Total transmission plays an important role in efficiency improvement and wavefront control,and has made great progress in many applications,such as the optical film and signal transmission.Therefore,many traditional p...Total transmission plays an important role in efficiency improvement and wavefront control,and has made great progress in many applications,such as the optical film and signal transmission.Therefore,many traditional physical methods represented by transformation optics have been studied to achieve total transmission.However,these methods have strict limitations on the size of the photonic structure,and the calculation is complex.Here,we exploit deep learning to achieve this goal.In deep learning,the data-driven prediction and design are carried out by artificial neural networks(ANNs),which provide a convenient architecture for large dataset problems.By taking the transmission characteristic of the multi-layer stacks as an example,we demonstrate how optical materials can be designed by using ANNs.The trained network directly establishes the mapping from optical materials to transmission spectra,and enables the forward spectral prediction and inverse material design of total transmission in the given parameter space.Our work paves the way for the optical material design with special properties based on deep learning.展开更多
The propagation of acoustic waves is a fundamental topic in shallow ocean acoustics.We numerically demonstrate a three-dimensional zone of silence consisting of a circular tube with gradient index metamaterials attach...The propagation of acoustic waves is a fundamental topic in shallow ocean acoustics.We numerically demonstrate a three-dimensional zone of silence consisting of a circular tube with gradient index metamaterials attached to its rigid wall.The cloaking effect is verified by fine agreement with analytical calculations.展开更多
By introducing a new mechanism based on purely imaginary metamaterials （PIMs）, we reveal that bidirectional negative refraction and planar focusing can be obtained using a pair of PIM slabs, over- coming the unidire...By introducing a new mechanism based on purely imaginary metamaterials （PIMs）, we reveal that bidirectional negative refraction and planar focusing can be obtained using a pair of PIM slabs, over- coming the unidirectional limit in parity-time （PT）-symmetric systems. Compared with PT-symmetric systems, which require two different types of materials, the proposed negative refraction can be realized using two identical media. In addition, asymmetric excitation with bidirectional total transmission is observed in our PIM system. Therefore, a new way to realize negative refraction with properties that are unavailable in PT-symmetrie systems is presented.展开更多
Starting from optical nihility media (ONM),we design several intriguing devices with transformation optics method in two dimensions,such as a wave splitter,a concave lens,a field rotator,a concentrator,and an invisibi...Starting from optical nihility media (ONM),we design several intriguing devices with transformation optics method in two dimensions,such as a wave splitter,a concave lens,a field rotator,a concentrator,and an invisibility cloak.Though the extreme anisotropic property of ONM hinders the fabrication of these devices.We demonstrate that those devices could be effectively realized by simplified materials with Fabry-Pérot resonances (FPs) at discrete frequencies.Moreover,we propose a reduced version of simplified materials with FPs to construct a concentrator and a rotator,which is feasible in experimental fabrications.The simulations of total scattering cross-sections confirm their functionalities.展开更多
We propose a simple method to design field concentrators of arbitrary shapes based on Fabry-Perot resonances. The material parameters are feasible in terms of metallic layered structures and gradient index dielectrics...We propose a simple method to design field concentrators of arbitrary shapes based on Fabry-Perot resonances. The material parameters are feasible in terms of metallic layered structures and gradient index dielectrics. The functionalities are well confirmed by numerical simulations.展开更多
We present a series of invisibility concentrators with simplified material parameters beyond trans- formation optics. One of them can achieve the perfect invisible effect at frequencies of Fabry-Perot resonances, whil...We present a series of invisibility concentrators with simplified material parameters beyond trans- formation optics. One of them can achieve the perfect invisible effect at frequencies of Fabry-Perot resonances, while others have very small scattering. The required materials are feasible in practice. Analytical calculations and numerical simulations confirm the functionalities of these devices.展开更多
In this paper, we propose a simple method of illusion optics based on conformal mappings. By carefully developing designs with specific conformal mappings, one can make an object look like another with a significantly...In this paper, we propose a simple method of illusion optics based on conformal mappings. By carefully developing designs with specific conformal mappings, one can make an object look like another with a significantly different shape. In addition, the illusion optical devices can work in a broadband of frequencies.展开更多
We perform a semi-analytical calculation of the field distributions of a conformal invisible device via mode expansions. For a discrete set of frequencies in the regime of wave optics, the conformal invisible device i...We perform a semi-analytical calculation of the field distributions of a conformal invisible device via mode expansions. For a discrete set of frequencies in the regime of wave optics, the conformal invisible device is perfectly transparent, which stems from the special conformal mapping and the refractive- index profile of the Mikaelian lens.展开更多
In this letter, we design a perfect field rotator that is by itself invisible and can rotate the electro- magnetic （EM） wave front. The device here is designed for a dielectric background and is composed of merely a...In this letter, we design a perfect field rotator that is by itself invisible and can rotate the electro- magnetic （EM） wave front. The device here is designed for a dielectric background and is composed of merely an inner core with the same dielectric and an array of metal plates embedded in the air. Its broadband functionality is also numerically demonstrated.展开更多
基金supported by the National Key Research and Development Program of China under Grant No.2020YFA0710100the National Natural Science Foundation of China under Grants No.92050102,No.11874311,and No.11504306the Fundamental Research Funds for the Central Universities under Grant No.20720200074。
文摘Total transmission plays an important role in efficiency improvement and wavefront control,and has made great progress in many applications,such as the optical film and signal transmission.Therefore,many traditional physical methods represented by transformation optics have been studied to achieve total transmission.However,these methods have strict limitations on the size of the photonic structure,and the calculation is complex.Here,we exploit deep learning to achieve this goal.In deep learning,the data-driven prediction and design are carried out by artificial neural networks(ANNs),which provide a convenient architecture for large dataset problems.By taking the transmission characteristic of the multi-layer stacks as an example,we demonstrate how optical materials can be designed by using ANNs.The trained network directly establishes the mapping from optical materials to transmission spectra,and enables the forward spectral prediction and inverse material design of total transmission in the given parameter space.Our work paves the way for the optical material design with special properties based on deep learning.
基金National Natural Science Foundation of China(Grant No.11874311)Natural Science Foundation of Fujian Province,China(Grant No.2017J05015)。
文摘The propagation of acoustic waves is a fundamental topic in shallow ocean acoustics.We numerically demonstrate a three-dimensional zone of silence consisting of a circular tube with gradient index metamaterials attached to its rigid wall.The cloaking effect is verified by fine agreement with analytical calculations.
基金This work was supported by the National Natural Science Foundation of China （Grant No. 11604229）, the Natural Science Foundation of Jiangsu Province （Grant No. BK20171206）, the Postdoctoral Science Foundation of China （Grant No. 2015M580456）, and the Fundamental Research Fundsfor the Central Universities （Grant No. 20720170015）. Y. Xu is grateful for support from the Collaborative Innovation Center of Suzhou Nano Science and Technology at Soochow University.
文摘By introducing a new mechanism based on purely imaginary metamaterials （PIMs）, we reveal that bidirectional negative refraction and planar focusing can be obtained using a pair of PIM slabs, over- coming the unidirectional limit in parity-time （PT）-symmetric systems. Compared with PT-symmetric systems, which require two different types of materials, the proposed negative refraction can be realized using two identical media. In addition, asymmetric excitation with bidirectional total transmission is observed in our PIM system. Therefore, a new way to realize negative refraction with properties that are unavailable in PT-symmetrie systems is presented.
基金supported by the National Natural Science Foundation of China for Excellent Young Scientists (Grant No.61322504)the National Basic Research Program of China (Grant No.2013CB035901)+1 种基金the Fundamental Research Funds for the Central Universities (Grant No.20720170015)the National Natural Science Foundation of China (Grants Nos.51779224, 51579221,51279180,61705200, and 11874311).
文摘Starting from optical nihility media (ONM),we design several intriguing devices with transformation optics method in two dimensions,such as a wave splitter,a concave lens,a field rotator,a concentrator,and an invisibility cloak.Though the extreme anisotropic property of ONM hinders the fabrication of these devices.We demonstrate that those devices could be effectively realized by simplified materials with Fabry-Pérot resonances (FPs) at discrete frequencies.Moreover,we propose a reduced version of simplified materials with FPs to construct a concentrator and a rotator,which is feasible in experimental fabrications.The simulations of total scattering cross-sections confirm their functionalities.
基金This work was supported by the Fun- damental Research Funds for the Central Universities （Grant No. 20720170015） and the National Natural Science Foundation of China for Excellent Young Scientists （Grant No. 61322504）.
文摘We propose a simple method to design field concentrators of arbitrary shapes based on Fabry-Perot resonances. The material parameters are feasible in terms of metallic layered structures and gradient index dielectrics. The functionalities are well confirmed by numerical simulations.
基金This work was supported by the Fun- damental Research Funds for the Central Universities （grant No. 20720170015） and the National Science Foundation of China for Excellent Young Scientists （grant No. 61322504）. M. Z. and L. X. contributed equally to this work.
文摘We present a series of invisibility concentrators with simplified material parameters beyond trans- formation optics. One of them can achieve the perfect invisible effect at frequencies of Fabry-Perot resonances, while others have very small scattering. The required materials are feasible in practice. Analytical calculations and numerical simulations confirm the functionalities of these devices.
基金Acknowledgements This work was supported by the National Science Foundation of China for Excellent Young Scientists （Grant No. 61322504）, the Foundation for the Author of National Excellent Doctoral Dissertation of China （Grant No. 201217）, and the Priority Academic Program Development （PAPD） of Jiangsu Higher Education Institutions.
文摘In this paper, we propose a simple method of illusion optics based on conformal mappings. By carefully developing designs with specific conformal mappings, one can make an object look like another with a significantly different shape. In addition, the illusion optical devices can work in a broadband of frequencies.
基金This work was supported by the National Natural Science Foundation of China for Excellent Young Scientists （Grant No. 61322504）, the Foundation for the Author of National Excellent Doctoral Dissertation of China （Grant No. 201217）, andFundamental Research Funds for the Central Universities （Grant No. 20720170015）.
文摘We perform a semi-analytical calculation of the field distributions of a conformal invisible device via mode expansions. For a discrete set of frequencies in the regime of wave optics, the conformal invisible device is perfectly transparent, which stems from the special conformal mapping and the refractive- index profile of the Mikaelian lens.
文摘In this letter, we design a perfect field rotator that is by itself invisible and can rotate the electro- magnetic （EM） wave front. The device here is designed for a dielectric background and is composed of merely an inner core with the same dielectric and an array of metal plates embedded in the air. Its broadband functionality is also numerically demonstrated.
