Mapping complex profiles of light intensity with interferometric lithography.

Area of Science:

• Physics
• Nanotechnology
• Optics

Background:

• Accurate mapping of electromagnetic fields near nanostructured metal surfaces is crucial for nanophotonic applications like sensing and photovoltaics.
• Studying non-periodic, extended patterns presents numerical challenges in solving Maxwell's equations.

Purpose of the Study:

• To faithfully map complex light intensity patterns from closely-spaced multiple apertures in a metal film.
• To achieve sub-wavelength resolution in mapping field distributions from near-field to far-field.
• To investigate the role of metal film permittivity in shaping isointensity surfaces.

Main Methods:

• Numerical simulations solving Maxwell's equations.
• Experimental validation of simulated field distributions.
• Generation of 3D solid replicas of isointensity surfaces.

Main Results:

• Complex light intensity patterns were accurately mapped with sub-wavelength resolution.
• The mapping extended from near-field to far-field observations.
• Metal film permittivity was shown to significantly influence the shaping of isointensity surfaces.

Conclusions:

• The developed method allows for faithful mapping of electromagnetic fields near nanostructured metal surfaces.
• The study confirms the significant impact of metal permittivity on field distribution.
• This technique provides accurate 3D spatial field distribution data essential for nanophotonic device design and analysis.