Abstract
In this paper, we have proposed an ultra compact, wide band, and high
speed current-controlled magneto-optic (MO) switch based on the optical excitation
of surface plasmon polaritons (SPPs) in a magneto-optic metal-insulator-metal
(MO-MIM) waveguide. The SPPs are excited on thin metal films in a Kretschmann
configuration. For description of device operation, we have derived the dispersion
relation with considering MO effects for the mid layer in the five layer surface
plasmon polariton (SPP) slab waveguides in a longitudinal configuration which
the applied magnetic field is parallel to the layers' interfaces and the longitudinal
wave propagation direction. Due to the coupling between SPP modes, there exist
all components of the electromagnetic field, hence we do not have purely TM
modes in this configuration. For evaluation of the excitation condition, we
have used the Rourad's method to calculate the total reflection coefficient
due to all layers beyond the interface of the prism and gold where the incident
light is launched to the device. The optical response and operation of the
device are discussed in terms of dimensions and wavelength. The device operation
is based on the variations of the magnetic bias condition by altering the
magnetization within the YIG layer. Switching between ON and OFF states is
achieved by altering the amplitude of the control current from zero to an
appropriate value which the amplitude of the magnetic field bias, changes
proportional to the current value. The presented algorithm for analysis of
the proposed switch is useful for the design and analysis of any magneto-optic
surface plasmon device.
© 2013 IEEE
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