Panoramic lens designed with transformation optics

Wang, Huaping; Deng, Yangyang; Zheng, Bin; Li, Rujiang; Jiang, Yuyu; Dehdashti, Shahram; Xu, Zhiwei; Chen, Hongsheng

doi:10.1038/srep40083

Cited by 19 publications

(9 citation statements)

References 29 publications

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“…To eliminate the discontinuous absorption, the multi-unit combination of the proposed MA to construct the continuous broadband absorption was also proposed. Different from the similar construction applied in meta-surfaces [ 38 ] and graded-index devices [ 39 ], the proposed combined MA can be seen as a simple way to overlap the adjacent absorption peaks to construct the continuous and highly effective broadband absorption in the spectrum. Here, it should be noted that the combination of multi-unit still followed the original duty radio to keep the originally lightweight characteristic.…”

Section: Multi-unit Combinationsmentioning

confidence: 99%

Three-Dimensional Resistive Metamaterial Absorber Loaded with Metallic Resonators for the Enhancement of Lower-Frequency Absorption

et al. 2018

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Resistive patch array incorporating with metallic backplane provided an effective way to achieve broadband metamaterial absorbers (MAs) in microwave frequency, and the outstanding construction contributed more flexible and diversified broadband absorption. In this paper, we attempted to load metallic resonators (MRs) to three-dimensional resistive MA to further enhance the lower-frequency absorption performance. Simulation showed that the partial absorption peak was separated to the lower frequency, while the rest of broadband absorption was unaffected. Meanwhile, after combining multi-unit of the proposed MAs, the stair-stepping broadband absorption was also achieved. Finally, three samples were fabricated. The agreements between simulations and experimental results demonstrated that resistive MA loaded with MRs provided an effective way for further enhancement of lower-frequency absorption with almost no change of the absorbing structure and lightweight characteristic. Thus, it was worthy to expect a wide range of applications to emerge inspired from the proposed attempt.

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Section: Multi-unit Combinationsmentioning

confidence: 99%

Three-Dimensional Resistive Metamaterial Absorber Loaded with Metallic Resonators for the Enhancement of Lower-Frequency Absorption

et al. 2018

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“…TO is a strategy that can control the propagation of the electromagnetic wave due to the invariance of Maxwell’s equations under the coordinate transformation. It has motivated a series of researches 2 , such as cloaks 3 – 6 , illusion devices 7 , 8 , lenses 9 , 10 and antennas 11 . Besides, the concentrators 12 and rotators 13 , which can increase and rotate the EM energy in the inner region, have also attracted remarkable attention.…”

Section: Introductionmentioning

confidence: 99%

Homogeneous material based acoustic concentrators and rotators with linear coordinate transformation

Wang

Zhang

Shah

et al. 2021

Sci Rep

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With the ability to focus and rotate the acoustic field in a given region while keeping the outside region unchanged, the acoustic concentrator and rotator has been developed for the versatile manipulations of acoustic wave. In this letter, we report the design of acoustic concentrator and rotator facilitated by linear coordinate transformation. Compared with the previous ones that have inhomogeneous parameter distributions, the designed devices are composed of several parts with homogeneous parameters, which can be achieved with the help of few homogeneous layered structures. Simulations are also performed to verify the functions of the designed device. The proposed acoustic concentrators and rotators would be useful in numerous applications such as acoustic sensing and communication.

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“…Transformation optics (TO) has now attracted many peoples’ interest due to the manipulation feature of the electromagnetic (EM) waves in a user-defined manner. Ever since the proposal reported in 1 , 2 , the TO concept has motivated a series of studies on other functional and conceptual devices 3 – 22 in the field of wave-guiding 3 – 8 and in the field of antennas and lenses such as: focusing devices 9 – 11 , directive antennas 12 – 14 , multi-beam 15 – 17 , and isotropic emissions 18 , 19 . Moreover, the techniques of source transformation 23 – 28 have opened new ways for the design of active devices with source distribution recessed in the transformed space.…”

Section: Introductionmentioning

confidence: 99%

Non-contact method to freely control the radiation patterns of antenna with multi-folded transformation optics

Madni

Zheng

Zhu

et al. 2017

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In this paper, we propose to use multi-folded transformation optics method to design a non-contact illusion device that can distantly and freely manipulate the radiation behavior of antenna located at a certain distance and such manipulation is enabled by the use of mapped electromagnetic medium coated with the transformed medium. The proposed design aims to achieve the radiation pattern of our choice from the antenna that does not possess any electromagnetic medium. Based on this, the functionality of parabolic antenna is distantly achieved from the point source. We further extended our idea to array of antennas in which the proposed device distantly makes the linear array of antennas behave like a geometrically different array of antennas. Our work extends the concept of illusion optics for active scatterer that will be very helpful for future antenna design.

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Panoramic lens designed with transformation optics

Cited by 19 publications

References 29 publications

Three-Dimensional Resistive Metamaterial Absorber Loaded with Metallic Resonators for the Enhancement of Lower-Frequency Absorption

Three-Dimensional Resistive Metamaterial Absorber Loaded with Metallic Resonators for the Enhancement of Lower-Frequency Absorption

Homogeneous material based acoustic concentrators and rotators with linear coordinate transformation

Non-contact method to freely control the radiation patterns of antenna with multi-folded transformation optics

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