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19 February 2009 Spectroscopy of photonic molecular states in supermonodispersive bispheres
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Strong coupling between whispering gallery modes (WGMs) is studied in polystyrene bispheres by using spatially resolved spectroscopy. The supermonodispersive pairs of spheres (size deviation <0.03%) were selected using their uncoupled WGM peaks' positions. By using novel geometries of capturing light by the imaging spectrometer we observed clear spectral signatures of strong coupling between WGMs for bispheres with mean sizes from 2.9 to 10 μm. In a special geometry with the collection of light along the axis of bisphere and with the slit of the spectrometer oriented perpendicular to the substrate we observed unusual and characteristic kites in the spectral images of such photonic molecules. We showed that such kites allow unambiguous relating of the split components (antibonding and bonding modes) in the spectral image to their WGM eigenstates in the uncoupled cavities. In many cases such kites simplify the interpretation of the dense spectral images of bispheres. Using various geometries of the experiments we quantified the dependence of coupling constant on the sizes of spheres for maximally coupled fundamental modes located in the equatorial planes of spheres on the substrate. The results show the feasibility of achieving a coherent WGM-based optical transport in microsphere resonator circuits.
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Seungmoo Yang and Vasily N. Astratov "Spectroscopy of photonic molecular states in supermonodispersive bispheres", Proc. SPIE 7194, Laser Resonators and Beam Control XI, 719411 (19 February 2009);

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