Abstract
A miniature polarimetric interferometer with the twist of a highly-birefringent microfiber is demonstrated. Good transmission spectral characteristics, which are co-governed by the birefringence and the twist degree of the microfiber, are investigated. The structure exhibits extremely-high sensitivity of around 24,373 nm per refractive-index unit and excellent temperature stability of better than 0.005 nm/°C. Featured with compactness, reconfigurability, stability, robustness, and compatibility with other fiberized components, our device has potential in tunable filtering, sensing, multi-wavelength lasing, and etc.
Highlights
Polarimetric interferometer that employs separation and interference of orthogonally polarized states of light has great application potential in tunable comb filtering, sensing, multiwavelength lasing, nonlinear resonating, and etc
Various compact microfiber devices in the form of loops/knots [2,3], coils [4,5], or reflectors [6,7,8] have been implemented. All those previous configurations basically rely on the resonance or reflection of optical cavity without consideration of polarization properties, which yields refractive index (RI) sensitivity of up to 103 nm/RI-unit [4]
To understand the spectral characteristics of the highly-birefringent microfiber (HBMF) loop, the touching of microfibers can correspond to a strong light coupling due to the very large evanescent field effects [1,2,3,4,5,6,7,8,9,10]
Summary
Polarimetric interferometer that employs separation and interference of orthogonally polarized states of light has great application potential in tunable comb filtering, sensing, multiwavelength lasing, nonlinear resonating, and etc. Various compact microfiber devices in the form of loops/knots [2,3], coils [4,5], or reflectors [6,7,8] have been implemented. All those previous configurations basically rely on the resonance or reflection of optical cavity without consideration of polarization properties, which yields refractive index (RI) sensitivity of up to 103 nm/RI-unit [4]. The designed structure is featured with reconfigurability, stability, robustness, and compatibility with other fiberized components
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