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摘要

微瓶腔在腔动力学、非线性光学、高灵敏度传感和微型激光器等领域具有非常大的应用潜力. 首先, 从亥姆霍兹方程出发, 详细研究了微瓶腔中的模式场分布理论. 利用电弧放电加工方法, 制备了扁长型微瓶腔. 其次, 采用光纤锥波导耦合方式有效激发了微瓶腔中的径向模式和轴向模式, 并且通过调节微瓶腔与波导的耦合间隙, 实现了对微瓶腔的欠耦合、临界耦合和过耦合三种耦合状态控制. 实验中, 光谱中回音壁模式得到很好的模式定位和识别, 最大品质因子 Q值达到1.78 × 10 ⁸. 通过采用接触式耦合来增强调谐的稳定性, 控制不同的耦合位置实现了谐振模式选择性激发, 得到了稳定并且干净的谐振光谱. 最后, 通过选择光纤锥波导直径观察到了Fano谐振效应. 所展示的结果对增强微腔传感、非线性光学和腔动力学等应用有重要意义.

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Abstract

Optical microresonators supporting whispering-gallery modes have been intensively studied in past decades due to their practical applications ranging from fundamental science to engineering physics. Among such microresonators, microsphere resonators have been demonstrated to possess ultra-high quality ( Q) factor, however, their shapes usually become non-standard spherical body, leading to irregular resonant spectra. Microring resonators have unique potential in integraibility on chip, but the fabrication imperfection limits their Q-factor only to 10 ⁶. In addition, the free spectral range (FSR) just depends on their radius. Due to the advantages of high Q-factor, standard shape, slender mode field distribution, the microbottle resonators are demonstrated to possess excellent performance in cavity quantum dynamics, nonlinear optics, high-sensitivity sensing, and micro-laser. In this paper, we carry out a systematic study on the spectral characteristics of prolate microbottle resonator theoretically and experimentally. First, theoretically, the field distribution theory of the microbottle resonator is studied in detail based on Helmholtz equation. Experimentally, prolate microbottle resonators are fabriated via arc discharge technology. Second, the radial modes and axial modes of the microbottles are efficiently excited with the help of a coupled tapered fiber waveguide. By adjusting the coupling gap between the microbottle and the waveguide, The controlling of three cupling states i.e. undercoupling, critical coupling and overcoupling are realized. In our experiment, the whispering-gallery modes excited are identifiable and recognizable. The resonant mode with an ultra-high Q-factor of up to 1.78 × 10 ⁸is achieved. The characteristic of ultra-high Q-factor makes the microbottle hold great potential in biochemical sensing, nonlinear optics, and micro-laser. The tuning stability is enhanced by keeping the waveguide in touch with the microbottle. We investigate the selective excitation of whispering-gallery modes by adjusting different coupling points. As a result, clean spectra with robust coupling are observed. The stable device is suitable for improving the sensing performance. Finally, Fano resonance effect is obtained by choosing the diameter of the tapered fiber waveguide. The results presented in this paper will be of great significance for enhancing the sensing, nonlinear optics and cavity quantum dynamics.

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作者及机构信息

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通信作者:吴涛,wutccnu@nchu.edu.cn; 王克逸,kywang@ustc.edu.cn

基金项目:国家自然科学基金(批准号: 61775209, 41871229, 61275011)和江西省重点研发计划(批准号: 20192BBH80019)资助的课题

Authors and contacts

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Corresponding author:Wu Tao,wutccnu@nchu.edu.cn; Wang Ke-Yi,kywang@ustc.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 61775209, 41871229, 61275011) and the Key Research and Development Program of Jiangxi Province, China (Grant No. 20192BBH80019)

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参考文献

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施引文献

下载: 全尺寸图片幻灯片

	实验数据FSR/nm	理论数据FSR/nm	误差%		实验数据FSR/nm	理论数据FSR/nm	误差%
FSR_m,1	3.718	3.618	2.76	FSR_q,1	1.232	1.204	2.33
FSR_m,2	3.708	3.636	1.98	FSR_q,2	1.241	1.206	2.59
FSR_m,3	3.716	3.626	2.48	FSR_q,3	1.239	1.208	2.57
FSR_m,4	3.732	3.643	2.44	FSR_q,4	1.238	1.210	2.31
FSR_m,5	3.636	3.616	0.55	FSR_q,5	1.237	1.212	2.06
FSR_m,6	3.718	3.632	2.37	FSR_q,6	1.239	1.214	2.06

下载: 导出CSV

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