Article
Chemistry, Multidisciplinary
Jussi Kelavuori, Viatcheslav Vanyukov, Timo Stolt, Petri Karvinen, Heikki Rekola, Tommi K. Hakala, Mikko J. Huttunen
Summary: By breaking the symmetry of the nanoparticle surroundings, the properties of high quality factor SLRs can be easily modified. We demonstrated how changing the refractive index of the surrounding immersion oil by controlling the ambient temperature of the device can increase the quality factor of the SLR. These results show accurate and reversible modification of SLR properties, opening up possibilities for tunable SLR-based photonic devices.
Article
Thermodynamics
Liu Cui, Xinwang Guo, Qingsheng Yu, Gaosheng Wei, Xiaoze Du
Summary: This paper investigates the heat transport in graphene phononic metamaterials (GPMs) using molecular dynamics simulations. The results reveal that GPMs have lower thermal conductivities and stronger anisotropy compared to graphene nanoribbons (GNRs). The reduction in thermal conductivity is attributed to phonon localization, local resonance, and phonon boundary scattering. The thermal anisotropy results from the anisotropic relaxation times of phonons and the anisotropic contributions of low-frequency phonons.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
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
Physics, Applied
Zhihong Xu, Pan Li, Meiyu Liu, Qiujiao Du, Yifan Guo, Pai Peng
Summary: An ultrathin acoustic metasurface made up of an anisotropic three-component resonator is proposed, which can induce nondegenerate dipole resonances at the same resonant frequencies and modulate the phase delay based on polarization direction.
APPLIED PHYSICS EXPRESS
(2022)
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
Yiwen Liu, Lili Gui, Kun Xu
Summary: The research investigates enhanced second-harmonic generation in gold Fano metasurfaces using nonlinear scattering theory. By introducing structural asymmetries, the second-harmonic signal is further amplified. Under optimal conditions, the previously suppressed SHG component is released, resulting in a 6-fold enhancement in total SHG intensity.
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
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
Chemistry, Multidisciplinary
Alexander Zharov, Zacharias Viskadourakis, George Kenanakis, Vanessa Fierro, Alain Celzard
Summary: This study experimentally demonstrated the control of light transmission through a slab of plasmonic liquid metacrystal by an external electric field. The induced macroscopic anisotropy caused polarization-dependent suppression of transmission at resonant frequencies, indicating selective plasmon excitation based on the orientation of meta-atoms with respect to the electromagnetic wave polarization. Analyzed theoretically from first principles, the results were compared with experimental data.
Article
Materials Science, Multidisciplinary
Mengqi Liu, Weijin Chen, Guangwei Hu, Shanhui Fan, Demetrios N. Christodoulides, Changying Zhao, Cheng-Wei Qiu
Summary: Perfect absorbers that can completely absorb all incoming energy have been extensively studied and found to be associated with topological spectral phase singularities (SPS). The order of the topological invariant depends on the number of degenerate outgoing channels. By examining mirror-backed and all-dielectric structures, the generation, evolution, and annihilation of SPSs with different orders are revealed. A strategy based on charge conservation of SPSs has been established to design dual-band perfect absorbers. These findings highlight the topological origin of perfect absorption and its potential applications in biosensing, topological metasurfaces, and micro/nano thermal radiation.
Article
Materials Science, Multidisciplinary
Manuel J. Freire, Jesus Tornero, Ricardo Marques
Summary: This work demonstrates the use of metamaterial lenses to improve the signal-to-noise ratio of magnetic resonance imaging coils in low-field magnetic resonance imaging systems. The dominant source of noise in the signal-to-noise ratio in low-field magnetic resonance imaging systems is the metallization of the coil, while the contribution of noise sample or tissue can be neglected, unlike in high-field magnetic resonance imaging systems. A metamaterial lens composed of a three-dimensional array of capacitively loaded split rings was fabricated and tested on a 0.3 T MRI system. The experiment showed that the metamaterial lens was far enough from the coil to introduce negligible additional losses and tissue losses.
RESULTS IN PHYSICS
(2023)
Article
Multidisciplinary Sciences
James McInerney, Glaucio H. Paulino, D. Zeb Rocklin
Summary: This study develops a formalism to investigate the interplay between geometric symmetries and functionality in origami crease patterns. It reveals that the anticommuting symmetry defines a class of crease pattern geometries with equal and opposite Poisson's ratios.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Multidisciplinary
Yongkai Wang, Jialin Sun, Zhiduo Li, Qingyan Han, Wei Gao, Lipeng Zhu, Jun Dong, Zhongyue Zhang
Summary: This study introduces a disruption layer and molybdenum disulfide into an L-shaped chiral nanohole array to achieve dynamic adjustment of narrow-band CD signals. The CD signals can be generated and adjusted by changing the structural parameters and the environmental temperature. Furthermore, the structure exhibits a high-quality factor, aiding in the design of chiral devices and improving the sensitivity of chiral molecule detection.
Article
Chemistry, Multidisciplinary
Hojin Kim, Abdellatif Gueddida, Zuyuan Wang, Bahram Djafari-Rouhani, George Fytas, Eric M. Furst
Summary: Phononic materials can alter the propagation of acoustic waves and are useful for metamaterials. In this study, anisotropic crystals with dumbbell-shaped nanoparticles were fabricated, and direction-dependent phononic bandgaps were detected. The local resonances of the constituent nanoparticles enable metamaterial behavior. This study provides a structure-property relationship for designing anisotropic phononic materials with targeted phononic bandgaps.
Article
Optics
Tianlong Wen, Pengqian Wan, Chang Lu, Dainan Zhang, Min Gao, Yuan Lin, Qiye Wen, Yulong Liao, Huaiwu Zhang, Zhiyong Zhong
Summary: Active modulation of terahertz wave can be achieved by joining two terahertz metamaterials with a conductivity variable VO2 patch. The addition of a cut-wire metamaterial affects the electromagnetic response of the joined metamaterial dimer, resulting in dual resonance dips in the transmission spectrum for both insulating and conducting states of the VO2 patches.
Article
Optics
Leevi Kallioniemi, Leo Turquet, Harri Lipsanen, Martti Kauranen, Godofredo Bautista
OPTICS COMMUNICATIONS
(2020)
Article
Nanoscience & Nanotechnology
Peng Li, Khairul Alam, Henri Partanen, Markku Kuittinen, Guoguo Kang, Jari Turunen
Article
Optics
Mika Flinkman, Toni Saasatamoinen, Pertti Paakkonen, Joonas Lehtolahti, Pauli Falt, Hannu Laamanen
Article
Optics
Zahra Eslami, Piotr Ryczkowski, Lauri Salmela, Goery Genty
Article
Optics
Xiaorun Zang, Godofredo Bautista, Leo Turquet, Tero Setala, Martti Kauranen, Jari Turunen
Summary: A general approach for efficient excitation of hybridized plasmon modes in nanoantennas is proposed by focusing the incident light field on cylindrically polarized vector beams of various higher-order spiral phases. This method helps in designing an effective mode-matching field profile in the tightly focused region.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Physics, Multidisciplinary
Timo Stolt, Jeonghyun Kim, Sebastien Heron, Anna Vesala, Younghwan Yang, Jungho Mun, Minkyung Kim, Mikko J. Huttunen, Robert Czaplicki, Martti Kauranen, Junsuk Rho, Patrice Genevet
Summary: This study demonstrates phase-matched second-harmonic generation (SHG) from three-dimensional metamaterials consisting of stacked metasurfaces. By utilizing phase engineering of metasurfaces at interacting wavelengths, they achieved phase-matched SHG in the unconventional backward direction, with SHG signal scaling superlinearly with the number of layers. Their results inspire further research to achieve higher conversion efficiencies and address more complex wave fronts.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Abba Saleh, Piotr Ryczkowski, Goery Genty, Juha Toivonen
Summary: Real-time monitoring of flue gas parameters in combustion processes is crucial for improving process efficiency and reducing pollutant emissions. This study demonstrates simultaneous measurement of water vapor temperature and concentration in an industrial boiler using a broadband lidar, achieving excellent agreement with reference measurements. By utilizing backscattering from aerosol particles, the study also maps the water vapor concentration profile in the boiler, offering new perspectives for 3D profiling of temperature and gas concentration in industrial environments.
Article
Chemistry, Multidisciplinary
Faisal Ahmed, Abde Mayeen Shafi, David M. A. Mackenzie, Maaz Ahmed Qureshi, Henry A. Fernandez, Hoon Hahn Yoon, Md Gius Uddin, Markku Kuittinen, Zhipei Sun, Harri Lipsanen
Summary: The study found that annealing at temperatures between 500-525 K significantly enhances the performance of MoTe2 devices. At around 600 K, MoTe2 devices exhibit a transition in characteristics, indicating potential applications for thermal sensing.
ADVANCED MATERIALS INTERFACES
(2021)
Proceedings Paper
Nanoscience & Nanotechnology
Timo Stolt, Jeonghyun Kim, Sebastien Heron, Anna Vesala, Mikko J. Huttunen, Robert Czaplicki, Xiaorun Zang, Martti Kauranen, Junsuk Rho, Patrice Genevet
Summary: The nonlinear responses of 3D metamaterials can be improved by stacking metasurfaces and applying phase-matching techniques, leading to a significant enhancement in second-harmonic generation emission.
NANOPHOTONICS VIII
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Mikko J. Huttunen, Saad Bin-Alam, Orad Reshef, Y. Mamchur, Timo Stolt, Jean-Michel Menard, Ksenia Dolgaleva, Robert W. Boyd, Martti Kauranen
2020 22ND INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS (ICTON 2020)
(2020)
Proceedings Paper
Optics
Janvit Tippinit, Segolene Pelisset, Marian Baah, Markku Kuittinen, Matthieu Roussey
2020 PHOTONICS NORTH (PN)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Zahra Eslami, Piotr Ryczkowski, Lauri Salmela, Goery Genty
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Lauri Salmela, Coraline Lapre, John M. Dudley, Goery Genty
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Lauri Salmela, Coraline Lapre, John M. Dudley, Goery Genty
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)
Article
Chemistry, Multidisciplinary
Khairul Alam, Kabusure M. Kabusure, Benjamin O. Asamoah, Tarmo Nuutinen, Marian Baah, Sughra Mohamed, Antti Matikainen, Janne Heikkinen, Heikki Rekola, Matthieu Roussey, Markku Kuittinen, Tommi K. Hakala
