Article
Physics, Applied
Shunlin Huang, Peng Wang, Xiong Shen, Jun Liu, Ruxin Li
Summary: By using cascaded four-wave mixing, a multicolor concentric ultrafast vortex beam with controllable orbital angular momentum (OAM) has been generated. This beam can be manipulated simultaneously in temporal, spatial, and spectral domains as well as OAM state, enabling a wide range of special applications including pump-probe experiments, microparticle manipulation, and optical communication.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Li Zhang, Xiao Wu, Zhenzhong Hao, Rui Ma, Feng Gao, Fang Bo, Guoquan Zhang, Jingjun Xu
Summary: This Letter reports the fabrication of lithium niobate-on-insulator ridge waveguides with generalized quasiperiodic poled superlattices using electric field polarization technique and microfabrication techniques. The efficient second-harmonic and cascaded third-harmonic signals were observed in the same device, with normalized conversion efficiency of 1735% W-1 cm-2 and 0.41% W-2 cm-4, respectively. This work opens a new direction for nonlinear integrated photonics based on lithium niobate thin film.
Article
Chemistry, Multidisciplinary
Yang Liu, Ya-Ping Gong, Shining Geng, Mei-Ling Feng, Despoina Manidaki, Zeyu Deng, Constantinos C. Stoumpos, Pieremanuele Canepa, Zewen Xiao, Wei-Xiong Zhang, Lingling Mao
Summary: Ge-based hybrid perovskite materials show great potential for second harmonic generation (SHG). Newly discovered Ge-based bromide perovskite materials exhibit tunable SHG responses and the high SHG efficiency is attributed to specific structural and theoretical factors.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Optics
Robertas Grigutis, Vytautas Jukna, Gintaras Tamosauskas, Audrius Dubietis
Summary: High repetition rate femtosecond filaments in transparent solids generate conical third harmonic generation through the reorganization of materials, creating periodic volume nanogratings. We demonstrate conical third harmonic generation in fused silica using tunable femtosecond pulses. The measurement of third harmonic cone angles supports the noncollinear phase-matching scenario involving a reciprocal lattice vector of the filament-inscribed nanograting. The nanograting provides a wide phase-matching bandwidth, as evidenced by angle-resolved spectra of broadband conical third harmonic emission.
Article
Optics
Olivier Bernard, Andrea Kraxner, Assim Boukhayma, Jeff A. Squier, Christian Enz, Yves Bellouard
Summary: In the last two decades, ultrafast in-volume laser-based processing of transparent materials has become a key 3D-printing method. However, determining suitable laser process parameters for a given substrate is still a time-consuming task. This study introduces a method using in situ full-field third-harmonic generation (THG) microscopy to quickly identify the entire processing space and extract incubation laws governing the laser exposure process, enabling accelerated implementations of laser processes and closed-loop process control.
Article
Multidisciplinary Sciences
Palas Roy, Wesley R. Browne, Ben L. Feringa, Stephen R. Meech
Summary: Controlling molecular translation at the nanoscale is a key objective for development of synthetic molecular machines. Recently developed third generation photochemically driven molecular motors (3GMs) offer the possibility of converting light energy into translational motion. Detailed understanding of their excited state dynamics facilitates the development of 3GMs.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Wei Li, Yunpeng Ma, Tianyi Feng, Ziwan Du, Yixuan Liu, Sergei Kalinin, Jing-Feng Li, Qian Li
Summary: Understanding symmetry breaking in ferroelectric materials is crucial for manipulating their functional properties. We developed a spectral imaging method using optical second harmonic generation to investigate the mechanisms behind crystallographic symmetry breaking. By studying (K,Na)NbO3 single crystals, we demonstrated the method's ability to analyze domain variants and their thermal evolution across phase transitions. The method can be extended to other ferroelectric materials with potential enhancements.
JOURNAL OF MATERIOMICS
(2023)
Article
Optics
Patrick Mutter, Kjell Martin Molster, Andrius Zukauskas, Valdas Pasiskevicius, Carlota Canalias
Summary: We demonstrate first-order quasi-phase-matched backward second-harmonic generation with an efficiency of 18.7%, which represents a significant improvement compared to earlier experiments. The efficient backward second-harmonic generation is achieved in bulk periodically poled Rb:KTiOPO4 with a poling period of 317 nm. By investigating the properties of backward second-harmonic generation, such as spectral bandwidth, temperature tuning, and temperature bandwidth, we compare them with co-propagating second harmonic generation and explore the potential applications.
Article
Optics
Henri Pesonen, Juha-Matti Huusko, Xiaorun Zang, Ari T. Friberg, Jari Turunen, Tero Setala
Summary: This paper investigates the effects of nonlinear interaction on the spectral and temporal coherence of Gaussian Schell-model (GSM) pulses passing through a nonlinear optical crystal. The results show that the coherence of the fundamental and second-harmonic pulses may deviate from the theoretical model, and the coherence of the second-harmonic wave decreases with increasing intensity of the fundamental beam. Additionally, the transmitted second-harmonic wave may exhibit a double-peaked intensity distribution due to the partial coherence of the incident GSM field.
Article
Physics, Condensed Matter
M. Tshipa
Summary: In this study, second harmonic generation (SHG) and third harmonic generation (THG) in quantum dots with cylindrical geometry were investigated by solving the Schroedinger equation within the effective mass approximation. Results show that peaks of SHG and THG coefficients in different cylindrical quantum dot shapes occur at different photon energies, with peak energy increasing in the order of solid cylinders, convex cones, linear cones, and concave cones. The study also discussed potential applications and differences in energy separation for conical quantum dots compared to solid cylindrical quantum dots.
SUPERLATTICES AND MICROSTRUCTURES
(2021)
Article
Optics
Shing Yiu Fu, Kareem J. Garriga Francis, Mervin Lim Pac Chong, E. Yiwen, X. -C. Zhang
Summary: We investigate the processes behind enhanced second harmonic wave generated from a laser-induced air plasma, focusing on the temporal dynamics of the frequency conversion processes, and the polarization of the emitted second harmonic beam. The efficiency of second harmonic generation is found to be consistently high within a sub-picosecond time window, regardless of the duration of the fundamental pulse. The polarization of the second harmonic field is complex and dependent on the polarization of both input fundamental beams when using an orthogonal pump-probe configuration.
Article
Multidisciplinary Sciences
Kunze Lu, Manlin Luo, Weibo Gao, Qi Jie Wang, Hao Sun, Donguk Nam
Summary: Despite the centrosymmetric nature of graphene, strain engineering can be used to manipulate its lattice arrangement and induce sublattice polarization, activating second harmonic generation (SHG). The SHG signal in strained graphene is boosted 50-fold at low temperatures due to resonant transitions between strain-induced pseudo-Landau levels. The second-order susceptibility of strained graphene exceeds that of hexagonal boron nitride with intrinsic broken inversion symmetry, opening up possibilities for high-efficiency nonlinear devices.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Tao He, Yizhu Zhang, J. J. Zhao, Xincheng Wang, Zhenjie Shen, Zuanming Jin, Tian-Min Yan, Yuhai Jiang
Summary: The study investigates the mechanism of low-order harmonic generation induced by a strong laser field, with a focus on the third harmonic generation. It is found that the third harmonic generation is strongly suppressed in counter-rotating bi-chromatic laser fields, and the quantum-mechanical treatment provides a better explanation for experimental observations compared to the semi-classical photocurrent model. The work suggests that overlapping in continuum states via different quantum paths of a single electron plays a role in low-order harmonic generation under elliptical bi-chromatic laser fields.
Article
Multidisciplinary Sciences
In Hyung Baek, Hyun Woo Kim, Hyeon Sang Bark, Kyu-Ha Jang, Sunjeong Park, Junho Shin, Young Chan Kim, Mihye Kim, Key Young Oang, Kitae Lee, Fabian Rotermund, Nikolay A. Vinokurov, Young Uk Jeong
Summary: Utilizing relativistic electrons and subwavelength slit waveguide, a real-time THz oscilloscope was demonstrated for time-frozen visualization of a THz optical wave.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Teng Zheng, Marcin Runowski, Przemyslaw Wozny, Boleslaw Barszcz, Stefan Lis, Mauricio Vega, Jaime Llanos, Kevin Soler-Carracedo, Inocencio R. Martin
Summary: The authors synthesized a series of optically active BaTiO3: Er3+, Yb3+ perovskite materials through a chemical engineering process and investigated their temperature-dependent nonlinear optical responses. They found that the nonlinear optical thermometry approach achieved superior thermal sensitivity and excellent temperature resolution, and the combination with upconversion luminescence allowed rapid and precise phase transition detection.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Optics
Joana Duarte, Aura Ines Gonzalez, Remy Cassin, Rana Nicolas, Maria Kholodstova, Willem Boutu, Marta Fajardo, Hamed Merdji
Summary: This paper introduces a method for single-shot measurement of spatial coherence of a light source using a specific arrangement of a two-dimensional non-redundant array of apertures. This method eliminates the need for parallel measurement of beam intensity and is robust against beam-pointing instabilities. Experimental validation demonstrates the strong robustness of the method in different regimes.
Article
Multidisciplinary Sciences
Peter W. Hatfield, Jim A. Gaffney, Gemma J. Anderson, Suzanne Ali, Luca Antonelli, Suzan Basegmez du Pree, Jonathan Citrin, Marta Fajardo, Patrick Knapp, Brendan Kettle, Bogdan Kustowski, Michael J. MacDonald, Derek Mariscal, Madison E. Martin, Taisuke Nagayama, Charlotte A. J. Palmer, J. Luc Peterson, Steven Rose, J. J. Ruby, Carl Shneider, Matt J. Streeter, Will Trickey, Ben Williams
Summary: High-energy-density physics studies matter at extremely high temperatures and densities, producing highly nonlinear plasmas. Understanding these extreme systems is challenging, but machine learning models and data-driven methods are reshaping exploration in this field.
Article
Physics, Applied
M. Hussain, S. Kaassamani, T. Auguste, W. Boutu, D. Gauthier, M. Kholodtsova, J. -T. Gomes, L. Lavoute, D. Gaponov, N. Ducros, S. Fevrier, R. Nicolas, T. Imran, P. Zeitoun, G. O. Williams, M. Fajardo, H. Merdji
Summary: By comparing two materials with distinct optical properties, silicon and zinc oxide, this study investigates the macroscopic effects on high harmonic generation (HHG) in crystals. It reveals spectral shifts in the generated harmonics due to non-linear propagation effects of the driving pulse, providing insights into the impact of spectral modulation of the driving field on HHG.
APPLIED PHYSICS LETTERS
(2021)
Article
Optics
Patricia Estrela, Ermelinda Macoas, Gareth Williams, Mukhtar Hussain, Marta Fajardo
Summary: The study demonstrates that lithium fluoride (LiF) crystals can be used as detectors for HHG XUV, showing high performance and potential for near-field imaging of complex objects in XUV sources generated from high harmonic generation in gases.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Optics
Elena Longo, Domenico Alj, Joost Batenburg, Ombeline de la Rochefoucauld, Charlotte Herzog, Imke Greving, Ying Li, Mikhail Lyubomirskiy, Ken Vidar Falch, Patricia Estrela, Silja Flenner, Nicola Vigano, Marta Fajardo, Philippe Zeitoun
Summary: This study demonstrates the first use of a flexible plenoptic microscope operating with hard X-rays to computationally reconstruct images at different depths. The experimental results confirm the potential of quasi-3D X-ray imaging without sample rotation, with high spatial resolution.
Article
Optics
Sven Froehlich, Xu Liu, Aimrane Hamdou, Alric Meunier, Mukhtar Hussain, Mathieu Carole, Shatha Kaassamani, Marie Froidevaux, Laure Lavoute, Dmitry Gaponov, Nicolas Ducros, Sebastien Fevrier, Philippe Zeitoun, Milutin Kovacev, Marta Fajardo, Willem Boutu, David Gauthier, Hamed Merdji
Summary: We demonstrate a self-probing method for imaging an object using semiconductor high-harmonic generation. Combining ptychography measurements with nanopatterned crystals, we are able to obtain structural information of the object. This innovative approach has the potential to revolutionize nanoscale imaging of photonic and electronic devices.
Review
Pediatrics
Steven D. Criss, Shravya Kakulamarri, Raylin F. Xu, Maya Fajardo, Tamra Keeney, Dorothy W. Tolchin, Collin J. May
Summary: Through literature review, it was found that there are significant issues and barriers in clinical and perioperative management, therapy interventions, participation in exercise and social play, sensory management and accommodations, caregiver/parent training and involvement, healthcare needs and barriers, and utilization of technology for autistic patients in orthopaedic care. However, there are no studies directly assessing the patient experience of autistic individuals in clinical orthopaedic settings, indicating a need for further research.
Article
Optics
Mukhtar Hussain, Fernando Lima, Willem Boutu, Hamed Merdji, Marta Fajardo, Gareth O. Williams
Summary: The surge of interest in nonperturbative high-harmonic generation in solids is due to the appeal of compact solid-state extreme ultraviolet sources and the possibility of understanding material properties through high-harmonic generation response to strong fields. The research shows that third-harmonic generation using specific parameters exhibits nonperturbative behavior in a wide-band-gap insulator, but reverts to perturbative behavior when dopants are introduced.
