M. Diware, G. Min
Park Systems Inc,
United States
Keywords: Imaging spectroscopic ellipsometry, 2D materials, optical properties
Summary:
Imaging spectroscopic ellipsometry (ISE) is a powerful optical technique used to study the optical properties of nanomaterials and two-dimensional (2D) materials, which have attracted significant attention due to their unique electronic and mechanical properties. These materials, often used in electronics, photonics, and sensing applications, require precise characterization methods like ISE for their development and optimization. In this research, we utilize ISE to investigate the optical characteristics of various nanomaterials, such as graphene and transition metal dichalcogenides (TMDs), along with other emerging 2D materials. ISE provides comprehensive data on the complex refractive index, material thickness, and anisotropic optical behavior over a broad spectral range. By measuring changes in polarization as light interacts with the surface of these materials, ISE offers valuable insights into electronic transitions, band structure, and excitonic effects at the nanoscale. ISE’s spatial resolution is particularly advantageous for studying micron-sized samples, enabling the identification of inhomogeneities and defects that can significantly impact optical performance. This combination of high spatial resolution and spectroscopic detail allows for the mapping of optical constants and detection of localized property variations. Our results demonstrate that ISE is an essential tool for characterizing the optical properties of nanomaterials and 2D materials, providing insights crucial for device design and optimization. The ability to accurately map optical properties at the micron scale facilitates new research directions and technological advancements in nanotechnology. This includes potential improvements in optoelectronic devices, flexible electronics, and novel sensing platforms. The study underscores the importance of ISE in enhancing our understanding of these advanced materials and their applications, paving the way for innovations in various high-tech fields.