Article
Nanoscience & Nanotechnology
J. Enrique Vazquez-Lozano, Inigo Liberal
Summary: This work investigates vacuum amplification effects in anisotropic temporal boundaries and shows that the anisotropy of the temporal boundary provides control over the angular distribution of the generated photons, leading to various vacuum amplification effects.
Article
Materials Science, Multidisciplinary
Xing Chen, Li Cai, Jihong Wen
Summary: This paper presents an approach to achieve fluid-like anisotropic density using pentamode materials, and designs and fabricates an underwater bend acoustic waveguide with anisotropic density to demonstrate its effectiveness. Simulation results show that wider bandwidth acoustic modulation effect can be obtained compared to anisotropic-modulus design using pentamode materials. In-depth and comprehensive analysis of the mechanisms of the broadband characteristics is provided through calculation of the band structure and analysis of the vibration modes of the pentamode metamaterials constituting the acoustic waveguides.
FRONTIERS IN MATERIALS
(2022)
Article
Multidisciplinary Sciences
Shi En Kim, Fauzia Mujid, Akash Rai, Fredrik Eriksson, Joonki Suh, Preeti Poddar, Ariana Ray, Chibeom Park, Erik Fransson, Yu Zhong, David A. Muller, Paul Erhart, David G. Cahill, Jiwoong Park
Summary: This study reports extremely anisotropic thermal conductors based on large-area van der Waals thin films with random interlayer rotations, achieving high thermal conductivity ratios.
Article
Materials Science, Multidisciplinary
Zhibo Wei, Zhou Hu, Rui Zhu, Yan Chen, Gengkai Hu
Summary: This paper proposes a novel design for a three-dimensional pentamode metamaterial, which can exhibit both anisotropic and isotropic properties by changing its geometry. Experimental results demonstrate that this pentamode metamaterial can manipulate the amplitude and wavefront of acoustic waves, providing a wider platform for tunable control of acoustic waves in fluids.
MATERIALS & DESIGN
(2023)
Article
Optics
Harry Miyosi Silalahi, Wei-Fan Chiang, Yi-Hong Shih, Wan-Yi Wei, Jou-Yu Su, Chia-Yi Huang
Summary: This study successfully fabricates a folding metamaterial with split-ring resonators (SRRs) to enhance electromagnetic resonance and achieve detection of aqueous solutions. The folding metamaterial has great potential in detecting products of live microorganisms with geometrical sizes up to several hundreds of micrometers.
PHOTONICS RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
Geunchang Choi, Yeeun Roh, Minah Seo
Summary: This article proposes a terahertz nanofuse that uses irreversible modulations in transmitted terahertz through nanowires-combined nanoantenna structures. Semiconductor and metal nanowires undergo irreversible reconfiguration in their geometry at an incident field of 20 kV/cm. The concept is explained by terahertz-field-induced ionization or electromigration. The nanofuse has potential applications as an optical fuse to protect sensitive terahertz devices under excessive field focus.
Article
Computer Science, Information Systems
An Qi Ge, Ming Wei Zhuang, Jie Liu, Qing Huo Liu
Summary: Waveguide problems related to elastic and acoustic wave propagation are fundamental, and the introduction of elastic metamaterials has expanded the research horizon, requiring new features not obtainable by traditional solvers. A spectral element method (SEM) was developed to simulate these problems in anisotropic media, demonstrating significant advantages in accuracy and efficiency compared to traditional finite element methods (FEM).
Article
Physics, Applied
Bo Yan, Bo Yu, Jingfeng Xu, Yukun Li, Zhigang Wang, Zhengxin Wang, Bo Yu, Haoyu Ma, Cheng Gong
Summary: The meta-waveguide proposed in this study is a component based on metamaterials and waveguides that can customize the phase and absorption of devices by adjusting quasi-periodic metamaterial resonators and film resistors. The structure and physical mechanism of phase control were analyzed, and an equivalent circuit model was proposed to explain absorption control mechanism. A customized meta-waveguide operating from 90 to 100 GHz was designed, fabricated, and demonstrated.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Wei Cao, Ziyu Wang, Ling Miao, Jing Shi, Rui Xiong
Summary: The pressure-induced thermoelectric properties of Pnma SnSe were investigated using first-principles calculations. The results show that pressure can significantly modify the band structure and lattice thermal conductivity of Pnma SnSe, enhancing its electronic transport properties and thermoelectric performance. These findings are important for the design of new thermoelectric materials.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Acoustics
Colby W. Cushing, Matthew J. Kelsten, Xiaoshi Su, Preston S. Wilson, Michael R. Haberman, Andrew N. Norris
Summary: This study attempts to experimentally verify anisotropic sound speeds predicted by finite element simulations using additively manufactured anisotropic 3D pentamode samples made of titanium. The results show that the deconvolution method can extract the band limited impulse response data, and a technique to extract the longitudinal PM wave speed for frequency domain simulations is given.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Multidisciplinary Sciences
Ruey-Bing Hwang
Summary: The research employed the Floquet-Bloch theory to analyze the characteristics of periodic reflections in a stack of graphene layers. It was found that there exists a Floquet-Bloch mode with pure real effective refractive index and extremely low Bloch impedance in the frequency band.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Applied
I. R. Hooper
Summary: This study demonstrates that increasing the light-matter interaction for millimeter waves using diffractively coupled waveguide modes significantly improves the photomodulation efficiency by more than two orders of magnitude, while maintaining the switching speed of the bare wafer.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Multidisciplinary
Yilong Luan, Hamidreza Zobeiri, Xinwei Wang, Eli Sutter, Peter Sutter, Zhe Fei
Summary: Novel materials supporting in-plane anisotropic polaritons have attracted research interest due to their capability of shaping nanoscale field distributions and controlling nanophotonic energy flows. In this study, waveguide exciton polaritons (EPs) in tin sulfide (SnS) were studied using scattering-type scanning near-field optical microscopy (s-SNOM). The results showed that the EPs in SnS exhibit anisotropic behavior in terms of wavelength and propagation length, which is attributed to the different optical band gaps and exciton binding energies along the crystal axes.
Article
Chemistry, Multidisciplinary
Shuo Yuan, Jijun Feng, Zhiheng Yu, Jian Chen, Haipeng Liu, Yishu Chen, Song Guo, Fengli Huang, Ryoichi Akimoto, Heping Zeng
Summary: This article proposes a silicon nanowire-assisted AWG structure that achieves high uniformity and low insertion loss. By comparing the effect of nanowire number and shape, it is found that double nanowires provide the best performance. Compared to conventional 8- and 16-channel AWGs, the presented structure significantly improves non-uniformity without increasing size.
Article
Optics
Syed Z. Ahmed, Ishtiaque Ahmed, Md Borhan Mia, Nafiz Jaidye, Sangsik Kim
Summary: This letter presents a high extinction ratio and compact on-chip polarization beam splitter based on extreme skin-depth (eskid) waveguide, achieving ultra-high extinction ratio and compact coupling length. Through efficient cross-coupling of TM mode and suppression of TE polarization, it meets the requirements for high degree of polarization distinguishability.