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This chapter deals with the quantization of the electromagnetic field and introduces the concept of photon as a quantum of excitation of the electromagnetic field by showing that each mode of the electromagnetic field behaves like a linear harmonic oscillator. Annihilation and creation operators of individual modes of the electromagnetic field are introduced and an expression for the electric field operator is obtained.

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Quantization of the Electromagnetic Field and the Concept of Photon

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  • 发表日期：

    2025年

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  • Krishna Thyagarajan

摘要

This chapter deals with the quantization of the electromagnetic field and introduces the concept of photon as a quantum of excitation of the electromagnetic field by showing that each mode of the electromagnetic field behaves like a linear harmonic oscillator. Annihilation and creation operators of individual modes of the electromagnetic field are introduced and an expression for the electric field operator is obtained.