Article
Optics
Min Zhang, Danni Hao, Shuai Wang, Rui Li, Shou Wang, Yanqing Ma, Ramiro Moro, Lei Ma
Summary: This paper reports a subwavelength chiral metamaterial structure with tunable geometries and compositions for chiral biochemical sample detection. The chiroptical response of the metamaterial can be adjusted by manipulating the number of stacking layers and the twisted angle of the periodic unit. Experimental and numerical analysis reveal that the chiroptical response originates from the optical resonances of the gold disks and the adjacent array layers. The chiral metamaterial can achieve label-free detection of proline in biological samples and enantio-discrimination of chiral molecules, and the transmission circular dichroism (TCD) intensity can be regulated by the analyte concentration.
Article
Optics
Jibo Fu, Meng Jiang, Peng Suo, Wenjie Zhang, Xian Lin, Xiaona Yan, Saifeng Zhang, Guo-Hong Ma
Summary: In this study, a newly ultrafast optically modulated terahertz switch based on platinum diselenide (PtSe2) is reported. The response time of the semimetal phase PtSe2 is faster than the semiconducting phase when increasing film thickness. The rapid component after photoexcitation has a lifetime of approximately 1.5 ps for semiconducting-phase films and less than 1 ps for the semimetal phase, while the slow component has a lifetime of a few hundred picoseconds.
Article
Physics, Applied
Chenglong Zheng, Jie Li, Silei Wang, Jitao Li, Mengyao Li, Hongliang Zhao, Xuanruo Hao, Huaping Zang, Yating Zhang, Jianquan Yao
Summary: This study presents all-silicon chiral metasurfaces for highly efficient circular polarization differential transmittance in the terahertz band. In addition to characterizing the static chiral properties, dynamic chiral behaviors are also investigated using optical pumping. The application of the chiral metasurface in polarization multiplexed near-field image display is also demonstrated.
APPLIED PHYSICS LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Yuwang Deng, Qingli Zhou, Pujing Zhang, Nan Jiang, Tingyin Ning, Wanlin Liang, Cunlin Zhang
Summary: The research demonstrates the active manipulation of metamaterial-induced transparency (MIT) in a terahertz hybrid metamaterial with a graphene overlayer under photoexcitation. The introduction of graphene modifies the resonant dips and transparency window, and transient control of MIT behaviors is determined by photogenerated carrier dynamics. Furthermore, the addition of graphene to the hybrid metamaterial enhances terahertz response.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Zhenshan Yu, Hao Chen, Xuequan Chen, Yu-Sheng Lin
Summary: This study presents a silicon dielectric metamaterial (SDM) composed of two outer symmetric semi-circular rings and two inner symmetric split-ring resonators (SRRs). The electromagnetic responses of the SDM device in different modes were studied through numerical simulations and experiments. Increasing the structure height of the SDM device resulted in red-shifted resonances and stronger intensities. This study provides a new design strategy for the development of frequency filtering, polarization switching, and resonance modulation characteristics in THz-wave applications.
MATERIALS RESEARCH BULLETIN
(2024)
Article
Chemistry, Multidisciplinary
Jing Lou, Xing Xu, Yindong Huang, Ying Yu, Jun Wang, Guangyou Fang, Jiangang Liang, Chunhai Fan, Chao Chang
Summary: Arming metasurface with active materials provides a feasible solution for dynamically controlling THz waves, essential for the upcoming sixth generation telecommunications. This study demonstrates a germanium (Ge) hybrid Fano metasurface under dual-stimulus control, achieving significant reduction in pump threshold and increased THz amplitude modulation.
Article
Chemistry, Multidisciplinary
Liang Fei, Weidong Yu, Zonghuai Wu, Yunjie Yin, Kasper Moth-Poulsen, Chaoxia Wang
Summary: Leuco dye-based thermochromic materials have great potential for visible molecular logic due to their reversible color-changing effect. However, controlling the bistable color function at the desired temperature is still a challenge. By designing a series of azobenzenes with different alkyl chains, protonation competition with the leuco dye can be achieved, allowing for the locking and releasing of the color developer. This optically controlled leuco dye-based system demonstrates visible sequential logic operations and provides a new type of protonation-based optical control.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Materials Science, Multidisciplinary
Chuanxin Chen, Minqi Chai, Meihua Jin, Tao He
Summary: Terahertz metamaterial absorbers (TMAs) efficiently absorb electromagnetic waves in the range of 0.1-10 THz, achieving perfect absorption and broad band absorption. Their ultra-thin design and tunable electromagnetic properties make them highly valuable in communication, imaging, detection, and security inspection applications.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Chemistry, Multidisciplinary
Shan Yin, Dehui Zeng, Yuting Chen, Wei Huang, Cheng Zhang, Wentao Zhang, E. Yiwen
Summary: Researchers have proposed an optically controlled dynamic beam splitter with adjustable split ratio in the terahertz region for the first time. The beam splitter achieves dynamic modulation of the split ratio using metasurfaces and a spatial light modulator, while maintaining stable split angles.
Article
Physics, Applied
J. J. F. Heitz, L. Nadvornik, V Balos, Y. Behovits, A. L. Chekhov, T. S. Seifert, K. Olejnik, Z. Kaspar, K. Geishendorf, V Novak, R. P. Campion, M. Wolf, T. Jungwirth, T. Kampfrath
Summary: The study demonstrates complete suppression of terahertz-pulse-induced resistance switching in antiferromagnetic CuMnAs thin films using ultrafast gating. Gating functionality is achieved through optically generated transiently conductive parallel channels in the semiconductor substrate, with suppression timescale determined by photocarrier lifetime. Effects observed are mediated primarily by the substrate, with potential application for transient low-power masking of structured areas with feature sizes of about 200 nm and smaller.
PHYSICAL REVIEW APPLIED
(2021)
Article
Optics
Fenghao Yin, Yanlin Lv, Dongyan Xu, Xing Ri Jin, Ying Qiao Zhang
Summary: We propose a terahertz chiral metamaterial that can manipulate the transmission of linear polarized waves, converting them to elliptical polarization and generating circular dichroism in transmission mode, while showcasing asymmetry reflection of circular polarized waves. The device achieves dual-band asymmetry transmission at 0.42 THz and 1.04 THz, with transmission factors reaching peak values of -0.51 and -0.55, respectively. Additionally, it enables intense linear-to-elliptical polarization conversion at 0.81 THz and 0.97 THz. When circular polarized waves are incident, it exhibits strong circular dichroism at 0.36 THz and asymmetry reflection with maximum asymmetry reflection factors approaching 0.55.
Review
Nanoscience & Nanotechnology
Riccardo Degl'Innocenti, Hungyen Lin, Miguel Navarro-Cia
Summary: The terahertz range is a fast-evolving field with unique applications in spectroscopy, quantum electronics, sensing, and wireless communications beyond 5G. Among various approaches, metamaterial-based terahertz modulators have shown great success due to their ease of realization, high efficiency, and spectral versatility. This review presents the latest developments in this field, with a focus on key applications in sensing, wireless communications, and quantum electronics that have benefited from these advancements.
Article
Chemistry, Physical
Hang Peng, Jun-Chao Qi, Wei-Qiang Liao
Summary: This work reports an organic ferroelectric material that achieves polarization switching through optical control. The material demonstrates photoinduced structural isomerization and temperature-induced phase transition, exhibiting reversible polarization switching under light irradiation. This finding is significant for the development of molecular ferroelectric materials with optical control of polarization switching and potential applications.
CHEMISTRY OF MATERIALS
(2022)
Article
Optics
Erich N. Grossman, Daniel Feldkhun, Sean McComb, Kelvin Wagner
Summary: We demonstrate the migration of a new type of structured-illumination imaging from the optical to the terahertz domain. This technique involves illuminating a target with rapidly moving sinusoidal fringes while measuring the scattered radiation on a single fast detector, enabling imaging of the target.
Article
Engineering, Electrical & Electronic
Tao Xu, Xiaocan Xu, Yu-Sheng Lin
Summary: The design of electric split-ring metamaterial (eSRM) with tunable terahertz free spectra range (FSR) characteristic allows stable operation in both TE and TM modes, with the ability to tune and switch electromagnetic responses between dual- and quad-resonance. The eSRM demonstrates sensitivity to polarization angle and can be used for sensing applications exposed to different surrounding refraction index, with a sensitivity of 0.457 THz/RIU and average Q-factor and FOM values of 40.65 and 35.47, respectively.
JOURNAL OF MICROELECTROMECHANICAL SYSTEMS
(2021)
Article
Physics, Multidisciplinary
Pengtao Lai, Zenglin Li, Wei Wang, Jia Qu, Liangwei Wu, Tingting Lv, Bo Lv, Zheng Zhu, Yuxiang Li, Chunying Guan, Huifeng Ma, Jinhui Shi
Summary: In this study, a transmissive anisotropic coding metasurface is proposed, which enables independent control of two orthogonal polarizations. It has been experimentally verified that it can achieve OAM beam of right-handed polarized wave, contributing to the enrichment of polarization manipulation field and the development of transmissive coding metasurfaces.
Article
Engineering, Electrical & Electronic
Peixuan Tian, Chunying Guan, Peng Ye, Tailei Cheng, Jing Yang, Zheng Zhu, Jinhui Shi, Jun Yang, Libo Yuan
Summary: A novel magnetic field sensor based on hollow suspended-core fiber (HSCF) has been proposed and fabricated. The sensor achieves high sensitivity by filling magnetic fluid into the microfluidic channel of the fiber and utilizing interference principle. With the advantages of robustness, high sensitivity, simple interference spectrum, and integrated microfluidic channel, the sensor has promising applications in various fields.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Optics
Tingting Lv, Yicheng Li, Chunhua Qin, Jia Qu, Bo Lv, Wenjia Li, Zheng Zhu, Yuxiang Li, Chunying Guan, Jinhui Shi
Summary: This study investigates versatile polarization manipulation in a hybrid terahertz metamaterial consisting of bilayer rectangular rods and a complementary vanadium dioxide (VO2) layer. The VO2 phase transition enables flexible switching from dual-band asymmetric transmission to dual-band reflective half-wave plate, with broadband polarization conversion. The findings are important for the development of multifunctional polarization devices and multichannel polarization detection.
Article
Optics
Yicheng Li, Zhengwei Deng, Chunhua Qin, Shicheng Wan, Bo Lv, Chunying Guan, Jun Yang, Shuang Zhang, Jinhui Shi
Summary: This study proposes a bilayer metasurface with orthogonally oriented split-ring resonators (SRRs), in which a phase transition of eigenpolarization states is introduced by changing the conductivity of vanadium dioxide (VO2) patch. The metasurface exhibits a passive parity-time (PT) symmetry, and an exceptional point (EP) in polarization space is observed at a certain conductivity of the VO2. Two sensing schemes using the metasurface are proposed for high-sensitivity sensing of temperature and refractive index in the terahertz (THz) range. The metasurface shows great potential for THz biosensing and polarization manipulation applications.
Article
Physics, Applied
Hongzhou Chen, Zhenyu Duan, Chunying Guan, Shan Gao, Peng Ye, Yan Liu, Jing Yang, Hongchao Liu, Jinhui Shi, Jun Yang, Libo Yuan
Summary: In this study, a compact all-fiber speckle spectrometer was constructed using cascading coreless fibers and photonic crystal fibers, achieving high resolution performance. The proposed fiber structure generates more guided modes and forms speckle patterns through modal interferences. With a 10 cm-long fiber, a resolution of 0.03 nm over a bandwidth from 1540 to 1560 nm was achieved. The performance of this spectrometer surpasses that of a 2 m multimode fiber spectrometer and is approximately 20 times higher than that of the same length multimode fiber.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Jing Liu, Chunying Guan, Hongzhou Chen, Bo Liu, Tailei Cheng, Jing Yang, Jinhui Shi, Libo Yuan
Summary: A transverse multi-position optical fiber tweezer is developed by integrating an all-dielectric metasurface on the end of the dual-core optical fiber, enabling trapping of nanoscale nanoparticles in far field. The tweezer utilizes the deflection of the emitted beams from the fiber cores to form interference fringes. The dielectric metasurface-based fiber tweezer shows higher efficiency and stronger capturing force compared to metal-based metasurfaces.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Kaihao Zheng, Wenjia Li, Botian Sun, Yehan Wang, Chunying Guan, Jianlong Liu, Jinhui Shi
Summary: In this study, we investigate the annular transverse scattering and unidirectional transverse scattering by magnetoelectric coupling of the Ω particle. The annular transverse scattering is achieved by the longitudinal dipole mode of the Ω particle. Furthermore, we demonstrate highly asymmetric unidirectional transverse scattering by adjusting the transverse electric dipole and longitudinal magnetic dipole modes, while suppressing forward and backward scattering through interference. The lateral force exerted on the particle is accompanied by transverse scattering, providing a useful toolset for manipulating scattered light and expanding the application range of magnetoelectric particles.
Article
Nanoscience & Nanotechnology
Chunhua Qin, Yiyuan Wang, Ziying Liu, Wenjia Li, Yuxiang Li, Ping Li, Zheng Zhu, Chunying Guan, Jinhui Shi, Kenneth T. V. Grattan
Summary: In this study, a miniaturized high-efficiency polarizer based on an Au-on-silica grating structure has been proposed, which can cover the entire visible and near-infrared spectral ranges with an extinction ratio (ER) of 60 dB in this range. By regulating the thickness of the grating, an ER of up to 150 dB can be achieved. By integrating this high-performance polarizer with an optical fiber meta-tip, a refractive polarizer with an ER value of >45 dB over the entire spectral range has been demonstrated.
Article
Engineering, Electrical & Electronic
Ziyang Xiong, Shan Gao, Binbing Li, Yan Liu, Ping Li, Jing Yang, Jinhui Shi, Libo Yuan, Chunying Guan
Summary: A temperature sensor based on side-polished two-core fiber Michelson interferometer has been demonstrated, showing high sensitivity and minimal influence from humidity, making it suitable for applications in industrial, chemical, pharmaceutical, and other fields.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Yuan Jin, Peng Ye, Jing Yang, Shan Gao, Feng Zou, Xuelan He, Zheng Zhu, Jinhui Shi, Libo Yuan, Chunying Guan
Summary: A vector bending sensor based on hole-assisted three-core fiber Mach-Zehnder interferometer is presented. The sensor includes multi-mode fiber HATCF MMF structure embedded between two single-mode fibers. The wavelength of the interference peak can be used to identify the bending curvature and direction, with a maximum bending sensitivity of -28.726 nm/m(-1) at a direction of 220 degrees. Additionally, the sensor exhibits a temperature sensitivity of 44 pm/degrees C and is not affected by external refractive index.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Optics
Yu Liu, Shan Gao, Jing Yang, Zhenyu Duan, Peng Ye, Linhui Cai, Zheng Zhu, Jinhui Shi, Jun Yang, Libo Yuan, Chunying Guan
Summary: A hole-assisted three-core fiber (HATCF) has been proposed as a sensor for simultaneous measurement of refractive index (RI) and temperature. By changing the phase matching wavelength between the center core and the suspended core, the measurement of the solution can be achieved, with advantages such as a simple structure, high integration, and dual parameter measurement.
Article
Optics
Yu Liu, Jing Yang, Yuxiao Xue, Shan Gao, Peixuan Tian, Peng Ye, Zhenyu Duan, Jinhui Shi, Jun Yang, Libo Yuan, K. T. V. Grattan, Chunying Guan
Summary: An optical fiber sensor based on a hole-assisted dual-core fiber has been proposed for dual-parameter measurements, achieving simultaneous measurement of salinity and temperature. The sensor offers advantages of simplicity in fabrication, high integration, and potential applications in marine environment measurements.
Article
Optics
Hongzhou Chen, Zhenyu Duan, Chunying Guan, Xixin Li, Shan Gao, Xiao Hu, Peng Ye, Jing Yang, Ping Li, Jinhui Shi, Libo Yuan
Summary: This study proposes a method that balances miniaturization and high performance of fiber optic speckle spectrometers. By using periodically tapered coreless fiber as the scattering element, high-resolution spectral reconstruction is achieved with significant improvement in device miniaturization.
Article
Optics
Qingdong Yang, Yi Wang, Jinhui Shi, Changxu Liu, Shuang Zhang
Summary: This study proposes a novel method for achieving arbitrary power distribution by leveraging the unique properties of an Epsilon Near Zero (ENZ) environment. It shows that power from a single source can be transferred to multiple receivers inside an ENZ medium by modifying the optical properties of the receivers. This approach eliminates the need for complex configurations and communications and enables efficient energy transfer.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Wenjia Li, Haoran Li, Zhaoqi Jiang, Wenxia Xu, Yang Gao, Shutian Liu, Zheng Zhu, Chunying Guan, Jinhui Shi, Jianlong Liu
Summary: This study reveals that unpolarized light not only acquires a definite spin state after scattering but also induces lateral separation of scattered light with opposite chiralities. The spin-locked scattering of unpolarized light arises from the magnetoelectric coupling of the scatterer. Additionally, the spin-locked scattering for arbitrary linearly polarized light is investigated and compared with that of unpolarized light.
