Integrated interferometric approach to solve microring resonance splitting in biosensor applications.
Integrated interferometric approach to solve microring resonance splitting in biosensor applications.
复制标题
集成干涉测量方法可解决生物传感器应用中的微环共振分裂问题。
DOI：
10.1364/oe.21.016955
复制
发表时间：
2013
期刊：
影响因子：
3.8
通讯作者：
P. Bienstman
中科院分区：
文献类型：
--
作者：
S. Werquin;S. Verstuyft;P. Bienstman
绝缘体上硅微环谐振器已被证明是无标记纳米光子生物传感器的绝佳平台。绝缘体上硅的高折射率对比度允许制造微米尺寸的传感器。然而，它也通过引入固有的模式分裂来限制共振的质量。小波导变化时的光功率反向散射提高了正常谐振器模式的简并性。这严重恶化了输出信号的质量，而输出信号的质量对于确定微环作为生物传感器的性能至关重要。我们建议采用集成干涉测量方法来获取微环谐振器的未分割的高质量法向模式，并通过实验证明品质因数提高了 3 倍。
Silicon-on-insulator microring resonators have proven to be an excellent platform for label-free nanophotonic biosensors. The high index contrast of silicon-on-insulator allows for fabrication of micrometer-size sensors. However, it also limits the quality of the resonances by introducing an intrinsic mode-splitting. Backscattering of optical power at small waveguide variations lifts the degeneracy of the normal resonator modes. This severely deteriorates the quality of the output signal, which is of utmost importance to determine the performance of the microrings as a biosensor. We suggest an integrated interferometric approach to give access to the unsplit, high-quality normal modes of the microring resonator and experimentally show an improvement of the quality factor by a factor of 3.