Article
Nanoscience & Nanotechnology
Louis Thomas, Theo Hannotte, Cristiane N. Santos, Benjamin Walter, Melanie Lavancier, Sophie Eliet, Marc Faucher, Jean-Francois Lampin, Romain Peretti
Summary: We investigated the near-field distribution of terahertz photonic micro-resonators using scattering scanning near-field optical microscopy, and proposed an image analysis procedure to recover the near-field of such structures. This study is important for high-sensitivity chemical and biochemical sensing as well as fundamental light matter interactions at the nanoscale.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Andreas Beyer, Manveer Singh Munde, Saleh Firoozabadi, Damien Heimes, Tim Grieb, Andreas Rosenauer, Knut Mueller-Caspary, Kerstin Volz
Summary: This study successfully utilized four-dimensional scanning transmission electron microscopy to quantitatively derive and characterize the built-in electric fields in p-n junctions at the nanoscale. The potential of this method lies in directly visualizing nanoscale electric fields in real-life devices.
Article
Engineering, Electrical & Electronic
Yu Shi, Yijing Deng, Peizhao Li, Patrick Fay, Lei Liu
Summary: A fully integrated lens-coupled dual-polarization detector for imaging in the terahertz region was designed, fabricated, and characterized. The detector module can simultaneously measure the two orthogonal linear-polarized components of the incident THz waves, and polarization-resolved imaging of Gaussian beam and birefringent samples was performed. The single-pixel detector demonstrated here is suitable for array applications and has significant impact on remote sensing, through-barrier imaging, and detection/identification applications.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Yuting Miao, Robert C. Boutelle, Anastasia Blake, Vigneshwaran Chandrasekaran, Chris J. Sheehan, Jennifer Hollingsworth, Daniel Neuhauser, Shimon Weiss
Summary: Plasmonic nano-objects have great potential in various applications. This study investigates the interaction between quantum dots (QDs) and L-shaped gold nanoantennas, and demonstrates that this strong interaction can induce polarization-dependent modifications to the QD emission intensity, polarization, and localization.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Optics
Angela Pizzuto, Xinzhong Chen, Hai Hu, Qing Dai, Mengkun Liu, Daniel M. Mittleman
Summary: THz scattering-type scanning near-field microscopy (s-SNOM) is a powerful technique for measuring carrier dynamics in nanoscale materials and structures. Tip-based THz nano-imaging of subwavelength gold nanostructures can show image contrast unrelated to any spatially varying material properties. The specific physical configuration of the gold structures can have a strong influence on local excitations, potentially obscuring the sample's true dielectric response.
Article
Spectroscopy
Junpeng Bai, Ying Ni, Bin Li, Haifeng Wang, Jun Zhu, Chuang Dong
Summary: This study utilized terahertz spectroscopy to accurately detect concentrations of FQs in fish meal feeds, establishing quantitative evaluation models. The results showed that terahertz spectral and imaging technique can precisely visualize concentrations of two FQs in fish meal feeds, providing a new approach for FQs detection in food safety.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Multidisciplinary Sciences
Youngil Moon, Haneol Lee, Jaekap Jung, Haewook Han
Summary: The THz near-field microscope (THz-NFM) is used to directly visualize the distribution of carbon black (CB) aggregates in nitrile butadiene rubber (NBR), revealing significant differences in optical properties between CB and NBR at the THz regime. The area fraction (AF) of the CB aggregates is calculated using a binary thresholding algorithm and compared with the transmission electron microscope method, showing comparable results and indicating the detection of CB in NBR without specimen preprocessing.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Analytical
Masatsugu Niwayama, Naoki Unno
Summary: This study analyzed the measurement characteristics of oximetry by near-infrared spectroscopy at different depths, and found that the measurement depth can be adjusted by combining the proper sensor combination. The prototype of a miniaturized oximeter with optical probes demonstrated the possibility of selectively measuring tissue oxygen saturation.
Article
Engineering, Electrical & Electronic
Yunpeng Zhang, Chunmao Xie, Jing Zhang, Xuefei Chen, Kai Feng, En Li
Summary: This article presents an in situ measurement technology for the absorbing properties of materials based on near-field reflection testing, aiming to meet the requirements of in situ measurement and overcome the limitations of the transmission line probe method in ultrawideband and high-precision measurement. A handheld broadband microwave reflectivity test instrument is developed by designing a miniaturized ultrawideband antenna, a decoupling structure, and a shielding cover, and constructing an in situ measurement probe. The instrument outperforms transmission line probes in measurement accuracy and frequency band, making it suitable for accurately measuring materials with thicknesses of less than 1.5 mm.
IEEE SENSORS JOURNAL
(2023)
Article
Instruments & Instrumentation
V. Trauchessec, V. Drouet, C. Chollet, P. Cornet, I. Masclet-Gobin, S. Chardavoine, P. Prunet, W. Duchastenier, R. Diaz, L. Le Deroff, R. Wrobel, S. Depierreux
Summary: This article briefly describes the newly operating NBI system on LMJ, highlighting the temporally resolved measurements and their synchronization with the LMJ laser pulse. The system measures the stimulated Brillouin and Raman scattered light and achieves temporal resolution through a specifically designed wide-open optical lens.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Optics
Jinwei Song, Junwei Min, Xun Yuan, Yuge Xue, Chen Bai, Baoli Yao
Summary: A method for quantitatively measuring the refractive index and topography of transparent samples is proposed. The method utilizes quadriwave lateral shearing interferometry to obtain quantitative phase images at different wavelengths, and uses Cauchy's dispersion formula to independently calculate the refractive indexes and physical thickness distribution of the sample. No highly dispersive medium or manual operation is required. The measured refractive indexes can identify the composition of the sample in addition to its topography. Simulation and experimental results have confirmed the effectiveness and feasibility of the proposed method.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Environmental Sciences
Shiqi Xing, Shaoqiu Song, Sinong Quan, Dou Sun, Junpeng Wang, Yongzhen Li
Summary: In this paper, a 3D near-field sparse SAR direct imaging algorithm for irregular trajectories is proposed. By utilizing preliminary information in the SAR image to update the dictionary matrix dimension, using the Gaussian iterative method, and optimizing the signal-processing techniques, the algorithm achieves 3D sparse reconstruction in a more direct and rapid manner. This approach significantly reduces computation time and effectively preserves complex scene information for high-resolution image reconstruction.
Article
Chemistry, Multidisciplinary
Ian Hamilton, Magdalena Gebala, Daniel Herschlag, Rick Russell
Summary: We developed a disulfide cross-linking approach, xHEED, to measure the distance-dependent encounter frequency of DNA helices in solution. Our measurements define the relevant distances for electrostatic interactions of nucleic-acid helices and provide insights into the impact of different ionic conditions on these forces.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Biochemical Research Methods
Clothilde Raoux, Margaux Schmeltz, Marion Bied, Maged Alnawaiseh, Uwe Hansen, Gael Latour, Marie-Claire Schanne-Klein
Summary: The study utilized P-SHG microscopy to characterize human corneas from control and keratoconic groups, revealing a loss of order in the lamellar structure of keratoconic corneas, indicating their defective mechanical properties. This structural difference was quantitatively analyzed by computing the entropy and orientation index of collagen orientation distribution, showing significant differences along the full thickness of the cornea.
BIOMEDICAL OPTICS EXPRESS
(2021)
Article
Optics
Jie Zhou, Yanbo Jin, Linpeng Lu, Shun Zhou, Habib Ullah, Jiasong Sun, Qian Chen, Ran Ye, Jiaji Li, Chao Zuo
Summary: A new technique of deep learning-based pixel-super-resolved quantitative phase microscopy is proposed, which enables high-quality phase reconstruction from low-resolution intensity measurement. This technique shows potential applications in high-throughput cellular dynamics analysis and has been successfully implemented in bright-field microscopes.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Ke Wu, Xiaoguang Zhao, Thomas G. Bifano, Stephan W. Anderson, Xin Zhang
Summary: Auxetics, with a negative Poisson's ratio, are utilized to design tunable metamaterials for MRI applications, enabling frequency tunability through electromagnetic interaction modification. The metamaterials fabricated using 3D printing technology show an approximate 20 MHz frequency shift during deformation, resulting in a significant boost in MRI signal-to-noise ratio.
ADVANCED MATERIALS
(2022)
Article
Optics
Benwen Chen, Jingbo Wu, Weili Li, Caihong Zhang, Kebin Fan, Qiang Xue, Yaojia Chi, Qiye Wen, Biaobing Jin, Jian Chen, Peiheng Wu
Summary: A programmable THz metamaterial with embedded phase change material VO2 is presented in this study, which enables modulation of THz waves. The switching speed of each pixel is in the order of 1 kHz, and the memory effect is demonstrated, allowing for generation and storage of multi-state THz images.
LASER & PHOTONICS REVIEWS
(2022)
Article
Optics
Chunxu Chen, Kelson Kaj, Xiaoguang Zhao, Yuwei Huang, Richard Averitt, Xin Zhang
Summary: Metasurfaces have shown great potential in controlling electromagnetic waves using arrays of subwavelength resonators. In this study, a mechanically reconfigurable metasurface based on a microelectromechanical system (MEMS) is presented for dynamic surface wave switching at terahertz frequencies. The metasurface allows for efficient conversion between plane waves and surface waves with a wide working bandwidth. This technology has applications in spatial light modulation, beam steering, focusing, and beam combining for future communication systems.
Article
Engineering, Electrical & Electronic
Ryan McNaughton, Yuda Huo, Guicai Li, Anais Di Via Ioschpe, Lei Yan, Heng-Ye Man, Xin Zhang
Summary: This study demonstrates the use of microfabrication techniques to monitor the morphological and synaptic connectivity changes of neurons in response to physical stimuli. The results show that microtopography can enhance neuron adhesion and axon growth, while inhibiting dendritic arborization and presynaptic puncta architecture.
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Yihui Tan, Kai Qu, Ke Chen, Jingbo Wu, Longcheng Feng, Shengxin Yang, Benwen Chen, Yan Wang, Chi Zhang, Kebin Fan, Caihong Zhang, Junming Zhao, Tian Jiang, Yijun Feng, Biaobing Jin
Summary: Metasurfaces have shown great potential for developing compact photonic devices by controlling the properties of electromagnetic waves. In this study, a free-standing metasurface is designed to manipulate terahertz waves in a broadband and efficient manner. The metasurface achieves full-span phase control and operates in a wide frequency range.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Physics, Applied
Kebin Fan, Vincent Stenger, W. J. Padilla
Summary: We demonstrate a multi-functional metamaterial absorber capable of efficiently detecting millimeter wave radiation at room temperature. By integrating a pyroelectric crystal directly within the metamaterial unit cell, we create an efficient large area sensing element composed of repeating unit cells that are approximately ten times smaller than the operational wavelength. The experimental results show that the monolithic pyroelectric metamaterial geometry functions well as a detector and can serve as an ideal device platform for compact room temperature millimeter wave sensing and imaging components.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Dongyang Xiao, Qian Wang, Zhaosong Wang, Yili Zhang, Jingbo Wu, Kebin Fan, Leimeng Sun, Minmin Zhu, Zhi Kai Ng, Edwin Hang Tong Teo, Fangjing Hu
Summary: In this study, a cost-effective and room-temperature-operated THz imaging device is demonstrated using a flexible and broadband THz absorber based on a vertically aligned carbon nanotube array. The device achieves excellent THz absorption performance and provides an alternative approach for real-time beam profiling and monitoring of THz waves.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Optics
Weili Li, Xuemei Hu, Jingbo Wu, Kebin Fan, Benwen Chen, Caihong Zhang, Wei Hu, Xun Cao, Biaobing Jin, Yanqing Lu, Jian Chen, Peiheng Wu
Summary: In this study, we designed a THz SLM based on tunable liquid crystal metamaterial absorbers for THz single-pixel compressive imaging. By controlling a large frequency shift with an external electric field, we achieved dual-color compressive sensing imaging for dispersive objects. An auto-calibrated compressive sensing algorithm was developed to mitigate the impact of nonuniform THz incident beam and pixel modulation, significantly improving the fidelity of reconstructed images. Additionally, complementary modulation at two absorption frequencies enabled the realization of Hadamard masks with negative element values, reducing the imaging time by half.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Editorial Material
Chemistry, Physical
Richard D. Averitt
Summary: Circularly polarized photoexcitation induces the formation of spin domains in polycrystalline halide perovskite films with strong spin-orbit coupling and local inversion symmetry breaking, as observed by ultrafast optical microscopy.
Article
Materials Science, Multidisciplinary
Yuwei Huang, Kelson Kaj, Chunxu Chen, Zhiwei Yang, Richard D. Averitt, Xin Zhang
Summary: Bound states in the continuum (BIC) is an exotic concept describing systems without radiative loss. This study introduces a structurally tunable BIC terahertz metamaterial fabricated using micromachining and characterized using terahertz time domain spectroscopy. The bending angle of the metamaterial is controlled by thermal actuation to modify the capacitance and achieve tuning from a quasi-BIC state to the BIC state. Temporal coupled mode theory (CMT) is used to gain additional insight into the tunable electromagnetic response of the metamaterial.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Physics, Applied
Ao Chen, Zhiwei Yang, Xiaoguang Zhao, Stephan Anderson, Xin Zhang
Summary: We propose a composite acoustic metamaterial consisting of Mie resonators and a Helmholtz resonator array, which achieves a broadband acoustic attenuation in the low-frequency regime. The wideband soundproofing effect is explained using the transfer-matrix method and the lumped-element model, and the transmission loss and transmittance are tested numerically and experimentally. By using a deep-subwavelength structure, our composite design successfully blocks over 90% of incident acoustic energy within a frequency range of 1250 Hz, offering a design paradigm for extraordinary airborne acoustic silencing in low-frequency regimes.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Xia Zhu, Ke Wu, Stephan W. Anderson, Xin Zhang
Summary: Signal-to-noise ratio (SNR) is an important metric for assessing MRI image quality. This study proposes a Helmholtz coil-inspired volumetric wireless resonator that can significantly enhance SNR. Experimental results show that the SNR can be boosted by 5 times or more in the region covering the human knee. This research offers an efficient and practical wireless solution for improving MRI image quality, with potential applications in various imaging fields.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Analytical
Samuel H. Kann, Erin M. Shaughnessey, Xin Zhang, Joseph L. Charest, Else M. Vedula
Summary: Monitoring steady state oxygen levels in a high-throughput organ-on-chip platform with integrated optical-based oxygen sensors can evaluate drug-induced nephrotoxicity in a human microfluidic co-culture model of the kidney proximal tubule. The study demonstrates the dose and time-dependent injury responses of human PT cells to cisplatin using oxygen consumption measurements in the platform. The results highlight the utility of steady state oxygen measurements as a rapid, non-invasive, and kinetic readout of drug-induced injury in high-throughput microfluidic kidney co-culture models.
Proceedings Paper
Engineering, Electrical & Electronic
Xin Zhang, Zhiwei Yang, Yuwei Huang
Summary: Metamaterials are artificial materials that can control the propagation of electromagnetic waves through precise tailoring. Recent research aims to achieve functional and modular metamaterials that can be controlled in real-time through external stimuli. The application of microsystem technologies enhances the functionality and tunability of metamaterials.
2022 INTERNATIONAL ELECTRON DEVICES MEETING, IEDM
(2022)
