Jiaqi Wang, Guoxian Wu, Si Chen, Zunyue Zhang, Hui Zhang, Xu Li, Penghao Ding, Chuxian Tan, Yu Du, Youfu Geng, Xuejin Li, Hon Ki Tsang, Zhenzhou Cheng
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引用次数: 0
Abstract
Subwavelength grating structures are widely used in integrated optical devices due to their compact footprints and flexible refractive index tailoring. In this paper, we present a subwavelength grating (SWG) coupler for a 70-nm-thick silicon waveguide without the upper cladding. The device was designed by using a particle swarm optimization algorithm in 3D finite-difference time-domain simulation. Experimental measurements show that the SWG coupler with a minimum feature size of ∼210 nm has a peak coupling efficiency of -7.0 dB with a 1-dB bandwidth of ∼40 nm and a backreflection of ∼-18.7 dB at 1550 nm wavelengths for transverse-electric polarized light. The ultrathin device structure is simple and reproducible, making it well suited for sensing and optoelectronic integration applications at low cost.
期刊介绍：
The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.
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