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Polarization Effects in Microfiber Loop and Knot Resonators

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5 Author(s)
Guanghui Wang ; Network Technol. Res. Centre, Nanyang Technol. Univ., Singapore, Singapore ; Shum, P.P. ; Tong, Limin ; Chang Ming Li
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We theoretically investigate the polarization effect of three-dimensional (3-D) microfiber/nanofiber (MNF) loop resonators and knot resonators. Due to the lack of circular symmetry, the coupling at the joint regions of loop resonator and knot resonator are highly polarization-dependent. Using Jones matrices to express coupling coefficients, we suggest a matrix formula to describe the propagation of arbitrary polarized incidence through the resonator. Thereby, the polarization effect of 3-D loop resonators and knot resonators can be comprehensively investigated. We find that the polarization properties of the resonance spectrum and Q -factor are strongly dependent on the parameters of the twisted region. Results obtained in this work may serve as helpful guidelines for MNF resonator design and fabrication.

Published in:

Photonics Technology Letters, IEEE  (Volume:22 ,  Issue: 8 )