Method for achieving magneto-induced non-reciprocity in resonant silicon waveguides when their mirror symmetry is violated

For Russian citation (Opticheskii Zhurnal):

Юхтанов Н.Г., Рыбин М.В. Способ достижения магнето-индуцированной невзаимности в резонансных кремниевых волноводах при нарушении их зеркальной симметрии // Оптический журнал. 2024. Т. 91. № 3. С. 124–134. http://doi.org/10.17586/1023-5086-2024-91-03-124-134

Iukhtanov N.G., Rybin M.V. Method for achieving magneto-induced non-reciprocity in resonant silicon waveguides when their mirror symmetry is violated [in Russian] // Optickhesii Zhurnal. 2024. V. 91. № 3. P. 124–134. http://doi.org/10.17586/1023-5086-2024-91-03-124-134

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Non-reciprocal phase shifters on a chip based on resonant silicon waveguides with an applied magnetic field perpendicular to the chip plane. Aim of study. Developing a method for achieving magneto-induced non-reciprocity in resonant silicon waveguides due to uncompensated integral transverse rotation of electric fields in volume by violating the mirror symmetry of waveguides and an applied external magnetic field in Voigt geometry. Method. Breaking the mirror symmetry of the waveguides, the effect of transverse rotation of the electric fields of the operating modes is observed. By applying a magnetic field in the Voigt geometry, a non-reciprocal phase accumulates when light propagates through the waveguide, which is calculated using stationary perturbation theory. Main results. Three designs of silicon waveguides have been proposed with broken mirror symmetry to create compact magneto-induced phase shift elements integrated on a chip. As a result of waveguide eigenfrequencies modeling in COMSOL Multiphysics, effective indicators of the integral transverse rotation of electric fields in one direction in silicon waveguides are obtained, which allows us to fold waveguides into a serpentine shape on a chip with an area of less than 1 mm² according to the estimations of authors. Practical significance. Such nanostructures are based on commercially available silicon-on-insulator wafers with a standard thickness of 220 nm. The serpentine bending of the waveguides under study allows them to be used as on-chip non-reciprocal phase shifters. The proposed phase shifters are expected to be easily integrated into optoelectronic circuits due to compatibility with the standard complementary metal–oxide–semiconductor electronic technology. Moreover, the proposed technology is expected to be cheap due to the low price of neodymium magnets, which are used to create a stationary external magnetic field.

Keywords:

resonant waveguide, photonic integrated circuit, magneto-induced non-reciprocity, phase shifter, photonic crystal

Acknowledgements:

this work was supported by the Russian Science Foundation, project № 21-19-00677

OCIS codes: 230.0230

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