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Related Experiment Video

Updated: Apr 28, 2026

Digital Inline Holographic Microscopy DIHM of Weakly-scattering Subjects

Digital Inline Holographic Microscopy DIHM of Weakly-scattering Subjects

Published on: February 8, 2014

Metamaterials. Invisibility cloaking in a diffusive light scattering medium.

Robert Schittny¹, Muamer Kadic², Tiemo Bückmann¹

¹Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), D-76128 Karlsruhe, Germany. Deutsche Forschungsgemeinschaft (DFG)-Center for Functional Nanostructures (CFN), KIT, D-76128 Karlsruhe, Germany.

Science (New York, N.Y.)

|June 7, 2014

Summary

This study demonstrates practical invisibility cloaks that work in diffusive environments, overcoming previous physical limitations. These cloaks effectively hide objects by manipulating light scattering, not just refraction.

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Area of Science:

Optics
Materials Science
Physics

Background:

Traditional invisibility cloaks based on Maxwell's equations face physical limitations for macroscopic, broadband, and omnidirectional applications.
The study explores alternative physical principles beyond ballistic light propagation.

Purpose of the Study:

To investigate the feasibility of invisibility cloaks in environments characterized by multiple light scattering.
To design and fabricate broadband, passive, and omnidirectional invisibility cloaks.

Main Methods:

Theoretical exploration based on Fick's diffusion equation for light scattering environments.
Fabrication of cylindrical and spherical cloaks using polydimethylsiloxane shells doped with melamine-resin microparticles.
Experimental testing of cloaking performance in a water-based diffusive medium.

Main Results:

Demonstrated successful cloaking in a diffusive surrounding, contradicting limitations in ballistic media.
Achieved good cloaking performance across the entire visible spectrum.
Confirmed effectiveness for all illumination conditions and incident polarizations.

Conclusions:

Invisibility cloaking is achievable in multiple light scattering environments, expanding the possibilities beyond traditional optics.
The developed microparticle-doped polymer shells offer a viable method for creating practical diffusive invisibility cloaks.
This research opens new avenues for cloaking technologies in scattering media.