共查询到18条相似文献,搜索用时 265 毫秒
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非扫描衰减全反射探测法监控光漂白过程 总被引:1,自引:0,他引:1
提出了一种基于衰减全反射原理的实时探测方法。其实验框架由半导体激光器、空间滤波器、聚焦透镜、耦合棱镜、CCD接受装置等组成。激光束先经空间滤波器扩束,再由透镜聚焦,以一定角宽度的光束聚焦于耦合棱镜底面,由于棱镜底面的波导结构,在反射光斑中会出现若干条吸收峰,即显示出标志波导模式的一组黑线,若外界条件变化时(如紫外光照射、电极化等),波导薄膜某些参量会受外界条件的变化而变化,表现为黑线的移动,可根据黑线的移动量,精确测量每一时刻波导薄膜的折射率和膜厚等参量。利用这种技术,可以广泛地用于条波导制作、镀膜监控、薄膜极化监控、工业气体浓度监控等领域。 相似文献
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依据全反射理论和棱镜耦合原理,实现了对棱镜折射率及波导薄膜材料折射率和厚度的同步测量。使用高准直半导体激光器激光入射到棱镜内部与波导膜的分界面上,逐步旋转棱镜或改变棱镜的入射角,得到棱镜耦合M线,曲线前面几组的波谷为波导模激发,在M线左侧收尾处有一个不完整波峰,其反射光强随入射角迅速衰减,为全反射时的临界点,由此可实现棱镜及波导薄膜参数的同步测量;用此法测量了棱镜耦合一体化平面波导棱镜的折射率和聚甲基丙烯酸甲酯(PMMA)聚合物波导薄膜的折射率和厚度。测量棱镜折射率精度为±1.9×10-4,波导薄膜折射率和厚度的精度分别为±6.2×10-4 μm和±1.6×10-2 μm。 相似文献
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基于对称金属包覆波导,研究了温度对金属层介电常量及导波层折射率的影响.通过改变金属介电常量和导波层折射率,共振角和衰减全反射吸收峰受到影响.理论和仿真表明:在入射光波长为760nm,覆盖层银膜厚度为35nm,衬底银膜厚度为300nm,导波层为纯水的条件下,温度由10℃升高到70℃时,衰减全反射吸收峰反射率随温度的升高而降低,吸收率提高;共振角随温度的升高,先增加后减小.当金属介电常量对整体的影响大于纯水时,共振角增加,反之,共振角减小.因此,对称金属包覆波导受温度的影响是不可忽略的. 相似文献
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基于单通道反射型电光调制器实现不同路光同时调制的方法 总被引:1,自引:0,他引:1
提出了一种利用单通道反射型聚合物电光调制器同时调制不同路光的方法。衰减全反射结构的电光调制器,其每一个衰减全反射(ATR)峰的位置分别对应于一个导波共振模式。实验系统中利用衰减全反射导膜峰作为调制通道,使其每一路光路的入射角分别对应于不同导波共振模式的工作角,就可以实现利用单通道的电光调制器同时调制不同路光。提出了三种实现两路光同时调制的模式,并给出了三种模式的调制结果。结果表明,作为调制通道的导模阶数越低,调制效率越高。在832 nm光波波长下,采用最低阶导模进行调制时可以获得42.9%的调制效率。 相似文献
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We report experimental excitation and characterization of surface plasmon modes in planar metal-insulator-metal (MIM) waveguides. Our approach is based on determining the width of the reflection angular spectrum in the attenuated total reflection (ATR) configuration. Owing to its transverse character, the ATR configuration provides a more straightforward and simpler way to determine the loss of plasmonic modes in MIM structures, compared to using tapered end couplers with multiple waveguide samples or scanning near-field optical microscopy. In this Letter, two waveguide structures with Au claddings and 50/200 nm SiO(2) cores are investigated. The propagation lengths measured at λ = 1.55 μm are 5.7 and 18 μm, respectively, in agreement with the theoretical predictions. 相似文献
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Yanfang Yang Zhuangqi Cao Qishun Shen Jumin Hao Ling Qiu Yuquan Shen Wen Yuan Pingping Xiao 《Optics & Laser Technology》2005,37(3):225-228
Multi-channel light modulation, which is based on the attenuated total reflection (ATR) configuration, is proposed in this paper. The device consists of a prism and a polymer optical waveguide. Guided modes which give rise to the resonance dips in the ATR spectrum are employed to act as the modulation channels. Double channel's modulation with the same modulation signal has been demonstrated in the proposed device. 相似文献
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Yanfang Yang Jie Yin Zhuangqi Cao Qishun Shen Xuwei Chen Ling Qiu Yuquan Shen 《Optics & Laser Technology》2007,39(5):1008-1013
The fabrication and characteristics of a new type of polymeric electro-optic modulator with double channels in attenuated total reflection (ATR) configuration, made of a thermally crosslinkable polyurethane, has been demonstrated in this paper. The fabrication procedure of proposed double-channel ATR modulator is extremely simple, it can be implemented by replacing a single electrode with two discrete electrodes in a single channel ATR modulator. Independent operation of both channels is demonstrated at a modulation speed of 500 MHz. The total measured insertion loss of the modulator is below 1.5 dB. There are no measurable cross talks due to the large horizontal separation of two channels and the small vertical separation of the electrode pair. A long-term thermal stability of the fabrication modulator at an elevated temperature, 100 °C, is obtained due to crosslinking polyurethane as the waveguide layer of the devices. 相似文献
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研究了交联型聚氨酯材料集成衰减全反射型双通道聚合物波导电光调制器的制备和性能。这种电光调制器的制备技术非常简单,只要用两个分立的下电极代替单通道调制器中的下电极即可。通过测量器件的调制特性,在832 nm波长下,获得了最大电光系数为24.2 Pm/V,调制带宽约为500 MHz、插入损耗低于1.5 dB。由于器件上下电极的垂直距离为微米级、而通道之间的水平距离为毫米量级的设计,使各通道之间的场不会引起相互交迭,因而未测到各通道间的串扰。另外,热交联型聚合物材料的采用提高了整个器件的热稳定性,在100℃经过800 h后,电光系数仍然保持初值的88%。 相似文献
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Electro-optic (EO) effect and thermo-optic (TO) effect are jointly considered on the basis of field-induced and temperature-affected perturbations of the operating point in waveguide components. TO coefficients of EO fluorinated polyimide films with side-chain azobenzene chromophore were measured by attenuatedtotal-reflection (ATR) technique at different temperatures with TE- and TM-polarized lights, respectively.It is found that the absolute values of TO coefficients increase with the increments of both chromophore concentration and film thickness, but the polarization dependence of TO coefficients increases with the increment of chromophore concentration and decreases with the increment of film thickness. 相似文献
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We used an asymmetric layered system functioning as a plasmon waveguide coupler to couple surface plasmon modes with gap plasmon
modes. The planar system was analyzed by the transfer matrix method to design the optical dimensions of the system. We simulated
the effective mode indexes and H-field distribution of the coupled modes, for different gap widths and refractive indexes. For the calculated modes the propagation
lengths were calculated. Furthermore, a sample structure was fabricated and odd gap plasmon modes were excited with a coupling
prism in an attenuated-total-reflection (ATR) configuration. The mode index measurement showed good agreement with the simulation
data. 相似文献