Nelly

Nelly extracts complex-valued material properties, such as refractive index and conductivity, from terahertz (THz) time-domain spectroscopy data to determine complex refractive indices of multilayer samples.

Key Features:

• Tree-Based Modeling Approach: Employs a tree-based modeling technique to account for all transmission and reflection paths of THz pulses through layered sample structures.
• Comprehensive Path Analysis: Represents branching transmission and reflection events as a tree to generate precise expressions relating unknown complex refractive indices to observed time-domain signals.

Scientific Applications:

• Materials Science: Characterizing optical properties of novel materials, including semiconductors and polymers, by extracting complex refractive indices at THz frequencies.
• Biology: Analyzing biological tissues and biomolecules to assess structural and functional characteristics at THz frequencies.

Methodology:

Programmatically models all potential transmission and reflection paths through multilayer samples using a tree-based framework that generates expressions relating unknown complex refractive indices to THz time-domain measurements, eliminating approximations that would restrict applicability.