Optical isolator based on mode conversion in magnetic garnet films

Abstract

Calculations are presented describing a novel optical isolator which works by complete TE(0)-TM(0) mode conversion in magnetic garnet films caused by stress-induced optical anisotropy (50%) and by Faraday rotation (50%). These conversions take place along two different, perpendicular light paths in the same crystal that are connected by an integrated mirror. Possible tolerances of the film parameters are given so that a 30-dB isolation is still guaranteed.

Atomistic and ab initio DFT modelling of the defect structures in Al3+/Cr3+-doped and co-doped Y3Fe5O12

“…Yttrium iron garnet (YIG) of the composition Y3Fe5O12 is an attractive material that has been extensively used in areas such as telecommunication, microwave and magneto-optical recording industries [1,2]. Figure 1 shows the compound to have bcc unit cell (space group ; no.…”

Nonreciprocal TE–TM Mode Conversion Based on Photonic Crystal Fiber of Air Holes Filled With Magnetic Fluid Into a Terbium Gallium Garnet Fiber

“…As is known, the first design concept of an integrated isolator was based on nonreciprocal TE-TM mode conversion. Actually, most proposals of the waveguide type isolators are based on it [2], [3]. Recently, Inoue suggested a new type of structure called magneto photonic crystal in which the constitutive elements are magnetic materials (or even only a defect introduced into the periodic structure is magnetic) [4].…”

Mode conversion in a magnetic photonic crystal waveguide

“…Rare earth elements, such as bismuth and cerium, have been found to enhance the FR, without significantly increasing the absorption [5,6]. Most proposals of waveguide-type isolators are based on a nonreciprocal TE-TM mode conversion [7,8]: Ando et al proposed an optical isolator version which is based on the Faraday effect for a nonreciprocal TE-TM mode conversion and the Cotton-Mouton effect for a reciprocal conversion [9]. K Xie showed the isolation effect in the guide with 50% TE-TM mode conversion [10].…”