Article
Chemistry, Physical
Minglang Gao, Lingxiao Yu, Qian Lv, Feiyu Kang, Zheng-Hong Huang, Ruitao Lv
Summary: Two-dimensional transition metal dichalcogenides (TMDCs) have excitonic emission characteristics that make them an interesting platform for exploring novel physical phenomena and optoelectronic devices. However, the non-ideal photoluminescent intensity and quality of experimentally obtained monolayer TMDCs limit their further development for light-emission applications.
JOURNAL OF MATERIOMICS
(2023)
Article
Chemistry, Multidisciplinary
Qian Cai, Qiankun Ju, Wenting Hong, Chuanyong Jian, Taikun Wang, Wei Liu
Summary: This study demonstrates a chemical vapor deposition method to control the growth of large scale MoS2/MoSe2 vertical heterostructures on a molten glass substrate using water as the oxidizing agent, ensuring sufficient and uniform delivery of the metal precursor. This offers an efficient approach for developing integrated electronic and optoelectronic devices with other layered heterostructures.
Article
Chemistry, Physical
Shuyi Wu, Wen Pan, Jinlei Zhang, Chunlan Ma, Yun Shan, Lizhe Liu
Summary: Introducing sulfur vacancy defects to influence the photoluminescence properties of ReS2 enhances the electrical control of anisotropic excitons, paving the way for innovative exciton engineering in new 2D electronic and optoelectronic devices.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Physical
Peter S. Toth, Gabor Szabo, Csaba Janaky
Summary: The study investigates the impact of different surface domains on photoelectrochemical performance, revealing a decrease in PEC activity with thinner nanoflakes and a reduction in relative PEC activity due to introduced defects. Edge defects were found to have higher electrocatalytic activity compared to basal planes, although they also act as charge carrier recombination centers.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Akihiro Ohtake, Yoshiki Sakuma
Summary: Large-area two-dimensional MoSe2/WSe2 and WSe2/MoSe2 heterostructures have been successfully fabricated using molecular-beam epitaxy. Highly oriented heterostructures are composed of alternately stacked epitaxial MoSe2 and WSe2 monolayers on nearly stoichiometric substrates. The weakly bonded MoSe2 and WSe2 monolayers show stable C7 or T stacking configurations. Additionally, the four-layered heterostructures are achieved through the successive growth of MoSe2 and WSe2 monolayers.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Hyeong-Yong Hwang, Sehyuk Lee, Yong-Hoon Kim, Farman Ullah, Chinh Tam Le, Yong Soo Kim, Ki-Ju Yee, Christopher J. Stanton, Young-Dahl Jho
Summary: In two-dimensional transition metal dichalcogenides, strain modulation can manipulate electronic band structures and photoluminescence. A novel method of external bending is used to control the photoluminescence in monolayer WSe2-MoSe2 lateral heterostructures, where both normal strain and shear strain are involved. The dependence of the photoluminescence on bending direction and the violation of optical selection rules under tensile bending are observed, which indicates the mixing of spin subbands induced by shear strain.
Article
Physics, Applied
Vineeta Singh, V. G. Sathe, Shyama Rath
Summary: This work presents Raman spectroscopic protocols to determine various material parameters of two-dimensional MoSe2 films, including layer thickness, layer-dependent thermal conductivity, interlayer interactions, and anharmonicity. The Davydov splitting observed in the Raman mode provides a method for estimating the number of layers. The findings are important for the applications of 2D MoSe2 in low power electronic, optoelectronic, and thermoelectric devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Lauren Zundel, Juan R. Deop-Ruano, Rosario Martinez-Herrero, Alejandro Manjavacas
Summary: This study comprehensively investigates the response of periodic arrays of metallic nanostructures under finite-width light beam excitation, revealing the relationship between the response and light beam width, and exploring the impact of finite-size effects and light beam width on the system's response.
Article
Chemistry, Physical
Yuting Yang, Di Zhao, Lin Wang, Weiqi Wang, Xiaofeng Liu, Jianrong Qiu
Summary: By sonication-assisted exfoliation and photon-induced doping, 2D MoO3 nanostructures with strong localized surface plasmon resonance have been successfully synthesized, suggesting potential applications in photonics and sensing.
CHEMISTRY OF MATERIALS
(2022)
Article
Physics, Applied
Xingzhou Chen, Zheng Sun, Min Zhang, Ming Li, Zhigao Hu, Kenji Watanabe, Takashi Taniguchi, David Snoke, Zhe-Yu Shi, Jian Wu
Summary: We have designed and fabricated a vertical structure using a distributed Bragg reflector and dielectric material layer to enhance optical absorption in a stack of monolayer WS2 and MoS2. Our research shows a tenfold increase in absorption over a 100 nm spectral range, with the potential to achieve over 50% absorption by tuning the spacer layer thickness. Our theoretical model explains the dependence of absorption coefficient on spacer thickness as a solution of a non-Hermitian Schrodinger equation. These findings contribute to the development of broadband optical devices utilizing two-dimensional excitonic materials.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Xinyu Wang, Minghui Liu, Youxing Liu, Shengcong Shang, Changsheng Du, Jiaxin Hong, Wenqiang Gao, Chunyu Hua, Helin Xu, Zewen You, Jianyi Chen, Yunqi Liu
Summary: In this study, we report the topology-selective synthesis of two distinct varieties of 2D covalent organic framework (COF) materials by simply altering acid catalysts. The different reaction pathways result in the formation of COFs with different properties and applications. This work not only diversifies the topologies of COFs, but also provides examples of structure-property relationships, which are important for fundamental research and potential applications of COFs.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Chengyu He, Jing Li, Yanan Bao, Jianliang Li, Hengshan Wang, Mingqun Zhang, HuaFeng Li, Huayi Tang, Zhiguang Sun, Qi Zhang, Yurui Fang, Jiao Xu, Yiming Yang
Summary: A vapor-phase anion exchange method is developed to prepare robust 2D Ruddlesden-Popper perovskite heterostructures. Different diffusion behaviors of anions are observed depending on the specific organic cations, and the diffusion coefficients are calculated to reveal the anisotropic diffusion characteristics.
Article
Chemistry, Physical
Biao Wu, Haihong Zheng, Shaofei Li, Junnan Ding, Jun He, Zongwen Liu, Yanping Liu
Summary: Van der Waals heterostructures, formed by vertically stacking two different transition metal dichalcogenide monolayers, offer new opportunities for designing optoelectronic devices. In this study, we observed interlayer neutral excitons and trions in the MoSe2/MoS2/MoSe2 trilayer heterostructure, and found that the addition of a MoSe2 layer significantly increased the quantum yield of excitons. Our findings provide a promising platform for the development of more efficient optoelectronic devices and the exploration of new physical properties of transition metal dichalcogenides.
Article
Chemistry, Physical
Priya Das, Arun Chattopadhyay
Summary: We report the formation of two-dimensional single crystalline nanosheets of Cu nanoclusters by complexation with Zn metal ion. The so-formed crystals exhibit enhanced prompt photoluminescence and lifetime, as well as delayed photoluminescence with a quantum yield of 83.6 +/- 1.3% and a lifetime of 26.4 +/- 0.7 mu s at room temperature. Surface functionalization of the nanosheets with 8-hydroxyquinoline further increases the delayed photoluminescence lifetime to 145.0 +/- 7.7 mu s. The surface complexation creates a new emitting channel in the crystal, resulting in a single nanocomponent that emits prompt and delayed near-white light.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Suhyeon Kim, Sangho Yoon, Hyobin Ahn, Gangtae Jin, Hyesun Kim, Moon-Ho Jo, Changgu Lee, Jonghwan Kim, Sunmin Ryu
Summary: This study reports the dual-band near-infrared photoluminescence of CrPS4 crystals and reveals that its emission splits into fluorescence and phosphorescence depending on thickness, temperature, and defect density. The bifurcation of the emission is controlled by activated reverse intersystem crossing from low- to high-spin states, and the transition barrier becomes lower for thinner 2D samples due to surface-localized defects. These findings have important implications for realizing groundbreaking magneto-optic functions and devices in coordinated metals' 2D solids.
Article
Materials Science, Multidisciplinary
Ziwei Yang, Mingkai Liu, Andrei Komar, Lei Xu, Dragomir N. Neshev
Summary: Pure phase modulation of light is crucial for various optical devices. Tunable metasurfaces provide an alternative solution for achieving this goal. Optical anisotropy of surrounding material can enable phase-only tuning of optical metasurfaces.
ADVANCED OPTICAL MATERIALS
(2022)
Review
Optics
Dragomir N. Neshev, Andrey E. Miroshnichenko
Summary: Optical metasurfaces, which are subwavelength-patterned surfaces that strongly interact with light, have been a popular research topic for over a decade. They offer advantages such as miniaturization of optical elements, novel functionalities for processing hidden light modalities, and the ability to adjust their properties as needed. Numerous applications focused on smart vision have emerged, envisioning the integration of meta-optical devices in robotic systems. The field is now experiencing significant industry demand, which is shaping the challenges and research directions. This review provides an overview of the application focus and discusses current challenges and future research frontiers in the field.
Article
Optics
Daniel Repp, Angela Barreda, Francesco Vitale, Isabelle Staude, Ulf Peschel, Carsten Ronning, Thomas Pertsch
Summary: Semiconductor nanowire lasers can have their lasing threshold modified by their environment, and using metallic substrates can access low-volume Surface-Plasmon-Polariton (SPP) modes and describe mode competition in nanowire lasers. The study found that an aluminum substrate decreases the lasing threshold for ZnO nanowire lasers, while a silver substrate increases the threshold compared to a dielectric substrate. These findings allow for predictions about the interaction between planar metals and semiconductor nanowires, guiding future improvements in highly-integrated laser sources.
Article
Materials Science, Multidisciplinary
Andrea Tognazzi, Marco Gandolfi, Bohan Li, Gina Ambrosio, Paolo Franceschini, Rocio Camacho-Morales, Alfonso Carmelo Cino, Camilla Baratto, Domenico de Ceglia, Dragomir Neshev, Costantino De Angelis
Summary: This article investigates the opto-thermal properties of plane multilayered structures with phase-change materials for optical limiters. The results show that such structures can act as self-activating devices by utilizing light-to-heat conversion to induce a phase change. This opens up new opportunities for multi-layer self-activating optical limiters.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Materials Science, Multidisciplinary
Chengjun Zou, Purushottam Poudel, Sarah L. Walden, Katsuya Tanaka, Alexander Minovich, Thomas Pertsch, Felix H. Schacher, Isabelle Staude
Summary: Tunability is crucial for practical applications of high-efficiency metasurface-based nanophotonic devices and systems. The research in this area has made significant progress in terms of tuning mechanisms, speed, and active functionalities. However, most of the demonstrated works are based on a single type of physical stimulus, which limits the modulation range and design options of the metadevices. This article experimentally demonstrates that multi-responsive metasurfaces can be achieved by combining asymmetric, highly resonant metasurfaces with multi-responsive polymeric materials, providing new design freedom for multifunctional metadevices.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Benedikt Zerulla, Ramakrishna Venkitakrishnan, Dominik Beutel, Marjan Krstic, Christof Holzer, Carsten Rockstuhl, Ivan Fernandez-Corbaton
Summary: This article introduces a homogenization method based on the effective transition (T-) matrix, which allows for the computation of the response of arbitrarily shaped volumetric patchworks of structured molecular materials and metamaterials.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Optics
Bohan Li, Rocio Camacho-Morales, Neuton Li, Andrea Tognazzi, Marco Gandolfi, Domenico de Ceglia, Costantino De Angelis, Andrey A. Sukhorukov, Dragomir N. Neshev
Summary: By optimizing the nanostructured VO2 material, researchers have successfully improved its light transmission modulation to 0.73, which is twice the previous achieved modulation value. This research provides new opportunities for the application of VO2 materials.
PHOTONICS RESEARCH
(2023)
Article
Optics
Yunus Denizhan Sirmaci, Angela Barreda Gomez, Thomas Pertsch, Jens H. Schmid, Pavel Cheben, Isabelle Staude
Summary: The paper proposes and demonstrates a novel silicon nanophotonic waveguide consisting of a chain of resonantly forward scattering nanoparticles with spectrally overlapping electric and magnetic dipolar Mie-type resonances. The propagation loss of the meta-waveguides in the telecom spectral range is as low as 0.4 dB mm(-1), surpassing the current record for Mie-resonant waveguides by more than an order of magnitude. The meta-waveguides also support a negative group index over a broad spectral range and exhibit regions of vanishing and anomalous dispersion within the transmission band. Furthermore, compact resonance-protected waveguide bends and efficient splitters can be implemented within just 320 nm propagation length.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Khosro Zangeneh Kamali, Lei Xu, Nikita Gagrani, Hark Hoe Tan, Chennupati Jagadish, Andrey Miroshnichenko, Dragomir Neshev, Mohsen Rahmani
Summary: Metasurfaces with dynamic tunability in their optical behaviour are highly desired for various applications. In this study, we demonstrate electrically tunable metasurfaces driven by thermo-optic effect and flash-heating in silicon. The device allows for video frame rate optical switching over multiple pixels and is compatible with modern electronic display technologies. It shows advantages such as large modulation depth, low optical loss, low input voltage requirement, and high switching speed.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Multidisciplinary Sciences
Xuchen Wang, Mohammad Sajjad Mirmoosa, Viktar S. Asadchy, Carsten Rockstuhl, Shanhui Fan, Sergei A. Tretyakov
Summary: Photonic time crystals are artificial materials with spatially uniform but temporally varying electromagnetic properties. This study extends the concept of photonic time crystals to two-dimensional artificial structures called metasurfaces. By designing a microwave metasurface, the researchers confirmed the existence of momentum bandgaps and exponential wave amplification, demonstrating the potential of metasurfaces as a material platform for emerging photonic space-time crystals and for amplifying surface-wave signals in wireless communications.
Article
Optics
L. Kuhn, T. Repaen, C. Rockstuhl
Summary: The use of artificial neural networks in predicting electromagnetic fields has been limited by domain size and object shape restrictions. This study proposes the use of graph neural networks to solve Maxwell's equations, overcoming these limitations and providing size invariance and adaptability to any material shape or mesh structure.
Article
Nanoscience & Nanotechnology
Maryam Moradi, Isabelle Staude, Thomas Pertsch, Michael Jaeger, Ulrich S. Schubert
Summary: By utilizing a spin-coating-based sample fabrication procedure, we developed a gold-quantum dot hybrid system that exhibited reversible photoluminescence switching in response to redox processes. The system relied on a nanometric thick polymer spacer layer that was redox-responsive, enabling attachment of the quantum dots to a gold film. The study demonstrated a reversible and reproducible 2.3 ± 0.6-fold photoluminescence intensity switching factor upon oxidation and reduction of the spacer layer.
ACS APPLIED NANO MATERIALS
(2023)
Article
Optics
Dominik Beutel, Ivan Fernandez-Corbaton, Carsten Rockstuhl
Summary: The evaluation of lattice sums is necessary for analyzing the interaction between objects on a lattice. In electromagnetic scattering scenarios involving arrays of particles forming metamaterials, metasurfaces, or photonic crystals, Ewald's method can improve the convergence of lattice sums. This study presents a derivation of exponentially convergent series for the solutions of the Helmholtz equation, specifically for different dimensional cases and involving the interaction of sublattices. The derived formulas are applicable to various multipolar orders and have been validated through comparison with direct computation of lattice sums.
Article
Chemistry, Multidisciplinary
Sebastian Klimmer, Giancarlo Soavi, Isabelle Staude, Angela Barreda
Summary: This study proposes a new hybrid platform to enhance the excitation and emission of dark excitons in transition metal dichalcogenides, offering distinct advantages for opto-electronic and valleytronic devices.
Article
Chemistry, Multidisciplinary
Benedikt Zerulla, Dominik Beutel, Christof Holzer, Ivan Fernandez-Corbaton, Carsten Rockstuhl, Marjan Krstic
Summary: This article introduces a novel multi-scale approach for simulating the nonlinear optical response of molecular materials. The approach combines ab initio quantum-chemical and classical Maxwell-scattering computations. By incorporating the first hyperpolarizability tensor computed with time-dependent density-functional theory into a multi-scattering formalism, the optical interaction between neighboring molecules is considered. The approach is versatile and accurate, making it suitable for exploring nonlinear photonic molecular materials in structured photonic environments in the future.
ADVANCED MATERIALS
(2023)
