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In this paper, we adopt the method of quantum fields in curved spacetime toquantize a free scalar matter field in the braneworld background whose warpedfactor is of the form that could generate P\"{o}schl-Teller potential. Then weconsider the interaction between the scalar field $\phi(x)$ and a classicalscalar source $\rho(x)$ with the form$\mathcal{H}_I=\sqrt{-g}\tilde{g}\rho(x)\phi(x)$. The corresponding S-matrix isgiven and the number of particles generated by the source is obtained.Furthermore, we get the {particle numbers} in the cases that only ground statemode of the field could be detected and both the ground and first exited statescould be detected, respectively. Finally, by the particle number density wedefine, we show how the extra dimension makes a difference specifically by theexcited modes.

Quantized Scalar Fields in Curved Spacetime Background of Thick Brane