Transverse magnetic field impact on waveguide modes of photonic crystals

Document Type

Journal Article

Publication Title

Optics Letters

Publisher

Optica Publishing Group

Place of Publication

United States

School

School of Science

RAS ID

21973

Comments

Sylgacheva, D., Khokhlov, N., Kalish, A., Dagesyan, S., Prokopiv, A., Shaposhnikov, A., . . . Belotelov, V. (2016). Transverse magnetic field impact on waveguide modes of photonic crystals. Optic Letters, 41(16), 3813-3816. Available here

Abstract

This Letter presents a theoretical and experimental study of waveguide modes of one-dimensional magneto-photonic crystals magnetized in the in-plane direction. It is shown that the propagation constants of the TM waveguide modes are sensitive to the transverse magnetization and the spectrum of the transverse magneto-optical Kerr effect has resonant features at mode excitation frequencies. Two types of structures are considered: a non-magnetic photonic crystal with an additional magnetic layer on top and a magneto-photonic crystal with a magnetic layer within each period. We found that the magneto-optical non-reciprocity effect is greater in the first case: it has a magnitude of δ ∼ 10-4, while the second structure type demonstrates δ ∼ 10-5 only, due to the higher asymmetry of the claddings of the magnetic layer. Experimental observations show resonant features in the optical and magneto-optical Kerr effect spectra. The measured dispersion properties are in good agreement with the theoretical predictions. An amplitude of light intensity modulation of up to 2.5% was observed for waveguide mode excitation within the magnetic top layer of the non-magnetic photonic crystal structure. The presented theoretical approach may be utilized for the design of magneto-optical sensors and modulators requiring pre-determined spectral features

DOI

10.1364/OL.41.003813

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