Hybrid graphene/silicon integrated optical isolators with photonic spin-orbit interaction
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AbstractOptical isolators are an important building block in photonic computation and communication. In traditional optics, isolators are realized with magneto-optical garnets. However, it remains challenging to incorporate such materials on an integrated platform because of the difficulty in material growth and bulky device footprint. Here, we propose an ultracompact integrated isolator by exploiting graphene's magneto-optical property on a silicon-on-insulator platform. The photonic nonreciprocity is achieved because the cyclotrons in graphene experiencing different optical spins exhibit different responses to counterpropagating light. Taking advantage of cavity resonance effects, we have numerically optimized a device design, which shows excellent isolation performance with the extinction ratio over 45 dB and the insertion loss around 12 dB at a wavelength near 1.55 mu m. Featuring graphene's CMOS compatibility and substantially reduced device footprint, our proposal sheds light on monolithic integration of nonreciprocal photonic devices. (C) 2016 AIP Publishing LLC.
All Author(s) ListMa JW, Xi X, Yu ZJ, Sun XK
Journal nameApplied Physics Letters
Year2016
Month4
Day11
Volume Number108
Issue Number15
PublisherAMER INST PHYSICS
ISSN0003-6951
eISSN1077-3118
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesPhysics; Physics, Applied

Last updated on 2020-24-10 at 03:00