Volume 24 -                   ICOP & ICPET _ INPC _ ICOFS 2018, 24 - : 909-912 | Back to browse issues page

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Investigation of Fano resonance line shapes in coupling between single-mode optical fiber and WGM microresonator using diffraction grating
Hamid Nadgaran * 1, Reza Zolfaghari Ghorbani1 , Raheleh Pourmand2
1- Physics Dep. Shiraz University
2- Physics Dep. Estahban Higher Education Center
Abstract:   (2437 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.
Keywords: Fano resonance, vertical coupling, Microresonator WGM
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Type of Study: Research | Subject: Special
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