A new polarization beam splitter is proposed based on a photonic crystal ring resonator (PCRR) composed of honeycomb-lattice cylindrical silicon rods in air. By shrinking the width of the bus waveguide and adjusting the radii of two nearest-neighbor center rods of the PCRR, an unpolarized beam can be separated well into TE and TM polarization states, respectively, at the backward and forward output ports. Simulation results obtained by the two-dimensional finite-difference time-domain technique show that the insertion losses are 3.58 dB and 3.08 dB, and the polarization extinction ratios are 21.42 dB and 28.53 dB for TE and TM polarization, respectively, at a 1566.7 nm center wavelength. The excess loss is less than 0.34 dB and its dimensions are roughly 43.2 μm × 27.52 μm. These findings offer potential practical applications in high-density photonic integrated circuits.

中文翻译：

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基于蜂窝晶格光子晶体环谐振器的偏振分束器

提出了一种新的偏振分束器，其基于由空气中的蜂窝晶格圆柱形硅棒组成的光子晶体环形谐振器（PCRR）。通过缩小总线波导的宽度并调整 PCRR 的两个最近邻中心棒的半径，可以在后向和前向输出端口将未偏振光束很好地分离为 TE 和 TM 偏振态。通过二维有限差分时域技术获得的仿真结果表明，插入损耗为 3.58 dB 和 3.08 dB，TE 和 TM 偏振在 1566.7 nm 处的偏振消光比分别为 21.42 dB 和 28.53 dB中心波长。超额损耗小于 0.34 dB，其尺寸约为 43.2 μm × 27.52 μm。