (see Figure S3). 41 Moreover, it should be noted that the characteristic dimension parameters of the GNA-based propagating GP launcher such as w = 60 nm and d 2 = 80 nm are far from the subnanoscale in which it makes sense to ignore some quantum effects such as nonlocal effects. 42 Since the propagating GPs in MG are excited by the resonant GNA, the propagation behavior of GPs is modulated by the Fermi level of GNA.…”