Rigorous prediction of Raman intensity from multi-layer films

Area of Science:

• Materials Science
• Spectroscopy
• Optics

Background:

• Raman spectroscopy is crucial for analyzing thin film materials.
• Signal intensity in multilayer thin films is affected by layer thickness and optical interference.
• Existing models may not fully capture the complexities of multilayer systems.

Purpose of the Study:

• To develop a rigorous calculation method for Raman signal intensity in multilayer thin films.
• To address the non-monotonic intensity variations caused by optical interference effects.
• To provide a versatile tool applicable to diverse thin film material systems.

Main Methods:

• Utilizing the transfer matrix method for optical calculations.
• Incorporating a rigorous treatment of Raman signal generation and discontinuity.
• Applying the methodology to silicon-on-sapphire, graphene/SiO2, and multilayer MoS2 systems.

Main Results:

• A validated method for calculating Raman signal intensity in arbitrary multilayer thin film stacks.
• Demonstrated applicability to various material systems, including those with gaps.
• Accurate prediction of thickness-dependent Raman signal variations.

Conclusions:

• The presented method offers a robust framework for interpreting Raman spectra of multilayer thin films.
• This approach enables more precise characterization of thin film material properties.
• The methodology has broad applications in materials science and device characterization.