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Study of an integrated-optical slow light ring-resonator for sensing applications

机译:用于传感应用的集成光学慢光环谐振器的研究

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摘要

Integrated-optical (IO) micro-ring, -disk, and -sphere resonators have been long considered as a good candidate to enhance optical sensor performance. To the best of our knowledge, none of previous reported works has explicitly attributed such (expected) enhancement to slow-light phenomenon, i.e. a phenomenon where the group velocity of light is much lower than the light velocity in vacuum (c); a phenomenon which obviously can be expected also for a properly-designed ring-resonator circuiT. Consequently, none of those works has explicitly made use of this phenomenon for optimizing the sensor performance. Hence, so far, the reported detection limit of ring-resonator based sensor (best reported value around 1E-7 RIU) is in general poorer than IO Mach-Zehnder interferometer (MZI) sensor (best reported value around 1E-8 RIU). In this work, we present a theoretically study on slow-light in ring-resonator circuits and discuss quantitatively its role in enhancing the sensor performance. The model is based on the transfer matrix method and the complex transmission coefficient approach, by assuming a homogeneous refractometric IO sensor with MZI read-out scheme. The modeling results show that using realistic structure parameters and a typical read-out capability, a refractive index detection limit of one order better than the present state of the art IO MZI sensing structure can be expected by the inclusion of such a slow-light structure. The realization of such device is under progress at the moment of the preparation of this abstract. The device will be based on $Si_3N_4$ IO technologies with a serrodyne phase readout scheme employing a ZnO electro-optical modulator. The latest results of the realization and experimental progress will be reported in the conference as well.
机译:长期以来,集成光学(IO)微环,-磁盘和-球形谐振器一直被认为是增强光学传感器性能的良好选择。据我们所知,以前的报道均未明确将这种(预期的)增强归因于慢光现象,即群光速远低于真空中光速的现象(c)。设计合理的环形谐振器电路显然也可以预期这种现象。因此,这些工作都没有明确利用这种现象来优化传感器性能。因此,到目前为止,基于环形谐振器的传感器的报告检测极限(最佳报告值约为1E-7 RIU)通常比IO Mach-Zehnder干涉仪(MZI)传感器(最佳报告值约为1E-8 RIU)差。在这项工作中,我们提出了对环形谐振器电路中的慢光的理论研究,并定量讨论了其在增强传感器性能方面的作用。该模型基于传输矩阵方法和复传输系数方法,并假设具有MZI读出方案的同质折光IO传感器。建模结果表明,通过使用实际的结构参数和典型的读取能力,可以通过包含这样的慢光结构来预期比当前的现有技术IO MZI感应结构好一个数量级的折射率检测极限。在准备本摘要时,这种设备的实现正在进行中。该设备将基于具有ZnO电光调制器的Serrodyne相位读取方案的$ Si_3N_4 $ IO技术。实现的最新结果和实验进展也将在会议上报告。

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