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Research On Fano Resonance Characteristics Of New Resonant Cavity And Its Detection And Application

Posted on:2021-04-18Degree:MasterType:Thesis
Country:ChinaCandidate:G WangFull Text:PDF
GTID:2428330629452989Subject:Electronic Science and Technology
Abstract/Summary:PDF Full Text Request
Optical microcavity sensor is an important research direction of the current micro-optoelectromechanical system?MOEMS?devices.Because of its own structure and performance advantages,it can be expected that it will have a wide range of applications in the future decades,whether in the field of national defense or in the field of civil.In this paper,the Fano resonance characteristics of the new resonator are studied,and the corresponding sensors are tested and applied,mainly including the following three aspects:Firstly,a loaded hybrid plasmon waveguide resonator based on molybdenum disulfide was proposed.The propagation length is as high as 4.85 cm,and the corresponding mode width is 981 nm.A near-infrared plasmonic sensor based on the hybrid plasmonic waveguide-nanocavity system achieves a refractive index sensitivity of 787.5 nm/RIU,line width and figure of merit of 30 nm and 26.3,respectively,at the same time the temperature sensitivity is as high as 2.775 nm??.Compared with other researches,the sensor proposed in this paper improves the adaptability and sensitivity of the device,and the ultracompact structure combined with the planar waveguide structure makes it easy to integrate to chip.In addition,the device can also be used as an adjustable surface plasmon polaritons band-pass filter.Secondly,a surface plasma optical waveguide structure consisting of a metal-insulator-metal?MIM?waveguide,a rectangular resonator and a crescent-shaped resonator is studied.The effects of the coupling distance,geometry of the crescent-shaped cavity resonator and its rotation angle,and length and width of the rectangular cavity resonator on the Fano resonance lines were numerically analyzed.Multiple Fano resonances can be produced as the rotation angle of the crescent-shaped cavity resonator is adjusted,and the sensor's refractive index sensitivity was found to be 935.71 nm/RIU.By measuring the water content in heavy oil,we found that the Fano resonance lines shift towards shorter wavelengths as the volume fraction of water content increases.We obtained a linear relationship between the Fano resonance wavelength and the volume fraction of water in heavy oil,and the detection resolution in heavy oil 1.79×10-9.Finally,a surface-plasma optical waveguide structure consisting of a metal-insulator-metal?MIM?waveguide,a semicircular resonator,and a T-shaped resonator is studied.The effects of coupling distance,geometrical size of T-shaped cavity and its asymmetry,and radius of semi-circular cavity on Fano resonance spectrum are analyzed numerically.By changing the asymmetry of the T-shaped cavity,multiple Fano resonances are achieved,and the sensitivity of the refractive index sensor is up to 1066.67 nm/RIU.The detection of the water content of heavy oil found that the Fano resonance line shifted to the short-wave direction as the volume percentage of water contained increased.The linear relationship between Fano resonance wavelength and volume percentage of water content in heavy oil was obtained.The volume percentage resolution of the sensor's heavy oil water content can be as low as 2.05×10-9.The results show that the water content in heavy oil can be calculated according to the change of Fano resonance wavelength.The proposed structure can overcome the shortcomings of common refractive index sensor and has great application prospects in chemical and biological sensing.The results obtained by the above research can not only solve the limitations of low-light sensor performance,but also apply the manufactured sensor system to achieve the characteristics of remote monitoring,real-time analysis,reliable environment adaptation,etc.that are not available in the electricity sensor.The research shows that the combination of nanotechnology and SPR sensing can lay a solid foundation for the field of electromagnetic measurement and sensing.
Keywords/Search Tags:Surface plasmon ploariton, SPP waveguide, micro-optoelectromechanical system(MOEMS), Finite element method
PDF Full Text Request
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