We present the simulation and experimental demonstration of a coupled-cavity 1D photonic-crystal/photonic-wire (PhC/PhW) structure that produces multiple resonance wavelengths. The combination of several cavities results in the assembly of a spectral response that exhibits multiple resonance wavelengths and potentially leads to the wavelength control required for wavelength division multiplexing (WDM) applications. By using a structure with three distinct in-line cavities, we have obtained three distinct resonance wavelengths—in conformity with the rule that the number of distinct resonance wavelengths is proportional to the number of cavities. The experimental photonic wire waveguide structure had cross-sectional dimensions of 600 nm (width)נ260 nm (height)—with an embedded photonic crystal (PhC) micro-cavity—all based on a silicon-on-insulator (SOI) platform. The embedded PhC structure was tailored to give resonance wavelengths in the C-band and L-band fiber telecommunication range. With the introduction of tapering in the multiple micro-cavity structure, it was possible to obtain three resonance wavelengths that correspond to WDM wavelengths of 1534.87, 1554.63 and 1594.86 nm—whereas, without tapering, the resonance wavelengths were 1645.60, 1670.76 and 1698.68 nm, respectively. We have observed an asymmetric free spectral range (FSR) situation with un-equal resonance wavelength spacing. The taper regions are also responsible for high optical transmission and lower Q-factor values at resonance. Transmission values of 0.17, 0.47 and 0.43 were obtained, together with Q-factor values of 1179.32, 930.05 and 970.35, respectively, without using tapered sections—while transmission values of 0.45, 0.74 and 0.43 were obtained, together with Q-factor values of 1083.24, 850.10 and 885.22, respectively, using tapered sections. (The normalisation values for the experiments were obtained with respect to an unstructured photonic wire). We have demonstrated that the taper structures used must be designed accurately, in order to maximize the transmission values at the desired resonance wavelengths. The demonstration of fabricated device structures that have measured properties that are in close agreement with predictions obtained using finite-difference time-domain (FDTD) computational software is an indication of the precision of the fabrication process. With the introduction of multiple cavities into the structures realised, the number of resonance wavelengths can be tailored for application as WDM components or other wavelength selective filters, such as arrayed-waveguide grating structures (AWGs) and Bragg gratings.

我们展示了产生多个共振波长的耦合腔一维光子晶体/光子线 (PhC/PhW) 结构的模拟和实验演示。几个腔的组合导致光谱响应的组合，该光谱响应表现出多个谐振波长，并可能导致波分复用 (WDM) 应用所需的波长控制。通过使用具有三个不同的同轴腔的结构，我们获得了三个不同的共振波长——符合不同共振波长的数量与腔的数量成正比的规则。实验性光子线波导结构的横截面尺寸为 600 nm（宽度）~260 nm（高度）——带有嵌入式光子晶体 (PhC) 微腔——全部基于绝缘体上硅 (SOI) 平台。嵌入式 PhC 结构经过定制，可提供 C 波段和 L 波段光纤通信范围内的共振波长。通过在多微腔结构中引入锥形，可以获得对应于 1534.87、1554.63 和 1594.86 nm 的 WDM 波长的三个谐振波长，而在没有锥形的情况下，谐振波长为 1645.60、1670.76 和 8696 nm。分别。我们已经观察到不对称的自由光谱范围 (FSR) 情况，具有不等的共振波长间隔。锥形区域还导致谐振时的高光传输和低 Q 因子值。在不使用锥形截面的情况下，分别获得了 0.17、0.47 和 0.43 的透射值，以及 1179.32、930.05 和 970.35 的 Q 因子值——同时获得了 0.45、0.74 和 0.43 的透射值，以及 Q 因子值1083.24、850.10 和 885.22，分别使用锥形截面。（实验的归一化值是相对于非结构化光子线获得的）。我们已经证明必须精确设计所使用的锥形结构，以便在所需的共振波长下最大化透射值。制造的器件结构的演示具有与使用有限差分时域 (FDTD) 计算软件获得的预测非常一致的测量特性，表明制造过程的精度。随着在结构中引入多个腔体，谐振波长的数量可以定制，以用作 WDM 组件或其他波长选择滤波器，例如阵列波导光栅结构 (AWG) 和布拉格光栅。