Silicon nanostructure cloak operating at optical frequencies

@article{Gabrielli2009SiliconNC,
  title={Silicon nanostructure cloak operating at optical frequencies},
  author={Lucas H. Gabrielli and Jaime Cardenas and Carl B. Poitras and Michal Lipson},
  journal={Nature Photonics},
  year={2009},
  volume={3},
  pages={461-463}
}
The ability to render objects invisible using a cloak (such that they are not detectable by an external observer) has long been a tantalizing goal1,2,3,4,5,6. Here, we demonstrate a cloak operating in the near infrared at a wavelength of 1,550 nm. The cloak conceals a deformation on a flat reflecting surface, under which an object can be hidden. The device has an area of 225 µm2 and hides a region of 1.6 µm2. It is composed of nanometre-size silicon structures with spatially varying densities… 

Three-Dimensional Invisibility Cloak at Optical Wavelengths

A three-dimensional invisibility-cloaking structure operating at optical wavelengths based on transformation optics is designed and realized and uses a woodpile photonic crystal with a tailored polymer filling fraction to hide a bump in a gold reflector.

Homogeneous optical cloak constructed with uniform layered structures.

A broadband invisibility behavior has been verified at near-infrared frequencies, opening up new opportunities for using uniform layered medium to realize invisibility at any frequency ranges, where high-quality dielectrics are available.

Polarization-independent broadband bidirectional optical cloaking using a new type of inverse scattering approach

Contrary to previous approaches, it is revealed that nearly perfect bidirectional optical cloaking effect can be generated for any type of object with a given shape and size and that neither gain nor lossy materials are required.

A carpet cloak for visible light.

An invisibility carpet cloak device, which is capable of making an object undetectable by visible light, is reported, which can be a general scheme for implementation of transformation optical devices at visible frequencies.

Invisibility Cloak Printed on a Photonic Chip

Direct printed invisibility cloak on a photonic chip may enable controllable study and novel applications in classical and quantum integrated photonics, such as invisualising a coupling or swapping operation with on-chip circuits of their own.

All-dielectric self-cloaked structures

A general procedure to design objects that are intrinsically invisible (without the necessity of an external cloak) has not been demonstrated so far. Here we propose a flexible method to design such

Ray-optics cloaking devices for large objects in incoherent natural light

A simplified version of Pendry's cloak is proposed by abolishing the requirement for phase preservation, as it is irrelevant for observation using incoherent natural light with human eyes, which are phase and polarization insensitive, which allows for a cloak design on large scales using commonly available materials.

Hiding a Realistic Object Using a Broadband Terahertz Invisibility Cloak

The first experimental demonstration of a 3D THz cloaking device fabricated using a scalable Projection Microstereolithography process is reported, indicating that the THz invisibility cloak has successfully concealed both the geometrical and spectroscopic signatures of the absorber, making it undetectable to the observer.

Electrically Driven Varifocal Silicon Metalens

Optical metasurfaces have shown to be a powerful approach to planar optical elements, enabling an unprecedented control over light phase and amplitude. At that stage, where a wide variety of static

Optical physics: How to hide in time

A system that can conceal an event in time in a fibre-based system, in which an event that causes a clear disturbance to a probe beam appears not to occur when the time cloak is turned on, could be a significant step towards full spatio-temporal cloaking.
...

References

SHOWING 1-10 OF 30 REFERENCES

An optical cloak made of dielectrics.

The optical 'carpet' cloak is designed using quasi-conformal mapping to conceal an object that is placed under a curved reflecting surface by imitating the reflection of a flat surface and enables broadband and low-loss invisibility at a wavelength range of 1,400-1,800 nm.

Optical cloaking with metamaterials

This work presents the design of a non-magnetic cloak operating at optical frequencies, and the principle and structure of the proposed cylindrical cloak are analysed and the general recipe for the implementation of such a device is provided.

Broadband Ground-Plane Cloak

An experimental realization of a cloak design that conceals a perturbation on a flat conducting plane, under which an object can be hidden, and results indicate that this type of cloak should scale well toward optical wavelengths.

Plasmonic materials in transparency and cloaking problems: mechanism, robustness, and physical insights.

It is demonstrated, using full-wave numerical simulations, how a homogeneous isotropic plasmonic material shell may basically "re-route" the impinging field in such a way to make dielectric and even conducting or metallic objects of a certain size nearly transparent to an outside observer placed in its near as well as in its far field.

Metamaterial Electromagnetic Cloak at Microwave Frequencies

This work describes here the first practical realization of a cloak of invisibility, constructed with the use of artificially structured metamaterials, designed for operation over a band of microwave frequencies.

Optical Conformal Mapping

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.

Parallel-plate metamaterials for cloaking structures.

It is demonstrated, analytically and numerically, that it is possible to design metamaterial cloaks that significantly reduce the total scattering cross section of a given two-dimensional dielectric obstacle in some frequency band.

Analytical design of conformally invisible cloaks for arbitrarily shaped objects.

The application of NURBS in the design of arbitrary cloaks shows transformation optics to be a very general tool to interface with commercial softwares like 3D STUDIOMAX and MAYA.

Achieving transparency with plasmonic and metamaterial coatings.

  • A. AlúN. Engheta
  • Physics
    Physical review. E, Statistical, nonlinear, and soft matter physics
  • 2005
Here it is seen how a proper design of these lossless metamaterial covers near their plasma resonance may induce a dramatic drop in the scattering cross section, making these objects nearly "invisible" or "transparent" to an outside observer--a phenomenon with obvious applications for low-observability and noninvasive probe design.

Transmutation of singularities in optical instruments

We propose a method for eliminating a class of singularities in optical media where the refractive index goes to zero or infinity at one or more isolated points. Employing transformation optics, we