Based on transformation optics, we propose a device to detect the presence of a carpet cloaking structure at near field. By using complementary media, the detective device can optically cancel a certain volume of reflective metal and reveal the hidden medium inside the metal. The detective performance of this device is confirmed by full-wave finite-element simulations. It is shown that the detective device is invisible when there is no carpet cloak in the system, yet it becomes visible with the presence of the carpet cloak. The device works at near field, but the response can be found even at the far field. Furthermore, it is shown that the device can detect both anisotropic and isotropic carpet cloaking structures. The investigation may provide a unique method to detect a carpet cloak and contribute to the design of novel optical devices, such as far field detectors for a nanoscale medium.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1166/jnn.2013.6064 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Terahertz tunable vanadium dioxide metasurface for dynamic illusion and cloaking.
iScience
January 2024
School of Electronic Information, Hunan First Normal University, Changsha, Hunan 410205, China.
Realizing camouflage by illusion and cloaking based on the metasurface has received widespread attention recently. However, existing metasurface-based illusion and cloaking devices are valid for the incident wave with a specific frequency, angle, or polarization, or exhibit a single function. Therefore, a terahertz tunable vanadium dioxide (VO) metasurface carpet cloak is proposed for dynamic illusion and cloaking.
View Article and Find Full Text PDFUltrathin carpet cloak enabled by infinitely anisotropic medium.
Sci Rep
October 2023
Applied Electromagnetic Laboratory, School of Electrical Engineering, Iran University of Science and Technology, Tehran, 1684613114, Iran.
Thanks to the pioneering studies conducted on the fields of transformation optics (TO) and metasurfaces, many unprecedented devices such as invisibility cloaks have been recently realized. However, each of these methods has some drawbacks limiting the applicability of the designed devices for real-life scenarios. For instance, TO studies lead to bulky coating layer with the thickness that is comparable to, or even larger than the dimension of the concealed object.
View Article and Find Full Text PDFAll-dielectric carpet cloaks with three-dimensional anisotropy control.
Nanophotonics
June 2023
Graduate School of Engineering Science, Osaka University, Toyonaka, Japan.
In this article, we propose all-dielectric carpet cloaks composed of jungle gym shaped dielectric unit cells and present a design strategy for three-dimensional (3-D) anisotropy control based on the transformation optics. The carpet cloaks are 3-D printable and operate with polarization independent incident waves in arbitrary incident angles due to the 3-D anisotropy control. Realizable anisotropic permittivities of cubic and rectangular unit cells are numerically studied based on the relative permittivity and loss tangent of = 2.
View Article and Find Full Text PDFLow profile multi-layered invisibility carpet cloak using quantum dot core-shell nanoparticles.
Sci Rep
March 2023
School of Electrical and Computer Engineering, College of Engineering, University of Tehran, Tehran, 1417614411, Iran.
In this paper, a method to reduce the profile of layered carpet cloaks is proposed. We analytically prove and numerically demonstrate that using a Low Index Material (LIM), a material with a relative dielectric constant smaller than 1, in construction of carpet cloaks can remarkably reduce their profiles. Using the proposed technique, a carpet cloak consisting of alternating LIM and silicon layers is designed to provide invisibility at visible wavelengths.
View Article and Find Full Text PDFDeveloping a carpet cloak operating for a wide range of incident angles using a deep neural network and PSO algorithm.
Sci Rep
January 2023
School of Electrical and Computer Engineering, College of Engineering, University of Tehran, Tehran, Iran.
Designing invisibility cloaks has always been one of the most fascinating fields of research; in this regard, metasurface-based carpet cloaks have drawn researchers' attention due to their inherent tenuousness, resulting in a lower loss and easier fabrication. However, their performances are dependent on the incident angle of the coming wave; as a result, designing a carpet cloak capable of rendering objects under it invisible for a wide range of angles requires advanced methods. In this paper, using the Particle Swarm Optimization (PSO) algorithm, along with a trained neural network, a metasurface-based carpet cloak is developed capable to operate for a wide range of incident angles.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!