Multimodal and birefringence effects in magnetic photonic crystals |
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| Institution: | 1. Physics Department, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, USA;2. Materials Science Department, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, USA;1. Functional Electronics Laboratory, Tomsk State University, Tomsk 634050, Russia;2. Nanolectronics and Nanophotonics Laboratory, Tomsk State University, Tomsk 634050, Russia;3. General Physics Department, Kemerovo State University, Kemerovo 650043, Russia;4. Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russia;5. Laboratory of Semiconductor and Dielectric Materials, Novosibirsk State University, Novosibirsk 630090, Russia;1. School of Electronic Engineering, Xi’an University of Posts and Telecommunications, Xi’an 710121, China;2. State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China;1. College of Physical Science and Technology, Guangxi Normal University, Guilin 541004, China;2. College of Electronic Engineering, Guangxi Normal University, Guilin 541004, China;1. Functional Electronics Laboratory, Tomsk State University, Tomsk 634050, Russia;2. Nanoelectronics and Nanophotonics Laboratory, Tomsk State University, Tomsk 634050, Russia;3. Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russia;4. Laboratory of Semiconductor and Dielectric Materials, Novosibirsk State University, Novosibirsk 630090, Russia |
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| Abstract: | Photon trapping in magnetic photonic crystals leads to an enhanced Faraday rotation by increasing the optical path-length of the transmitted beam. The integration of these structures into on-chip photonic circuits, while advantageous from the point of view of component connectivity in multifunctional systems, faces several challenges. Photonic waveguide structures in magnetic films may support more than one mode depending on the waveguide thickness and refractive index. Differences in effective refractive indices between TE and TM modes engender phase disparities, thus hindering the Faraday response of the material. The effects of birefringence and multimodality on the performance of waveguide magnetic photonic crystals in magnetic garnets are addressed in paper. In particular, Faraday rotation enhancement in magnetophotonic crystals in the presence of waveguide birefringence and modal multiplicity on the photonic bandgap spectral response are discussed. Multiple stopbands and significant polarization rotation are observed in multimode Bi-substituted iron garnet film waveguides with single-defect photonic crystal structures. The photonic crystals for this study are patterned on ridge waveguide films by focused-ion-beam (FIB) milling. |
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