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Improving the acousto-optical interaction in a Mach–Zehnder interferometer
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10.1063/1.3114552
/content/aip/journal/jap/105/8/10.1063/1.3114552
http://aip.metastore.ingenta.com/content/aip/journal/jap/105/8/10.1063/1.3114552

Figures

Image of FIG. 1.
FIG. 1.

Light modulation in a MZI with a SAW generated by an IDT. (a) Three dimensional geometry of a MZI with a propagating SAW ([van der Poel (Ref. 9)]. (b) A 2D cross section through the waveguide arms of the MZI, which is used in the simulations. The SAW is absorbed in PMLs at the boundaries. The dimensions indicated in are in microns given by , , , , , , , , , , , , and .

Image of FIG. 2.
FIG. 2.

Generation of a SAW in a GaAs sample by the piezoelectric model. The position of the IDT is indicated. (a) The color indicates the displacement and the shape of the surface is deformed with the unified displacements and . (b) The graph shows the absolute amplitude along the material surface as function of

Image of FIG. 3.
FIG. 3.

Results for the SAW in the GaAs substrate. (a) Displacements and as function of depth at position . (b) The absolute amplitude normalized with the square root of the electrical power as function of the frequency for 10 and 20 electrode pairs.

Image of FIG. 4.
FIG. 4.

Generation of SAWs in a SOI sample by the piezoelectric model. The results are given to the right of the IDT. (a) The color indicates the displacement and the shape of the surface is deformed with the unified displacements and . (b) The graph shows the absolute amplitude along the material surface as function of .

Image of FIG. 5.
FIG. 5.

The -component of the time averaged power flow of the fundamental mode in the waveguides when no stresses are applied.

Image of FIG. 6.
FIG. 6.

Change in the effective refractive index of the fundamental mode in the two waveguides normalized by the square root of the power as function of the SAW phase . corresponds to a wave crest in the left waveguide and a trough in the right.

Image of FIG. 7.
FIG. 7.

Results for a study of the height of the waveguides with (- - -) indicating the results for the original waveguide geometry. (a) Difference in effective refractive index of the fundamental mode between the two waveguides as function of for 6 and 12 electrode pairs. (b) The effective refractive index for the three lowest order modes in the waveguides normalized to the value of the fundamental mode in the left waveguide for the original geometry as functions of .

Image of FIG. 8.
FIG. 8.

Results for a study of the waveguide width for the optimal height . (a) Difference in effective refractive index of the fundamental mode between the two waveguides as function of . (b) The effective refractive index for the four lowest order modes in the waveguides normalized to the value of the fundamental mode in the left waveguide for the original geometry as functions of .

Tables

Generic image for table
Table I.

The elastic stiffness constants and the density for the materials used in the piezoelectric model.

Generic image for table
Table II.

The piezoelectric stress constants and the permittivity constants for the materials used in the piezoelectric model.

Generic image for table
Table III.

Stress-optical constants (Ref. 19).

Generic image for table
Table IV.

Results for the difference in effective refractive index for different combinations of IDT numbers and single and double electrode fingers, .

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/content/aip/journal/jap/105/8/10.1063/1.3114552
2009-04-22
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Improving the acousto-optical interaction in a Mach–Zehnder interferometer
http://aip.metastore.ingenta.com/content/aip/journal/jap/105/8/10.1063/1.3114552
10.1063/1.3114552
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