Plasmon-induced transparency effect in hybrid terahertz metamaterials with active control and multi-dark modes

We numerically demonstrate a photo-excited plasmon-induced transparency(PIT)effect in hybrid terahertz(THz)metamaterials.The proposed metamaterials are regular arrays of hybrid unit cells composed of a metallic cut wire and four metallic split-ring resonators(SRRs)whose gaps are filled with photosensitive semiconductor gallium arsenide(GaAs)patches.We simulate the PIT effect controlled by external infrared light intensity to change the conductivity of GaAs.In the absence of photo excitation,the conductivity of Ga As is 0,thus the SRR gaps are disconnected,and the PIT effect is not observed since the dark resonator(supported by the hybrid SRRs)cannot be stimulated.When the conductivity of GaAs is increased via photo excitation,the conductivity of Ga As can increase rapidly from 0 S/m to 1×10^(6)S/m and GaAs can connect the metal aluminum SRR gaps,and the dark resonator is excited through coupling with the bright resonator(supported by the cut wire),which leads to the PIT effect.Therefore,the PIT effect can be dynamically tuned between the on and off states by controlling the intensity of the external infrared light.We also discuss couplings between one bright mode(CW)and several dark modes(SRRs)with different sizes.The interference analytically described by the coupled Lorentz oscillator model elucidates the coupling mechanism between one bright mode and two dark modes.The phenomenon can be considered the result of linear superposition of the coupling between the bright mode and each dark mode.The proposed metamaterials are promising for application in the fields of THz communications,optical storage,optical display,and imaging.

某市家庭医生服务签约居民的就诊体验研究

目的评价和分析签约居民在基层医疗机构的就医体验, 为进一步改善家庭医生签约服务质量提供依据。方法利用汉化版的基本医疗质量评估量表(primary care assessment tools, PCAT), 于2020年5—6月对某市9所社区卫生服务中心和9所乡镇卫生院的1 400名家庭医生服务签约居民进行入户调查, 分析其在基层医疗机构的就诊体验。同时对机构管理人员及家庭医生团队进行访谈。运用描述性统计与单因素方差分析进行数据分析。结果共回收有效问卷1 333份, 有效回收率为95.2%。PCAT量表总得分25.17分, 其中首诊、连续性、协调性、综合性、以患者和家庭为中心、社区为导向及文化胜任力7个维度的得分依次为3.57分、3.68分、3.54分、3.40分、3.72分、3.67分和3.59分;372人(47.1%)在去上级医院或专科医院之前未经过签约机构转诊;不同机构类型、年龄、学历、职业和收入的居民在首诊、连续性、协调性与综合性4个核心维度的评分差异有统计学意义(P<0.001)。结论该市家庭医生签约服务工作取得了一定成效, 但仍有提升空间, 建议进一步完善服务的综合性、协调性和可及性, 推动家庭医生签约服务的高质量发展。

某市基层医疗机构医防融合现状分析

目的了解某市基层医疗机构医防融合现状, 分析医防融合过程中的问题, 提出优化建议。方法 2020年6—7月, 以某市169所基层医疗卫生机构作为调查对象, 对机构的基本信息和医防融合评价指标进行问卷调查, 其中医防融合评价指标分为事实性调查和感受性调查两部分。此外, 就基层医疗机构医防融合的现状对32位相关人员进行个人访谈。对数据资料进行信度和效度检验, 描述性分析和分类提取分析。结果经信效度检验, 调查数据的可靠性良好;事实性调查提取3个公因子, 分别为组织管理、信息管理与绩效考核分配;感受性调查提取2个公因子, 分别为工作方式和人员培训。某市在组织管理和工作方式方面医防融合程度较低, 其中, 已制定医防融合规范的机构占比为53.8%, 居民健康信息共享很及时的机构占比仅为41.4%。结论某市基层医疗机构的医防融合程度仍需进一步提高, 未来应重点加强顶层设计, 建立医防融合工作规范和协作机制, 提升医务人员的医防融合意识, 提高信息化水平, 搭建疾病预防、医疗救治和健康管理三位一体的新服务模式。