Article
Chemistry, Multidisciplinary
Martin Thomaschewski, Vladimir A. Zenin, Saskia Fiedler, Christian Wolff, Sergey I. Bozhevolnyi
Summary: This study utilizes plasmonics to achieve the most efficient lithium niobate Mach-Zehnder modulator (MZM) to date. By guiding plasmonic modes and controlling their relative optical phase delay with electrical signals, efficient electro-optic modulation is achieved. The proposed MZM operates near its quadrature point to ensure high linearity.
Article
Engineering, Electrical & Electronic
Santosh Kumar, Ashutosh Kumar, Rahul Dev Mishra, Prem Babu, Suresh Kumar Pandey, Manoj K. Pal, Mukesh Kumar
Summary: This article proposes a nanophotonic ring resonator based on a slotted hybrid plasmonic waveguide (HPW) for resonance-enhanced sensing. The slotted ring structure provides a propagation length of over 2.5 mm with subwavelength confinement at 1.55 μm wavelength, as well as broadband propagation of HP in the range of 1.3-1.6 μm. By changing the analyte refractive index, a 29.6-nm shift in the transmission spectra is observed, and the sensitivity for detecting polluted water is reported to be 1609 nm/RIU. The proposed slotted waveguide structure has potential applications in nanophotonic devices for biochemical sensing and large-scale photonic integration.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Santosh Kumar, Ashutosh Kumar, Rahul Dev Mishra, Prem Babu, Suresh Kumar Pandey, Manoj K. Pal, Mukesh Kumar
Summary: Proposed a nanophotonic ring resonator based on a slotted hybrid plasmonic waveguide, allowing for resonance-enhanced sensing and strong light-analyte interaction at the subwavelength scale. The structure exhibited a propagation length of over 2.5 mm and subwavelength confinement at a wavelength of 1.55 μm. By changing the refractive index of the analyte, a 29.6-nm shift in the transmission spectra was observed, with a reported sensitivity for detecting polluted water approximately four times higher than a dielectric slotted ring resonator and eight times higher than a ring resonator with a ridge structure. This slotted waveguide structure has potential applications in nanophotonic devices, including biochemical sensing and large-scale photonic integration.
IEEE SENSORS JOURNAL
(2023)
Article
Physics, Multidisciplinary
Jinwen Huang, Zhengyong Song
Summary: The terahertz waveguide modulator combining noble metal and graphene was studied, showing an increase in propagation loss with a change in Fermi level. Optimization of structure parameters led to a modulation depth of 6.1 dB μm(-1) at 5 THz. The device achieved a modulation depth of 1.5 dB μm(-1) at 10 THz while maintaining an effective mode area below 10(-5), due to the confinement of allowed mode in a small area.
Article
Chemistry, Physical
Tarun Sharma, Jiaqi Wang, Zhenzhou Cheng, Kyoungsik Yu, Pratisha Gangwar, Varun Kumar, Dhirendra Sharma, Brajesh Kumar Kaushik
Summary: In this paper, a hybrid plasmonic waveguide (HPW) with low optical loss, variable nonlinearity, and ultralow dispersion is proposed. Through analysis and comparison of different light confinement regions, the optimized HPW structure shows excellent performance and potential applications.
Article
Engineering, Electrical & Electronic
Santosh Kumar Sahu, Samyuktha K. Reddy, Mandeep Singh, Eugene Avrutin
Summary: In this work, a nanoscale 3D hybrid plasmonic waveguide (HPWG) refractive index-cum-temperature sensor was proposed and simulated. It can be used for sensing the refractive index and temperature of aqueous analytes. Numerical simulations were performed to predict the sensitivity of the device, and the sensor was shown to be suitable for next-generation on-chip biochemical sensing applications.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Xueqing He, Tigang Ning, Li Pei, Jingjing Zheng, Jing Li, Jianshuai Wang
Summary: In this paper, a novel graphene-dielectric hybrid plasmonic waveguide (GDHPW) is proposed, with ultra-small mode area and long propagation length achieved by tuning key structural parameters and chemical potential. Low crosstalk properties between two GDHPWs on a substrate are analyzed, and alternative modified structures with optical confinement performances are proposed, serving as fundamental building blocks for various tunable high-density integrated photonic components and devices.
RESULTS IN PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Tao Ma, Shaohui Liu, Yongsheng Tian, Heng Liu, Fang Wang
Summary: A graphene-hBN-silicon hybrid plasmonic rib waveguide is designed for refractive index sensing, achieving a high FOM value by optimizing size parameters and showing remarkable propagation performance peaks. The sensing structure demonstrates good sensitivity for homogeneous and surface sensing, making it suitable for ultra-compact on-chip micro-nano photonic biochemical sensing systems.
IEEE SENSORS JOURNAL
(2021)
Article
Optics
Songyue Liu, Manzhuo Wang, Tingyu Liu, Yan Xu, Jianbo Yue, Yunji Yi, Xiaoqiang Sun, Daming Zhang
Summary: In this paper, a polarization-insensitive graphene-assisted electro-optic modulator is proposed. By utilizing an orthogonal T-shaped metal slot hybrid plasmonic waveguide and dual-layer graphene on the ridge waveguide, the modulator achieves polarization-independent propagation, high modulation depths, and a wide bandwidth.
Article
Chemistry, Physical
Samyuktha K. Reddy, Mandeep Singh
Summary: By simulating a nanoscale tapered plasmonic waveguide, researchers have demonstrated its potential for nanophotonic integrated circuits with better mode area, electric field confinement, and long propagation length. This hybrid plasmonic waveguide is a feasible choice for future on-chip nanophotonic devices.
Article
Nanoscience & Nanotechnology
Longfang Ye, Kouxiang Yuan, Chunhui Zhu, Yao Zhang, Yong Zhang, Kunzhong Lai
Summary: This study demonstrates a variety of ultra-compact high-efficiency graphene phase modulators based on metal-nanoribbon integrated hybrid plasmonic waveguides in the near-infrared region. These GPMs show excellent phase modulation performance with low insertion loss, high modulation efficiency, wide modulation bandwidth and low energy consumption, making them promising for high-speed telecommunications and other graphene-based integrated photonics applications.
Article
Engineering, Electrical & Electronic
Timothy J. Palinski, Brian E. Vyhnalek, Gary W. Hunter, Amogha Tadimety, John X. J. Zhang
Summary: This study demonstrates a platform for the active switching of hybrid plasmonic-photonic Fano resonances, achieving on/off switching of narrow Fano resonance transparency windows with high contrast and tunability across a wide spectral range by modulating refractive index. The structure includes gold nanogratings sandwiched between two dielectric thin films, and controlling the interaction of substrate and superstrate modes through refractive index tuning enables both spectral and spatial selectivity.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Mohammad Reza Jafari, Akbar Asadi, Mehran Shahmansouri
Summary: A novel graphene hybrid dielectric plasmonic nano-waveguide (GHDPNW) was proposed to achieve high propagating efficiency in the mid-infrared spectra. The characteristics of the waveguide, including the frequency of incident wave, Fermi energy of graphene, and the width and thickness of dielectric layers, were investigated using the finite element technique. The results showed that the designed waveguide had a smaller mode area, higher figure-of-merit, and longer propagation length compared to similar waveguides by tuning the thickness of dielectric layers and graphene Fermi energy. Additionally, the waveguide exhibited low crosstalk between neighbor geometries. Due to these excellent properties, the designed structure could be applied in nanophotonic integrated circuits.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Wenyu Zhao, Hongyuan Li, Xiao Xiao, Yue Jiang, Kenji Watanabe, Takashi Taniguchi, Alex Zettl, Feng Wang
Summary: Graphene nanoribbons with low edge roughness fabricated using dry lithography method support low-loss and tunable plasmonic waveguide modes, which were observed using cryogenic infrared nanoscopy and can be adjusted through electrostatic gating.
Article
Engineering, Electrical & Electronic
Wei Chen, Xin Dong, Yan Xu, Yang Gao, Fei Wang, Xiaoqiang Sun, Daming Zhang
Summary: Theoretical demonstration and optimization design of an electrical absorption graphene modulator based on hybrid plasmonic waveguide are introduced in the paper. The modulation performance and frequency response are achieved through the design of vertical metal-insulator-silicon (MIS) waveguide structure and metal electrode. The modulator shows excellent optical and electrical performance, with potential applications in next-generation on-chip optical signal processing.
IEEE PHOTONICS JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Tianzhong Li, Jinyong Wang, Tongkai Chen, Swelm Wageh, Ahmed A. Al-Ghamdi, Jiangtian Yu, Zhongjian Xie, Han Zhang
Summary: In this study, a drug formulation based on lactic acid bacteria (LAB) was developed to produce reactive oxygen species (ROS) in tumors and induce host immunity. The LAB were modified with zeolitic imidazolate framework-67 (ZIF-67) and effectively delivered into tumor cells, leading to the generation of ROS upon light exposure. The bacterial hybrid induced tumor shrinkage through photodynamic therapy and stimulated inflammation to attract immune cells for cancer elimination.
SCIENCE CHINA-MATERIALS
(2023)
Article
Physics, Multidisciplinary
Yuexin Zhang, Jie Tang, Sheng Zhang, Yuanjiang Xiang
Summary: The proposal of higher-order topology in condensed matter physics goes beyond the conventional bulk-boundary principle and leads to intriguing wave propagation properties. Exotic higher-order hinge and corner states have been revealed in lower dimensions through theoretical and experimental models. This concept has also been extended to semimetals and verified in acoustic and photonic systems. However, most existing schemes are limited to C-n-symmetric-like frameworks. In this work, a phononic higher-order Weyl semimetal (HOWSM) is introduced by deforming a traditional two-dimensional lattice with a vertical screw-extending operation, ensuring the emergence of higher-order Weyl points. The structure supports robust hinge wave transmission in a piling sample, providing new approaches for constructing HOWSMs and enriching potential applications in high-performance acoustic devices.
ANNALEN DER PHYSIK
(2023)
Article
Optics
Li Zhongfu, Hsun-Chi Chan, ShiXiang Xu, YuanJiang Xiang
Summary: In this study, two pairs of triply degenerate points (TDPs) are proposed in a 3D metamaterial by breaking the time reversal symmetry. Asymmetric surface states with spin-polarization are revealed based on these TDPs, and a topological chiral beam splitter is demonstrated. The study provides a new platform to study spin-polarization surface states and the enhanced spin photonic Hall effect in metamaterials.
Article
Materials Science, Multidisciplinary
Dapeng Huang, Fei Liang, Ruiqi Guo, Dazhi Lu, Jiyang Wang, Haohai Yu, Huaijin Zhang
Summary: In this study, the broadband self-trapped exciton (STE) states are demonstrated for the first time in Mo-vacancy-rich MoSi2N4 films. The modulation effect of STE states on nonlinear optical processes is verified, which opens up new possibilities for the construction of novel devices and practical applications.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Physics, Applied
Shiwen Chen, Zhongfu Li, Yu Mao, Xiaoyu Dai, Yuanjiang Xiang
Summary: This paper investigates the impact of reflection-type merging BICs on the Goos-Hanchen shift (GH shift) and demonstrates a remarkable enhancement of the GH shift, exceeding five orders of wavelength. The study highlights that even minor fabrication imperfections can result in a significant change in the GH shift, which can serve as a means for detecting manufacturing defects. Furthermore, an ultrasensitive environmental refractive index sensor based on the enhanced GH shift by an isolated BIC is proposed.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Optics
Jie Yang, Sheng Long, Hanyu Wang, Zhide Yu, Biao Yang, Qinghua Guo, Yuanjiang Xiang, Lingbo Xia, Shuang Zhang
Summary: In this study, the coexistence of Dirac points and nodal chain degeneracies in a judiciously designed photonic metacrystal is proposed. The designed metacrystal exhibits nodal line degeneracies lying in perpendicular planes, which are chained together at the Brillouin zone boundary. Interestingly, the Dirac points, which are protected by nonsymmorphic symmetries, are located right at the intersection points of nodal chains. The nontrivial Z2 topology of the Dirac points is revealed by the surface states. The Dirac points and nodal chains are located in a clean frequency range. Our results provide a platform for studying the connection between different topological phases.
Article
Optics
Weipeng Hu, Chao Liu, Xiaoyu Dai, Shuangchun Wen, Yuanjiang Xiang
Summary: This study proposes a method for achieving optimal second harmonic generation (SHG) in a topological cavity by matching the phase distributions of the electric fields of the topological corner state (TCS) and topological edge state (TES). The results show that the intrinsic efficiency can be improved when the phase distributions of the fundamental wave within the TCS and the second harmonic wave within the TES have the same symmetry. With this method, an optimal intrinsic efficiency of 0.165% was achieved.
Article
Optics
Sheng Long, Jie Yang, Hanyu Wang, Zhide Yu, Biao Yang, Qinghua Guo, Yuanjiang Xiang, Lingbo Xia, Shuang Zhang
Summary: In this study, a photonic Dirac-Weyl semimetal is proposed by introducing screw rotation symmetries into a spatial inversion symmetry-lacking system. A realistic metacrystal structure is designed for experimental consideration. The screw rotation symmetries are crucial for the existence of Dirac points, whose Z2 topology is revealed by the (010) surface states. Meanwhile, two pairs of ideal Weyl points at the same frequency are protected by D2d point group symmetries. The Dirac points and Weyl points reside in a clean frequency interval. The proposed photonic Dirac-Weyl semimetal provides a versatile platform for exploring the interaction between Dirac and Weyl semimetals and exploiting possible photonic topological devices.
Article
Optics
Yuexin Zhang, Xiaoyu Dai, Yuanjiang Xiang
Summary: This paper proposes a photonic higher-order topological insulator with a simple multilayer structure. By inserting a metallic pillar, the three-dimensional bandgap is extended, allowing for distinguishable topological modes. The lattice is reconfigurable, and introducing geometrical defects supports vertical disclination states.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Jipeng Wu, Rongzhou Zeng, Jiaojiao Liang, Di Huang, Xiaoyu Dai, Yuanjiang Xiang
Summary: In this study, a one-dimensional photonic crystal Fabry-Perot cavity containing a multi-Weyl semimetal (mWSM) defect is proposed to investigate spin-dependent perfect absorption. By adjusting different parameters, the perfect absorption wavelength of different spin waves can be conveniently controlled. These studies provide simple and effective approaches to acquire spin-dependent and adjustable perfect absorption.
Article
Materials Science, Multidisciplinary
Yuexin Zhang, Chao Liu, Xiaoyu Dai, Yuanjiang Xiang
Summary: The concept of crystalline disclinations in solid-state physics has been researched, revealing novel topological phases and expanding the topological material family. However, there is a need to investigate the bulk-disclination correspondence in three-dimensional topological semimetals. We present an example of a higher-order Dirac semimetal in acoustic crystals with central disclinations, showing potential applications in acoustic devices and exploring high-performance three-dimensional acoustic metamaterials.
Article
Nanoscience & Nanotechnology
Shiwen Chen, Yixuan Zeng, Zhongfu Li, Yu Mao, Xiaoyu Dai, Yuanjiang Xiang
Summary: This work demonstrates the achievement of nonreciprocal transmission and optical bistability for free-space propagation by incorporating Kerr nonlinearities into ultrathin optical metasurfaces. The symmetry-protected bound states in the continuum (BICs) ensure polarization-independent characteristics. Furthermore, the nonreciprocal intensity range can be adjusted by the structure parameters, making this design promising for optical switch, routing, and isolator applications.
Article
Engineering, Electrical & Electronic
Changyou Luo, Yongqiang Kang, Xiaoyu Dai, Yuanjiang Xiang
Summary: In this paper, a cavity containing a unique medium is proposed to enhance the Goos-Hanchen shifts of light beams. The Goos-Hanchen shifts can be controlled by adjusting the intensity and detuning of the coherent control field, without modifying the material and structure of the dielectric interface. This work has significant potential for applications in optical devices, optical-beam steering and alignment, optical sensors, and optical switches.
IEEE PHOTONICS JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Qijun Ma, Xue Chen, Qisen Xiong, Leyong Jiang, Yuanjiang Xiang
Summary: The nonreciprocal surface modes in Weyl semimetal and the nonreciprocal photon occupation number on a graphene surface can be used to manipulate the nonreciprocal near-field energy transfer. In this study, the researchers investigated the near-field radiative heat flux transfer between a graphene heterostructure supported by a magnetic WSM and a twist-Weyl semimetal (T-WSM). They found that the transfer of near-field radiative heat flux can be caused by nonequilibrium fluctuations induced by drift currents. Furthermore, the interaction between nonreciprocal surface modes and the nonreciprocal photon occupation number in graphene allows for flexible manipulation of the near-field heat flux size and direction.
Article
Engineering, Electrical & Electronic
Jie Tang, Yuanjiang Xiang
Summary: This study systematically investigates the nonlinear optical response of indium selenide nanosheets and demonstrates their potential and application value in nanophotonic devices by creating logical gates and nonlinear isolators based on them.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
