# Optical neutrality: invisibility without cloaking.

@article{Hodges2017OpticalNI, title={Optical neutrality: invisibility without cloaking.}, author={Reed Hodges and Cleon Eugene Dean and Maxim Durach}, journal={Optics letters}, year={2017}, volume={42 4}, pages={ 691-694 } }

We show that it is possible to design an invisible wavelength-sized metal-dielectric metamaterial object without evoking cloaking. Our approach is an extension of the neutral inclusion concept by Zhou and Hu [Phys. Rev. E74, 026607 (2006)PLEEE81063-651X10.1103/PhysRevE.74.026607] to Mie scatterers. We demonstrate that an increase of metal fraction in the metamaterial leads to a transition from dielectric-like to metal-like scattering, which proceeds through invisibility or optical neutrality of…

## 4 Citations

### Analytical, numerical, and experimental investigation of a Luneburg lens system for directional cloaking

- PhysicsPhysical Review A
- 2019

In this study, the design of a directional cloaking based on the Luneburg lens system is proposed and its operating principle is experimentally verified. The cloaking concept is analytically…

### Directional invisibility by genetic optimization.

- PhysicsOptics letters
- 2018

A three-dimensional finite-difference time-domain method is combined with the genetic optimization approach to generate the cloaking structure to directionally cloak a cylindrical object made of a perfect electrical conductor by suppressing the undesired scattered fields around the object.

### ON FRESNEL-AIRY EQUATIONS, FABRY-PEROT RESONANCES AND SURFACE ELECTROMAGNETIC WAVES IN ARBITRARY BIANISOTROPIC METAMATERIALS

- PhysicsProgress In Electromagnetics Research
- 2022

We introduce a theory of optical responses of bianisotropic layers with arbitrary effective medium parameters, which results in generalized Fresnel-Airy equations for reflection and transmission…

### Computational Approaches to Scattering by Microspheres

- Computer Science
- 2017

The theoretical background specific to the microspheres in the system and the procedure of translating functions to Fortran are described and the process of optimizing the code and parallelizing various functions, comparing efficiencies and runtimes are outlined.

## References

SHOWING 1-10 OF 35 REFERENCES

### Invisibility and Cloaking: Origins, Present, and Future Perspectives

- Physics
- 2015

The development of metamaterials, i.e., artificially structured materials that interact with waves in unconventional ways, has revolutionized our ability to manipulate the propagation of…

### Optical Conformal Mapping

- PhysicsScience
- 2006

A general recipe for the design of media that create perfect invisibility within the accuracy of geometrical optics is developed, which can be applied to escape detection by other electromagnetic waves or sound.

### REVIEW ARTICLE: Plasmonic and metamaterial cloaking: physical mechanisms and potentials

- Chemistry
- 2008

Some of the different cloaking mechanisms recently proposed in the literature, such as plasmonic cloaking based on scattering cancelation, coordinate-transformation cloaking and anomalous localized resonances for cloaking are overviewed, with particular attention to the physical phenomena involved.

### Plasmon-assisted transparency in metal-dielectric microspheres.

- PhysicsOptics letters
- 2007

A theoretical analysis of light scattering from a layered metal-dielectric microsphere consisting of two spherical resonators coupled through concentric embedding finds that near an avoided crossing the scattering cross section is dramatically suppressed, exhibiting a tunable optical transparency.

### Invisible metallic mesh

- PhysicsProceedings of the National Academy of Sciences
- 2016

An invisible material––a solid composite possessing identical electromagnetic properties as air so that its arbitrarily shaped object neither reflects nor refracts light at any angle of incidence in free space is introduced.

### Anomalous absorption, plasmonic resonances, and invisibility of radially anisotropic spheres

- Physics
- 2015

This article analyzes the response of a sphere with radially anisotropic permittivity dyadic (RA sphere), in both the electrostatic and full electrodynamic settings. Depending on the values and signs…

### Photonic nanojets

- PhysicsIEEE Antennas and Propagation Society Symposium, 2004.
- 2004

Using high-resolution finite-difference time-domain (FDTD) numerical modeling, it is found that photonic nanojets have waists smaller than the diffraction limit and propagate over several optical wavelengths without significant diffraction.

### Transparent uniaxial anisotropic spherical particles designed using radial anisotropy.

- PhysicsPhysical review. E, Statistical, nonlinear, and soft matter physics
- 2011

Analysis of fields in both the far- and near-field zones indicates that the derived relation is not only valid for electrically small particles, but also applicable to larger ones whose sizes are comparable with the free space wavelength after slight adjustments in parameters.

### Photonic nanojet enhancement of backscattering of light by nanoparticles: a potential novel visible-light ultramicroscopy technique.

- PhysicsOptics express
- 2004

Not involving evanescent fields and not requiring mechanical scanning, photonic nanojets may provide a new means to detect and image nanoparticles of size well below the diffraction limit and yield a potential novel ultramicroscopy technique using visible light for detecting proteins, viral particles, and even single molecules.

### Interaction of light with a hyperbolic cavity in the strong-coupling regime with Fano resonance

- Physics2015 Days on Diffraction (DD)
- 2015

Light-matter interaction is studied for an open quantum system in the strong-coupling regime. A quantum dot and a cavity of spherical geometry is shown to couple light with large Rabi frequency and…