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董丽娟刘艳红刘丽想石云龙 《光学学报》2015,(4):260-264
利用隧穿机制研究了含磁光金属Co6Ag94的三明治结构(磁光金属嵌入两个磁光光子晶体中)的透射性质和磁光法拉第旋转效应。在含磁光金属的三明治结构中,分别研究了双透射峰和单透射峰两种情况。研究结果表明,无论是双透射峰还是单透射峰情况,局域在磁光金属和磁光光子晶体界面上的电磁场,都能够同时增强磁光金属的透射和磁光法拉第旋转效应。另外,分析了磁光金属Co6Ag94存在增益时该三明治结构法拉第旋转角达到-45°的情况,此性质为设计小型化的磁光隔离器件提供了理论依据。 相似文献
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利用隧穿机制研究了含磁光金属Co6Ag94的三明治结构(磁光金属嵌入两个磁光光子晶体中)的透射性质和磁光法拉第旋转效应。在含磁光金属的三明治结构中,分别研究了双透射峰和单透射峰两种情况。研究结果表明,无论是双透射峰还是单透射峰情况,局域在磁光金属和磁光光子晶体界面上的电磁场,都能够同时增强磁光金属的透射和磁光法拉第旋转效应。另外,分析了磁光金属Co6Ag94存在增益时该三明治结构法拉第旋转角达到-45°的情况,此性质为设计小型化的磁光隔离器件提供了理论依据。 相似文献
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根据法拉第磁光效应的非互易性,分析了旋光反射腔的光强输出特性,表明这种反射腔具有旋光增强效应.在此基础上提出了用于检测微小旋转角的旋光增强法,并对旋光增强器的特性进行了理论分析和仿真计算.给出了测量灵敏度随器件反射率、样品吸收因素及一次旋光角变化的关系,讨论了角度测量工作点、测量范围以及相对灵敏度理论极限问题.旋光增强器有望应用于微流控系统的旋光检测以及实现磁旋光仪器的小型化和微型化.
关键词:
法拉第磁光效应
磁旋光增强
微小旋光角检测
微流控系统 相似文献
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提出了外腔延时反馈半导体激光器法拉第效应控制下的新激光系统, 构造出两种类型结构光路, 建立了法拉第效应控制下的延时负反馈、延时正反馈激光动力学物理模型, 研究了激光混沌控制与反控制等. 利用法拉第效应原理及磁致旋光性和系统特点, 调节控制光路中的光旋转角度和光延时间可实现双参数控制激光器, 控制激光到双周期、三周期及多周期, 使激光产生拍动等现象, 反控制激光周期到混沌等. 发现了以磁致旋光角分布的激光混沌控制与反控制区域. 并研究了激光混沌控制与周期控制的动态情况, 演示讨论了激光态的转化演变过程等. 相似文献
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戴敏卜胜利孙国庆顾铮■ 《光学技术》2010,(4):535-539
用溶胶-凝胶法制备了Fe-Al2O3铁磁金属-非磁绝缘体基体薄膜。实验结果表明,当Fe与Al2O3的质量比为1∶1,热处理温度为420℃时,所制备的薄膜具有最大的磁致旋光(Faraday)效应,测得的费尔德(Verdet)常数V=(6.8×104)°/(T.cm)。通过分析,得出了Fe-Al2O3薄膜巨磁Faraday旋光效应主要是由光、磁场与薄膜相互作用产生剧烈塞曼(Zeeman)分裂引起的。对影响薄膜Faraday旋光效应的各种主要因素进行了讨论。 相似文献
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《Physics letters. A》2020,384(34):126877
Based on the diffraction effect of sub-wavelength dielectric grating and the optical property of periodic photonic crystal, a hybrid structure of sub-wavelength grating all-dielectric multilayer thin film containing periodic photonic crystal is proposed. The transmission property of the structure is simulated by finite element method (FEM). The result shows that the discrete state generated by the sub-wavelength waveguide grating will be coupled with the continuous state generated by the photonic crystal cavity and the Fano resonance can be formed. The Fano resonance sensing model based on structural parameters and resonance wavelength are established, the influence of structural parameters on the Fano resonance spectral curve is quantitatively analyzed by numerical simulations, and the dynamic detection of the refractive index of samples is realized. The above structure can realize the optical refractive index sensing with high figure of merit (FOM) value and provide an effective theoretical reference for the formation of Fano resonance in the all-dielectric hybrid structure. 相似文献
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The photonic crystal structure has attracted much attention due to its ability to confine light. In this paper, we present our study on an improved Smith-Purcell radiation from a simple metal photonic crystal excited by moving electrons. Different from the wide-band Smith-Purcell radiation from a single metal grating, the results show that the injected electrons could induce more dipole oscillations inside the multi-grating structure, and it leads to the enhancement of the radiation intensity. In addition, there are strong resonances in metal multi-grating structure, and the resonance characteristics may narrow the radiation band, which leads to a radiation with an obvious peak in the spectrum. Therefore, the multi-grating structure has the ability to enhance the radiation intensity and shape the radiation frequency band. By optimizing the structure parameters, coherent and tunable Smith-Purcell radiation can be realized, and it provides a potential way to develop band-controllable light or THz radiation source. 相似文献
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We study the magneto-optic (MO) Faraday rotation in a two-dimensional square-lattice photonic crystal with a central MO defect layer in the optical wavelength range. We show that when a TM plane wave is incident upon a photonic crystal, an enhancement of Faraday rotation takes place in a region where a resonance peak appears in the photonic bandgap. In this region the mode conversion is high. 相似文献
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《Journal of magnetism and magnetic materials》2006,300(1):112-116
Photon trapping in magnetic photonic crystals leads to an enhanced Faraday rotation by increasing the optical path-length of the transmitted beam. The integration of these structures into on-chip photonic circuits, while advantageous from the point of view of component connectivity in multifunctional systems, faces several challenges. Photonic waveguide structures in magnetic films may support more than one mode depending on the waveguide thickness and refractive index. Differences in effective refractive indices between TE and TM modes engender phase disparities, thus hindering the Faraday response of the material. The effects of birefringence and multimodality on the performance of waveguide magnetic photonic crystals in magnetic garnets are addressed in paper. In particular, Faraday rotation enhancement in magnetophotonic crystals in the presence of waveguide birefringence and modal multiplicity on the photonic bandgap spectral response are discussed. Multiple stopbands and significant polarization rotation are observed in multimode Bi-substituted iron garnet film waveguides with single-defect photonic crystal structures. The photonic crystals for this study are patterned on ridge waveguide films by focused-ion-beam (FIB) milling. 相似文献
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近年来,GaN基光子晶体发光二极管(light emitting diode,LED)的研究已经取得了一定的进展,利用光子晶体的光子带隙效应和光栅衍射原理,在LED上制作光子晶体结构将会提高出光效率.本文为了提高AlGaInP系LED的光提取效率,分析了常规LED光提取效率受到限制的原因,将光子晶体结构引入了AlGaInP系LED的器件结构设计,通过理论分析与实验验证,结果显示:光子晶体结构对于提高AlGaInP系LED的光提取效率同样起到了明显的效果,引入光子晶体后,LED的输出光强比常规结构LED平均
关键词:
AlGaInP系LED
光子晶体
光提取效率
光强 相似文献
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The influence of a magnetic defect on the field distribution and magneto-optical properties of a one-dimensional photonic crystal has been investigated. It has been shown that the maximum localization of the wave field in the defect layer is achieved in an asymmetric photonic crystal structure. A greater Faraday rotation, which significantly exceeds the angle of rotation of the polarization plane in an isolated magnetized layer, and a higher degree of localization of the wave field can be achieved when the magnetic layer is surrounded by layers of photonic crystal mirrors with a lower refractive index. An increase in the Faraday rotation angle is determined not only by an increase in the thickness of the magnetic defect but also by a symmetric increase in the number of periods in the photonic crystal mirrors. 相似文献
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A method of designing photonic crystal grating slow-wave circuit for Ribbon--Beam microwave travelling wave amplifiers
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A method of designing a photonic crystal grating slow-wave circuit in which
the cylinders of the 2D photonic crystals dot on a cross-sectional plane is
established by calculating the band structures of the 2D photonic crystals,
and the eigenfrequency of the equivalent waveguide grating. For calculating
the band structures, the eigenvalue equations of the photonic crystals in
the system of photonic crystal grating slow-wave circuit are derived in a
special polarization mode. Two examples are taken to show the method. The
design result is validated by the scattering parameters of the same circuit.
The result indicates that there exists no photonic band gap if the metal
gratings do not extend into the photonic crystals; the design of the circuit
without the metal gratings extending into the photonic crystals is less
flexible than that with the metal gratings extending into the photonic
crystals. 相似文献
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研究了基于结构性改变的光子晶体光纤光栅的热激法制备工艺,理论分析了此种工艺的成栅原理,采用热传导理论和有限元法研究了制备过程中光子晶体光纤中的温度场分布,以及包层空气孔结构和激光参数对成栅效果的影响.研究结果表明,利用光子晶体光纤包层空气孔周期性塌缩可以形成光栅;采用两点热激法时,能够实现能量在光纤径向均匀分布,轴向近似于高斯分布;包层气孔结构加速了成栅过程,相同光斑尺寸下,光纤塌缩所需激光功率随气孔层数和气孔半径的增大而减小;最后,对包层空气孔结构为1层到7层的光子晶体光纤热激过程进行仿真,得到了空气填
关键词:
光纤光栅
光子晶体光纤
热激法
有限元法 相似文献