He Yu, Zhang Yong, Zhang Ruihuan, Sun Lu, Su Yikai
Opt Lett. 2021 Jan 15;46(2):194-197. doi: 10.1364/OL.403819.
An ultra-compact and broadband transverse magnetic (TM)-pass polarizer is experimentally demonstrated using a photonic crystal nanohole structure. By engineering the period of the circular holes, the fundamental transverse electric mode is suppressed due to the bandgap of the nanohole array, while the mode propagates with a negligible insertion loss. Simulation results predict that the bandwidth of the device can reach 245 nm with a 33 dB polarization extinction ratio (PER). In the experiment, an insertion loss <1.2 for the mode and a PER over 20.8 dB are demonstrated in a 70 nm wavelength range from 1520 to 1590 nm, mainly limited by the grating couplers used for fiber-to-chip coupling. The fabricated device is compact with a total length of 7.21 µm.
利用光子晶体纳米孔结构通过实验展示了一种超紧凑宽带横向磁（TM）通偏振器。通过设计圆形孔的周期，由于纳米孔阵列的带隙，基本横向电模式被抑制，而TM模式以可忽略不计的插入损耗传播。模拟结果预测，该器件的带宽可达245nm，偏振消光比（PER）为33dB。在实验中，在1520至1590nm的70nm波长范围内展示了TM模式的插入损耗<1.2dB以及超过20.8dB的PER，主要受用于光纤到芯片耦合的光栅耦合器限制。所制造的器件紧凑，总长度为7.21μm。
