Article
Materials Science, Multidisciplinary
Jing Huang, Bing Meng, Li Chen, Xingfeng Wang, Xiaoying Qu, Menghui Fan, Chaobiao Zhou
Summary: This study investigates the bound states in the continuum (BICs) and light trapping characteristics of quasi-BICs based on PCM GSST. By perturbing the symmetry of the structure, an ideal BIC is transformed into a high-Q-factor quasi-BIC. The average field-enhancement factor (EF) of the quasi-BIC is evaluated, and the effects of structure parameters, polarization angle, and incident angle on EF are discussed. Furthermore, the switching characteristic of light trapping of quasi-BICs is analyzed. The research provides insights into the realization of high-Q-factor metasurfaces and actively tunable and reconfigurable micro or nano optical devices.
Article
Chemistry, Multidisciplinary
Yun Zhao, Zhaoxi Chen, Cheng Wang, Yuanmu Yang, Hong-Bo Sun
Summary: In this experiment, efficient second-harmonic generation (SHG) and high-harmonic generation (HHG) were demonstrated from a LiNbO3 metasurface enhanced by guided-mode resonance. The metasurface showed high SHG efficiency and a wide range of HHG. This work may enable the development of compact coherent white-light sources in the deep ultraviolet region for spectroscopy and imaging applications.
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
Optics
Xuyue Guo, Bingjie Li, Xinhao Fan, Jinzhan Zhong, Shuxia Qi, Peng Li, Sheng Liu, Bingyan Wei, Jianlin Zhao
Summary: Dielectric metasurfaces, as ultra-compact photonic elements, have been developed for versatile manipulation of light waves in multiple dimensions through minimalist design strategy. They demonstrate on-demand light wave modulation with potential applications in various fields.
Article
Engineering, Mechanical
Andrus Giraldo, Behrooz Yousefzadeh
Summary: Circumventing the reciprocity invariance is a challenging task in modern wave engineering device design. Nonreciprocity is commonly achieved by operating passive devices in the nonlinear response regime. Breaking the mirror symmetry is necessary for nonreciprocal dynamics in nonlinear systems. However, the response of an asymmetric nonlinear system is not always nonreciprocal. In this study, we demonstrate the existence of stable, steady-state nonlinear reciprocal dynamics in coupled asymmetric systems under external harmonic excitation by simultaneously tuning two symmetry-breaking parameters. We identify specific response regimes near the system's primary resonances where the left-to-right transmission characteristics are identical to the right-to-left characteristics in terms of frequency, amplitude, and phase. This understanding of reciprocal dynamics can contribute to the design of novel devices for controlling and steering elastic waves.
EXTREME MECHANICS LETTERS
(2023)
Article
Optics
Shan Zhu, Jiaqi Quan, Yangyang Fu, Huanyang Chen, Lei Gao, Yadong Xu
Summary: In this work, a modified diffraction law is proposed to describe nonlinear diffraction phenomena by involving the reciprocal lattice effect of nonlinear metasurfaces. The law is numerically demonstrated and confirmed by designed graphene-based nonlinear metasurfaces in the terahertz regime. Additionally, a nonlinear retroreflector is designed based on the diffraction law, allowing tunable control over a nonlinear wavefront in a single nonlinear metasurface.
Article
Materials Science, Multidisciplinary
Fan Yang, Cristian Ciraci
Summary: We present a theoretical study on second-harmonic generation from a singular metasurface, which strongly interacts with incident light and generates intense surface polarization, resulting in the generation of second-harmonic field. By using transformation optics, the calculation of nonlinear optical response is simplified, and the dependence on the incident angle is weak, making it potentially useful for all-angle harmonic generation. Furthermore, we investigate the symmetry dependence of second-harmonic generation in the far field and demonstrate an enhanced conversion efficiency under normal incidence by breaking the surface inversion symmetry.
Article
Optics
David Haehnel, Christian Golla, Maximilian Albert, Thomas Zentgraf, Viktor Myroshnychenko, Jens Foerstner, Cedrik Meier
Summary: We demonstrate a strong enhancement of third harmonic generation in an amorphous silicon metasurface consisting of elliptical nano resonators, which is attributed to a new type of multi-mode Fano mechanism. Theoretical predictions are confirmed experimentally through linear and nonlinear transmission spectroscopy. Furthermore, quantitative nonlinear measurements reveal an absolute conversion efficiency of eta(max) approximate to 2.8 x 10(-7) at a peak power intensity of 1.2 GW cm(-2), with amplification factors of up to similar to 900 compared to unpatterned silicon films of the same thickness. Our findings open up possibilities for utilizing strong Fano-type multi-mode coupling in metasurfaces for high third harmonic generation in various applications.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Binxu Wang, Xiaoqing Luo, Yalin Lu, Guangyuan Li
Summary: This study proposes a doubly resonant graphene-metal hybrid metasurface which can achieve dynamic phase modulation covering a range of 361° while maintaining high reflectance, enabling dynamically tuneable beam steering and focusing.
Article
Chemistry, Multidisciplinary
Lun Qu, Lu Bai, Chunyan Jin, Qiang Liu, Wei Wu, Bofeng Gao, Juntao Li, Wei Cai, Mengxin Ren, Jingjun Xu
Summary: Metasurfaces is an intriguing framework for nonlinear optics, offering compact design and flexibility in manipulating light. However, the nonlinearity is often limited due to the short interaction lengths with light. In this study, we demonstrate a record high efficiency of second harmonic generation using LN membrane metasurfaces, significantly improving the efficiency of nonlinear metasurfaces.
Article
Chemistry, Multidisciplinary
Chen Chen, Shenglun Gao, Wange Song, Hanmeng Li, Shi-Ning Zhu, Tao Li
Summary: Manipulating spin light using metasurfaces with controlled geometric phase has been successful, especially with the introduction of local phase manipulation technique with planar chiral meta-atoms, which enhances the flexibility and functionality of spin light control in metasurface designs.
Article
Chemistry, Multidisciplinary
Peng Xu, Han Wei Tian, Xiao Cai, Wei Xiang Jiang, Tie Jun Cui
Summary: The proposed single-layer radiation-type metasurfaces enable advanced manipulation of electromagnetic waves by simultaneously controlling arbitrary phases, linear polarization states, and energy distributions. This innovative control approach may lead to the development of novel devices such as a multiple-input multiple-output antenna with efficient crosstalk suppression and information encryption, an energy-controllable router, and a metasurface holographic imaging system based on power transmission algorithms.
ADVANCED FUNCTIONAL MATERIALS
(2021)
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
Chemistry, Multidisciplinary
Zhen Yue, Jingyu Liu, Jitao Li, Jie Li, Chenglong Zheng, Guocui Wang, Mingyang Chen, Hang Xu, Qi Wang, Xiaohua Xing, Yating Zhang, Yan Zhang, Jianquan Yao
Summary: This study introduces a novel technology based on dynamic phase and spatial interleaving unit arrangement for metasurfaces, enabling multiple wavefront manipulations including spin and linear polarization transformations. By designing a bifocal metasurface, various forms of wavefront manipulations can be achieved, offering a new platform for the development of terahertz integrated photonics.
Article
Optics
Muliang Zhu, Sajjad Abdollahramezani, Tianren Fan, Ali Adibi
Summary: Germanium antimony telluride (GST) is a promising material for reconfiguring subwavelength nanostructures due to its strong non-volatile change of the refractive index between amorphous and crystalline states. By incorporating GST into an electromagnetically-induced-transparency-based silicon metasurface, researchers successfully demonstrated a giant third-harmonic generation (THG) switch with high modulation depth. This study shows the high potential of GST-based fast dynamic nonlinear photonic switches for real-world applications.
Article
Materials Science, Multidisciplinary
Sandeep Inampudi, Mohammad Mahdi Salary, Samad Jafar-Zanjani, Hossein Mosallaei
OPTICAL MATERIALS EXPRESS
(2019)
Article
Physics, Applied
Mohammad Mahdi Salary, Hossein Mosallaeia
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Engineering, Electrical & Electronic
Mohammad Mahdi Salary, Hossein Mosallaei
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2020)
Article
Materials Science, Multidisciplinary
Hooman Sedeh, Mohammad Mahdi Salary, Hossein Mosallaei
ADVANCED OPTICAL MATERIALS
(2020)
Article
Optics
Mohammad Mahdi Salary, Hossein Mosallaei
LASER & PHOTONICS REVIEWS
(2020)
Article
Nanoscience & Nanotechnology
Mohammad Mahdi Salary, Hossein Mosallaei
Article
Nanoscience & Nanotechnology
Hooman Barati Sedeh, Mohammad Mahdi Salary, Hossein Mosallaei
Article
Multidisciplinary Sciences
Samad Jafar-Zanjani, Mohammad Mahdi Salary, Dat Huynh, Ehsan Elhamifar, Hossein Mosallaei
Summary: In this study, a novel machine learning method combining the K-means clustering algorithm and conditional Wasserstein generative adversarial networks (cWGANs) was developed for the inverse design of TCO-based active metasurfaces. Multi-objective evolutionary optimization was used to efficiently create a diverse training dataset of high-performance active metasurfaces. The model, based on K-means clustering and cWGANs, can generate designs operating at wavelengths not present in the training dataset and provide insights into the feasibility and interplay of design objectives.
ADVANCED THEORY AND SIMULATIONS
(2021)
Article
Multidisciplinary Sciences
Mohammad Mahdi Salary, Hossein Mosallaei
Summary: Photon propulsion using intense laser beams can help achieve relativistic velocities for deep space exploration, but it requires a balance between acceleration efficiency and stability. This trade-off involves maximizing optical force in the acceleration direction while considering the impact of lateral forces on stability. As a result, there is a need for synergistic engineering to address both requirements in the design of relativistic sails.
ADVANCED THEORY AND SIMULATIONS
(2021)
Article
Optics
Raana Sabri, Mohammad Mahdi Salary, Hossein Mosallaei
Summary: The study investigates a multiwavelength time-modulated meta-molecule for enhanced frequency conversion efficiency and optimized control over multiple resonant wavelengths.
Article
Chemistry, Multidisciplinary
Mohammadrasoul Taghavi, Mohammad Mahdi Salary, Hossein Mosallaei
Summary: Photonics propulsion using lightsails can accelerate spacecraft to relativistic velocities, offering a feasible method for interstellar exploration within human lifetimes. Metasurface-based lightsails are versatile components that can meet the demands of photon propulsion and optical communication in laser-driven deep-space probes, maximizing mission potential.
NANOSCALE ADVANCES
(2022)
Article
Materials Science, Multidisciplinary
Raana Sabri, Mohammad Mahdi Salary, Hossein Mosallaei
Summary: The paper proposes design procedures for near-infrared optical phased arrays (OPAs) and conducts a comparative analysis between the quasi-static and time-modulated OPAs in terms of their dynamic beam-steering functionalities. By using an optimization-based inverse design algorithm, the main shortcomings of the quasi-static OPA are overcome, achieving optimal beamforming tradeoffs between gain and sidelobe ratio. Additionally, the time-modulated OPA offers enhanced spectral and angular bandwidth, wide angle-of-view, and suppressed sidelobes through independent control of amplitude and phase of sideband signals.
ADVANCED PHOTONICS RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Mohammad Mandi Salary, Samad Jafar-Zanjani, Hossein Mosallaei
Article
Computer Science, Information Systems
Hooman Barati Sedeh, Mohammad Mahdi Salary, Hossein Mosallaei