Magneto-optical circulator in two-dimensional photonic crystals
Citation
Zheng Wang and Shanhui Fan, "Magneto-optical Circulator in Two-dimensional Photonic Crystals," in Photonic Crystal Materials and Devices IV, edited by Ali Adibi, Shawn-Yu Lin, Axel Scherer, Proc. of SPIE Vol. 6128, 61280D (2006), doi: 10.1117/12.646874.
Keywords
- Magneto-optics
- Integrated optics
- Nonreciprocity
- Optical circulator
- Photonic crystals
- Optical resonators
- Iron garnets
- Miniaturization
- Wavelength scale
- Photonic crystal resonances
- Field localization
- Magnetic bias
- Voigt configuration
- Magnetic domain design
- Standing-wave eigenstates
- Two-dimensional photonic crystal cavities
- Two-dimensional slab structures
- Three-port junction circulator
- Bismuth-iron-garnet (BIG)
- Finite-difference time-domain (FDTD)
Brief
This article proposes a systematic method to miniaturize magneto-optical circulators down to the wavelength scale using photonic crystal resonances, and demonstrates a three-port junction circulator with a 30dB isolation bandwidth well over 100GHz.
Summary
This article proposes a new way to make very small (wavelength-scale) optical circulators using magneto-optical effects in photonic crystals. The design uses photonic crystal resonances to enhance nonreciprocal light transport and demonstrates a three-port circulator made of bismuth-iron-garnet that achieves a 30dB isolation bandwidth over 100GHz. This miniaturization is important for integrated optical systems by preventing reflections and allowing unidirectional signal flow. The design also discusses the crucial role of an optimized magnetic domain structure to maximize the magneto-optical coupling and uses temporal coupled-mode theory for analysis, which is validated by numerical simulations.
Origin: https://sci.bban.top/pdf/10.1117/12.646874.pdf#