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Transformation

Transformation

Microbial communities are dynamic environments where cell lysis releases free DNA into the surroundings. Other cells can take up this extracellular DNA through a process known as transformation.When a cell incorporates this foreign DNA into its genome, resulting in genetic modification, the process is known as transformation. Cells capable of this process are termed competent. Competence can be natural, as observed in certain bacteria and archaea, or artificially induced in the...

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Updated: Jun 3, 2026

Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging

Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging

Published on: March 31, 2022

Cloaking a sensor via transformation optics.

Allan Greenleaf¹, Yaroslav Kurylev, Matti Lassas

¹Department of Mathematics, University of Rochester, Rochester, New York 14627, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|March 17, 2011

Summary

This summary is machine-generated.

Approximate transformation optics cloaking allows strong coupling between cloaked and uncloaked regions, degrading shielding. This enables novel sensor applications where devices inside the cloak can detect external waves.

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Area of Science:

Metamaterials
Electromagnetism
Optics

Background:

Transformation optics (TO) cloaking aims to render objects invisible by guiding electromagnetic waves around them.
Ideal TO cloaking provides both invisibility and shielding, preventing interaction with the cloaked region.

Purpose of the Study:

To investigate the behavior of approximate TO cloaking, focusing on the coupling between cloaked and uncloaked regions.
To explore the potential of approximate cloaking for novel sensor applications.

Main Methods:

Analysis of wave coupling in approximate transformation optics cloaks.
Identification of specific parameter regimes that amplify coupling.
Development of sensor modes distinct from interior resonances.

Main Results:

Approximate cloaking permits significant coupling between the cloaked and external regions.
Amplified coupling can lead to cloaks with reduced shielding capabilities.
Novel sensor modes are identified that are close to, but distinct from, cloaking-destroying interior resonances.

Conclusions:

Approximate TO cloaking offers a trade-off between invisibility and shielding, enabling new functionalities.
This approach facilitates the development of cloaked sensors capable of measuring external incident waves.