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Advanced characterization of electrowetting retroreflectors.

Murali K Kilaru¹, Jia Yang, Jason Heikenfeld

¹Novel Devices Laboratory, Dept. of Elec. & Comp. Engineering, University of Cincinnati, Cincinnati, Ohio 45220, USA.

|November 13, 2009

Summary

Electrowetting retroreflectors offer tunable reflection using liquid lenslets. These devices achieve high contrast ratios and broad spectrum utility for applications like road signage and safety markings.

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Area of Science:

Optics and Photonics
Materials Science

Background:

Electrowetting retroreflectors utilize electrically tunable liquid lenslets for controllable light reflection.
Existing designs offer a foundation for advanced optical functionalities.

Purpose of the Study:

To explore new capabilities and characterization of electrowetting retroreflectors.
To investigate performance metrics such as contrast ratio and angular intensity distribution.

Main Methods:

Fabrication of electrowetting retroreflectors with higher index liquids.
Electrical modulation of lenslet geometry to switch between retroreflection and scattering.
Characterization of contrast ratio as a function of contact angle (θ(V)).
Spatial profiling of reflected intensity as a function of view angle.

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Main Results:

Demonstrated a high contrast ratio exceeding 16X.
Characterized performance with higher index liquids.
Reported spatial intensity profiles as a function of view angle.

Conclusions:

Electrowetting retroreflectors provide a scalable platform with tunable optical properties.
The broad spectrum (VIS-IR) capability makes them suitable for diverse applications.
Further improvements in performance are achievable through material and design optimization.