Sensitivity Enhancement of 2D Material-Based Surface Plasmon Resonance Sensor with an Al–Ni Bimetallic Structure

Abstract

In this paper, a variety of 2D materials on the surface plasmon resonance sensor based on Al–Ni bimetallic layer are compared. Simulation results indicate that lateral position shift, which is calculated according to the real and imaginary parts of the refractive index of material, can be used as an effective parameter to optimize the sensitivity. By using the parameters for optimizing the SPR structures, the results show that the multiple layer models of Al(40 nm)–Ni(22 nm)–black phosphorus (BP)(1 L) and Al(40 nm)–Ni(22 nm)–blue phosphorus (BlueP)/WS2(1 L) exhibit average angular sensitivities of 507.0 °/RIU and 466 °/RIU in the refractive index range of 1.330–1.335, and maximum sensitivity of 542 °/RIU and 489 °/RIU at the refractive index of 1.333, respectively. We expect more applications can be explored based on the highly sensitive SPR sensor in different fields of optical sensing.

Lossy Mode Resonance Sensors Based on Anisotropic Few-Layer Black Phosphorus

“…The monolayer BP plane features two non-equivalent directions: armchair (ac) and zigzag (zz), as illustrated in Figure 1b,c. Drawing from prior experimental studies and the Cauchy absorption model [40][41][42][43][44][45], FLBP exhibits refractive indexes of n zz = 3.56 + 0.126i in the zz direction and n ac = 3.29 + 0.428i in the ac direction, which indicates significantly lower imaginary parts of the refractive index compared to bulk BP. Compared to typical metal oxides, e.g., TiO 2 (n TiO 2 = 1.977 + 0.05i) and ZnO (n ZnO = 1.71749 + 0.066i), though, the imaginary part of the refractive index of BP is not relatively small: the real part is larger.…”

Sensitivity-Tunable Terahertz Liquid/Gas Biosensor Based on Surface Plasmon Resonance with Dirac Semimetal

“…Therefore, SPR sensing technology has been widely used in biochemical analysis [ 22 ], food safety [ 23 ], medical diagnosis [ 24 ] and other fields with remarkable effects, such as the detection of staphylococcal enterotoxin in milk [ 25 ], drug residue detection [ 26 , 27 ], real-time disease diagnosis [ 28 ], gas detection [ 29 ], etc. However, the traditional SPR structure usually uses Otto structure or Kretschmann–Raether (KR) structure based on noble metals (such as Au [ 30 ], Ag [ 31 ], Al [ 32 ], etc.) to excite SPR.…”

Improving the performance of high‐sensitivity surface plasmon resonance biosensor with 2D nanomaterial coating (BP‐WS2) based on hybrid structure: Theoretical analysis

“…Recently, two-dimensional nanomaterials have received much attention due to their unique properties. The presence of these materials improves the incident light energy transferring to SPP and leads to an increase in the sensitivity of the sensor [19,20]. Also, the stable chemical properties of these materials protect the internal chemical unstable structure of the SPR sensor [19].…”

“…The presence of these materials improves the incident light energy transferring to SPP and leads to an increase in the sensitivity of the sensor [19,20]. Also, the stable chemical properties of these materials protect the internal chemical unstable structure of the SPR sensor [19]. In the present work, we investigate the performance of the sensor using black phosphorus (BP) and Tungsten Disulfide (WS 2 ).…”

“…These also protect the metal layer from oxidation because oxygen atoms cannot pass through these materials. So far, many works using these two-dimensional nanomaterials have been reported [19,28,29,33]. In this paper, we try to design a biosensor with a simple design and suitable performance characteristics by using two-dimensional materials, which can be easily and cheaply manufactured.…”