When I calculate the second-order nonlinear optical susceptibilities by using Method from S. Sharma(DOI: 10.1103/PhysRevB.67.165332), I get d33's shape like the image attached which the absolute value of d33 decrease with increased incident light energy under the resonant frequency. In my experience, I always get second-order susceptibilities shape like images of d11.png and d15.png attached.
My questions are:
1. Is the d33 behavior an abnormal one or normal one or wrong?
2. What is the physical meaning of negative second-order optical susceptibilities? Could you give me a clear and easy physical model of explanation?
Thanks.
Jason Yu from Chinese Academic of Science.
Why don't you email Prof. Draxl with the question or at least ask her how to contact Sharma. Google Ambrosch-Draxl and you will find links to her research group.
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