Lim Kok Sing, Jasim Ali A, Damanhuri Siti S A, Harun Sulaiman W, Rahman B M Azizur, Ahmad Harith
Photonics Research Center, Department of Physics, University of Malaya, 50603 Kuala Lumpur, Malaysia.
Appl Opt. 2011 Oct 20;50(30):5912-6. doi: 10.1364/AO.50.005912.
Effects of immersing a microfiber knot resonator (MKR) in liquid solutions that have refractive indices close to that of silica are experimentally demonstrated and theoretically analyzed. Significant improvement in resonance extinction ratio within 2 to 10 dB was observed. To achieve a better understanding, a qualitative analysis of the coupling ratio and round-trip attenuation of the MKR is performed by using a curve-fitting method. It was observed that the coupling coefficient at the knot region increased when immersed in liquids. However, depending on the initial state of the coupling and the quantity of the increment in the coupling coefficient when immersed in a liquid, it is possible that the MKR may experience a deficit in the coupling parameter due to the sinusoidal relationship with the coupling coefficient.
实验证明并理论分析了将微纤维结谐振器（MKR）浸入折射率接近二氧化硅的液体溶液中的效果。观察到共振消光比有2至10分贝的显著改善。为了更好地理解，通过使用曲线拟合方法对MKR的耦合比和往返衰减进行了定性分析。观察到当浸入液体中时，结区域的耦合系数增加。然而，根据耦合的初始状态以及浸入液体时耦合系数的增量大小，由于与耦合系数的正弦关系，MKR可能会出现耦合参数不足的情况。
