Abstract
The nonreciprocal effect is the difference Δβ =
βforward - βbackward between forward
and backward-propagation constants of optical modes. This effect is
analyzed for the fundamental TM00 mode of channel
waveguides in epitaxially grown magnetic garnet films. To increase
|Δβ|, double layers with opposite signs of Faraday rotation are
used to prepare the waveguides. It is shown that the temperature
dependence of Δβ can be reduced considerably if the layer with
positive Faraday rotation, which is at room temperature close to the
Curie point, is replaced by a paramagnetic layer with negligible
Faraday rotation. Concurrently, however, |Δβ| is decreased
by ∼35% at 295 K.
© 1999 Optical Society of America
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