栅栏
光学
光束转向
占空比
材料科学
闪耀光栅
波束宽度
电磁感应光栅
全息光栅
物理
光电子学
梁(结构)
衍射光栅
电压
电信
量子力学
计算机科学
天线(收音机)
作者
Kuanping Shang,Chuan Qin,Zhangjun Yu,Guangyao Liu,Xian Xiao,Shui Feng,S. J. B. Yoo
出处
期刊:Optics Express
[The Optical Society]
日期:2017-08-07
卷期号:25 (17): 19655-19655
被引量:36
摘要
We report on uniform emission intensity profile, uniform propagation constant silicon gratings for beam steering application with ultra-sharp instantaneous field-of-view (IFOV). To achieve uniform emission intensity across relatively long emission length, we designed a custom grating with varying Si3N4 width and duty cycle while maintaining a uniform propagation constant for relatively narrow divergence emission pattern. We designed and fabricated the custom Si3N4/Si grating with the varying Si3N4 width/duty cycle together with the reference Si3N4/Si grating with a constant 50:50 duty cycle. The custom grating demonstrated the beam steering angle value of 6.6° by sweeping wavelength between 1530 nm and 1575 nm with the emission length over 1 mm. The measured IFOV based on the 3-dB beamwidth values of the far field patterns for the TE polarization are 0.10° and 0.75° for the custom grating and for the reference grating, respectively. The custom grating also indicates mode-selective behavior due to the perturbation of propagation constant for input modes other than TE polarization. The measured TE-mode to TM-mode suppression ratio for the custom grating is approximately 8.2 dB peak-to-peak measured at far field.
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