共查询到19条相似文献,搜索用时 156 毫秒
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为提高传感器的稳定性和便携性,提出一种基于空心微瓶谐振腔的折射率传感器,对系统进行封装并对其折射率传感特性进行研究。仿真分析不同壁厚下空心微瓶谐振腔径向回音壁模式的光场分布,光场在微瓶内部的占比随着器件壁厚的减少而增加,有利于提高传感灵敏度。为减小空心微瓶谐振腔的壁厚,利用氢氟酸对石英毛细管进行腐蚀,使用光纤熔接机制备了薄壁空心微瓶谐振腔。采用紫外胶将耦合系统封装固定在载玻片上,器件稳定性和便携性得到提升。研究了封装器件在不同折射率匹配液下的传感特性,器件传感灵敏度为26.50 nm/RIU。该传感器具有稳定性强、灵活性高、损耗小等优点,在光微流控折射率检测方面拥有很大的应用潜力。 相似文献
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微瓶腔在腔动力学、非线性光学、高灵敏度传感和微型激光器等领域具有非常大的应用潜力.首先,从亥姆霍兹方程出发,详细研究了微瓶腔中的模式场分布理论.利用电弧放电加工方法,制备了扁长型微瓶腔.其次,采用光纤锥波导耦合方式有效激发了微瓶腔中的径向模式和轴向模式,并且通过调节微瓶腔与波导的耦合间隙,实现了对微瓶腔的欠耦合、临界耦合和过耦合三种耦合状态控制.实验中,光谱中回音壁模式得到很好的模式定位和识别,最大品质因子Q值达到1.78×108.通过采用接触式耦合来增强调谐的稳定性,控制不同的耦合位置实现了谐振模式选择性激发,得到了稳定并且干净的谐振光谱.最后,通过选择光纤锥波导直径观察到了Fano谐振效应.所展示的结果对增强微腔传感、非线性光学和腔动力学等应用有重要意义. 相似文献
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提出一种在纤式回音壁模式微球谐振腔,并对其温度和折射率传感特性进行研究。首先,分析了不同尺寸的微球腔与光纤结构耦合时的相位匹配情况,以锥形光纤为探针来拾取并移动钛酸钡微球,将其嵌入空心光纤,形成在纤式谐振腔结构,从而在微球中激发回音壁模式,并与空心光纤端面的反射光相互作用,产生法诺共振。实验结果表明,激发的法诺共振峰曲线的斜率高达-99.3 dB/nm。另外,通过实验证明了此结构对温度和折射率均具有较好的传感特性,灵敏度分别为26.8 pm/℃和-244.97 dB/RIU。该谐振腔性能稳定、结构紧凑、加工简单,在纤式的反射结构使其有望在复杂的传感环境中发挥作用。 相似文献
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《物理学报》2017,(5)
利用流体模型在氩气环境下模拟得到了微空心阴极维持辉光放电的电势、电子密度、离子密度和电场等放电参数的时空分布特性.模拟结果表明,微空心阴极维持辉光放电在不同的时刻表现出不同的放电模式.放电的初始阶段为汤生放电模式;第二阶段为汤生放电模式向空心阴极效应放电模式过渡阶段,微空心阴极维持辉光放电得到初步发展;第三阶段为空心阴极效应放电模式,微空心阴极维持辉光放电区逐渐形成;第四阶段为放电的稳态阶段.在稳态放电状态下,空心阴极腔内的电子和离子密度峰值达到10~(15)cm~(-3),位于空心阴极腔的中心位置,维持辉光放电区电子密度可以达到10~(13)cm~(-3).研究结果同时表明,微空心阴极放电促进了微空心阴极维持辉光放电的形成;同时微空心阴极维持辉光放电也促进了微空心阴极放电的发展.另外,实验研究表明,第二阳极对微空心阴极腔内外的电势、电场和带电粒子密度的分布均有重要影响,并且对维持辉光放电区域的影响更加明显.第二阳极是形成维持辉光放电的必要条件. 相似文献
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开发了氮空心阴极放电PIC/MC二维自洽模型。研究了N2传统空心阴极向微空心阴极放电转变过程中电势和电场的变化。结果表明,不同尺寸的空心阴极放电的电势及电场分布规律几乎类似,但空心阴极孔径减小且气压增加时,电场近似线性增加;典型微空心阴极电场比传统空心阴极放电电场约大3个量级;微空心阴极放电产生的电子,氮分子离子和氮原子离子的密度比传统空心阴极放电约大3个量级,且微空心阴极放电中,N2+密度比N+密度大8倍以上。 相似文献
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一维光子晶体谐振腔的模式类型及其性质 总被引:7,自引:0,他引:7
利用光学传输矩阵法研究了一维光子晶体谐振腔的谐振波长、品质因子和缺陷层厚度之间的变化关系,发现谐振腔内存在不同级次的谐振模式;对于同一级次的谐振模式,品质因子在某一波长(λm)时达到极大值,该波长恰为光子晶体反射率最高处所对应的波长,也是该光子晶体的布拉格共振反射波长;在λm处,品质因子随级次的增加而线性增加;品质因子随周期层数增加而指数增加,但其增长因子与模式级次无关,也与周期数无关,只与谐振波长有关;对于所有级次的谐振模式,增长因子在λm处达到最大值。这对提高品质因子、减小谐振腔体积、优化谐振腔有重要意义。 相似文献
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《核聚变与等离子体物理》2010,(2)
开发了氮空心阴极放电PIC/MC二维自洽模型。研究了N2传统空心阴极向微空心阴极放电转变过程中电势和电场的变化。结果表明,不同尺寸的空心阴极放电的电势及电场分布规律几乎类似,但空心阴极孔径减小且气压增加时,电场近似线性增加;典型微空心阴极电场比传统空心阴极放电电场约大3个量级;微空心阴极放电产生的电子,氮分子离子和氮原子离子的密度比传统空心阴极放电约大3个量级,且微空心阴极放电中,N2+密度比N+密度大8倍以上。 相似文献
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A. Ya. Kirichenko A. E. Kogut V. V. Kutuzov V. A. Solodovnik 《Radiophysics and Quantum Electronics》2003,46(4):281-287
We study experimentally the whispering-gallery modes excited in a dielectric ellipsoidal resonator by a lumped-parameter radiation source and through distributed coupling of a dielectric resonant structure with a dielectric waveguide. Peculiarities of the formation of mode fields and spectra for different mutual locations of the resonator and the exciting element are pointed out. The influence of the derivative of the ellipsoid-surface curvature on the behavior of the energy characteristics of forced modes is found. 相似文献
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We report an experimental observation of strong variations of quality factor and mode splitting among whispering-gallery modes with the same radial order and different azimuthal orders in a scattering-limited microdisk resonator. A theoretical analysis based on the statistical properties of the surface roughness reveals that mode splittings for different azimuthal orders are uncorrelated, and variations of mode splitting and quality factor among the same radial mode family are possible. Simulation results agree well with the experimental observations. 相似文献
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Electrodynamic analysis of a disk dielectric resonator with finite-conductivity end faces that is excited at the whispering-gallery mode is carried out. The inverse problem of determining the components of the permittivity tensor of the anisotropic uniaxial crystal, loss tangent of the dielectric material, and surface resistance of the conductor is formulated and solved. The frequency spectra and energy characteristics of a Teflon disk resonator with copper-covered end faces are studied in the 8-mm wave range. 相似文献
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We investigate the degradation of the Q factor of a fundamental whispering-gallery mode of a microsphere resonator when a fiber tip is placed in the evanescent field of the mode. With a tip diameter of 80 nm it is possible to maintain a Q factor exceeding 10(8), even when the tip is as close as 10 nm to the sphere surface. This result demonstrates the possibility of using such a tip as a "nanotool" to actively place a single nanoparticle in a single high- Q mode with great precision to achieve well-controlled coupling. 相似文献
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Single Photon Scattering in a Pair of Waveguides Coupled by a Whispering-Gallery Resonator Interacting with a Semiconductor Quantum Dot
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《中国物理快报》2016,(2)
The single photon scattering properties in a pair of waveguides coupled by a whispering-gallery resonator interacting with a semiconductor quantum dot are investigated theoretically.The two waveguides support four possible ports for an incident single photon.The quantum dot is considered a V-type system.The incident direction-dependent single photon scattering properties are studied and equal-output probability from the four ports for a single photon incident is discussed.The influences of backscattering between the two modes of the whispering-gallery resonator for incident direction-dependent single photon scattering properties are also presented. 相似文献
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Nataliya K. Sakhnenko Alexander G. Nerukh Trevor M. Benson Phillip Sewell 《Optical and Quantum Electronics》2008,40(11-12):813-820
This article presents an analytical approach to the 2D problem in which a circular whispering-gallery mode (WGM) resonator is subject to an abrupt temporal change in refractive index in a circular coaxial region or in a ring region near the rim. 相似文献
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Junya Yang Chengsong Zhao Zhen Yang Rui Peng Shilei Chao Ling Zhou 《Frontiers of Physics》2022,17(5):52507
We theoretically present a scheme for nonreciprocal ground-state cooling in a double-cavity spinning optomechanical system which is consisted of an optomechanical resonator and a spinning optical harmonic resonator with directional driving. The optical Sagnac effect generated by the whispering-gallery cavity (WGC) rotation creates frequency difference between the WGC mode, we found that the mechanical resonator (MR) can be cooled to the ground state when the propagation direction of driving light is opposite to the spin direction of the WGC, but not from the other side, vice versa, so that the nonreciprocal cooling is achieved. By appropriately selecting the system parameters, the heating process can be completely suppressed due to the quantum interference effect. The proposed approach provides a platform for quantum manipulation of macroscopic mechanical devices beyond the resolved sideband limit. 相似文献
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The whispering-gallery mode (WGM) disk type dielectric resonator used in millimeter wave microstrip integrated circuits has been computed rigorously by the radial mode matching method. The dependence of resonant frequencies of WGM's on the size of shielding box and Q factors of WGM's relating to leakage loss in the case of parallel-plate shielding structure have been analyzed. 相似文献