Senthil Murugan G, Petrovich M N, Jung Y, Wilkinson J S, Zervas M N
Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK.
Opt Express. 2011 Oct 10;19(21):20773-84. doi: 10.1364/OE.19.020773.
Selective excitation of whispering-gallery and bottle modes in a robust hollow-bottle optical microresonator, fabricated from a silica microcapillary by a pressure-compensated, "soften-and-compress" method, is demonstrated. Characteristic resonance spectra of bottle modes were obtained by using a tapered fiber coupled at different locations along the hollow bottle. The spectral characteristics (Q-factor, excitation efficiency) are shown to have high tolerance to angular misalignment of the tapered fiber. In addition, introduction of localized losses on the outer surface of the resonator results in selective clean-up of the transmission spectrum and superior performance. A theoretical analysis of modal turning points and associated resonant wavelengths is used to explain the mechanism of mode-suppression and the resultant spectral cleaning.
通过压力补偿的“软化和压缩”方法，由二氧化硅微毛细管制造出坚固的空心瓶光学微谐振器，实现了回音壁模式和瓶模式的选择性激发。通过使用沿空心瓶不同位置耦合的锥形光纤，获得了瓶模式的特征共振光谱。结果表明，光谱特性（品质因数、激发效率）对锥形光纤的角度失准具有高耐受性。此外，在谐振器外表面引入局部损耗会导致传输光谱的选择性清理和卓越性能。利用模态转折点和相关共振波长的理论分析来解释模式抑制机制和由此产生的光谱清理。
