Article
Optics
Yuki Saito, Takashi Asano, Susumu Noda, Yasushi Takahashi
Summary: A Raman nanocavity laser can emit light into free space and waveguides. By adding photonic mirrors to the waveguides, the edge emission of the nanocavity laser can be significantly enhanced. Experimental results show that devices with mirrors have 4.3 times stronger edge emission on average. Control of the round-trip phase shift and an increase in the quality factors of the nanocavity are important for further enhancement.
Article
Chemistry, Physical
Pawel Karpinski, Lech Sznitko, Monika Wisniewska-Belej, Andrzej Miniewicz, Tomasz J. Antosiewicz
Summary: Light can be guided without diffraction using optical fibers and waveguides, or by creating spatial solitons in optically nonlinear media. This study introduces a new approach where a self-stabilized optical waveguide is formed by a chain of polymer microparticles and propelled through water. The properties of the waveguide depend on the diameter-to-wavelength ratio.
Article
Chemistry, Physical
Xu Yu, Bin Liu, Xiuhong Pan, Hongyu Zhang
Summary: In this study, an organic crystal compound DPFP with potential value as an active optical waveguide was developed. The crystal exhibited a soft and elastic nature, as well as a suitable emission wavelength. Furthermore, the crystal underwent a crystalline transition process and retained its elastic and emission properties, making it a promising optical waveguide device.
Article
Materials Science, Multidisciplinary
Lei Zheng, Nils Keppler, Huajun Zhang, Peter Behrens, Bernhard Roth
Summary: An easily fabricated gas sensor based on planar polymer optical waveguides with an integrated zeolite imidazole framework-8 (ZIF-8) thin film is presented for carbon dioxide detection and sensing. The sensor exhibits high sensitivity, rapid response, and excellent reversibility, showing potential for developing flexible on-chip gas sensors in an inexpensive and reproducible manner.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Multidisciplinary Sciences
Ileana-Cristina Benea-Chelmus, Maryna L. Meretska, Delwin L. Elder, Michele Tamagnone, Larry R. Dalton, Federico Capasso
Summary: Researchers have developed an SLM device based on organic electro-optic materials that can manipulate individual pixel properties at speeds up to 50 MHz, offering potential applications in imaging and spectroscopy. These materials exhibit high nonlinearity, custom-tailored nonlinear tensors at the nanoscale, and have broad applications in active free-space optics, such as remote monitoring and virtual or augmented reality. The compatibility with compact laser diodes, achieved millimeter size, and low power consumption make them suitable for laser ranging and reconfigurable optics.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Themistoklis Chrysostomidis, Ioannis Roumpos, Konstantinos Fotiadis, Jinfeng Mu, Athanasios Manolis, Christos Vagionas, Meindert Dijkstra, Sonia Garcia Blanco, Theonitsa Alexoudi, Konstantinos Vyrsokinos
Summary: This paper presents a comprehensive study on the high-speed wavelength-division multiplexing (WDM) transmission capabilities of a monolithically integrated Al2O3:Er3+ spiral waveguide amplifier. The results demonstrate high-performance transmission at different data rates and without the need for digital signal processing (DSP) applied on the transmitter or receiver side.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Muhammad Usman, Jehan Akbar, Rashid Khan, Bakht Amin Bacha
Summary: This study doped a four-level atomic medium into a silica crystal slab and achieved atom localization and generation of waveguide channels by varying the Bragg angle. The generated waveguide channels and particle traps can be used for guiding electromagnetic radiations and trapping quantum particles, which have important implications for optical trapping and data storage.
Article
Multidisciplinary Sciences
Panagiota Perlepe, Itziar Oyarzabal, Laura Voigt, Mariusz Kubus, Daniel N. Woodruff, Sebastian E. Reyes-Lillo, Michael L. Aubrey, Philippe Negrier, Mathieu Rouzieres, Fabrice Wilhelm, Andrei Rogalev, Jeffrey B. Neaton, Jeffrey R. Long, Corine Mathoniere, Baptiste Vignolle, Kasper S. Pedersen, Rodolphe Clerac
Summary: The electronic synergy between metal ions and organic linkers is essential for engineering molecule-based materials with high electrical conductivity and metallicity. This study demonstrates the crucial role of metal ions in tuning the electronic properties of such materials, leading to high room-temperature conductivity and the existence of a correlated metal state.
NATURE COMMUNICATIONS
(2022)
Article
Computer Science, Information Systems
Changkun Feng, Danni Liu, Peiren Ni, Hui Li, Lishuang Feng
Summary: This study proposed a method to suppress the back-reflection of the end face of silicon nitride waveguide resonator and verified the simulation results through experiments. The back-reflection can be effectively reduced by oblique cutting the end face by 15 degrees, laying the foundation for improving the performance of RIOG based on Si3N4 waveguide resonator.
Article
Optics
Xianze Meng, Kang Wang, Xieqiu Yu, Yingying Ding, Yushan Zeng, Ting Lin, Renyu Feng, Wenkai Li, Yi Liu, Ye Tian, Liwei Song
Summary: We propose a scheme for intense terahertz generation from DSTMS crystal driven by a high-power optical parametric chirped pulse amplifier. The generated terahertz energy is up to 175 μJ with a peak electric field of 17 MV/cm. This study demonstrates the relationship between terahertz energy, conversion efficiency, and pump fluence, providing a powerful driving light source for strong-field terahertz pump-probe experimentation.
Article
Optics
Zhengtao Zha, Qianshu Zhang
Summary: This study presents a structure utilizing a liquid-crystal (LC) core optical waveguide for switchable spatial control of linearly polarized light. Both the left and right isotropic claddings in the waveguide have refractive indices between the two principal-axis indices of the nematic liquid crystal (NLC). Numerical simulations demonstrate that this structure can function as a transmission mode or attenuator by controlling the applied voltage, regardless of the initial excitation being transverse electric (TE) or transverse magnetic (TM) linearly polarized light. Additionally, this design can be used as an integrated optical polarizer, allowing only one type of linearly polarized light to pass through the core zone of the NLC optical waveguide.
CURRENT OPTICS AND PHOTONICS
(2023)
Article
Optics
Hongru Zhang, Guofang Fan, Shi Li, Gaoshan Jing, Yuan Li, Zhiping Zhang
Summary: In this paper, an optical waveguide microcantilever sensor with a dual-output waveguide readout is developed for obtaining a linear response to the deflection of the cantilever. The optical waveguide microcantilever sensor is characterized using the finite element method. A systematic and detailed discussion is presented on the design and unique results of the optical waveguide cantilever sensor with a dual-output waveguide. The study shows interesting and divergent results from general opinions, highlighting the trade-off between sensitivity, linearity, and operation range. These findings are valuable for optimizing the design of microcantilever sensors.
OPTICS COMMUNICATIONS
(2022)
Article
Computer Science, Information Systems
Hyuntai Kim
Summary: This paper introduces a metasurface interconnection method via attaching antiresonant waveguide, and proposes an inline optical transmission modulator by filling liquid crystal. Research verifies the capability of the antiresonant fiber and the good performance of the liquid crystal device.
Article
Computer Science, Information Systems
Sepideh Mohammadi Kouhini, Julian Hohmann, Sreelal Mavanchery Mana, Peter Hellwig, Dominic Schulz, Anagnostis Paraskevopoulos, Ronald Freund, Volker Jungnickel
Summary: LiFi, also known as networked optical wireless communication, can offload mobile data traffic from radio spectrum to optical spectrum. This paper presents real-time communication over an all-optical fixed-wireless LiFi link based on the distributed multiple-input multiple-output concept. Two modes, spatial diversity and spatial multiplexing, are studied for the operation of the link. Results show that selection combining is highly effective and a dynamic switching between spatial diversity and spatial multiplexing is a practical approach.
Article
Physics, Multidisciplinary
Riccardo Pennetta, Martin Blaha, Aisling Johnson, Daniel Lechner, Philipp Schneeweiss, Juergen Volz, Arno Rauschenbeutel
Summary: This article experimentally and theoretically investigates collective radiative effects in an ensemble of cold atoms coupled to a single-mode optical nanofiber. The results reveal the microscopic dynamics of the system and the progressive growth of collective interactions between atoms and a guided photon. The experimental measurements demonstrate superradiant decays in the forward-propagating guided mode and the progressive growth of the collective response of the atomic ensemble.
PHYSICAL REVIEW LETTERS
(2022)
Review
Chemistry, Multidisciplinary
Peter R. Spackman, Arnaud Grosjean, Sajesh P. Thomas, Durga Prasad Karothu, Pance Naumov, Mark A. Spackman
Summary: This review provides a critical and comprehensive overview of experimental measurements of complete elastic constant tensors for molecular crystals, comparing them with calculations from different methods. The comparisons identify outliers and aim to stimulate further research correlating mechanical properties with crystal structure.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Chemistry, Multidisciplinary
Durga Prasad Karothu, Jad Mahmoud Halabi, Ejaz Ahmed, Rodrigo Ferreira, Peter R. Spackman, Mark A. Spackman, Pance Naumov
Summary: This paper summarizes the mechanical properties of organic crystals over the past three decades and establishes a global mechanical property profile. Organic crystals occupy a specific region in the mechanical property-density space and can be used to predict and identify mechanically robust organic crystal materials.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Ejaz Ahmed, Durga Prasad Karothu, Ahmed Slimani, Jad Mahmoud Halabi, Ibrahim Tahir, Kevin Quiros Canales, Pance Naumov
Summary: This study reports the remarkably rapid lattice switching of molecular martensitic materials, which exceeds other phase transitions by several orders of magnitude. These materials have the advantages of rapid response and lightweight, making them prospective substitutes for ultrafast and clean energy transduction.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Marieh B. Al-Handawi, Ghada Dushaq, Patrick Commins, Durga Prasad Karothu, Mahmoud Rasras, Luca Catalano, Pance Naumov
Summary: This study reports the autonomous self-healing capability of centimeter-size single crystals of methylammonium lead(II) iodide (MAPbI(3)) at ambient temperature, with remarkable recovery of their optoelectronic properties. This discovery overcomes the challenges of chemical stability and mechanical robustness, providing a new strategy for the development of durable and stable optoelectronic devices based on single crystals of hybrid perovskites.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Durga Prasad Karothu, Rodrigo Ferreira, Ghada Dushaq, Ejaz Ahmed, Luca Catalano, Jad Mahmoud Halabi, Zainab Alhaddad, Ibrahim Tahir, Liang Li, Sharmarke Mohamed, Mahmoud Rasras, Pance Naumov
Summary: This study reports on an organic actuating material with exceptionally large stroke that can convert energy into work at room temperature. The material outperforms electric cylinders, ceramic piezoactuators, and electrostatic actuators in terms of maximum force density and has work capacity comparable to thermal actuators. The study demonstrates the untapped potential of ionic organic crystals for various applications.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Soha Yousuf, Jad Mahmoud Halabi, Ibrahim Tahir, Ejaz Ahmed, Rachid Rezgui, Liang Li, Praveen Laws, Mohammed Daqaq, Pance Naumov
Summary: In this study, a flexible, thin and optically transmissive organic crystal with a high aspect ratio was used as an active flow sensor. The crystal, stamped with fluorescent dye, bends when exposed to gas flow and laser, acting as an optical flow (hair) sensor with low detection limit (approximately 1.578 m s(-1)) and fast response time (approximately 2.70 s). Finite element analysis was used to model the air-flow-induced crystal deformation and flow dynamics response. This prototype crystal hair-like sensor, with its simple design, lightweight and mechanical robustness, opens up possibilities for a new class of sensing devices ranging from wearable electronics to aeronautics.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Nanoscience & Nanotechnology
Haofan Yang, Chao Li, Tao Liu, Thomas Fellowes, Samantha Y. Y. Chong, Luca Catalano, Mounib Bahri, Weiwei Zhang, Yongjie Xu, Lunjie Liu, Wei Zhao, Adrian M. Gardner, Rob Clowes, Nigel D. Browning, Xiaobo Li, Alexander J. Cowan, Andrew I. Cooper
Summary: Molecular packing controls optoelectronic properties in organic molecular nanomaterials. A donor-acceptor molecule assembles with different molecular packing to form photocatalysts which selectively produce either H-2 or H2O2, depending on the aggregate structure, a proof-of-concept of photoactivity polymorphism.
NATURE NANOTECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Durga Prasad Karothu, Zainab Alhaddad, Christian R. Goeb, Christian J. Schuermann, Robert Buecker, Pance Naumov
Summary: In this study, the crystal structure of Levocetirizine dihydrochloride was determined directly from crystalline powders extracted from commercially available tablets using 3D electron diffraction (3D ED)/MicroED technique. The results highlight the immense potential of 3D ED/MicroED for structure elucidation of components of microcrystalline mixtures, eliminating the need for growing large-size single crystals and using complementary analytical techniques, which is important for identification and primary structural characterization.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Maor Asher, Marco Bardini, Luca Catalano, Remy Jouclas, Guillaume Schweicher, Jie Liu, Roman Korobko, Adi Cohen, Yves Geerts, David Beljonne, Omer Yaffe
Summary: We use temperature-dependent low-frequency Raman measurements and first-principles calculations to investigate the order-disorder phase transition of ditBu-BTBT crystals. By analyzing the Raman peaks and their dependence on temperature, we identify the lattice normal modes associated with the phase transition and propose a model to explain the observed behaviors. Our findings suggest that side-chain engineering can be used to control polymorphism in amphidynamic crystals by manipulating lattice interactions.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Jad Mahmoud Halabi, Marieh B. B. Al-Handawi, Rodrigo Ceballos, Pance Naumov
Summary: Despite decades of research, shape-shifting molecular crystals have not yet become a primary class of actuating materials. To develop and commercialize these materials, it is essential to build an extensive knowledge base, which is currently scattered and disjointed for molecular crystal actuators. Using machine learning, we identify inherent features and structure-function relationships that impact the mechanical response of molecular crystal actuators. Our model considers different crystal properties and deciphers their combined effects on actuation performance, inviting interdisciplinary expertise to translate basic research into technology-based development.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Anton V. Savchenkov, Ejaz Ahmed, Durga Prasad Karothu, Pance Naumov
Summary: The study found no definite correlation between noncovalent interactions in crystals and their elastic or plastic properties. All studied crystals contained numerous hydrogen bonds, contributing to a significant portion (ranging from 10% to 75%, with an average of approximately 42%) of the overall noncovalent interactions. Several outliers were identified, which were attributed to unusual noncovalent contacts or erroneous crystal structures.
CRYSTAL GROWTH & DESIGN
(2023)
Review
Chemistry, Multidisciplinary
Wegood M. Awad, Daniel W. Davies, Daichi Kitagawa, Jad Mahmoud Halabi, Marieh B. Al-Handawi, Ibrahim Tahir, Fei Tong, Gonzalo Campillo-Alvarado, Alexander G. Shtukenberg, Tamador Alkhidir, Yuki Hagiwara, Mubarak Almehairbi, Linfeng Lan, Shodai Hasebe, Durga Prasad Karothu, Sharmarke Mohamed, Hideko Koshima, Seiya Kobatake, Ying Diao, Rajadurai Chandrasekar, Hongyu Zhang, Changquan Calvin Sun, Christopher Bardeen, Rabih O. Al-Kaysi, Bart Kahr, Pance Naumov
Summary: Molecular crystals have diverse physical properties and can be studied by responding to electric, magnetic, and light fields. The mechanical properties of molecular crystals enhance our understanding of weakly bound molecules under internal and external forces. The importance of mechanical properties to practical applications and the need for improvement in measurement techniques and conceptual tools are emphasized.
CHEMICAL SOCIETY REVIEWS
(2023)
