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Nadgaran H, Zolfaghari Ghorbani R, Pourmand R. Investigation of Fano resonance line shapes in coupling between single-mode optical fiber and WGM microresonator using diffraction grating. ICOP & ICPET _ INPC _ ICOFS 2018; 24 :909-912
URL: http://opsi.ir/article-1-1424-en.html
URL: http://opsi.ir/article-1-1424-en.html
1- Physics Dep. Shiraz University
2- Physics Dep. Estahban Higher Education Center
2- Physics Dep. Estahban Higher Education Center
Abstract: (2415 Views)
It has been demonstrated that, in vertical coupling structure between WGM microresonator and a single mode optical fiber using the metallic diffraction grating, Fano resonance line-shape depends on incident wave polarization. Under TE and TM polarization, Fano resonance line-shape are peak-dip resonance and dip-peak resonance respectively. Also, it is shown that by increasing the gap size between the diffraction grating and microresonator, the Q-factor increase and the on-off intensity difference of the reflection spectral line decrease continuously. This progressive trend of Q-factor continues until the gap size reaches 350 nm. Beyond that, the Fano resonance loses its ideal line-shape because of decreasing coupling strength. This optimum gap size can be exploited in near filed imagining of confocal microscopes.
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