Article
Nanoscience & Nanotechnology
Zhen-Ting Huang, Kuo-Bin Hong, Ray-Kuang Lee, Laura Pilozzi, Claudio Conti, Jhih-Sheng Wu, Tien-Chang Lu
Summary: In this study, a straightforward and effective design approach for photonic topological insulators supporting high quality factors edge states is proposed using pattern-tunable strain-engineering. Chiral strain-engineering creates opposite synthetic gauge fields in two domains resulting in Landau levels with the same energy spacing but different topological numbers. The strain strongly affects the degree of localization of edge states, while the two-domain design stabilizes the strain-induced topological edge state, providing large scalability for various photonics applications.
Article
Optics
Doudou Wang, Yue Zhang, Yihan Qi, Jiangkun Tian, Shuai Yue, Tian Ma
Summary: A terahertz surface plasmon resonance (SPR) sensor is designed based on photonic crystal fiber (PCF) with selectively coated graphene as the plasmonic material. The SPR frequency can be dynamically tuned by adjusting the chemical potential of graphene, and it shows sensitivity to changes in the refractive index of analyte.
Article
Chemistry, Multidisciplinary
Timur Ashirov, Ali Coskun
Summary: Membranes are crucial in gas separation for their low cost, energy efficiency, and durability. Researchers have developed a new concept to enhance selectivity of graphene-based membranes by depositing microislands of Pd and Ni on the support layer, enabling efficient separation of specific gases like H2 and CO2. This approach may offer a promising alternative for economical gas separation by selectively targeting individual gases in a membrane setting through adsorptive separation at room temperature.
Article
Nanoscience & Nanotechnology
Jun Wu, Xiuwei Yang, Zhongmin Wang, Biyuan Wu, Xiaohu Wu
Summary: This study investigates tunable multichannel perfect absorption in monolayer graphene at terahertz frequencies achieved by depositing a graphene monolayer on a Fibonacci quasiperiodic multilayer structure. The absorptivity is attributed to the graphene Tamm plasmon polaritons and multiple photonic stopbands of dielectric Fibonacci multilayers. The multichannel operating frequencies can be flexibly tuned through varying the angle of incidence and structure dimensions, and the absorption is not sensitive to the polarization state.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Physics, Condensed Matter
Yawar Mohammadi
Summary: The study of plasmon modes in doped AA-stacked bilayer graphene reveals the potential of using it as a tunable plasmonic device. The long-wavelength acoustic plasmon's existence is hindered as the chemical potential approaches the interlayer hopping energy. Optimal long-lived optical plasmon in undoped AA-stacked BLG can be achieved by satisfying specific conditions.
SUPERLATTICES AND MICROSTRUCTURES
(2021)
Article
Chemistry, Physical
Xiong Deng, Shen Shen, Yanli Xu, Jiangtao Liu, Jun Li, Zhenhua Wu
Summary: This study investigates photonic-crystal-like devices and microcavities in graphene. The results show that these graphene-based devices can be significantly smaller in size compared to conventional photonic crystals, thanks to the shorter optical transport wavelength in graphene. By changing the applied voltage, the functionality of the devices can be altered, making them highly programmable and adjustable. Furthermore, these devices can be integrated with traditional microelectronic circuits, leading to potential applications in photonic integrated circuits and computing.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Xiong Deng, Shen Shen, Yanli Xu, Jiangtao Liu, Jun Li, Zhenhua Wu
Summary: This theoretical study investigates photonic-crystal-like devices and microcavities in graphene. The results show that graphene-based devices can be scaled down significantly compared to conventional photonic crystals due to the shorter optical transport wavelength in graphene. The devices have high programmability and can be integrated with traditional microelectronic circuits, offering potential applications in photonic integrated circuits and computing.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Youssef Trabelsi, Francis Segovia-Chaves, Naim Ben Ali
Summary: The study investigates the transmission spectra of inhomogeneous stratified media following the Octonacci sequence. The transfer-matrix method and the Frequency-dependent dispersion formula according to the two-fluid Gorter-Casimir theory are used. The proposed hetero-structures consist of Yttrium oxide and superconductor YBa2-Cu3O7, resulting in a multilayered nanostructure array. The results show the localization of modes for specific Octonacci structures and different optical properties exhibiting photonic bandgaps. The performance of defect modes is evaluated by controlling various parameters.
RESULTS IN PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Saleh Naghizade, Azadeh Didari-Bader, Hamed Saghaei
Summary: This article presents a novel design for a tunable optoelectronic 2-to-4 binary decoder using photonic crystal ring resonators. By adjusting the chemical potential of graphene nanoshells, the desired PhC resonant mode can be tuned. Numerical results show that this design has very short rise and fall times, making it suitable for high-speed signal processing systems.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Yuexiang Wu, Weiqiang Wu, Jiashun Hu
Summary: A dual-narrowband absorber consisting of graphene and a photonic crystal heterostructure is proposed and analyzed in the terahertz band. The absorption is greatly enhanced due to the excitation of optical Tamm states at the interfaces. The absorber exhibits narrow full width at half maximum (FWHM) absorption peaks that can be tuned by controlling the graphene Fermi energy and photonic crystal periods, and it also maintains high absorption over a wide incident angle range for both TE and TM polarization. The proposed absorber has potential applications in THz biosensors, filters, and switches.
RESULTS IN PHYSICS
(2022)
Article
Chemistry, Physical
Haining Li, Bing Yang, Biao Yu, Nan Huang, Lusheng Liu, Jiaqi Lu, Xin Jiang
Summary: Treatment of hydrogen plasma on silicon nanowires, followed by coatings of nanocrystalline diamond and multilayer graphene, enables enhanced Raman signals with reduced fluorescent background. The graphene-coated nanowires show lower fluorescent background than diamond-coated ones, with a minimum detection limit of 10(7) mol/L and an enhancement factor exceeding 10(4). The stable Raman enhancement is attributed to hydrogen-terminated graphene and the nanowire structure, independent of graphene layers and maintaining stability after exposure to the atmosphere for a month.
APPLIED SURFACE SCIENCE
(2021)
Article
Crystallography
Weiqiang Cheng, Yilian Xiong, Lijuan Ding, Haolin Li, Jiahao Yang, Mingming Zhu, Jianjun Chen, Guojun Zhang
Summary: Graphene-coated SiC nanowires were successfully fabricated by SiC epitaxial growth method. Firstly, centimeter-scale single crystal SiC nanowires were synthesized through carbothermal reduction method. Secondly, epitaxial graphene was grown on the surface of SiC nanowires in a high vacuum and high-temperature environment, resulting in graphene-coated pearl-chain-shaped SiC nanowires. The graphene layer coated on the surfaces of SiCnanowires and the formation of beta-SiC particles were observed. The graphene-coated pearl-chain-shaped SiCnanowires have potential applications in ceramic reinforcement, optoelectronics, mid-infrared and EM wave absorption devices.
JOURNAL OF CRYSTAL GROWTH
(2022)
Article
Physics, Multidisciplinary
Mohsen Zarei, Fakhroddin Nazari, Mohammad Kazem Moravvej-Farshi
Summary: In this article, an optical isolator is designed and simulated based on a hybrid configuration of the photonic crystal (PhC) and graphene. The asymmetrical round trip of the light propagation and the Kerr-nonlinear effect are employed for asymmetric propagation. By altering the chemical potential of graphene, tunable asymmetric transmission can be achieved, offering potential applications in DWDM communication and integrated optical circuits.
Article
Nanoscience & Nanotechnology
Jieun Son, Seulki Ji, Sungho Kim, Soyoung Kim, Seong K. Kim, Wooseok Song, Sun Sook Lee, Jongsun Lim, Ki-Seok An, Sung Myung
Summary: A highly facile method utilizing microcolumns integrated on a QCM gas-responsive system with enhanced chemical selectivity was reported for sensing and identifying volatile organic compound single gases. The addition of microcolumns on the QCM electrode increased the ability to accurately analyze frequency shifts upon sensing various single gas molecules. The system exhibited high detection response values above 50 ng/cm(2) for gases, with the microcolumn-equipped sensor showing improved gas identification ability based on distinct diverging behavior of time constants upon detection of different gases.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Tom Westerhout, Mikhail Katsnelson, Malte Rosner
Summary: In this study, a material-realistic real-space many-body Hamiltonian for twisted bilayer graphene is derived from first principles. Plasmonic quantum dots with tunability are found in electron-doped twisted bilayer graphene supercells, and their similarity to electronic quantum dots is emphasized. The plasmonic quantum dot states are controlled by the system size, doping level, and twisting angle, and they form a versatile platform for tailored light-matter interactions.
Article
Chemistry, Physical
Yingxue Huang, Min Zhang, Irene Ling Li, Hui Yin, Huawei Liang
Article
Nanoscience & Nanotechnology
Huawei Liang, Lei Zhang, Shuang Zhang, Tun Cao, Andrea Alu, Shuangchen Ruan, Cheng-Wei Qiu
Article
Optics
Yingxue Huang, Lei Zhang, Hui Yin, Min Zhang, Hong Su, Irene Ling Li, Huawei Liang
Article
Materials Science, Multidisciplinary
Lei Zhang, Min Zhang, Huawei Liang
ADVANCED OPTICAL MATERIALS
(2017)
Article
Materials Science, Multidisciplinary
Xuan Cong, Lei Zhang, Jiaqi Li, Min Zhang, Hong Su, Irene Ling Li, Shuangchen Ruan, Huawei Liang
ADVANCED OPTICAL MATERIALS
(2019)
Article
Chemistry, Physical
Jun Yuan, Liang Hu, Zhenyu Xu, Yiyue Zhang, Hui Li, Xingzhong Cao, Huawei Liang, Shuangchen Ruan, Yu-Jia Zeng
JOURNAL OF PHYSICAL CHEMISTRY C
(2019)
Article
Chemistry, Physical
Shaolong Huang, Yaojia Long, Huan Yi, Ziyu Yang, Lijuan Pang, Zhengyuan Jin, Qiufan Liao, Liangjing Zhang, Yiyue Zhang, Yuanze Chen, Hongzhi Cui, Jianguo Lu, Xinsheng Peng, Huawei Liang, Shuangchen Ruan, Yu-Jia Zeng
APPLIED SURFACE SCIENCE
(2019)
Article
Materials Science, Multidisciplinary
Jiaqi Li, Lei Zhang, Min Zhang, Hong Su, Irene Ling Li, Shuangchen Ruan, Huawei Liang
ADVANCED OPTICAL MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Zhiyong Wu, Lei Zhang, Min Zhang, Irene Ling Li, Hong Su, Huancheng Zhao, Shuangchen Ruan, Huawei Liang
Article
Chemistry, Multidisciplinary
Xiangyang Li, Zongpeng Song, Huancheng Zhao, Wenfei Zhang, Zhenhua Sun, Huawei Liang, Haiou Zhu, Jihong Pei, Ling Li, Shuangchen Ruan
Summary: In recent years, the use of two-dimensional materials for broadband photodetection has become a promising area in optoelectronic devices. Synthesized SnSe nanosheets integrated with monolayer graphene showed high photoresponsivities and excellent response speeds for different incident lasers, demonstrating their potential for advanced optoelectronic applications.
Article
Chemistry, Multidisciplinary
Zhiyong Wu, Lei Zhang, Tingyin Ning, Hong Su, Irene Ling Li, Shuangchen Ruan, Yu-Jia Zeng, Huawei Liang
Summary: A novel graphene nanoribbon gap waveguide (GNRGW) is proposed for guiding dispersionless gap SPPs with deep-subwavelength confinement and low loss. Experimental results demonstrate distortionless pulse transmission and independent control of multiple channels with a GNRGW array.
Article
Chemistry, Multidisciplinary
Xin Li, Zhongshuai Zhang, Yanyan Huo, Lina Zhao, Qingyang Yue, Shouzhen Jiang, Huawei Liang, Yuanmei Gao, Tingyin Ning
Summary: The study explores the modeling of optical bistability in all-dielectric guide-mode resonance grating (GMR) nanostructures operating at quasi-bound states in the continuum (BICs). It demonstrates the potential of these nanostructures in the field of all-optical devices, with ultra-low threshold and broadband optical bistability driven by quasi-BICs.
Article
Optics
Wenqi Zhu, Jinhui Lu, Min Zhang, Hong Su, Ling Li, Qi Qin, Huawei Liang
Summary: In this research, a tunable splitting ratio terahertz (THz) beam splitter is demonstrated using a metasurface integrated onto a prism. The metasurface converts part of the incident wave into a cross-polarized wave and manipulates its phase, allowing it to pass through the interface even at large incident angles. The splitting ratio of the device can be adjusted by tuning the resonant response of the metasurface and varying the distance between the metasurface and the prism.
Article
Chemistry, Physical
Yaojia Long, Shaolong Huang, Huan Yi, Jiaqi Chen, Jiahao Wu, Qiufan Liao, Huawei Liang, Hongzhi Cui, Shuangchen Ruan, Yu-Jia Zeng
JOURNAL OF MATERIALS CHEMISTRY A
(2019)