Español

Based on Transform Optics: Realizing an Ideal Omnidirectional Invisible Cloak in Free Space

935
2024-04-29 16:03:41
Ver traducción

A team led by Professor Ye Dexin and Professor Chen Hongsheng from Zhejiang University, as well as Professor Yu Luo from Nanyang University of Technology, conducted practical research on full parameter transformation optical devices. The research team has designed and implemented an all parameter omnidirectional invisibility cloak based on the theory of linear transformation optics and omnidirectional matching transparent metamaterials, which can hide large objects in free space.

The research findings were published in the National Science Review under the title of "Omnidirectional Transformation Optical Devices with All Parameters". Dr. Yuan Gao from Zhejiang University was the first author, and Professor Yu Luo, Professor Chen Hongsheng, and Professor Ye Dexin were the corresponding authors.

In 2006, Professor Pendry from Imperial College London, UK, proposed transformation optics, which describes the correspondence between electromagnetic wave propagation paths and material composition parameters, providing a universal and powerful method for controlling electromagnetic waves.

In the past decade, transformation optics has developed rapidly, and various new optical devices have been designed through transformation optics, such as invisibility cloaks, electromagnetic illusion devices, and concentrators. However, the composition parameters of optical media transformation are anisotropic and often uneven or have singular values, making it difficult to achieve.

For example, the omnidirectional invisibility cloak achieved through experiments so far has always simplified the material parameters. Simplified design sacrifices impedance matching, thereby reducing the performance of transformation optical devices.

To address these issues, the research team designed a two-dimensional all parameter omnidirectional planar invisibility cloak based on linear transformation optics, which is composed of only two homogeneous materials. The composition parameters of the first material are anisotropic, with both zero and extreme values, and electromagnetic waves propagating along the optical direction have infinite phase velocities.

Design an ideal omnidirectional cloak in free space. (a) Stealth design based on linear transformation optical elements. (b) A schematic diagram of the actual cloak. (c) Simulate (I, II, III) and measure (IV, V, VI) stealth performance.

By using this material, electromagnetic waves can bypass the invisible region, achieving omnidirectional impedance matching and zero phase delay. The second material also has anisotropic composition parameters, which can achieve phase compensation under omnidirectional impedance matching, and electromagnetic waves propagating in the optical direction have sub cavity phase velocity.

In the experimental verification, researchers used these two materials with TM polarization wave full parameter composition parameters.
The first material is achieved using a subwavelength metal patch array with Fabry Perot resonance, while the second material is achieved using a structure composed of traditional I-type electric resonators and split ring resonators.

Finally, the researchers measured the magnetic field around the omnidirectional cloak composed of the first two materials under different angles of TM polarization wave incidence, and the results showed that it has excellent stealth performance.

This study presents for the first time a fully parametric omnidirectional invisibility cloak in free space, which can hide large objects under any incident light. The achieved invisibility cloak can be immediately used to suppress the scattering cross-section of targets in radar communication and bistable detection.

The method proposed in this study also has a profound impact on the practical application of other full parameter transformation optical devices.

Source: Physicist Organization Network

Recomendaciones relacionadas
  • Panacol showcases a new optical grade adhesive on Photonics West

    Panacol will showcase new optical grade resins and adhesives for embossing and optical bonding applications at the SPIE Photonics West exhibition held in San Francisco, California, USA from January 30 to February 1, 2024.These new adhesives can be used for sensors in lightweight carpets, smart devices, and wearable devices in the automotive industry, or for generating structured light in projector...

    2023-12-12
    Ver traducción
  • Scientists at St. Andrews University have made significant breakthroughs in compact laser research

    Scientists at St. Andrews University have made significant breakthroughs in compact laser research after decades of hard work.Laser is widely used in fields such as communication, medicine, measurement, manufacturing, and measurement around the world. They are used to transmit information on the internet, for medical purposes, and even in facial scanners on mobile phones. Most of these lasers are...

    2023-10-04
    Ver traducción
  • Breakthrough in Light Manipulation: Revealing New Finite Barrier Bound States

    Exploring the propagation and localization of waves in various media has always been a core focus of optics and acoustics. Specifically, in photonics and phononics, scientists have been dedicated to understanding and controlling the behavior of light and sound waves in periodic media.Photonic crystals have unique bandgap characteristics, providing an excellent platform for studying wave propagatio...

    2024-03-25
    Ver traducción
  • Veeco Instruments wins IBM big order

    On August 14th local time, Veeco Instruments, a well-known American laser annealing manufacturer, announced an important cooperation with technology giant IBM. It is reported that IBM has selected Veeco Instruments' WaferStorm wet processing system as support for its advanced packaging applications, and the two parties have signed a joint development agreement to explore the potential of utilizi...

    2024-08-23
    Ver traducción
  • 253 million US dollars! This Canadian medical fiber optic sensor manufacturer will be acquired

    Recently, Haemantics Corporation, which focuses on providing innovative medical solutions with proprietary optical technology, announced that the company has reached a final agreement. According to the agreement, Haemonics will acquire all outstanding shares of Canadian fiber optic sensor manufacturer OpSens for CAD 2.90 per share.This is an all cash transaction with a fully diluted equity value o...

    2023-10-18
    Ver traducción