EMofas

EMofas, short for Electromagnetic Optical Field Analysis System, is a modular measurement platform designed to jointly characterize electromagnetic and optical fields in materials and devices. By integrating electromagnetic excitation with optical readouts, EMofas enables simultaneous mapping of field distributions and optical responses with high spatial and spectral resolution.

The concept emerged from cross-disciplinary work in physics, optics, and electrical engineering during the 2010s. Early prototypes demonstrated coordinated EM and optical measurements on nanostructures, leading to a family of instruments used in academic and industrial labs. The term EMofas is used to describe both specific instrument configurations and the broader class of systems that blend electromagnetic field analysis with optical spectroscopy.

A typical EMofas comprises three core subsystems: a broadband electromagnetic field source or waveform generator; a sensing head that can include near-field probes or antenna arrays; and an optical interrogation module featuring spectrometers, interferometers, or microscopy optics. A data-acquisition and processing unit performs co-registration of EM and optical data, calibration, and multi-physics analysis. The platform often supports multiple measurement modes, including EM-field mapping, optical spectroscopy, and combined field–response imaging.

It is used to study metamaterials, photonic devices, nanoelectronic components, and biological tissues where electromagnetic and optical properties interact. Output metrics may include complex permittivity and permeability, refractive index, loss tangents, and local field enhancement factors.

Limitations and outlook: EMofas systems can be complex and costly, requiring careful calibration and specialized expertise. There is no universal standard for cross-domain data formats yet, which can hinder comparison across setups. Ongoing work focuses on improving calibration procedures, open data standards, and integrated software for multi-physics interpretation.