What is it about?

Reciprocity is a fundamental principle that follows the time reversal symmetry of physics. However, many practical applications require breaking time reversal symmetry, hence, are called nonreciprocal. This article aims at discussing time reversal symmetry, developing fundamental building block to achieve nonreciprocity leading to robust analytical model to explain electromagnetic rotation upon propagation through a nonreciprocal medium. Detailed mathematical derivation is presented for Faraday and Kerr rotation in the presence of external bias which breaks time reversal symmetry and leads to achieve nonreciprocal system. We validate our proposed model for conventional conditions and we compute the Faraday and Kerr rotation from a reported article using our proposed mathematical model and observed excellent agreement.

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Why is it important?

Measuring nonreciprocal polarization rotation is very difficult and in this work we developed a mathematical modelling which is very simple to implement in the lab to measure polarization rotation accurately from S parameters.


In a series of publication we developed the mathematical modelling, artificial nonreciprocity, tunability feature in nonreciprocal medium. Our proposed methods were validated by state of the art electromagnetic simulation followed by measurement in the lab which agreed pretty well.

Swadesh Poddar
Qorvo Inc, US

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This page is a summary of: Analytical modeling of electromagnetic rotation in nonreciprocal media, Journal of Applied Physics, November 2022, American Institute of Physics, DOI: 10.1063/5.0106896.
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