Abstract
A double-cavity, Whispering-Gallery-Mode (WGM) resonator, composed of two polystyrene microspheres, is formed inside the capillary of a microstructured optical fiber. The spectra are compared with the corresponding WGM patterns of the isolated microspheres. We collect scattering spectra from the contact area between the two beads, as the spacing between them is varied, and the evolution of the modes with sphere separation is discussed. Potential applications of the presented optical design are also proposed.
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Acknowledgements
Kyriaki Kosma was supported by the framework of the IKY Fellowships of Excellence for Postgraduate Studies in Greece-Siemens Program (Contr. Number SR22078/13). This work was supported in part through H2020 Laserlab Europe (EC-GA 654148). The authors would like to acknowledge Dr. Maria Konstantaki for providing the Fiber-Bragg-Grating.
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Kosma, K., Schuster, K., Kobelke, J. et al. An “in-fiber” Whispering-Gallery-Mode bi-sphere resonator, sensitive to nanometric displacements. Appl. Phys. B 124, 1 (2018). https://doi.org/10.1007/s00340-017-6866-9
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DOI: https://doi.org/10.1007/s00340-017-6866-9