Share Email Print
cover

Proceedings Paper

Single domain magneto-optical circulators in photonic crystals
Author(s): Zheng Wang; Shanhui Fan
Format Member Price Non-Member Price
PDF $17.00 $21.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

During the past decade, defect engineering in photonic crystals has successfully miniaturized many optical devices, such as optical filters and lasers, to a sub-wavelength scale. In the field of magneto-optics, previous researches on one-dimensional photonic crystals have demonstrated that magnetic cavities can be used to create Friday rotation in sub-wavelength optical paths, important for integrated optical isolators. In this paper, we study an optical circulator formed of a bismuth-iron-garnet defect infiltrated in a two dimensional silicon photonic crystal. The additional dimension of the field confinement allows further miniaturization and paves the way for monolithic in-plane integration with current integrated optical devices. The magneto-optical defect is constructed to support two doubly-degenerate TE modes and side-coupled to three photonic-crystal waveguides to form a three-port Y-junction circulator. When maximized with geometrically-optimized bismuth-iron-garnet domain, the gyrotropic effects cross couple the two modes and split them into a pair of counter-spinning states. We use the coupled-mode theory to derive the general criterion between the magneto-coupling and resonance decay constant for complete transmission and isolation. Numerical experiments with finite-difference time-domain methods confirmed the coupled mode theory and demonstrate a Y-junction circulator with an isolation ratio greater than 40dB. The design principle for this two dimensional photonic crystal defect can be readily transferred to magneto-optical defects in three dimensional slab photonic crystals. The silicon/air based system has a small footprint of one wavelength squared and good compatibility for integration with other planar optical devices.

Paper Details

Date Published: 12 September 2005
PDF: 10 pages
Proc. SPIE 5926, Tuning the Optical Response of Photonic Bandgap Structures II, 59260M (12 September 2005); doi: 10.1117/12.614007
Show Author Affiliations
Zheng Wang, Stanford Univ. (United States)
Shanhui Fan, Stanford Univ. (United States)


Published in SPIE Proceedings Vol. 5926:
Tuning the Optical Response of Photonic Bandgap Structures II
Philippe M. Fauchet; Paul V. Braun, Editor(s)

© SPIE. Terms of Use
Back to Top