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Probing Inherent Optical Anisotropy in Substrates via Direct Nanoimaging of Mie Scattering
Hwi Je Woo1, Jaewon Han1, Sangmin Ji1
1SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea.
ACS Nano
|April 30, 2024
Summary
This study reveals anisotropic optical properties in rhenium disulfide (ReS2) substrates using Mie-scattering-induced surface analysis (MISA). The findings highlight ReS2
Area of Science:
- Nanophotonics and Materials Science
- Investigating the optical properties of transition metal dichalcogenides (TMDs) at the nanoscale.
Background:
- Transition metal dichalcogenides (TMDs) are crucial materials with unique optical properties.
- Understanding nanoscale light-matter interactions is essential for advanced optical applications.
Purpose of the Study:
- To investigate and visualize nanoscale Mie scattering on TMD substrates.
- To differentiate the optical behavior of molybdenum disulfide (MoS2) and rhenium disulfide (ReS2) substrates.
- To explore the anisotropic optical responses of ReS2.
Main Methods:
- Utilizing Mie-scattering-induced surface analysis (MISA).
- Employing near-field optical microscopy for direct visualization.
- Conducting finite-difference time-domain (FDTD) simulations for systematic analysis.
Main Results:
- Superspherical gold nanoparticles (s-AuNPs) Mie scattering was visualized at the nanoscale.
- Molybdenum disulfide (MoS2) substrates demonstrated optical isotropy.
- Rhenium disulfide (ReS2) substrates exhibited significant optical anisotropy, especially in the near-infrared range.
- Anisotropic trends in spectral and angular responses of satellite peaks were observed for ReS2.
Conclusions:
- Mie scattering is a valuable technique for probing substrate optical properties.
- ReS2 displays distinct anisotropic optical behavior due to light-electric field interactions.
- The study enhances understanding of nanoscale light-matter interactions in anisotropic TMDs.
