Research On High Sensitivity Optical Sensor Based On Black Phosphorus

Optical sensing technology has emerged as a major new area in optical communication technology.Many experiments are now being conducted to improve the sensitivity and resolution of optical sensors.The basic idea behind optical sensing structure design in recent years has been to harness the metal plasmon effect to provide high performance sensing.This technology necessitates not only extremely precise processing,but also the sensor’s sensitivity is limited by the thcoretical value,which cannot reach a breakthrough,and the resolution is often low.This research created a plasma sensing structure that works in the infrared band and a novel optical sensing structure based on magnetic resonance based on the foregoing challenges and the property that the newly developing two-dimensional material black phosphorus can boost the optical sensing performance.The following are the important points:A type of infrared plasma sensing stucture based on black phosphorus is designed using nano-antenna theory and numerical simulation.Using a slit absorption enhancement model in a plasmon perfect absorber,the interaction between light and black phosphorus in the infrared band is considerably increased.The sensor can achieve varying sensitivity and figure of merit(FOM)in different crystal directions due to the anisotropy of black phosphorus.sensor sensitivity up to 6940 nm/RIU and FOM up to 13.The simulation findings reveal that the sensor’s absorptivity can achieve 100%in various crystal directions.A multi-resonance non-plasma optical sensor structure based on black phosphorus is designed to overcome the limitations of existing plasma optical sensors by using the magnetic resonance concept to increase the absorption or infrared wavelengths.Two very thin resonant peaks in separate orientations of the black phosphorus crystal near the wavelength of 8μM were obtained by improving the sensor’s construction,and the absorption rate was up to 99.6%.The sensor’s resolution was improved by the sensor’s low full width at half maximum,which increased sensitivity to 180 nm/RIU and FOM to 261.The physical mechanism is deduced from the distribution of electromagnetic fields,and the simulation results are confirmed using the simplified coupled-mode theory.A high sensitivity all-medium optical refractive index sensor based on black phosphorus is being designed to increase sensor perfomance,To restrict the transmission of infrared waves,an infrared cold mirror is utilized instead of a typical metal substrate,reducing metal loss,cost and manufacturing complexity.The interaction between infrared waves and black phosphorus,amplified by magnetic resonance and coupled-mode theory,is used to verify the numerical simulation results.Sensitivity up to 4950 nm/RIU and 5000 nm/RIU,and FOM up to 1395 and 682 in different directions of crystal,were achieved by improving the sensing structure.Finally,the influence of geometric factors and incidence angle on sensor performance is invecstigated.The sensor built in this chapter has considerably enhanced performance and has potential in the realm of optical sensing.