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
Biophysics
Young Chul Kim, Seung Won Jun, Yeong Hwan Ahn
Summary: Transition-metal dichalcogenides have extraordinary optical nonlinearities, making them potential candidates for advanced photonic applications. This study demonstrates the control of second-harmonic generation (SHG) in monolayer MoS2 by single-cell bacteria. The presence of bacteria induces anisotropic polarization responses in the SHG signal, which depends on the relative orientation of the bacteria and the MoS2 crystallographic direction. This research contributes to the monitoring of biomaterial strain and the label-free detection and identification of pathogens at the single-cell level.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Acoustics
Krishnadas Kanakambaran, Krishnan Balasubramaniam
Summary: Nonlinear ultrasonic techniques have attracted attention for their microstructural characterization capabilities, which can aid in early-stage defect detection and timely maintenance. By analyzing the amplitude of higher harmonics data, microstructural features like micro-cracks, precipitates, and dislocations can be accessed. Understanding the second harmonic modes can offer insights into the type of defect.
JOURNAL OF VIBRATION AND CONTROL
(2023)
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
Chemistry, Multidisciplinary
Junjun Shi, Xiaobo He, Wen Chen, Yang Li, Meng Kang, Yangjian Cai, Hongxing Xu
Summary: A dual cavity resonance scheme with remote excitation is developed to significantly enhance SHG in a nanobelt system. The enhancement is achieved through the cooperation of plasmonic and FP cavity modes.
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
Chemistry, Multidisciplinary
Young Chul Kim, Hoseong Yoo, Van Tu Nguyen, Soonil Lee, Ji-Yong Park, Yeong Hwan Ahn
Summary: In this study, a high-speed second-harmonic generation (SHG) imaging technique was used for in situ characterization of transition-metal dichalcogenide (TMD) monolayers and twisted bilayers. The SHG imaging allowed rapid identification of crystallinity, orientation, and homogeneity of the TMD with a speed of 1 frame/s. The research also revealed the SHG peak intensity and angles variation with the twist angle in twisted bilayer MoS2 under strong interlayer coupling, as well as the threshold behavior of laser-induced ablation in MoS2 monolayers and bilayers.
Article
Optics
Zelin Hao, Wenwei Liu, Zhancheng Li, Zhi Li, Guangzhou Geng, Yanchun Wang, Hua Cheng, Hammad Ahmed, Xianzhong Chen, Junjie Li, Jianguo Tian, Shuqi Chen
Summary: Metasurfaces have shown great potential in optical wave manipulation but face challenges in multidimensional manipulation of harmonic waves generated by nonlinear metasurfaces. This study presents an efficient design strategy based on the hydrodynamic model of free electron dynamics, allowing for full complex-amplitude modulation of second harmonic generation. The proposed nonlinear metasurfaces demonstrate spin-selective SHG optical vortices with independent topological charges, opening up new possibilities for nonlinear metasurface applications in optical information and multifunctional integration.
LASER & PHOTONICS REVIEWS
(2021)
Article
Materials Science, Multidisciplinary
Rui Ma, Duncan S. Sutherland, Yumeng Shi
Summary: Transition metal dichalcogenides (TMD), with outstanding optical characteristics and an absence of crystal inversion symmetry, are frequently used in studies of nonlinear optics (NLO) for harmonic generation. By fabricating TMD into heterostructures to enhance and manipulate the response, the performance in harmonic generation has been improved. The focus on heterostructure studies to enhance and manipulate the response represents core issues for devices and applications.
Article
Optics
Morteza Hajati, Mojtaba Gandomkar, Arash Karimkhani
Summary: We propose a microring resonator with BRW capable of achieving optical second-harmonic generation. Numerical simulations are used to suggest a comprehensive design procedure for the microring resonator and a precise thermo-optic tuning method. The designed structure can be switched to adjacent working wavelengths by thermal tuning and microrings with different radii can be designed on the same wafer for investigation.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Guan Gui, Nathan J. Brooks, Henry C. Kapteyn, Margaret M. Murnane, Chen-Ting Liao
Summary: The study observes the second-harmonic spatiotemporal orbital angular momentum of an optical pulse and reveals the conservation of topological charge during frequency doubling. The experiment suggests a general nonlinear scaling rule for ST-OAM, analogous to conventional OAM of light, and demonstrates that the topology of a second-harmonic ST-OAM pulse can be modified by complex spatiotemporal astigmatism.
Article
Chemistry, Physical
Jiaxing Du, Jianwei Shi, Chun Li, Qiuyu Shang, Xinfeng Liu, Yuan Huang, Qing Zhang
Summary: Researchers demonstrated a directional second harmonic generation (SHG) amplifier formed by MoS2/WS2 monolayer heterostructures, achieving significant enhancement of SHG and improved radiation angle, attributed to the excitation and emission field concentration induced by a vertical Fabry-Perot microcavity.
Article
Optics
Alexander W. A. Murphy, Zichen Liu, Andrey V. Gorbach, Adelina Ilie, Ventsislav K. Valev
Summary: The study presents the first hyperspectral multiphoton analysis of densely-packed stacks of twisted and/or fused WS2 nanosheets, known as nanomesh, which exhibits scalable, efficient, and broadband optical properties due to double resonances induced by internal defects. This makes the nanomesh a prime candidate for integration into quantum optical technologies.
LASER & PHOTONICS REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Paul Herrmann, Sebastian Klimmer, Thomas Lettau, Mohammad Monfared, Isabelle Staude, Ioannis Paradisanos, Ulf Peschel, Giancarlo Soavi
Summary: With conventional electronics reaching its limits, all-optical processes are becoming more attractive for high speed and low power consumption devices. Valleytronics in atomically thin semiconductors is a promising approach, where light-matter interaction allows for efficient manipulation of binary information in energetically degenerate but non-equivalent valleys.
Article
Chemistry, Multidisciplinary
Junjun Shi, Xiaobo He, Wen Chen, Yang Li, Meng Kang, Yangjian Cai, Hongxing Xu
Summary: A dual cavity resonance scheme with remote excitation is developed to significantly enhance SHG in a nanobelt system. The enhancement is achieved through the cooperation of plasmonic and FP cavity modes.
Article
Nanoscience & Nanotechnology
Xiaobo He, Huatian Hu, Zhenyu Yang, Yangjian Cai, Wenqiang Wang, Zhanghua Han, Junjun Shi, Hongxing Xu
Summary: This article presents a method for the separated photodetection of multiple-wavelength surface plasmon polaritons (SPPs) using wavelength-dependent beam splitting technology. By utilizing a plasmonic crystal splitter and MSM photodetectors, independent electrical detection of SPPs with different wavelengths can be achieved.
Article
Chemistry, Multidisciplinary
Linyi Li, Yantao Yu, Peng Li, Jinxin Liu, Lihan Liang, Luyang Wang, Yu Ding, Xiaocang Han, Jiamin Ji, Shengli Chen, Dehui Li, Pan Liu, Shunping Zhang, Mengqi Zeng, Lei Fu
Summary: Perovskite materials have attracted significant attention due to their diverse species and remarkable physical properties. Ultrathin perovskites, compared to bulk crystals, offer more composition options. By constructing an oriented solvent microenvironment, ultrathin perovskites with alterable composition and structure can be synthesized.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yuhao Xu, Huatian Hu, Wen Chen, Pengfei Suo, Yuan Zhang, Shunping Zhang, Hongxing Xu
Summary: This study demonstrates the selective control of nonlinear surface-enhanced Raman scattering (SERS) enhancement in a phononic cavity optomechanical system by tuning the laser-plasmon detuning. The phononic nanodevice shows distinctive properties compared to the molecular system.
Article
Optics
Meng Kang, Li Mao, Shunping Zhang, Meng Xiao, Hongxing Xu, Che Ting Chan
Summary: This study demonstrates the unique advantages of higher-order BICs in constructing merging BICs, which can further improve the Q factors and offer great flexibility in realizing steerable off-Gamma merging BICs.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Quanbing Guo, Binjie Wu, Rongguang Du, Jiamin Ji, Ke Wu, Yang Li, Zhifeng Shi, Shunping Zhang, Hongxing Xu
Summary: Researchers enhance the transport capability of excitons in layered tungsten disulfide by engineering its photonic environment, forming extended polaritonic states. These results provide a unique route for designing high-speed polaritonic devices based on 2D semiconductors.
Article
Chemistry, Multidisciplinary
Haihui Lan, Luyang Wang, Yilin Li, Shugang Deng, Yanan Yue, Tianzhu Zhang, Shunping Zhang, Mengqi Zeng, Lei Fu
Summary: Due to difficulties in material fabrication, the nanostructure and heat transfer properties of two-dimensional indium tellurides have been less studied. This research presents a self-modulation-guided growth strategy to synthesize high-quality 2D In4Te3 single crystals with ultralow thermal conductivity.
Article
Nanoscience & Nanotechnology
Yang Xiong, Huatian Hu, Tianzhu Zhang, Yuhao Xu, Fei Gao, Wen Chen, Guangchao Zheng, Shunping Zhang, Hongxing Xu
Summary: We report a quantitative molecular detection method based on surface-enhanced Raman spectroscopy (SERS) that achieves ultrahigh sensitivity in detecting alpha fetoprotein in serum using a nanoparticle-on-mirror plasmonic sensor. By adjusting the gaps between the nanoparticles and the gold film, a uniform and strong SERS enhancement is achieved. The detection limit is 697 times higher than that of the normal excitation method and 7800 times higher than a commercial assay kit, providing a potential solution for the bottleneck in SERS-based biosensing.
Review
Chemistry, Multidisciplinary
Shenli Wang, Xing Liu, Stefanos Mourdikoudis, Jie Chen, Weiwei Fu, Zdenek Sofer, Yuan Zhang, Shunping Zhang, Guangchao Zheng
Summary: This article summarizes and discusses the role of chiral gold nanorods in the interaction between light and matter, as well as the origin of chirality, chirality transfer, and chiroptical activities. The study is of great significance for manipulating chirality at the nanoscale, revealing natural evolution processes, and circularly polarized applications.
Article
Chemistry, Multidisciplinary
Rongguang Du, Huatian Hu, Tong Fu, Zhifeng Shi, Shunping Zhang, Hongxing Xu
Summary: We have successfully extracted the individual decay channels of a coupled plasmon-exciton system using correlated single-particle absorption and scattering measurements. The plasmon channel exhibits clear Rabi splitting, while the exciton channel does not. The discrepancy in the absorption and scattering spectra is mainly attributed to the distinct contributions of the plasmon and exciton channels in the absorption and scattering process. These findings offer insights into plasmon-exciton interaction in an open cavity and have implications for the design of plexcitonic devices in ultrafast nonlinear nanophotonics.
Article
Multidisciplinary Sciences
Xiangdong Guo, Chenchen Wu, Shu Zhang, Debo Hu, Shunping Zhang, Qiao Jiang, Xiaokang Dai, Yu Duan, Xiaoxia Yang, Zhipei Sun, Shuang Zhang, Hongxing Xu, Qing Dai
Summary: The authors demonstrate analogue reversed Cherenkov radiation in MoO3 at mid-infrared frequencies, and show that stacking hBN layers on the surface of MoO3 can enhance the radiation angle and quality factor. Reversed Cherenkov radiation is highly desired as it can effectively separate radiated light from fast charges, but it has been challenging to achieve in the mid-infrared range due to significant loss in conventional artificial structures.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Tianzhu Zhang, Quanbing Guo, Zhifeng Shi, Shunping Zhang, Hongxing Xu
Summary: Efficient nonlinear optical process at the nanoscale is in high demand for integrating photonic devices. With coherent plasmon-exciton coupling, we achieved more than 3000-fold enhancement in second harmonic generation in a hybrid nanostructure. Polarimetric and layer-dependent measurements reveal the contributions of both plasmon and exciton components in the nonlinear interaction. Our work provides a new approach to enhance nonlinear conversion efficiency and sheds light on the coherent control of plasmon-exciton interaction.
Article
Materials Science, Multidisciplinary
Yu Ding, Xiaozheng Wang, Qiongyi Xu, Zeyou Xiong, Huiliu Wang, Yantao Yu, Tianzhu Zhang, Shunping Zhang, Mengqi Zeng, Lei Fu
Summary: The integration of two-dimensional van der Waals heterostructures offers opportunities for the development of advanced materials. One-dimensional van der Waals heterostructures show rich band structures and strong spin-orbit coupling behaviors, widening their applications in optoelectronics and spintronics. However, the synthesis of one-dimensional van der Waals heterostructure nanoribbons has rarely been reported. Here, we report a general approach to realizing transition metal dichalcogenide heterostructure nanoribbons by unzipping self-assembled TMD heterostructure nanoscrolls. The obtained TMD heterostructure nanoribbons possess flat edge structures and high quality, demonstrating their potential for diverse compositions and stacking modes.
ACS MATERIALS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Tianzhu Zhang, Haixia Li, Yihua Gao, Zhifeng Shi, Shunping Zhang, Hongxing Xu
Summary: We have observed rare three-wave mixing and five-wave mixing in a solid-state system. An output power of 4.7 x 10(-7)µW for five-wave mixing is achieved, which is only 2-3 orders smaller than three-wave mixing, with an excitation power as low as 1.5 mW and peak power density as weak as ∼10(7) W/cm(2). The excitation power dependence of five-wave mixing agrees with the perturbation limit under low intensity but exhibits a strong deviation at high pumping power, which is attributed to the cooperative resonant enhancement effect in the near-infrared range.
Article
Materials Science, Multidisciplinary
Xuan-Ming Shen, Yuan Zhang, Shunping Zhang, Yao Zhang, Qiu-Shi Meng, Guangchao Zheng, Siyuan Lv, Luxia Wang, Roberto A. Boto, Chongxin Shan, Javier Aizpurua
Summary: In this paper, we develop a quantum master-equation theory to study the optomechanical effects in surface-enhanced resonant Raman scattering (SERRS) from a single molecule in a nanoparticle on mirror (NPoM) nanocavity. We use electromagnetic simulations and time-dependent density functional theory calculations to supplement the theory and study the SERRS of a methylene blue molecule in a realistic NPoM nanocavity. The simulations allow us to identify conditions for conventional optomechanical effects and discover distinct behaviors in SERRS.
