Article
Chemistry, Physical
Ning Li, Xiangdong Guo, Xiaoxia Yang, Ruishi Qi, Tianyu Qiao, Yifei Li, Ruochen Shi, Yuehui Li, Kaihui Liu, Zhi Xu, Lei Liu, F. Javier Garcia de Abajo, Qing Dai, En-Ge Wang, Peng Gao
Summary: The study successfully measured and observed phonon polaritons in monolayer hexagonal boron nitride using monochromatic electron energy-loss spectroscopy, revealing highly confined and ultraslow group velocity characteristics. The large momentum compensation provided by electron beams also enabled phonon polariton excitation over the entire Reststrahlen band of multilayer hexagonal boron nitride.
Article
Chemistry, Multidisciplinary
Dominik M. Juraschek, Prineha Narang
Summary: Research shows that monolayers of perovskite oxides are promising candidates for polaritonic platforms, offering new possibilities in tunability and spectral ranges.
Article
Chemistry, Multidisciplinary
Yingjie Wu, Qingdong Ou, Shaohua Dong, Guangwei Hu, Guangyuan Si, Zhigao Dai, Cheng-Wei Qiu, Michael S. Fuhrer, Sudha Mokkapati, Qiaoliang Bao
Summary: Phonon polaritons can be effectively and tunably reflected at embedded interfaces in hydrogen-intercalated alpha-MoO3 flakes, with low losses, high efficiency, and potential electrical tunability.
ADVANCED MATERIALS
(2021)
Article
Optics
Ying Zeng, Tian Sun, Runkun Chen, Weiliang Ma, Qizhi Yan, Dunzhu Lu, Tianwei Qin, Caixing Hu, Xiaosheng Yang, Peining Li
Summary: This study reports the optical nanoimaging of highly-confined phonon polaritons in atomically-thin nanoribbons of α-MoO3. It is found that narrow α-MoO3 nanoribbons as thin as a few atomic layers can support anisotropic phonon polaritons modes with a high confinement ratio. The interference patterns of anisotropic phonon polaritons in atomic layers are tunable depending on the wavelength and illumination frequency, and spatial control over the interference patterns is achieved by varying the nanostructures' shape or nanoribbon width.
Article
Nanoscience & Nanotechnology
Zhaojian Zhang, Junbo Yang, Dingbo Chen, Xinpeng Jiang
Summary: This study proposes an atom-thin metasurface utilizing monolayer hexagonal boron nitride, which can support low-loss surface phonon polaritons in the mid-infrared region. The monolayer hBN disk array and ring array can achieve SPhP resonances with ultra-small effective mode volumes and high quality factors in the mid-infrared region.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Chemistry, Multidisciplinary
Andrea Konecna, Jiahan Li, James H. Edgar, F. Javier Garcia de Abajo, Jordan A. Hachtel
Summary: Hyperbolic phonon polaritons in hexagonal boron nitride enable direct manipulation of mid-infrared light at nanometer scales, with high-resolution EELS facilitating measurements and nanoscale spatial resolution maintained. The electron beam serves as a precise source and probe of HPhPs, allowing observation of nanoscale confinement and extraction of hBN polariton dispersions. The research reveals important phenomena like localized polaritons induced by environmental heterogeneity and strong modifications of high-momenta excitations by nanoscale heterogeneity.
Article
Chemistry, Multidisciplinary
Guanyu Lu, Christopher R. Gubbin, J. Ryan Nolen, Thomas Folland, Marko J. Tadjer, Simone De Liberato, Joshua D. Caldwell
Summary: Strong coupling between optical modes can modify the energy-momentum dispersion relation, offering potential avenues for tuning thermal emission properties. Experimentally and theoretically exploring energy exchange, mode evolution, and coupling strength between polariton branches, our results demonstrate significant improvements in spatial coherence and quality factor of polaritonic modes, providing opportunities for electrically driven emission.
Article
Chemistry, Multidisciplinary
Fengsheng Sun, Wuchao Huang, Zebo Zheng, Ningsheng Xu, Yanlin Ke, Runze Zhan, Huanjun Chen, Shaozhi Deng
Summary: In this study, an analytical waveguide model is developed to describe polariton propagations in van der Waals crystals. The model is verified by real-space optical nano-imaging and numerical simulation, providing an analytical rationale for understanding the localized electromagnetic fields associated with polaritons in van der Waals crystals. The proposed model is applicable to other polaritonic crystals within the van der Waals family with corresponding dielectric substitutions.
Article
Chemistry, Multidisciplinary
Rui Xu, Tong Lin, Jiaming Luo, Xiaotong Chen, Elizabeth R. R. Blackert, Alyssa R. R. Moon, Khalil M. M. JeBailey, Hanyu Zhu
Summary: Photonics in the 5-15 THz range can open up new possibilities in quantum materials manipulation and biosensing. The use of SrTiO3 as a quantum paraelectric material enables the production of broadband surface phonon-polaritonic devices. These devices have been shown to significantly enhance THz pulses and can be used for studying quantum materials and molecular spectroscopy.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Shuta Kitade, Atsushi Yamada, Ikki Morichika, Kazuhiro Yabana, Satoshi Ashihara
Summary: A nonlinear shift in the dispersion relation of surface phonon-polaritons was observed through experimental and theoretical models, uncovering potential origins and paving the way for self-phase modulation and four-wave mixing. This nonlinear phenomenon, characterized by instantaneous frequency shifts and picosecond recoveries, holds promise for advances in nonlinear phonon-polaritonics.
Article
Multidisciplinary Sciences
Daniel B. Moore, Gareth P. Ward, John D. Smith, Alastair P. Hibbins, J. Roy Sambles, Timothy A. Starkey
Summary: This study discovers the existence of confined coupled acoustic line-modes with a hybrid character on the symmetric and anti-symmetric surfaces of a glide-symmetric waveguide, exhibiting a nearly constant group velocity without forming a band gap within a broad frequency range. The hybrid character of these confined modes can be tuned by adjusting the spacing between the two surfaces.
SCIENTIFIC REPORTS
(2022)
Article
Multidisciplinary Sciences
J. Duan, G. Alvarez-Perez, A. I. F. Tresguerres-Mata, J. Taboada-Gutierrez, K. V. Voronin, A. Bylinkin, B. Chang, S. Xiao, S. Liu, J. H. Edgar, J. Martin, V. S. Volkov, R. Hillenbrand, J. Martin-Sanchez, A. Y. Nikitin, P. Alonso-Gonzalez
Summary: The paper investigates refraction between anisotropic media, focusing on the propagation of hyperbolic phonon polaritons through alpha -MoO3 nanoprisms. The study reveals a bending-free refraction effect and sub-diffractional focusing with foci size as small as 1/50 of the light wavelength in free space, showing potential for effective control of energy flow at the nanoscale.
NATURE COMMUNICATIONS
(2021)
Article
Optics
Weixiang Xia, Gaige Zheng
Summary: The manipulation of resonant optical surface waves in the mid-infrared range has great potential for improving photonic devices and vibrational molecule sensing applications. In this study, the researchers investigated the manipulation of these waves using antennas supporting localized surface phonon polaritons. They found that the transverse dipole mode in a hollow cylinder array of 6H-silicon carbide showed excellent absorption efficiency and tunable capability across a wide spectral range. The researchers also explored the dependence of the local field on structural parameters and evaluated the near-field coupling mechanism.
Article
Materials Science, Multidisciplinary
Ryan A. Kowalski, Joshua Ryan Nolen, Georgios Varnavides, Sebastian Mika Silva, Jack E. Allen, Christopher J. Ciccarino, Dominik M. Juraschek, Stephanie Law, Prineha Narang, Joshua D. Caldwell
Summary: This study reports the exceptionally broad Reststrahlen bands of two Hf-based transition metal dichalcogenides (TMDs) that can support surface phonon polaritons (SPhPs) within the mid-infrared (mid-IR) into the terahertz (THz) range. The infrared transmission and reflectance spectra of hafnium disulfide (HfS2) and hafnium diselenide (HfSe2) flakes were measured, and their dielectric functions were extracted. The results show that these Hf-based TMDs have significantly broader Reststrahlen bands compared to other commonly explored TMDs, making them promising materials for nanophotonics and sensing applications in the mid- to far-infrared range.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Jiawei Huang, Lei Tao, Ningning Dong, Hongqiang Wang, Song Zhou, Jun Wang, Xiaoyue He, Kehui Wu
Summary: This study explores the launching and propagating properties of HPhPs in α-MoO3 along orthogonal crystal orientations using a holey silicon nitride microcavity, providing abundant possibilities for applications and operations in nanophotonics.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Physics, Applied
J. Barnett, D. Wendland, M. Lewin, K. G. Wirth, A. Hessler, T. Taubner
Summary: Surface phonon polaritons (SPhPs) are essential for nanophotonics due to their strong light-matter interaction on the nanoscale. SrTiO3 is a promising material for SPhPs with reversible and nonvolatile doping capabilities. By using s-SNOM measurements, physical quantities of SPhPs can be retrieved, showing the potential of SrTiO3 for programmable nanophotonics.
APPLIED PHYSICS LETTERS
(2022)
Article
Multidisciplinary Sciences
Nikolai C. Passler, Xiang Ni, Guangwei Hu, Joseph R. Matson, Giulia Carini, Martin Wolf, Mathias Schubert, Andrea Alu, Joshua D. Caldwell, Thomas G. Folland, Alexander Paarmann
Summary: The lattice symmetry of a crystal plays a crucial role in determining its physical properties. Low-symmetry crystals, especially those with extreme optical anisotropy, offer opportunities to control light propagation and polarization. In this study, monoclinic crystals are shown to support a new class of polaritons called hyperbolic shear polaritons, emerging due to shear phenomena in the dielectric response. These findings have implications for non-Hermitian and topological photonic states, and expand the design possibilities for compact photonic devices.
Article
Optics
Behrad Gholipour, Stephen R. Elliott, Maximilian J. Mueller, Matthias Wuttig, Daniel W. Hewak, Brian E. Hayden, Li Yifei, Seong Soon Jo, Rafael Jaramillo, Robert E. Simpson, Junji Tominaga, Cui Yihao, Avik Mandal, Benjamin J. Eggleton, Martin Rochette, Mohsen Rezaei, Imtiaz Alamgir, Hosne Mobarok Shamim, Robi Kormokar, Arslan Anjum, Gebrehiwot Tesfay Zeweldi, Tushar Sanjay Karnik, Juejun Hu, Safa O. Kasap, George Belev, Alla Reznik
Summary: Alloys of sulfur, selenium and tellurium, known as chalcogenide semiconductors, provide a versatile and controllable material platform for a range of photonic applications. They have nonlinear optical and photoconductive properties, wide transmission windows, and various dielectric and plasmonic properties across different frequencies. The roadmap collection emphasizes the critical role of chalcogenide semiconductors in traditional and emerging photonic technologies, and showcases the potential of this field through selected socio-economically important research areas.
JOURNAL OF PHYSICS-PHOTONICS
(2023)
Review
Chemistry, Multidisciplinary
Matthias Wuttig, Carl-Friedrich Schoen, Jakob Loetfering, Pavlo Golub, Carlo Gatti, Jean-Yves Raty
Summary: This article reviews the utilization of quantum chemical bonding descriptors in designing materials with tailored properties and their application in quantitatively describing bonding and its transition in chalcogenides. These descriptors can also predict material properties, including optical and transport properties. They can be used to tailor the properties of chalcogenides relevant for thermoelectrics, photovoltaics, and phase-change memories. The article also discusses a class of materials characterized by unconventional properties attributed to a novel bonding mechanism called metavalent. Promising research directions exploring property changes upon changing bonding mechanism and extending the concept of quantum chemical property predictors to more complex compounds are outlined in the conclusion.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Pierre Lucas, Wataru Takeda, Julian Pries, Julia Benke-Jacob, Matthias Wuttig
Summary: Many phase change materials (PCMs) can crystallize from the glassy state upon reheating, despite not exhibiting a glass transition endotherm. Experimental evidence shows that PCMs annealed below the glass transition temperature (T-g) have slower crystallization kinetics, even with an increase in sub-critical nuclei. Flash calorimetry reveals the hidden glass transition endotherm and a change in kinetics during the switch from the glassy to the supercooled liquid state.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Guangwei Hu, Weiliang Ma, Debo Hu, Jing Wu, Chunqi Zheng, Kaipeng Liu, Xudong Zhang, Xiang Ni, Jianing Chen, Xinliang Zhang, Qing Dai, Joshua D. Caldwell, Alexander Paarmann, Andrea Alu, Peining Li, Cheng-Wei Qiu
Summary: Various optical crystals with opposite permittivity components have been observed and characterized in the mid-infrared regime. These crystals possess hyperbolic polaritons with large-momenta optical modes and wave confinement, making them promising for nanophotonic on-chip technologies. Monoclinic CdWO4 crystals are shown to exhibit symmetry-broken hyperbolic phonon polaritons and offer new opportunities for polaritonic phenomena.
NATURE NANOTECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Xiang Ni, Giulia Carini, Weiliang Ma, Enrico Maria Renzi, Emanuele Galiffi, Soeren Wasserroth, Martin Wolf, Peining Li, Alexander Paarmann, Andrea Alu
Summary: A new form of leaky polaritons with lenticular dispersion contours, neither elliptical nor hyperbolic, is experimentally observed. These interface modes are strongly hybridized with propagating bulk states, enabling directional, long-range, sub-diffractive propagation at the interface. Despite their leaky nature, these leaky polaritons exhibit long modal lifetime and reveal opportunities arising from the interplay of extreme anisotropic responses and radiation leakage.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Riga Wu, Yuan Yu, Shuo Jia, Chongjian Zhou, Oana Cojocaru-Miredin, Matthias Wuttig
Summary: Grain boundaries (GBs) are important for controlling mass, heat, and charge transport. The scattering of charge carriers at GBs is found to depend on the misorientation angle, with low-angle GBs experiencing disruption of metavalent bonding (MVB) at dislocation cores and high-angle GBs completely destroying MVB due to Peierls distortion. The collapse of MVB leads to an enlargement of the GB barrier height, affecting charge transport.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Lukas Conrads, Andreas Hessler, Konstantin G. Wirth, Sebastian Meyer, Matthias Wuttig, Dmitry N. Chigrin, Thomas Taubner
Summary: Resonance tuning of nanoantennas is crucial for miniaturized active metasurfaces. Phase-change materials (PCMs) have been widely used for non-volatile resonance tuning by changing the refractive index. While conventional tuning is done by annealing the entire sample, recent research shows that individual rodantenna resonances can be adjusted by locally addressing each meta-atom with laser pulses. This work demonstrates the local switching of PCM-covered aluminum split-ring resonators (SRRs) to independently tune both electric and magnetic dipole resonances.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Lukas Conrads, Natalie Honne, Andreas Ulm, Andreas Hessler, Robert Schmitt, Matthias Wuttig, Thomas Taubner
Summary: This study demonstrates flexible encoding of different absorption/emission properties within a metasurface. By patterning cm-sized stripe gratings on an adaptable grating absorber metasurface using a commercial direct laser writing setup, the plasmonic phase-change material In3SbTe2 (IST) is locally switched between an amorphous and crystalline state to achieve control over the emissivity. The laser power and IST stripe width can be modified to encode different polarization-sensitive patterns with nearly perfect absorption. The results pave the way for low-cost, large-area, and adaptable metasurfaces with wavelength and polarization-selective perfect absorption for applications such as enhanced thermal detection, infrared camouflage, or encoding anti-counterfeiting symbols.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Christian Stenz, Julian Pries, T. Wesley Surta, Michael W. Gaultois, Matthias Wuttig
Summary: Glasses undergo structural relaxation that affects their physical properties. The combination of TEM electron diffraction and RMC simulations provides information on atomic arrangement. The study reveals structural changes in GeTe, with an increase in bond angle and a decrease in tetrahedrally coordinated Ge atoms. This finding sheds light on the atomic processes involved in structural relaxation in GeTe and other PCMs.
Article
Chemistry, Multidisciplinary
Matthias Wuttig, Carl-Friedrich Schoen, Dasol Kim, Pavlo Golub, Carlo Gatti, Jean-Yves Raty, Bart J. Kooi, Angel Martin Pendas, Raagya Arora, Umesh Waghmare
Summary: This passage discusses a family of solids with unconventional bonding characteristics. Despite disagreement about the nature of the bonds in these materials, it is shown that they are primarily electron-deficient. The unique properties of these materials can be attributed to an extended system of half-filled bonds, supporting the argument for the use of the term "metavalent bonding" to describe them.
Article
Chemistry, Physical
Yanhua Yue, Giacomo Melani, Harald Kirsch, Alexander Paarmann, Peter Saalfrank, Yujin Tong, R. Kramer Campen
Summary: This study investigated the surface phonon modes of differently terminated alpha-Al2O3(0001) surfaces in different environments using vibrational sum frequency spectroscopy (VSFS) and density functional theory (DFT) simulation. It was found that the surfaces do not interconvert under certain conditions, offering an explanation for the discrepancies in prior research and showing that surface phonon spectral response can be used as a novel probe of interfacial hydrogen bonding structure.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)