Article
Engineering, Electrical & Electronic
Aruna Veeraselvam, Gulam Nabi Alsath Mohammed, Kirubaveni Savarimuthu
Summary: This study presents a highly sensitive THz sensor for detecting biological samples, with a small footprint and high sensitivity. The sensor's sensitivity was estimated using absorption characteristics, and it was evaluated for various materials and biomedical samples, showing an average sensitivity of 1936 GHz/RIU.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Jinhua Wu, Xiangqian Fan, Xue Liu, Xinyi Ji, Xinlei Shi, Wenbin Wu, Zhao Yue, Jiajie Liang
Summary: This article introduces a multimodal sensor with high sensitivity, accurate sensing resolution, and stimuli discriminability. The sensor is fabricated using MXene and semicrystalline polymer to assemble shrinkable nanochannel structures, enabling distinguishable temperature and pressure sensing. Experimental results demonstrate that the sensor exhibits high accuracy and sensitivity within the human physiological temperature range.
Article
Multidisciplinary Sciences
Xianping Li, Guanghong Zheng, Guozhen Zhang, Jun Yang, Minggang Hu, Jian Li, Ying Li, Hongbo Lu, Zhiping Yin
Summary: This paper presents the design and fabrication process of two highly sensitive sensors working in the terahertz band. The experimental results verify the performance of these sensors under different frequency bands and voltages, and their potential applications in biological and chemical liquid sensing.
Article
Engineering, Electrical & Electronic
Guang-Hua Sun, Hang Wong
Summary: This article presents a design of terahertz (THz) patch antenna array with high gain and wideband features. The proposed array consists of eight subarrays printed on a single-layer high-frequency laminate and a power distribution network realized by a hollow waveguide made from a copper block. The simulated and measured results demonstrate that the proposed array achieves a high impedance bandwidth and gain at the desired frequency range, making it a promising candidate for THz communications.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Ziyin Yang, Xiao Bai
Summary: The use of AgCoO2/MWCNTs as an electrocatalyst for glucose oxidation showed promising results in terms of high sensitivity and wide linear range. The sensor based on AgCoO2/MWCNTs demonstrated excellent analytical performances for glucose detection, indicating its potential for electrochemical sensing applications.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Nicola Anselmi, Luca Tosi, Paolo Rocca, Giovanni Toso, Andrea Massa
Summary: This study focuses on the design of irregular planar phased arrays with a modular architecture. It utilizes rep-tiles, self-replicating tile shapes, to generate array layouts consisting of tiles with different sizes but equal shapes. The use of deterministic optimization allows for the creation of an optimal tradeoff between complexity, costs, and the desired radiated power pattern while ensuring complete overlay of the array aperture. Results demonstrate the effectiveness of this approach in handling large-size array apertures compared to existing tiling techniques.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Yizhen Xu, Zilin Peng, Sichao Wen, Yuandan Dong
Summary: This paper presents a compact omnidirectional circularly polarized (OCP) linear antenna array with a planar configuration. By analyzing a shorted half mode patch antenna and introducing periodic structure changes, two naturally parallel arrays are obtained and integrated into a compact format to achieve OCP radiation. Experimental results verify the effectiveness of the design.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Optics
Shilin Ma, Pei Zhang, Xianwu Mi, Heping Zhao
Summary: This paper presents a highly sensitive terahertz sensor based on a graphene metamaterial absorber in the THz region, which has no polarization sensitivity and can be useful in biological diagnosis and environmental monitoring.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Shilin Ma, Pei Zhang, Xianwu Mi, Heping Zhao
Summary: This paper proposes a highly sensitive terahertz sensor based on a graphene metamaterial absorber in the THz region. The numerical analysis of the sensor using the finite element method agrees well with the analytical results of the coupled mode theory. Moreover, the sensor has no polarization sensitivity. Simulation results show that it has maximum sensitivity, quality factor, and figure of merit for refractive index sensing, making it useful in biological diagnosis and environmental monitoring.
OPTICS COMMUNICATIONS
(2023)
Article
Chemistry, Analytical
Kawin Khachornsakkul, Kuen-Hau Hung, Jung-Jung Chang, Wijitar Dungchai, Chih-Hsin Chen
Summary: A rapid and highly sensitive paper-based colorimetric device for on-site detection of ammonia gas is developed in this study, which operates by detecting the change of color on a paper that has been immobilized with a pH indicator in the presence of NH3 gas. The device can detect NH3 gas concentration within 3 minutes, with a linear relationship between concentration and color signal, showing high selectivity and accuracy.
Article
Spectroscopy
Jie Chen, Fangrong Hu, Shangjun Lin, Zihang Song, Zhitao Duan, Longhui Zhang, Mingzhu Jiang
Summary: In this research, a method for highly sensitive detection of miRNA-21 using a THz metamaterial sensor and HCR technology was proposed. By combining a capture hairpin probe with gold nanoparticles and amplifying the signal through HCR technology, low-concentration miRNA detection was successfully achieved. The results showed good specificity and sensitivity of the method, paving the way for low-cost, easy-to-operate, and marker-free miRNA detection.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Engineering, Electrical & Electronic
Ruiqing Li, Mahyar Panahi-Sarmad, Tianjiao Chen, Ao Wang, Runxin Xu, Xueliang Xiao
Summary: In this study, a simple method to fabricate sandwich-structured capacitive pressure sensors on an industrial scale and at low cost was proposed. The prepared sensors showed high sensitivity, fast response time, and high durability, making them suitable for detecting human movements, object grasping, and pressure distribution. This research demonstrates the potential application of attachable wearable electronics.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Jie Liang, Weijie Gao, Harrison Lees, Withawat Withayachumnankul
Summary: The letter proposes an integrated all-silicon 2-D horn antenna operating over 220 to 330 GHz, with improved gain and impedance matching through the introduction of a 2-D effective-medium dielectric lens on the same platform, allowing for a broadband operation. The fabricated antenna is experimentally validated with measured realized gain across the entire WR-3 band, showing potential for adoption in beyond 5G communications.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2021)
Article
Chemistry, Analytical
Peyman Pourmohammadi, Vladimir Volski, Guy A. E. Vandenbosch
Summary: This paper introduces a technique for designing strongly coupled planar arrays with very high aperture efficiency, achieving maximum efficiency through compact medium-sized arrays, which is important for future IoT applications.
Article
Spectroscopy
Rana Salari, Mohammad Amjadi, Tooba Hallaj
Summary: This paper presents a chemiluminescence (CL) probe comprising CsPbBr3 quantum dots (QDs) in organic phase, Fe(II), and K2S2O8 in aqueous medium for the highly selective and sensitive determination of the antibiotic, cefazolin (CFZ). The CsPbBr3 perovskite QDs prepared using the ligand assisted reprecipitation method exhibit a narrow fluorescence peak at 533 nm under 460 nm excitation with a high quantum yield (42%). Fe(II) S2O82-, as an ultra-weak CL system, is converted into a strong CL sensing platform in the presence of organic phase CsPbBr3 QDs. The designed probe shows an enhanced CL signal in the presence of CFZ in the linear range of 25-300 nM, with a low limit of detection (9.6 nM). The introduced sensor has broad applicability in biosensing, food detection, and other fields, with recovery ranging from 94% to 106%.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Engineering, Electrical & Electronic
Xiaojun Zhu, Shuai Li, Dan Sun, Wen Liu, Juan Cao, Guoan Zhang, Zhanghua Han, Li Zou, Chinhua Wang, Yuechun Shi
Summary: This study proposes a high-sensitivity temperature and curvature microfiber Mach-Zehnder interferometer with two peanut-shaped structures. The experimental results demonstrate the highest temperature sensitivity and curvature sensitivity achieved by the sensor.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Hongji Wang, Yuechun Shi, Yitao Wu, Ziming Hong, Yuxin Ma, Haoyuan Wu, Xiaojun Zhu, Zhanghua Han, Xiangfei Chen
Summary: In this paper, a new configuration of narrow linewidth semiconductor lasers (NLSLs) based on a novel narrow-band reflector (NBR) is presented. By introducing a pi phase-shifted anti-symmetric Bragg grating (pi-ASBG) and a uniform grating reflector, the effective length of the Bragg grating is greatly increased, resulting in a much narrower linewidth compared to traditional NLSLs.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Physics, Applied
Hui Jiang, Zhanghua Han
Summary: The nonlinear optical process of difference frequency generation (DFG) is used to produce continuous-wave terahertz radiations. However, its low conversion efficiency calls for substantial enhancement using all-dielectric nanostructures supporting quasi-bound states in the continuum (QBIC). In this work, the researchers propose using one-dimensional leaky modes with ultrahigh Q factors and large operation bandwidth to eliminate the limitations of conventional QBIC and achieve enhanced conversion efficiency and terahertz generations.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Optics
Hui Jiang, Zhanghua Han
Summary: This study numerically investigates the spectral stability of quasi-bound state in the continuum (BIC) resonances due to temperature changes. The results show that the resonance is very sensitive to ambient temperatures due to the high quality factor of the quasi-BIC mode. The thermal tunability can be utilized to achieve an efficient thermo-optic modulator.
OPTICS COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Chengkai Jiang, Zhe Deng, Bo Liu, Jinhua Li, Zhanghua Han, Yuan Ma, Di Wu, Hiroshi Maeda, Youqiao Ma
Summary: The spin-orbit coupling of light shows unprecedented potential in realizing on-chip integrated nanocircuits and quantum information processing, allowing for the manipulation of polarization and spatial degrees of freedom of photons. A dielectric-loaded plasmonic nanocircuit with a panda patterned transporter was proposed and demonstrated to directionally couple and guide plasmonic waves through two-branched waveguides, achieving a unidirectionality efficiency up to 0.95. This configuration may lead to the development of multifunctional nanocircuits for exploiting chiral manipulation with flexible degrees of freedom.
Article
Nanoscience & Nanotechnology
Kaili Sun, Min Sun, Yangjian Cai, Uriel Levy, Zhanghua Han
Summary: This work demonstrates the strong coupling between quasi-BIC resonances supported by a zigzag metasurface array and the vibrational resonance of PMMA molecules. The strong coupling effect is achieved by tuning the quasi-BIC resonance through changing the thickness of the coated PMMA layer.
Article
Optics
Min Sun, Zhanghua Han
Summary: In this study, the use of quasi-guided modes in a distorted photonic lattice is proposed to address the challenge of spectral matching in photonic structure fabrication. The advantage and flexibility of this scheme in terahertz sensing are demonstrated, and the exclusive detection of alpha-lactose with nanometer-scale thickness is achieved.
Article
Optics
Kobi Ben-Atar, Zhengli Han, Christian Frydendahl, Noa Mazurski, Zhanghua Han, Uriel Levy
Summary: Achieving high-Q resonances in the THz frequency range is important for various applications. This letter investigates a complementary metal-lic disk-hole array (CMA) that combines lattice resonances with Fabry-Perot cavity resonances to achieve record-breaking Q-factors of up to 750 at THz frequencies. This is the highest quality factor measured for a metallic metamaterial structure at THz frequencies to date. (c) 2023 Optica Publishing Group.
Article
Optics
Min Sun, Zhanghua Han
Summary: The efficiency of optical processes depends on the electric field magnitude. However, the performance of metal-based terahertz metamaterials is limited by poor confinement of terahertz waves on metal surfaces. In this study, we propose a new scheme to enhance wave-matter interactions in the terahertz region by utilizing quasi-guided modes. These modes can be achieved by manipulating guided modes supported by a slab waveguide, leading to ultra-high quality factors and large local field enhancement. The presented results provide a novel means to manipulate light-matter interactions.
Article
Engineering, Electrical & Electronic
Ziming Hong, Zhanghua Han, Yuechun Shi, Xiangfei Chen
Summary: The demand for high data transmission rates in wireless communications has led to the use of millimeter waves (MMW) or even terahertz band as the carrier frequency. Hybrid integration between wireless and fiber-optic systems can facilitate seamless signal transition between access and backbone networks. A proposed MMW receiver consists of an electro-optic polymer racetrack waveguide ring resonator (WRR) and a metal dipole antenna, which exploits the Pockels effect to detect the presence of MMW based on the optical method. By using a dipole antenna resonating at the MMW frequency, the phase changes can be significantly improved for enhanced MMW detection. This research presents a low-cost, compact, and reliable MMW receiver that provides an effective functional interface between MMW and optical fiber-optic systems.
IEEE JOURNAL OF QUANTUM ELECTRONICS
(2023)
Article
Optics
Xue Li, Esha Maqbool, Zhanghua Han
Summary: Researchers have achieved narrow-band thermal emission in the mid-infrared wavelength range by utilizing the bound states in the continuum (BIC) modes of the Fabry-Perot (FP) type. This is achieved by separating a disk array of high-index dielectric from a highly reflective substrate with a low refractive index spacer layer. The resulting FP-type BIC exhibits quasi-BIC resonances with ultra-high Q-factor (>103) upon engineering the thickness of the buffer layer. The proposed thermal radiation source offers ultra-narrow bandwidth, high temporal coherence, and economic advantages for practical applications.
Article
Nanoscience & Nanotechnology
Guangdong Wang, Zhanghua Han
Summary: Light can manipulate particles at the micro-or nanoscale by exerting radiation pressure. This study compares the optical forces on polystyrene spheres of the same diameter using numerical simulations. Three optical resonances supported by all-dielectric nanostructure arrays, including toroidal dipole, anapoles, and quasi-bound states in continuum resonances, are examined. The results show that the quasi-BIC resonance generates a significantly larger optical gradient force compared to the other two resonances, indicating its preference for trapping and manipulating nanoparticles. Using low-power lasers is essential for efficient trapping and avoiding harmful heating effects.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2023)
Article
Physics, Applied
Kaili Sun, Uriel Levy, Zhanghua Han
Summary: This study presents a proof-of-principal experimental demonstration on how to realize alternative thermal mid-infrared emitters by utilizing the concept of quasiguided modes. By using an elaborately designed binary grating structure containing a period-doubling perturbation, ultrahigh Q factors that are perturbation-dependent can be achieved. The experimental results show that an emission bandwidth of about 25 nm is obtained at 5.8 μm wavelength, which is an order of magnitude smaller than conventional thermal emitters.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Kaili Sun, Heng Wei, Weijin Chen, Yang Chen, Yangjian Cai, Cheng-Wei Qiu, Zhanghua Han
Summary: Leaky modes with high-Q can be achieved in compound lattices by introducing periodic perturbations. The double-band-folding strategy can lead to ultrahigh-Q leaky modes at any incident angles, providing a generalized recipe for various optical applications.
Article
Materials Science, Multidisciplinary
Min Sun, Guangdong Wang, Yuechun Shi, Zhanghua Han
Summary: In this experiment, a high-performance optical sensor is achieved by utilizing a toroidal dipole response supported by a metasurface structure composed of E-shaped germanium elements. The TD spectral position is found to be highly dependent on the thickness of polymethyl methacrylate (PMMA), with a minimum measurable thickness below 10 nm.
ADVANCED PHOTONICS RESEARCH
(2022)
