All-Dielectric Surface-Enhanced Infrared Absorption-Based Gas Sensor Using Guided Resonance

Abstract

The surface-enhanced infrared absorption (SEIRA) technique has been focusing on the metallic resonator structures for decades, exploring different approaches to enhance sensitivity. Although the high enhancement is achieved, the dissipative loss and strong heating are the intrinsic drawbacks of metals. Recently, the dielectric platform has emerged as a promising alternative. In this work, we report a guided resonance-based all-dielectric photonic crystal slab as the platform for SEIRA. The guided resonance-induced enhancement in the effective path length and electric field, together with gas enrichment polymer coating, leads to a detection limit of 20 ppm in carbon dioxide (CO2) sensing. This work explores the feasibility to apply low loss all-dielectric structures as a surface enhancement method in the transmission mode.

Leveraging of MEMS Technologies for Optical Metamaterials Applications

“…In addition to metamaterials, nanophotonics is another branch of research direction for mid‐IR chemical sensing and functional applications, which is beyond the scope of this review. Many works related to SEIRA have been done to detect analytes in the gas phase, the solid phase (thin films), and the liquid phase (solutions) …”

“…Leveraging resonant SEIRA in metamaterials, optical interaction length for the same detection resolution can be reduced by 1000 times compared to spiral waveguide and free space nondispersive infrared (NDIR) gas sensor . To further improve the detection limit of metamaterial gas sensors, different enrichment layers, such as graphene, metal‐organic framework (MOF), polyethylenimine (PEI) are used to trap gas molecules into metamaterial hotspots in order to locally enhance near‐field interaction. Combining PEI and metamaterial absorber, Hasan et al presented a hybrid metamaterial absorber for CO 2 sensing and achieved sub‐ppm level resolution .…”

Light-field enhancement on thin and ultra-thin high-index dielectric slabs with rectangular nano-pits

“…As in Eq. (20), this quantity naturally comes from the overlap integral between the zero-order Rayleigh wave e 0,0 = e ik(γ0x+γ0y) = 1 and the even eigen mode, which should appear in the denominator of the coefficients. A numerical application of (27), to be compared to Fig.2(b), gives: λ T M11 = 555nm with R = (P/w) 2 = 1000, and 520nm with R = 100.…”

“…It also implies that we work with sufficiently extended gratings, with no high-index substrate too close to it, which could, otherwise, convert the surrounding evanescent field, into radiation leaks [41]. However, a substrate underneath may be used to get sensors with positive transmission signals [20]. Besides, to get more compact or miniaturized devices, the integration of the grating in a cavity-resonator may be an interesting solution [42].…”

“…Regarding light localization in small accessible volumes (of subwavelength scale), plasmonic structures had attracted a preponderant interest by the past, but lossless all-dielectric platforms, like the ones based on Fano resonances (possibly tunable [10]), have come back to the front-stage [3,20] and are complementary to nonplasmonic nano-antennas [21]. Sharp Fabry-Perot resonances occurring on thin high-index slabs, containing * jerome.le-perchec@cea.fr is only half that of the slab.…”