Han Xu, Cheng Rui, Huang Liang, Yu Panpan, Feng Lantian, Ren Guanghui, Mitchell Arnan, Tian Yonghui, Ren Xifeng, Xia Haojie
Opt Lett. 2024 Apr 1;49(7):1774-1777. doi: 10.1364/OL.517103.
An ultra-broadband TM-pass polarizer is designed, fabricated, and experimentally demonstrated based on subwavelength grating (SWG) metamaterials in a lithium niobate on an insulator (LNOI) platform. According to our simulation, the designed device is predicted to work at a 220 nm wavelength range from 1460 to 1680 nm, covering the S-, C-, L-, U-bands of optical fiber communication. By depositing and subsequently etching a silicon nitride thin film atop the LNOI chip, the SWG structures are formed successfully by using complementary metal-oxide semiconductor (CMOS)-compatible fabrication processes. The measured results show a high polarization extinction ratio larger than 20 dB and a relatively low insertion loss below 2.5 dB over a 130 nm wavelength range from 1500 to 1630 nm, mainly limited by the operation bandwidth of our laser source.
基于绝缘体上铌酸锂（LNOI）平台中的亚波长光栅（SWG）超材料，设计、制造并通过实验演示了一种超宽带横磁（TM）偏振器。根据我们的模拟，所设计的器件预计可在1460至1680 nm的220 nm波长范围内工作，覆盖光纤通信的S、C、L、U波段。通过在LNOI芯片顶部沉积并随后蚀刻氮化硅薄膜，利用互补金属氧化物半导体（CMOS）兼容制造工艺成功形成了SWG结构。测量结果表明，在1500至1630 nm的130 nm波长范围内，具有大于20 dB的高偏振消光比和低于2.5 dB的相对低插入损耗，主要受我们激光源的工作带宽限制。
