(英)波导耦合回音壁模式光学微球腔结构耦合特性分析
Received:April 24, 2017  Revised:February 01, 2018  点此下载全文
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Author NameAffiliationE-mail
WANG Meng-yu Department of Precision Machinery and Precision Instrumentation,University of Science and Technology of China,Hefei,Anhui mengyu@mail.ustc.edu.cn 
JIN Xue-ying Department of Precision Machinery and Precision Instrumentation,University of Science and Technology of China,Hefei,Anhui  
Li Fei Department of Precision Machinery and Precision Instrumentation,University of Science and Technology of China,Hefei,Anhui  
ZHANG Yan-chao Information Optoelectronics Research Institute,Harbin Institute of Technology,Weihai,Shandong zhangyanchao66@sina.com 
WANG Ke-yi Department of Precision Machinery and Precision Instrumentation,University of Science and Technology of China,Hefei,Anhui kywang@ustc.edu.cn 
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:设计和优化了波导耦合及锥形光纤耦合的石英微球腔结构。通过波导耦合的相关的耦合理论,设计了一个专用的有限时域差分法(FDTD)的2D数值仿真系统。在快速傅里叶变换(FFT)处理样本数据后,得到了波长范围从600nm到1000nm的相对强度谱曲线和传输谱曲线。在实验中,采用熔融单模光纤顶端的方法制得了石英材料微球腔。采用热拉技术制得了锥形光纤,用来作为激发回音壁模式的波导。测试了微球腔-锥形光纤耦合系统,通过优化微球腔与锥形光纤的相对位置得到耦合系统的品质因数高达2.3×106,耦合效率达到92.5%。这些特性表明了其在实际微腔传感和微型激光器中极具潜力。
中文关键词:微纳光学  光学微球腔  波导光学  回音壁模式  时域有限差分法  耦合特性
 
Analysis for coupling characteristics of whispering gallery mode optical microsphere cavity coupled by a waveguide
Abstract:The silica-microsphere cavity structure coupled by a waveguide or a tapered fiber was designed and optimized. A dedicated two-dimensional (2D) numerical simulation exploits the coupled theory of waveguide coupling. The relative intensity and transmission spectra in the wavelength range from 600nm to 1000nm were acquired by processing the sample data after fast fourier transformation (FFT) with the finite difference time domain (FDTD) method. In the experiment, the silica-microspheres are fabricated by melting the tip of a single-mode optical fiber with the CO2 laser. The tapered fiber, fabricated by using the method of heat-and-pull technique, was chosen as waveguide to excite whispering gallery modes (WGMs). The silica microsphere-taper coupling system is tested and the results are given the indication that a very high-quality (Q) factor up to 2.3×106 and a high coupling efficiency up to 92.5% can be achieved by optimizing the microsphere position and orientation relative to the tapered fiber. Such properties show its potential for a potential application in practical microcavity sensors and micro-laser.
keywords:micro-nano optics  microsphere resonator  waveguide optics  whispering gallery modes  FDTD  coupling characteristics
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Copyright:《Journal of Infrared And Millimeter Waves》