华中科技大学 武汉光电国家研究中心, 湖北 武汉 430074
利用有限时域差分方法设计并优化了由二氧化硅和氮化硅组成的双层和三层减反射膜, 在1550nm波长附近实现减反射效果。采用等离子增强化学气相沉积高质量的二氧化硅和氮化硅薄膜, 制备了氧化硅、氮化硅双层减反射膜, 同时制备了氮化硅、氧化硅、氮化硅三层减反射膜。测量了两种减反射膜的减反射效果, 双层减反射膜的反射率可以达到0.18%以下, 三层减反射膜比双层减反射膜具有更大的带宽。
薄膜光学 减反射膜 有限时域差分 等离子增强化学气相沉积 film optics antireflective coatings FDTD PECVD
Author Affiliations
Abstract
1 Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
2 e-mail: huangqz@mail.hust.edu.cn
3 e-mail: jsxia@hust.edu.cn
We have designed and realized an athermal 4-channel wavelength (de-)multiplexer in silicon nitride (SiN). Minimized thermal sensitivity is achieved in a wide wavelength range by using wide and narrow waveguides with low and different thermal-optic coefficients in the two arms of Mach–Zehnder interferometers (MZIs). The SiN core layer and SiO2 cladding layers are deposited by a low-temperature plasma-enhanced chemical vapor deposition process. The fabricated MZI filter exhibits a thermal sensitivity within ±2.0 pm/°C in a wavelength range of 55 nm to near 1300 nm. Then, an athermal (de-)multiplexer based on cascaded MZIs has been demonstrated with a crosstalk ≤ 22 dB and a thermal sensitivity <4.8 pm/°C for all four channels, reduced by 77% compared to a conventional SiN (de-)multiplexer. Owing to the passive operation and compatibility with the CMOS backend process, our devices have potential applications in 3D integration of photonics and electronics.
Integrated optics devices Wavelength filtering devices Photonics Research
2018, 6(7): 07000686
