电子科技大学 光电信息学院, 四川 成都 610054
通过模拟仿真, 研究了基于绝缘衬底上的硅(Silicon-On-Insulator, SOI)的微环生物传感器的传感性能, 得出其体传感灵敏度为38.71 nm/RIU, 探测极限为1.8×10-3 RIU, Q值为2.22×104。基于该结构, 分析了噪声对传感器性能的影响, 包括光源噪声和温度噪声。为了降低噪声影响, 设计了具有参考和探测通道的双微环差分传感器, 通过差分运算扣除噪声引起的谐振波长漂移, 从而可以有效降低噪声对传感器探测结果的影响。通过数值模拟和计算, 其被探测物的折射率变化的相对误差减小了15.85%, 表明微环差分传感器可以有效降低噪声的影响, 对提高微环生物传感器的性能将有极大的促进作用。
集成光学 光子传感 微环生物传感器 回音壁模式 差分降噪 integrated optics optical sensing micro-ring biosensor whispering gallery mode differential noise reduction 红外与激光工程
2018, 47(2): 0222002
Author Affiliations
Abstract
School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China
Optical biosensors with a high sensitivity and a low detection limit play a highly significant role in extensive scenarios related to our daily life. Combined with a specific numerical simulation based on the transfer matrix and resonance condition, the idea of novel single-waveguide-based microresonators with a double-spiral-racetrack (DSR) shape is proposed and their geometry optimizations and sensing characteristics are also investigated based on the Vernier effect. The devices show good sensing performances, such as a high quality factor of 1.23×105, a wide wavelength range of over 120 nm, a high extinction ratio (ER) over 62.1 dB, a high sensitivity of 698.5 nm/RIU, and a low detection limit of 1.8×10 5. Furthermore, single-waveguide-based resonators can also be built by cascading two DSR structures in series, called twin-DSRs, and the results show that the sensing properties are enhanced in terms of quasi free spectral range (FSR) and ER due to the double Vernier effect. Excellent features indicate that our novel single-waveguide-based resonators have the potential for future compact and highly integrated biosensors.
280.1415 Biological sensing and sensors 230.5750 Resonators 230.3990 Micro-optical devices 230.3120 Integrated optics devices Chinese Optics Letters
2017, 15(1): 010006
