High Coupling Efficiency Surface Illuminated 2D Metasurface Waveguide Coupler for Mid-IR Wavelengths

被引:1
作者
Bilal, Asif [1 ]
Younis, Usman [1 ]
机构
[1] Informat Technol Univ, Dept Elect Engn, Arfa Software Technol Pk, Lahore 54000, Pakistan
来源
INTEGRATED OPTICS: DESIGN, DEVICES, SYSTEMS, AND APPLICATIONS V | 2019年 / 11031卷
关键词
Metasurface; Mid-infrared; Waveguides; Optical Devices; REFLECTORS;
D O I
10.1117/12.2520405
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
The design of 2D metasurface integrated with strip waveguide in SOI to achieve high coupling efficiency for 3.8 mu m wavelength is presented. The metasurface design has been achieved using a commercial FDTD and the high coupling efficiency has been achieved by systematically optimizing the radius of circularly shaped unit cells and period between them by performing 3D FDTD simulations. The effective coupling efficiency is the performance metric in our case and it is defined as the ratio of the light coupled into strip waveguide to the difference of the light illuminated on the surface and the light reflected back due to interface. The effective coupling efficiency achieved for the designed 2D metasurface integrated with waveguide is similar to 98% in the in-plane waveguide for the out-of-plane surface illumination. The achieved bandwidth of the structure is 1 mu m. We believe our design is a good alternative for conventionally employed grating coupler and inverse taper. The integrated design also helps mitigate inefficient coupling using mid-IR fibers currently available and is consistent with the available lithography using 400 nm thick SOI for mid-IR applications. The monolithic integration can also be achieved using standard multi-project wafer (MPW) run.
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页数:9
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