# Photothermal interactions in micropolar generalized thermoelastic medium subjected to electromagnetic field

## TL;DR

This paper studies how thermal and electromagnetic effects influence elastic and micropolar properties in a silicon-based material.

## Contribution

The study introduces a novel analytical model combining micropolar thermoelasticity with electromagnetic fields using Green-Naghdi theory.

## Key findings

- Analytical expressions for displacement, stress, and temperature are derived using normal mode analysis.
- External parameters like magnetic field and laser pulse time significantly affect physical quantities in the medium.
- Graphical comparisons confirm the model's accuracy and highlight the impact of external parameters on photothermal phenomena.

## Abstract

The article deals with the response of an infinite micropolar generalized thermoelastic half-space in context of Green-Naghdi theory (type III) which is subjected to electro-magnetic field. The model is used to study the coupling between elastic waves and plasma waves generated due to thermal changes in a micropolar elastic medium. The analytical expressions of displacement components, stresses components, carrier density, microrotation, couple stress and temperature are obtained by normal mode analysis technique. Effects of time, angular frequency, magnetic field, wave number, laser pulse time, and electric permittivity are highlighted on various physical fields such as displacement components, stress components, microrotation, couple stress, temperature distribution, and carrier density. The values of physical fields are computed numerically using Mathematica software considering material constants for silicon. The above physical quantities also conform to the boundary conditions. The work includes detailed graphical representations of crucial discoveries such as displacement components, temperature distributions, stress components, couple stress, microrotation and carrier density which provide amazing visual insights into the complex interactions that occur within thermo-elastic systems. The comparison of our results for the accuracy of physical quantities with previous research work is carried out graphically that indicates to the strong impact of the external parameters in photothermal phenomenon. The study is valuable for the analysis of themoelastic problems involving electro-magnetic field, micropolarity and elastic deformation.

The online version contains supplementary material available at 10.1038/s41598-025-23882-3.