A novel special optical waveguide structure with magneto-optic nonreciprocal phase shift under transversely applied magnetic field

2019 ◽  
Author(s):  
Dengwei Zhang ◽  
Cui Liang ◽  
Heming Wei ◽  
Abhishek Kottaram Amrithanath ◽  
Sridhar Krishnaswamy ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Phase Shift ◽  
Optical Waveguide ◽  
Applied Magnetic Field ◽  
Waveguide Structure ◽  
Magneto Optic

A novel special optical fiber with magneto-optic nonreciprocal phase shift under transversely applied magnetic field

Optik ◽  
2019 ◽  
Vol 179 ◽  
pp. 641-645
Author(s):  
Cui Liang ◽  
Dengwei Zhang ◽  
Xiaowu Shu ◽  
Cheng Liu
Keyword(s):  
Magnetic Field ◽  
Phase Shift ◽  
Optical Fiber ◽  
Applied Magnetic Field ◽  
Magneto Optic

Magneto-optics

2004 ◽  
Author(s):  
Robert E. Newnham
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Faraday Effect ◽  
Magnetic Circular Dichroism ◽  
Polarized Light ◽  
Practical Interest ◽  
Electronic Energy ◽  
Kerr Rotation ◽  
Linearly Polarized ◽  
Magneto Optic

The magneto-optic properties of interest are the Faraday Effect, Kerr Rotation, and the Cotton–Mouton Effect. In 1846, Michael Faraday discovered that when linearly polarized light passes through glass in the presence of a magnetic field, the plane of polarization is rotated. The Faraday Effect is now used in a variety of microwave and optical devices. Normally the Faraday experiment is carried out in transmission, but rotation also occurs in reflection, the so-called Kerr Rotation that is used in magneto-optic disks with Mbit storage capability. Other magneto-optic phenomena of less practical interest include the Cotton– Mouton Effect, a quadratic relationship between birefringence and magnetic field, and magnetic circular dichroism that is closely related to the Faraday Effect. A number of nonlinear optical effects of magnetic or magnetoelectric origin are also under study. Almost all these magnetooptical effects are caused by the splitting of electronic energy levels by a magnetic field. This splitting was first discovered by the Dutch physicist Zeeman in 1896, and is referred to as the Zeeman Effect. When linearly polarized light travels parallel to a magnetic field, the plane of polarization is rotated through an angle ψ. It is found that the angle of rotation is given by . . . ψ(ω) = V(ω)Ht, . . . where H is the applied magnetic field, t is the sample thickness, ω is the angular frequency of the electromagnetic wave, and V(ω) is the Verdet coefficient. Faraday rotation is observed in nonmagnetic materials as well as in ferromagnets. The Verdet coefficient of a commercial one-way glass is plotted as a function of wavelength in Fig. 31.1(a). Corning 8363 is a rare earth borate glass developed to remove reflections from optical systems. A polarized laser beam is transmitted through the glass parallel to the applied magnetic field. The plane of polarization is rotated 45◦ by the Faraday Effect. The transmitted beam passes through the analyzer that is set at 45◦ to the polarizer. But the reflected waves coming from the surface of the glass and from the analyzer are rotated another 45◦ as they return toward the laser.

Design of Optical Isolator with TiO2/(CeY)3Fe5O12 Guiding Layer

2011 ◽  
Vol 1291 ◽  
Author(s):  
Hideki Yokoi ◽  
Shintaro Ikeya ◽  
Tsuyoshi Imada
Keyword(s):  
Magnetic Field ◽  
Phase Shift ◽  
Multimode Interference ◽  
Optical Isolator ◽  
Layer Structures ◽  
Optic Waveguide ◽  
Multimode Interference Coupler ◽  
Magneto Optic

ABSTRACTAn optical isolator with a TiO2/(CeY)3Fe5O12 guiding layer was studied. A nonreciprocal phase shift was calculated in the magneto-optic waveguide with the TiO2/(CeY)3Fe5O12 guiding layer at a wavelength of 1.55 μm. By employing a multimode interference coupler as coupling devices, the total device length of approximately 600 μm was achieved. An interferometric optical isolator with distinct layer structures, which could be operated in a unidirectional magnetic field, was also designed.

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