Curved nanomembrane-based concentric ring cavities for supermode hybridization.
Authors of this article are:
Wang J, Yin Y, Hao Q, Yang YD, Valligatla S, Saei Ghareh Naz E, Li Y, Saggau CN, Ma L, Schmidt OG.
A summary of the article is shown below:
We report on the mode interactions and resonant hybridization in nanomembrane-formed concentric dual ring cavities supporting whispering gallery mode resonances. Utilizing a rolled-up nanomembrane with sub-wavelength thickness as an interlayer, dual concentric microring cavities are formed by coating high-index nanomembranes on the inner and outer surfaces of the rolled-up dielectric nanomembrane. In such a hybrid cavity system, the conventional fundamental mode resonating along a single ring orbit splits into symmetric and anti-symmetric modes confined by concentric dual ring orbits. Detuning of the coupled supermodes is realized by spatially resolved measurements along the cavity axial direction. A spectral anti-crossing feature is observed as a clear evidence of strong coupling. Upon strong coupling, the resonant orbits of symmetric and anti-symmetric modes cross over each other in the form of super-waves oscillating between the concentric rings with opposite phase. Notably, the present system provides high flexibilities in controlling the coupling strength by varying the thickness of the spacer layer and thus enables switching between strong and weak coupling regimes. Our work offers a compact and robust scheme using curved nanomembranes to realize novel cavity mode interactions for both fundamental and applied studies.
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