![]() ![]() Although the recent development of metamaterial make the nontrivial material with uncommon parameters possible to fabricate in real world, and some invisibility designs based on coordinate trasformation, such as carpet cloak or illusion cloak, have been demonstrated in laboratories, the ideal omnidirectional invisibility cloak with broad working frequency bandwidth still challenges the current fabrication technologies, especially in optical frequencies. The transformation technique often requires singular dielectric parameters or anisotropic parameters, that are difficult to implement in practice. Recently, due to the possibility of cancellation or reduction of the scattered wave from the scattering object, and the potential significance in non-invasive probing/sensing applications, invisibility cloaking based on metamaterials become a hot topic.įor designing the invisibility devices, the parameter distribution is usually obtained with the technique of coordinate transformation or scattering cancellation. Invisibility effects are usually generated with absorbing screens for eliminating the backscattering or reflection from objects. Invisibility cloak has drawn lots of attention in recent years. The proposed scattering cancellation scheme could be useful in non-invasive probing applications at visible and near-infrared wavelengths. The simulation results show that the 632.8 nm TE polarized light travels through the coated fiber optical nanoprobe with the wavefront undisturbed, and serve as evidence of the effectiveness of the designed invisibility coating. ![]() The required quasistatic parameters of the coating material are homogeneous and isotropic. As a demonstration, it is possible to obtain such scattering cancellation effect for a fiber optical nanoprobe, and fabricate the coating layers by simply etching cylinders or doping elements in silicon/SOI wafer. We propose to cancel the scattered wave using two layers of periodical subwavelength structures by coating the scattering object with the designed composite material. School of Science, MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing, Nanjing University of Science and Technology, Nanjing, China.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |