Antimonene-gold based twin-core SPR sensor with a side-polished semi-arc groove dual sensing channel: an investigation with 2D material

Abstract

We propose surface plasmon resonance (SPR) based single-side polished photonic crystal fiber (SSP-PCF) sensor for low as well as high refractive index (RI) sensing. To achieve this, an active metal gold (Au) is deposited on the PCF's flat narrow channels to form a dual-sensing channel. Following that, a thin nanolayer antimonene is deposited on Au, as its buckled honeycomb lattice structure aids in the trapping of numerous biomolecules. For the sensing range of 1.27 to 1.39, numerical results show that the wavelength sensitivity (WS) and amplitude sensitivity (AS) mounted on 77000 nmRIU -1 and 1320.41 RIU -1 , respectively, with wavelength resolution (RW), and amplitude resolution (RA), as high as 1.298×10 -6 RIU, and 8.6×10 -7 RIU. The promising results obtained from the proposed SSP-PCF sensor offers improved refractive index sensing with a fine figure of merit (FOM), i.e., 311.74 RIU -1 for the sensing range of 1.27 to 1.39, which covers most known analytes such as proteins, cancer cells, glucose, viruses, DNA/RNA, medicinal drugs, halogenated organic acids. Further, the proposed sensor's design requires a simple fabrication procedure.

Refractometric Sensing of Protein in Urine by the Photonic Crystal Fiber Biosensor in THz Regime

“…Recently, surface plasmon resonance-(SPR-) based PCF sensors have been reported, showing noticeable changes in outputs for small changes of refractive index among diferent analytes [9][10][11][12][13][14]. Resonance wavelength and peak confnement loss are very sensitive to RI of the analytes in the SPR-PCF platform [9][10][11][12][13][14].…”

“…Recently, surface plasmon resonance-(SPR-) based PCF sensors have been reported, showing noticeable changes in outputs for small changes of refractive index among diferent analytes [9][10][11][12][13][14]. Resonance wavelength and peak confnement loss are very sensitive to RI of the analytes in the SPR-PCF platform [9][10][11][12][13][14]. As a result, a slight change in RI of the analytes forces to the resonance wavelength to shift right or left and the peak of the confnement loss to higher or lower level [9][10][11][12][13][14].…”

“…Resonance wavelength and peak confnement loss are very sensitive to RI of the analytes in the SPR-PCF platform [9][10][11][12][13][14]. As a result, a slight change in RI of the analytes forces to the resonance wavelength to shift right or left and the peak of the confnement loss to higher or lower level [9][10][11][12][13][14]. Tus, it could be easier to identify the unknown analyte with very tiny changes in RI using SPRbased PCF sensor.…”

“…In addition, the PCF sensor has achieved the highest level of acceptance due to the higher sensitivity, small size, low cost, robustness, and more fexibility [5][6][7][8]. Furthermore, SPR-based PCF biosensor has a good potential for detecting biological components with high accuracy [9][10][11][12][13][14]. For these attractive features and precise level of performance, the PCF sensor has already shown evidence of its potentiality by furnishing the versatile strategies for applications in the sensing feld such as chemical sensing [15], gas sensing [16], biosensing [17], RNA and DNA analysis [18,19], genetic diagnostics [20], cancer diagnosis [21], humidity and temperature sensing [22,23], as well as for low-loss waveguiding [24,25] in the terahertz range.…”