![]() An interesting phenomena that occurs for this coupled waveguide system is that the force can be tuned to be either attractive or repulsive depending on the relative phase of the two modes. This is different from radiation pressure which involves momentum exchange between photons and is longitudinal in nature (i.e., along the $z$ direction). As the two waveguides are brought closer and closer together, their modes couple and give rise to a gradient force that is transverse to the waveguide axis (i.e., in the $x$ direction). ![]() Due to the parallel orientation of the waveguides (propagation axis along $z$ and separation in $x$), the two modes can be chosen to be either symmetric or anti-symmetric with respect to an $x$ mirror-symmetry plane between them. ![]() A schematic of the geometry is shown below. The geometry consists of two identical, parallel, silicon waveguides with square cross section in vacuum. This tutorial demonstrates Meep's ability to compute classical forces via the Maxwell stress tensor.
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