Resonant and Non Resonant Susceptibility

In summary, resonance in susceptibility refers to the enhanced response of a material to an external electromagnetic field when the frequency of the field matches the material's natural frequency. Non-resonant susceptibility, on the other hand, occurs when the frequency of the field does not match the material's natural frequency, resulting in a weaker response. Factors such as composition, structure, and temperature can affect the susceptibility of a material. Techniques such as spectroscopy and polarimetry are used to measure resonant and non-resonant susceptibility. Real-world applications include material science, optics, electronics, medical imaging, and energy harvesting.
  • #1
n0_3sc
243
1
The imaginary part of the [tex]\chi ^3[/tex] susceptibility can be split into the resonant and non resonant contributions.
The resonant is the contribution from satisfying a resonant vibrational state/mode, but what contributes to the non resonant term?
 
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  • #2
n0_3sc said:
The imaginary part of the [tex]\chi ^3[/tex] susceptibility can be split into the resonant and non resonant contributions.
The resonant is the contribution from satisfying a resonant vibrational state/mode, but what contributes to the non resonant term?

everything else, apparently. :wink:
 
  • #3


The non-resonant term in the \chi^3 susceptibility arises from the interaction of the electromagnetic field with the electronic and nuclear degrees of freedom of the material. This can include effects such as electronic transitions, molecular vibrations, and rotational motions. These interactions can lead to changes in the polarization of the material, resulting in a non-resonant contribution to the susceptibility. Additionally, thermal effects and disorder in the material can also contribute to the non-resonant term. The non-resonant term is important in understanding the overall response of a material to an external electromagnetic field, and its contribution should not be overlooked in theoretical or experimental studies.
 

FAQ: Resonant and Non Resonant Susceptibility

1. What is resonance in terms of susceptibility?

Resonance in susceptibility refers to the phenomenon where a material's response to an external electromagnetic field is enhanced when the frequency of the field matches the material's natural frequency. This results in a sharp increase in the material's susceptibility and can lead to various interesting effects such as absorption, emission, and amplification of the field.

2. How does non-resonant susceptibility differ from resonant susceptibility?

Non-resonant susceptibility refers to the material's response to an external electromagnetic field when the frequency of the field does not match the material's natural frequency. In this case, the material's susceptibility is not enhanced and its response is typically weaker compared to resonance. Non-resonant susceptibility can still lead to interesting effects, such as scattering and polarization, but they are not as strong as those seen in resonance.

3. What factors affect the resonant and non-resonant susceptibility of a material?

The resonant and non-resonant susceptibility of a material can be affected by various factors such as the material's composition, structure, and temperature. In general, materials with higher natural frequencies and stronger interactions between their atoms and the external field will exhibit higher susceptibility. Additionally, the presence of impurities or defects in the material can also affect its susceptibility.

4. How is the resonant and non-resonant susceptibility measured?

The resonant and non-resonant susceptibility of a material can be measured using various techniques such as spectroscopy, ellipsometry, and polarimetry. These techniques involve exposing the material to an external electromagnetic field and measuring its response, which can then be used to calculate the material's susceptibility. The choice of technique depends on the specific properties of the material and the required accuracy of the measurement.

5. What are some real-world applications of resonant and non-resonant susceptibility?

The study of resonant and non-resonant susceptibility has various applications in fields such as material science, optics, and electronics. In material science, it is used to characterize the properties of different materials and understand their behavior under external fields. In optics, it is used in the design of devices such as lasers and optical filters. In electronics, it is used in the development of components such as antennas and resonators. Additionally, it also has applications in medical imaging, energy harvesting, and many other areas.

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