Inverse-design algorithms can be used to design compact and high-performance complex photonic structures. In this study, we propose the design of an all-dielectric optical resonator based on the concept of the parallel mirror resonator by using the objective-first inverse design algorithm. Light is strongly confined using a predefined objective function that creates symmetric mirror regions acting as reflective layers for the fundamental transverse-electric polarization mode. Thanks to the flexibility of the algorithm, segments of the cavity and dielectric mirror are designed in a simulation region by choosing a cavity of an appropriate length. A time-domain analysis of the proposed structure was carried out using the two-dimensional finite-difference time-domain method. The proposed structure has a configuration with a footprint of 13.394 × 0.592 μm². The algorithm generates an inverse-designed structure to obtain a resonance peak at the target wavelength without any intuitive scanning of the complete parameter space. As a result, the first-order mode is strongly localized in the region of the cavity for the defined design wavelength. Moreover, the application of the inversely designed resonator as refractive index sensor is examined to show that the proposed structure has the potential for use in integrated photonic devices. Thus, the objective-first inverse design algorithm is promising for use in the design of a variety of photonic structures.

逆设计算法可用于设计紧凑且高性能的复杂光子结构。在这项研究中，我们基于物镜优先逆设计算法，基于平行镜谐振器的概念，提出了一种全电介质光学谐振器的设计方案。使用预定义的目标函数严格限制光，该函数创建对称的镜面区域，用作基本横向电偏振模式的反射层。由于算法的灵活性，通过选择适当长度的腔体，可以在模拟区域中设计腔体和介电镜的分段。使用二维时域有限差分法对提出的结构进行了时域分析。所提出的结构具有占地13.394×0的配置。²。该算法生成逆设计的结构，以在目标波长下获得共振峰，而无需对整个参数空间进行任何直观的扫描。结果，对于所定义的设计波长，一阶模强烈地位于腔的区域中。此外，检查了反向设计的谐振器作为折射率传感器的应用，以表明所提出的结构具有用于集成光子器件的潜力。因此，物镜优先逆设计算法有望用于各种光子结构的设计中。