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Macroscopic invisibility cloaking of visible light.

Chen X, Luo Y, Zhang J, Jiang K, Pendry JB, Zhang S - Nat Commun (2011)

Bottom Line: All the invisibility cloaks demonstrated thus far, however, have relied on nano- or micro-fabricated artificial composite materials with spatially varying electromagnetic properties, which limit the size of the cloaked region to a few wavelengths.The cloak operates at visible frequencies and is capable of hiding, for a specific light polarization, three-dimensional objects of the scale of centimetres and millimetres.Our work opens avenues for future applications with macroscopic cloaking devices.

View Article: PubMed Central - PubMed

Affiliation: School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK.

ABSTRACT
Invisibility cloaks, which used to be confined to the realm of fiction, have now been turned into a scientific reality thanks to the enabling theoretical tools of transformation optics and conformal mapping. Inspired by those theoretical works, the experimental realization of electromagnetic invisibility cloaks has been reported at various electromagnetic frequencies. All the invisibility cloaks demonstrated thus far, however, have relied on nano- or micro-fabricated artificial composite materials with spatially varying electromagnetic properties, which limit the size of the cloaked region to a few wavelengths. Here, we report the first realization of a macroscopic volumetric invisibility cloak constructed from natural birefringent crystals. The cloak operates at visible frequencies and is capable of hiding, for a specific light polarization, three-dimensional objects of the scale of centimetres and millimetres. Our work opens avenues for future applications with macroscopic cloaking devices.

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Related in: MedlinePlus

Angles of deviation for TE polarization.(a) Schematic of the ray tracing for an incident beam with TE polarization, which is split into two because of reflection by the cloak. (b) The calculated angles of deviation, φ1, φ2, of the beams reflected by the protruding bottom surface, are plotted against the incident angle θ (solid lines), and found to be in good agreement with the measurement (solid squares).
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f6: Angles of deviation for TE polarization.(a) Schematic of the ray tracing for an incident beam with TE polarization, which is split into two because of reflection by the cloak. (b) The calculated angles of deviation, φ1, φ2, of the beams reflected by the protruding bottom surface, are plotted against the incident angle θ (solid lines), and found to be in good agreement with the measurement (solid squares).

Mentions: As an incident beam with TE polarization does not experience cloaking effect, significant splitting has been observed as shown in Figure 3e–g at various incident angles. The angles of the split images for TE polarization are calculated with a simple ray-tracing analysis (see Methods), and found to be consistent with the experimental observations (Fig. 6). The angle of deviation for each TE polarized reflected beam is above 17° at all incident angles, and the angle formed between them is over 34°.


Macroscopic invisibility cloaking of visible light.

Chen X, Luo Y, Zhang J, Jiang K, Pendry JB, Zhang S - Nat Commun (2011)

Angles of deviation for TE polarization.(a) Schematic of the ray tracing for an incident beam with TE polarization, which is split into two because of reflection by the cloak. (b) The calculated angles of deviation, φ1, φ2, of the beams reflected by the protruding bottom surface, are plotted against the incident angle θ (solid lines), and found to be in good agreement with the measurement (solid squares).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3105339&req=5

f6: Angles of deviation for TE polarization.(a) Schematic of the ray tracing for an incident beam with TE polarization, which is split into two because of reflection by the cloak. (b) The calculated angles of deviation, φ1, φ2, of the beams reflected by the protruding bottom surface, are plotted against the incident angle θ (solid lines), and found to be in good agreement with the measurement (solid squares).
Mentions: As an incident beam with TE polarization does not experience cloaking effect, significant splitting has been observed as shown in Figure 3e–g at various incident angles. The angles of the split images for TE polarization are calculated with a simple ray-tracing analysis (see Methods), and found to be consistent with the experimental observations (Fig. 6). The angle of deviation for each TE polarized reflected beam is above 17° at all incident angles, and the angle formed between them is over 34°.

Bottom Line: All the invisibility cloaks demonstrated thus far, however, have relied on nano- or micro-fabricated artificial composite materials with spatially varying electromagnetic properties, which limit the size of the cloaked region to a few wavelengths.The cloak operates at visible frequencies and is capable of hiding, for a specific light polarization, three-dimensional objects of the scale of centimetres and millimetres.Our work opens avenues for future applications with macroscopic cloaking devices.

View Article: PubMed Central - PubMed

Affiliation: School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK.

ABSTRACT
Invisibility cloaks, which used to be confined to the realm of fiction, have now been turned into a scientific reality thanks to the enabling theoretical tools of transformation optics and conformal mapping. Inspired by those theoretical works, the experimental realization of electromagnetic invisibility cloaks has been reported at various electromagnetic frequencies. All the invisibility cloaks demonstrated thus far, however, have relied on nano- or micro-fabricated artificial composite materials with spatially varying electromagnetic properties, which limit the size of the cloaked region to a few wavelengths. Here, we report the first realization of a macroscopic volumetric invisibility cloak constructed from natural birefringent crystals. The cloak operates at visible frequencies and is capable of hiding, for a specific light polarization, three-dimensional objects of the scale of centimetres and millimetres. Our work opens avenues for future applications with macroscopic cloaking devices.

Show MeSH
Related in: MedlinePlus