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Study On Splitting Performance Of Multiple Micro/Nano Structural Diffraction Gratings

Posted on:2018-01-30Degree:MasterType:Thesis
Country:ChinaCandidate:H T LiFull Text:PDF
GTID:2348330536470543Subject:Electronic Science and Technology
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Microstructured diffraction grating devices are the high-integrated and high-precision microstructures,which can be applied in many modern optical precise devices and systems.With the increasing requirement of the micro/nano structured devices in chirped pulse amplified systems and dense wavelength division multiplexing systems for the modern optoelectronic industry,therefore,it is necessary to develop more micro/nano gratings with the novel structures and performances.Thus,the following eleven micro/nano diffraction gratings with different incident conditions,different structures and different performances can be researched based on rigorous coupled-wave analysis(RCWA)method and modal method in this paper:(1)This paper presents a novel sandwiched metal-dielectric polarizing beam splitter grating under a Littrow mounting.The device can realize the high efficiencies in the-1st order for TE polarization and in the 0th order for TM polarization;moreover,the extinction ratio and the spectral bandwidths of such grating can be improved greatly.(2)This paper shows a novel polarization-independent three-layer single-port grating with high efficiency and broad angular bandwidth under Littrow appliance.The grating parameters are evaluated based on the theoretical modal method,the exact grating parameters are designed by use of RCWA method.(3)This paper shows a novel polarization-independent sandwiched broadband two-port grating with a connection layer under Littrow device.In theory,the modal method can evaluate grating parameters.RCWA can calculate the precise parameters based on numerical simulation.The obtained results based on two methods coincide well with each other.(4)This paper shows a novel polarization-dependent sandwiched fused-silica three-port grating with a connection layer under second Bragg angle incidence.According to the RCWA method,the high splittingefficiencies with good uniformity can be obtained.According to use modal method,the coupling physical mechanism and splitting behavior in the grating region for the diffraction beam can be well and completely explained.(5)This paper presents a novel polarization-dependent three-port reflective grating device under second Bragg angle incidence.The device can achieve the three-port high-efficiency splitting with good uniformity by using RCWA.The obtained optimal results can be well explained by use of modal method.(6)This paper shows a novel polarization-independent sandwiched transmission three-port grating with a connection layer under normal incidence.The high-efficiency broadband three-port grating is optimized and designed by use of RCWA.The obtained numerical results are in agreement with the theoretical results based on modal method.(7)This paper shows a novel polarization-independent sandwiched two-layer reflective broadband three-port grating under normal incidence.The high-efficiency three-port splitting results with good uniformity and broad angular bandwidth is obtained by using RCWA.(8)This paper shows a novel polarization-independent reflective three-port grating with a connecting layer under normal incidence.By use of RCWA,the exact results of high-efficiency three-port splitting efficiencies are gained.(9)This paper presents a novel polarization-dependent reflective three-port grating with a connecting layer under second Bragg angle incidence.RCWA can calculate the grating parameters and high-efficiency values.Modal method can explain diffraction mechanism.(10)This paper shows a novel polarization-independent sandwiched high-efficiency and broadband single-port grating with a connecting layer under Littrow mounting.RCWA and modal method are used together to optimize grating parameters and explain theoretical coupling mechanism clearly,respectively,and the solved diffraction efficiencies are in agreementwith each other.(11)This paper shows a novel polarization-dependent transmission three-port grating with a connection layer under second Bragg angle incidence.The high-efficiency results and exact grating parameters are obtained.Based on modal method,physical coupling process can be well explained completely.
Keywords/Search Tags:high-efficiency diffraction gratings, polarization characteristics, incident broadband, rigorous coupled-wave analysis, modal method
PDF Full Text Request
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