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Coordinate System selection for 128 YX LiNbO3 - surface acoustic wave

Rahul Kishor Semiconductors

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Dear Experts,

I am trying to simulate a surface acoustic wave device using 128YX lithium niobate. I have generated the rotated matrix for the Euler angle (0,38,0) - attached file has the properties.

Now, I have a doubt in selecting the coordinate system for the piezoelectric material- is it the Material XZ plane system that needs to be selected? (Assuming that the COMSOL coordinate maps to the local coordinates of the rotated piezoelectric material, where the wave propagates in the X direction and the axis normal to the cut being the Z axis) Is my understanding correct?

Please correct me if I am wrong? My simulation output doesn't seem to be correct, so I am confused if its the orientation that is wrong, or is it the boundary /loads that's causing the issue.

Thanks & Regards,
Rahul Kishor


1 Reply Last Post 30 set 2015, 04:57 GMT-4
COMSOL Moderator

Hello Rahul Kishor

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Posted: 9 years ago 30 set 2015, 04:57 GMT-4
have you solved this problem? I m confused by the same question.
my rotate matrix almost the same to you.
can you share your model?

EPS =
43.6 0 0
0 38.127 -7.0055
0 -7.0055 34.633
EK =
0 0 0 0 4.4724 0.27875
-1.8804 4.4466 -1.5221 0.067383 0 0
1.7149 -2.692 2.3135 0.63381 0 0
CE =
2.03e+11 7.0072e+10 5.7928e+10 1.2851e+10 0 0
7.0072e+10 1.9442e+11 9.0764e+10 9.6691e+09 0 0
5.7928e+10 9.0764e+10 2.2205e+11 8.5299e+09 0 0
1.2851e+10 9.6691e+09 8.5299e+09 7.5764e+10 0 0
0 0 0 0 5.6953e+10 -5.0999e+09
0 0 0 0 -5.0999e+09 7.8047e+10
have you solved this problem? I m confused by the same question. my rotate matrix almost the same to you. can you share your model? EPS = 43.6 0 0 0 38.127 -7.0055 0 -7.0055 34.633 EK = 0 0 0 0 4.4724 0.27875 -1.8804 4.4466 -1.5221 0.067383 0 0 1.7149 -2.692 2.3135 0.63381 0 0 CE = 2.03e+11 7.0072e+10 5.7928e+10 1.2851e+10 0 0 7.0072e+10 1.9442e+11 9.0764e+10 9.6691e+09 0 0 5.7928e+10 9.0764e+10 2.2205e+11 8.5299e+09 0 0 1.2851e+10 9.6691e+09 8.5299e+09 7.5764e+10 0 0 0 0 0 0 5.6953e+10 -5.0999e+09 0 0 0 0 -5.0999e+09 7.8047e+10

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