Hi John,
You can look at the cutoff frequency of your 3D waveguide for a single mode
behaviour.
________________________________
From: John Bordelon <[email protected]>
To: [email protected]
Sent: Thursday, December 29, 2011 7:08 PM
Subject: [Meep-discuss] 3d waveguide
Hey all,
I am working on generalising a 2D model into 3D. To start, I am just trying a
single dielectric slab acting as a waveguide. The source is put in the middle
of the slab. However, the guide does not confine the waves.
Any help is greatly appreciated as I have been fumbling around with this for
about a month now.
Here is the code:
(define-param fcen .6452) ; frequency of source
(define-param fspread .01) ; spread in gaussian freq range
(define-param guide_z .2)
(define-param guide_r .2) ;this is the radial thickness of ring
(define-param size_z 1)
(define-param size_x 8)
(define-param size_y 1)
(define-param pml_thickness 2)
(set! geometry-lattice (make lattice (size (+ pml_thickness size_x) (+
pml_thickness size_y) (+ pml_thickness
size_z))))
(set! geometry
(list
(make block (center 0 0 0) (size infinity guide_r guide_z) ; size is
given as (size x y z)
(material (make dielectric (epsilon 11.7))))
))
(set! sources (list
(make source
(src (make gaussian-src (frequency fcen) (fwidth fspread)))
(component
Ez)
(center 0 0 0 ) (size .05 .05 .05) (cutoff 15))))
(set! pml-layers (list (make pml (thickness 1))))
(set! resolution 20)
(use-output-directory)
(run-until 200
(at-beginning output-epsilon)
(to-appended "ez" (at-every 5 output-efield-z)))
------------------------------------------------------------------------------------------------------------------
Also attached is a gif showing what I mean.
Thanks so much,
John Bordelon, Louisiana State University
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