en عمومى General پژوهشي Research In this paper we consider electromagnetic field quantization in the presence of a dispersive and absorbing semiconductor quantum dot. By using macroscopic approach and Green's function method, quantization of electromagnetic field is investigated. Interaction of a two-level atom , which is doped in a semiconductor quantum dot, with the quantized field is considered and its spontaneous emission rate is calculated. Comparing with the same condition for an excited atom inside the bulk, it is shown that the spontaneous emission rate of an atom will decrease. Semiconductor Quantum Dot, Quantization, Spontaneous Emission 19 26 http://ijop.ir/browse.php?a_code=A-10-150-2&slc_lang=en&sid=1 E. Karimzadeh Esfahani 10031947532846001156 10031947532846001156 Yes Quantum Optics Group, Department of Physics, University of Isfahan M. Bagheri Harouni 10031947532846001157 10031947532846001157 No Quantum Optics Group, Department of Physics, University of Isfahan R. Roknizadeh 10031947532846001158 10031947532846001158 No Quantum Optics Group, Department of Physics, University of Isfahan