▎ 摘　　要

NOVELTY - Dielectric prism structure comprises an ethylene-tetrafluoroethylene hemispherical prism (4), where the upper end of the ethylene-tetrafluoroethylene hemispherical prism is fixedly provided with a single-layer graphene film (3), a PDMS ring (1) is fixedly set at the upper end of the single-layer graphene film and the center of the ethylene-tetrafluoroethylene hemispherical prism, the middle part of the PDMS ring is provided with a sample liquid layer (2), the PDMS ring is opened with an air micro-flow channel (5). USE - Used as dielectric prism structure. ADVANTAGE - The dielectric prism structure: adopts graphene and dielectric prisms to avoid the loss of incident light by the metal, and achieves higher precision sensing of grapheme and having the sensitivity of 230,000 nm/RIU i.e. more greater than that of normal optical sensors, and the angle of incidence, which does not has strict limits on the proposed structure. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for sensing the dielectric prism structure by using graphene, comprising (i) using a dielectric prism structure, using a PDMS ring (to fix the sample liquid layer and open air microfluidic channel in PDMS ring, optical total reflection is achieved by adjusting the relationship between the refractive indices of the air, the dielectric prism, and the liquid layer, and placing the single-layer graphene film on the ethylene-tetrafluoroethylene hemisphere prism and the sample liquid between the layers, the single-channel coherence method is used to realize the complete absorption of the incident light by the graphene, realizing high-performance optical sensing, and controlling the change of the refractive index by changing the liquid layer of the sample, and simulation simulation method to optimize the optical sensing of graphene in the dielectric prism structure; and (ii) according to the basic theory of thin film optics, the phase factor delta 2=2 pi n2d2cos tau 2/ lambda of light in the liquid sample layer, the contribution of the phase factor to the graphene is neglected because the thickness of the single-layer graphene film is small, the sensitivity formula of the sensor is derived by the phase factor, as shown in following of: seen that the sensitivity S is determined by the refractive index n1 of the dielectric prism, the refractive index n2 of the sample, and the thickness d2 of the liquid sample layer, the incident angle tau 1 and the phase factor tau 2 are determined together, and the studies have shown that the condition of the excitation resonance in the multilayer film is that the phase of the round-trip satisfies an integral multi of 2 pi (2) i.e. 2d2+fhalf=2(n+1)p(n = 0,1,2K) (3) where half is a phase mutation caused by half-wave loss, and its value is pi , so in order to obtain higher sensitivity, the refractive index n1 of the dielectric prism is fixed at 1.404, and the incident angle tau 1=89 degrees , the sample layer thickness is d2=4200 nm, and n2 is changed from 1.405-1.4054. The resonance wavelength shows a significant red shift from 995-1160 nm, and the sensitivity exceeds 440000 nm/RIU, the sensing quality factor FOM is defined to better The sensing performance of the designed structure is presented, the FOM can be determined as: GFW represents the full width at half maximum of the resonance, the refractive index is increased from 1.405-1.41, the resonant wavelength of the low-order mode is red-shifted to the near-infrared band, and a high-order mode appears, the higher-order mode resonance wavelength shifts from 400-800 nm, which shows better sensing performance, and the higher-order mode has a narrower half-height width than the lower-order mode, and the FOM is better, this can be utilized by high Order resonance to optimize FOM to introduce high-order resonance by increasing d2, thus achieving the purpose of reducing GFW and optimizing FOM by increasing d2 to 12800 nm, the three high-order resonances appear in the spectrum from visible to near-infrared, and all three resonances have a very narrow bandwidth, and increasing n2 by 0.0001, which can be seen that the three bands are obviously red-shifted, and these bands can cover the entire visible to near-infrared region, which indicates high sensitivity and FOM from visible to near-infrared spectra, the sensitivity and FOM of these three bands can be respectively Up to 420000, 250,000, 170000 nm/RIU and 1372, 2173, 2786, the FOM is optimized by using higher-order resonances; systemic analysis of incident angle sensitivity, when the incident angle is adjusted to 86 degrees , the resonant wavelength is 1001nm red shift to 1938nm and which indicates that the resonant wavelength lambda = 2 pi n2d2cos tau 2/ pi 2 can be determined by fixing other parameters and changing the incident angle, when the incident angle tau 1 decreases, tau 2 will also decrease and cause red shift of the resonant wavelength, the first-order sensitivity resonance decreases from 420000-230000 nm/RIU, when tau 1 changes and other parameters are fixed, the sensitivity is follow the change in the incident angle varies, this is because in the expression of sensitivity, f(n1, n2, Dn, q1) is a monotonically increasing function with respect to the incident angle tau 1, so the incident angle is reduced from 89 to 86 degrees and the sensitivity will decreases, even so, the sensitivity of 230,000 nm/RIU is much greater than that of conventional optical sensors, which is that the angle of incidence does not have strict limits on the proposed structure. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of dielectric prism structure. PDMS ring (1) Sample liquid layer (2) Single-layer graphene film (3) Ethylene-tetrafluoroethylene hemispherical prism (4) Air micro-flow channel (5)