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Nadgaran H, Owshani S, Pourmand R. Comparison of light-microresonator coupling in both side-grating and end-grating structures to control the excitation of higher radial order WGMs . ICOP & ICPET _ INPC _ ICOFS 2018; 24 :557-560
URL: http://opsi.ir/article-1-1592-en.html
URL: http://opsi.ir/article-1-1592-en.html
1- Physics Dep. Shiraz University, Shiraz 71454, Iran
2- Physics Dep. Estahban Higher Education Center, Estahban, Iran
2- Physics Dep. Estahban Higher Education Center, Estahban, Iran
Abstract: (2020 Views)
In this work for the first time excitation of higher radial order WGMs has been investigated using a metallic grating coupler located on the side of optical fiber (side-grating). The results have been compared with another structure in which grating is put on the end of fiber (end-grating). The results which is understood by phase-matching conditions, show that Q-factor in both side-grating and end-grating is 1.03×104 and 1.7×104 respectively. The noticeable point is that excitation of a specific radial mode is controllable in side-grating structure while it can’t be controlled easily in end-grating structure. The reason stems from the fact that in end-grating structure, light diffraction and reflection from end-grating itself remarkably reduce the excitation control of WGMs. Since some photonic applications require a particular mode to be excited, the side-grating structure is more preferable than the end-grating structure.
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