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Guidelines for 1D-periodic surface microstructures for antireflective lenses.

Thomas Søndergaard¹, Jesper Gadegaard, Peter Kjær Kristensen

¹Department of Physics and Nanotechnology, Aalborg University, Skjernvej 4A, DK-9220 Aalborg Øst, Denmark. ts@nano.aau.dk

|December 18, 2010

Summary

Microstructured lens surfaces offer antireflective properties. For optimal light transmission, especially with visible light, structure periods should be below 300 nm to avoid unwanted diffraction orders.

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Area of Science:

Optics and Photonics
Materials Science

Background:

Microstructured surfaces are explored for antireflection coatings.
Controlling light diffraction orders is crucial for efficient optical components.

Purpose of the Study:

Investigate antireflective properties of 1D microstructured lens surfaces.
Establish design guidelines for maximizing fundamental transmission order.

Main Methods:

Green's function surface integral equation method.
Analysis of near-field interactions and waveguiding effects.
Evaluation of tapered and ridge structures.

Main Results:

Reflection can be minimized, but higher diffraction orders reduce fundamental transmission.
Optimum fill factor decreases with structure period due to waveguiding.
Tapered structures show adiabatic field transformation.

Conclusions:

Surface structure period is critical for antireflection efficiency.
For visible light and normal incidence, period < 300 nm is recommended.
Oblique incidence requires even smaller structure periods.