Alterable grating fiber-optic switch

Abstract

This paper describes a solid state high speed fiber-optic switch based on dynamically alterable magnetic stripe domains that occur naturally in epitaxial films of rare-earth iron garnet. The array of stripe domains acts collectively as a Faraday effect phase diffraction grating that deflects visible and infrared radiation. Electrically derived magnetic fields in the plane of the film steer incident light from an input fiber to one of several output fibers. Reciprocity and wavelength sensitivity can be exploited for systems applications. Both theoretical and experimental results are presented.

Pure magneto-optic diffraction by a periodic domain structure

“…To our knowledge this is the first study of controlled diffraction in reflection by a flat 3d metallic thin film. However, in the context of integrated magneto-optic devices and irongarnet wave guides developed in the 1970-1980s, there are some works where garnets are used to produce Faraday and Kerr diffraction by periodic stripe domain patterns [20][21][22][23].…”

Steering light with magnetic textures

“…10,11 Therefore, investigating ways in which tailored magnetic textures can be harnessed for the design of useful optical responses is of particular interest. [11][12][13][14][15] In fact, related approaches for magnetic holography recording and the subsequent steering of light were initiated in the 1970s using garnet materials, [16][17][18][19][20][21][22][23] MnBi alloys, [24][25][26] and EuO. 27 In light of the metamaterial approach and opportunities, we here revisit the use of yttrium-iron garnet (YIG) 16,18,22 for obtaining one of the most basic functions of an optical component: deflection of light.…”

A new and efficient synthesis of unsaturated benzoxazepines using sodium metabisulfite and potassium permanganate as oxidative reagents

“…19 Levan et al reported the isolation and characterization of the unsubstituted 1,2,3,4,5,6,11-hexahydro imidazo- [1,2-d]benzoxazepine as a by-product in a tedious route and without mentioning the product yield. 20,21…”