Spectroscopic Ellipsometry -

Used to characterize 2D materials like graphene, where layers are only a few atoms thick.

Usually a broadband "white light" source covering ultraviolet to near-infrared wavelengths.

A second rotating polarizer (and sometimes a compensator) that detects the change in the light's state. Spectroscopic Ellipsometry

As materials continue to shrink in size while growing in complexity, spectroscopic ellipsometry remains a cornerstone technology, providing the precision needed to engineer the next generation of electronics and advanced materials.

The name "ellipsometry" comes from the fact that linearly polarized light often becomes after reflecting off a surface. Unlike standard reflectometry, which measures the total intensity of reflected light, SE measures two specific parameters: Used to characterize 2D materials like graphene, where

Vital for optimizing the optical coatings and active layers in photovoltaic cells. Summary of Benefits Non-Destructive: Samples remain intact after measurement.

SE is an technique; it does not measure thickness directly. Instead, researchers use the measured Δcap delta As materials continue to shrink in size while

Can detect films thinner than a single nanometer.