Article
Chemistry, Multidisciplinary
Yoonsoo Rho, SeokJae Yoo, Daniel B. Durham, DongJun Kang, Andrew M. Minor, Costas P. Grigoropoulos
Summary: Nonlinear optical response is a useful tool for studying the properties of materials, but its weak signal and limited reach make it difficult to probe deep-subwavelength-scale nonlinear optics. In this study, we propose a new method using an SHG-active plasmonic nanotip to achieve efficient second harmonic generation (SHG) nanoscopy. Our simulations suggest that enhancing the nonlinear response of the sample or suppressing the tip's response can lead to a high near-field SHG contrast, providing evidence of quantum mechanical nonlinear energy transfer. Furthermore, this technique can be used to study nanoscale corrosion and other physicochemical phenomena.
Article
Nanoscience & Nanotechnology
Hongkun Liu, Bingbing Zhang, Ling Li, Ying Wang
Summary: Deep-UV nonlinear optical (NLO) materials are crucial for demanding DUV laser applications, and the two synthesized fluoroaluminoborates exhibit NLO activity with short UV cutoff edges. Despite having the same fundamental structural units, their crystal structures and second harmonic generation (SHG) responses differ significantly due to the cation effect.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Qianting Xu, Youchao Liu, Qingchen Wu, Linxi Hou, Yanqiang Li, Lina Li, Zheshuai Lin, Sangen Zhao, Junhua Luo
Summary: A new chiral trithiocyanate compound, K-4(HC3N3S3)(2)·H2O, is reported to have strong second-harmonic generation and high birefringence in comparison with the commercial NLO crystal beta-BaB2O4. The enhanced optical properties of K-4(HC3N3S3)(2)·H2O are attributed to the highly pi-conjugated [HC3N3S3](2-) rings.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Physical
Hong-Xin Tang, Rui-Biao Fu, Zu-Ju Ma, Xin-Tao Wu
Summary: A new tungsten oxyfluoride crystal, K2(H2O)WO3F2, with O/F orientationally order has been successfully synthesized. The distorted [WO4F2] octahedra in this crystal are induced by trigonal [K2(H2O)]2+ motifs into an oriented arrangement. K2(H2O)WO3F2 exhibits the strongest phase-matching SHG response and the highest laser damage threshold among reported transition-metal oxyfluorides, which is attributed to the uniform alignment of the distorted [WO4F2] octahedra.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Optics
Junjun Ma, Fei Xie, Weijin Chen, Jiaxin Chen, Wei Wu, Wei Liu, Yuntian Chen, Wei Cai, Mengxin Ren, Jingjun Xu
Summary: LN metasurfaces with controllable SHG properties have been experimentally demonstrated, showing distinct enhancements for the SHG efficiency at Mie resonances. By changing geometric parameters and resonances of metasurfaces, authors manage to selectively boost the SHG efficiency at different wavelengths, paving the way for developing novel compact nonlinear light sources with high flexibility for applications like biosensing and optical communications.
LASER & PHOTONICS REVIEWS
(2021)
Article
Optics
Fatemeh Abtahi, Pallabi Paul, Sebastian Beer, Athira Kuppadakkath, Anton Pakhomov, Adriana Szeghalmi, Stefan Nolte, Frank Setzpfandt, Falk Eilenberger
Summary: Second-harmonic generation (SHG) is observed in periodic stacks of alternating, subwavelength dielectric layers due to the broken symmetry at the surface. The surface SHG is significantly enhanced by the large number of surfaces in these stacks. Experimental results on SiO2/TiO2 multilayer stacks grown by PEALD demonstrate substantial SHG under large angles of incidence, surpassing that of simple interfaces. The experimental results are in agreement with theoretical calculations.
Article
Optics
Marc Jankowski, Carsten Langrock, Boris Desiatov, Marko Loncar, M. M. Fejer
Summary: We propose a new approach to supercontinuum generation and carrier-envelope-offset detection based on saturated second-order nonlinear interactions in dispersion-engineered nanowaveguides. The technique developed here broadens the interacting harmonics by forming stable bifurcations of the pulse envelopes due to an interplay between phase-mismatch and pump depletion. The scaling laws suggest that future realization based on this approach could enable supercontinuum generation with orders of magnitude less energy than current state-of-the-art devices.
Article
Nanoscience & Nanotechnology
Jicheng Jin, Jian Lu, Bo Zhen
Summary: Second harmonic dipoles generated in a nonlinear photonic crystal slab can be completely nonradiative, resulting in no energy transfer from the fundamental frequency to the second harmonic even when the phase-matching condition is satisfied - a phenomenon known as resonance-forbidden second-harmonic generation. Through numerical simulation, two mechanisms for achieving this phenomenon have been identified: symmetry protection and parameter tuning. The finite-size effect and the topological origin of this phenomenon are also discussed.
Article
Materials Science, Multidisciplinary
Mengran Sun, Chunxiao Li, Jinlong Shi, Ming-Hsien Lee, Jiyong Yao
Summary: This study investigates the structural characteristics and nonlinear optical (NLO) properties of defect diamond-like (DL) MGa2Te4 (M = Zn, Cd) for the first time. The results show that MGa2Te4 (M = Zn, Cd) has moderate band gaps, strong second harmonic generation (SHG) intensities, and congruent-melting behavior. The lone-pair packets of Te ions in [GaTe4] units are found to be the main source of SHG responses. This work demonstrates the potential applications of these two defect DL tellurides in the mid- and far-infrared (MFIR) NLO field.
MATERIALS TODAY PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Shuang-Cheng Li, Zi-Long Geng, Rui-Biao Fu, Zu-Ju Ma, Xin-Tao Wu
Summary: Researchers have developed a new nonlinear optical (NLO) crystal, K(H2O)[KI][PbI(C4H4O4)], by modifying halide perovskite materials with a 2-methylmalonate group. This crystal exhibits a highly distorted [PbO4I2] polyhedron with large hyperpolarizability and prominent polarizability anisotropy, serving as a bifunctional unit. The oriented arrangement of the distorted [PbO4I2] polyhedrons leads to the effective superposition of their microscopic second-order nonlinear susceptibilities and enhances optical anisotropy. The crystal demonstrates a strong phase-matching second harmonic generation (SHG) response and a large birefringence, making it a promising candidate for high-performance NLO crystals.
SCRIPTA MATERIALIA
(2024)
Article
Materials Science, Multidisciplinary
Shi-Qi Li, Chuan He, Hongsheng Liu, Luneng Zhao, Xinlong Xu, Maodu Chen, Lu Wang, Jijun Zhao, Junfeng Gao
Summary: 2D materials, particularly Janus III chalcogenide monolayers, show great potential for nonlinear optical response, especially second harmonic generation (SHG). In this study, the SHG responses of nine Janus structures were systematically evaluated, and GaInTe2 exhibited extremely high out-of-plane SHG response, making it promising for ultraviolet NLO devices.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Multidisciplinary Sciences
Junhao Li, Guangwei Hu, Lina Shi, Nan He, Daqian Li, Qiuyu Shang, Qing Zhang, Huange Fu, Linlin Zhou, Wei Xiong, Jianguo Guan, Jian Wang, Sailing He, Lin Chen
Summary: The authors demonstrate broadband enhanced second-harmonic generation in patterned multilayer hyperbolic metamaterial arrays, overcoming the typical narrow spectral bandwidth limitation of these materials. This approach allows for rainbow light trapping and boosted nonlinear light-matter interactions, showing promise for various important technologies.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Ceramics
Qiuling Chen, Zhuangzhuang Li, Weihao Chen
Summary: This study investigates the manipulation of magnetic and Faraday rotation performance of heavy metal oxide diamagnetic glass using thermal poling electric field induced polarization and magnetization. The optimized thermal poling condition was determined to be 3 kV and 260 degrees C for 4 hours, resulting in enhanced second harmonic generation intensity, highest Verdet constant and improved diamagnetic susceptibility in the glass.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Multidisciplinary
Yu Chu, Hongshan Wang, Tudi Abutukadi, Zhi Li, Miriding Mutailipu, Xin Su, Zhihua Yang, Junjie Li, Shilie Pan
Summary: An unprecedented wide bandgap Hg-based IR NLO material Zn2HgP2S8 (ZHPS) with diamond-like structure is rationally designed and fabricated by a tetrahedron re-organization strategy with the aid of structure and property predictions. ZHPS exhibits a wide bandgap of 3.37 eV, which is the largest one among the reported Hg-based chalcogenide IR NLO materials and first breaks the 3.0 eV bandgap wall in this system, resulting in a high laser-induced damage threshold (LIDT) of similar to 2.2 x AgGaS2 (AGS). Meanwhile, it shows a large NLO response (1.1 x AGS), achieving a good balance between bandgap (>= 3.0 eV) and NLO effect (>= 1 x AGS) for an excellent IR NLO material.
Article
Optics
Gia Quyet Ngo, Emad Najafidehaghani, Ziyang Gan, Sara Khazaee, Malte Per Siems, Antony George, Erik P. Schartner, Stefan Nolte, Heike Ebendorff-Heidepriem, Thomas Pertsch, Alessandro Tuniz, Markus A. Schmidt, Ulf Peschel, Andrey Turchanin, Falk Eilenberger
Summary: This study demonstrates a method to achieve second-harmonic generation in functionalized optical fibers by directly growing highly nonlinear MoS2 monolayers on the fiber's core. The approach is scalable and can be generalized to other materials and waveguide systems.
