Search · four archives
Search · four archives
18 papers · ranked by Valyu relevance
Luqman Ali, Qinlong Li, Tayyab Ali Khan, Jianjia Yi + 1 more
This paper presents a radar cross-section (RCS) reduction technique by using the coding diffusion metasurface, which is optimised through a random optimization algorithm. The design consists of two unit cells, which are elements ‘1’ and ‘0’. The reflection phase between the two-unit cells has a 180° ± 37° phase…
Ke Chen, Yijun Feng, Zhongjie Yang, Li Cui + 3 more
'Tian Jiang'] Ultrathin metasurface compromising various sub-wavelength meta-particles offers promising advantages in controlling electromagnetic wave by spatially manipulating the wavefront characteristics across the interface. The recently proposed digital coding metasurface could even simplify the design and…
Ali Momeni, Kasra Rouhi, Hamid Rajabalipanah, Ali Abdolali
Inspired by the information theory, a new concept of re-programmable encrypted graphene-based coding metasurfaces was investigated at terahertz frequencies. A channel-coding function was proposed to convolutionally record an arbitrary information message onto unrecognizable but recoverable parity beams generated by a…
Jianzhong Chen, Chengwei Zhang, Yutong Zhao, Lei Lin + 5 more
'Tao Su' 'Bian Wu' 'Jinshan Ding' 'George Kenanakis'] A polarization-insensitive diffusion metasurface using a period-changed unit cell is presented for reducing the radar cross-section (RCS) of metallic objects in ultrawideband. Two metallic Minkowski loops are proposed as coding elements, different from traditional…
Hengyi Sun, Zhuo Li, Changqing Gu, Qian Xu + 4 more
'Shengchen Lu' 'Ferran Martin'] The concept of metasurfaced reverberation chamber (RC) is introduced in this paper. It is shown that by coating the chamber wall with a rotating 1-bit random coding metasurface, it is possible to enlarge the test zone of the RC while maintaining the field uniformity as good as that in a…
Kasra Rouhi, Ali Abdolali, Susan Fallah
— In this paper, a wideband and low-scattering metasurface in terahertz (THz) is introduced. The proposed coding metasurface is composed of four different graphene square patches in one layer, which has a distinct bias voltage. By optimizing the chemical potential of each patch, the reflection phase and amplitude of a…
Mehdi Kiani, Ali Momeni, Majid Tayarani, Can Ding
Recently, investigation of metasurface has been extended to wave control through exploiting nonlinearity. Among all of the ways to achieve tunable metasurfaces with multiplexed performances, nonlinearity is one of the promising choices. Although several proposals have been reported to obtain nonlinear architectures at…
Seyed Ehsan Hosseininejad, Kasra Rouhi, Mohammad Neshat, Reza Faraji‐Dana + 3 more
'Reza Faraji‐Dana' 'Albert Cabellos‐Aparicio' 'Sergi Abadal' 'Eduard Alarcón'] Recent emergence of metasurfaces has enabled the development of ultra-thin flat optical components through different wavefront shaping techniques at various wavelengths. However, due to the non-adaptive nature of conventional metasurfaces…
Jie Zhao, Xi Yang, Jun Yan Dai, Qiang Cheng + 7 more
'Jun Chen Ke' 'Guo Dong Bai' 'Shuo Liu' 'Shi Jin' 'Tie Jun Cui'] Modern wireless communication is one of the most important information technologies, but its system architecture has been unchanged for many years. Here, we propose a much simpler architecture for wireless communication systems based on metasurface. We…
Ying Tian, Xufeng Jing, Haiyong Gan, Chenxia Li + 1 more
—To enhance transmission efficiency of Pancharatnam–Berry (PB) phase metasurfaces, multilayer split-ring resonators were proposed to develop encoding sequences. As per the generalized Snell's law, the deflection angle of the PB phase encoding metasurfaces depends on the metasurface period's size. Therefore, it is…
Steven H. Huang, Po-Ting Shen, Aditya Mahalanabish, Giovanni Sartorello + 3 more
Mid-Infrared (MIR) chemical imaging provides rich chemical information of biological samples in a label-free and non-destructive manner. Yet, its adoption to live-cell analysis is limited by the strong attenuation of MIR light in water, often necessitating cell culture geometries that are incompatible with the…
Anna Archetti, Matteo Bruzzone, Giulia Tagliabue, Marco dal Maschio
Bessel Beams (BBs) and BB lattices are structured-light excitation profiles frequently applied in material processing, nonlinear spectroscopy and in many fluorescence microscopy methods such as Light Sheet Microscopy (LSM). In LSM, BBs and BB-lattices offer wider excitation profiles, higher acquisition rate, enhanced…
Authors not listed
Conducting polymers (CPs) have been a versatile and effective material for dynamically controlling optical properties with applications ranging from electrochromic windows and displays to variable infrared (IR) emittance devices and terahertz modulators. In particular, its biocompatibility, flexibility, reversibility…
Steven H. Huang, Jiaruo Li, Zhiyuan Fan, Robert Delgado + 1 more
Infrared spectroscopy has found wide applications in the analysis of biological materials. A more recent development is the use of engineered nanostructures – plasmonic metasurfaces – as substrates for metasurface-enhanced infrared reflection spectroscopy (MEIRS). Here, we demonstrate that strong field enhancement from…
Yoshiaki Nishijima, Naoki To, Armandas Balcytis, Sauliur Juodkazis
Detailed spectral analysis of radiation absorption and scattering behaviors of metasurfaces was carried out via finite-difference time-domain (FDTD) photonic simulations. It revealed that, for typical metal-insulator-metal (MIM) nanodisc metasurfaces, absorbance and scattering cross-sections exhibit a ratio of…
Steven H. Huang, Dias Tulegenov, Gennady Shvets
The combination of a tunable quantum cascade laser (QCL) and plasmonic mid-infrared (MIR) metasurface is a powerful tool enabling label-free high-content microscopy of hydrated cells using the vibrational contrast of their constituent biomolecules. While the QCL provides a high-brightness source whose frequency can be…
Jacob Waitkus, JaeWoo Park, Theodore Ndukaife, Sui Yang + 1 more
This study demonstrates a silicon nanopillar metasurface coupled with localized surface plasmon resonance (LSPR) mediated by the presence of cephalexin antibiotics in solution for biosensing applications. A facile fabrication process was developed to create the metasurface on silicon wafers with a unique resonance…
Authors not listed
In the field of mid-infrared (m-IR) applications, there is a need to control thermal radiation from metal-insulator-metal (MIM) metasurfaces without any optical components. Here, we introduce the concept of metalens for the MIM metasurfaces. The finite difference time domain (FDTD) simulation was used to design the…