Article
Engineering, Electrical & Electronic
Qian He, Li Pei, Jianshuai Wang, Jingjing Zheng, Tigang Ning, Jing Li
Summary: In this article, a phase-correct quantitative phase microscopy (PC-QPM) method is proposed to accurately and nondestructively measure the refractive index profile (RIP) of optical fibers. By introducing the PC algorithm and establishing a new 3D refractive index measurement configuration, the 3D-RIP measurement in transverse and longitudinal directions is achieved, and commercial fibers are successfully tested.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Optics
Zhifeng Li, Hai Lin, Rui Zhou, Xintong Shi, Zihao Yu, Y. Liu, Jian Wu, Rongxin Tang
Summary: This paper investigates the excitation of toroidal dipole mode through the design of the unit cell in a photonic crystal to suppress radiative losses of other multipoles. The photonic crystals with Dirac-like dispersion at the G point can be mapped to a zero-index medium. The proposed photonic crystal slab has low-loss and easy integration properties.
Article
Optics
Yong Wei, Chunbiao Liu, Chunlan Liu, Lingling Li, Lei Hu, Yonghui Zhang, Xiaoling Zhao, Tianci Jiang, Rui Wang, Chen Shi
Summary: In this paper, a single-mode fiber curvature sensor based on surface plasmon resonance (SPR) is designed and fabricated. By bending the fiber, the curvature measurement is achieved by changing the incident angle and depth of the resonance valley. Experimental results show that a smaller cutoff wavelength leads to higher sensitivity in valley depth and narrower half height width (FWHM).
Article
Optics
Qian He, Li Pei, Jianshuai Wang, Jingjing Zheng, Tigang Ning, Jing Li
Summary: This paper proposes a 3D refractive index profile visualization method to demonstrate mode activation and evolution in fiber fusion splicing. The method is validated through experimental results and provides support for various fiber splicing operations and mode coupling modulation.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Physics, Applied
Zhuo Wang, Yue Wang, Zhi Cheng, Jiaqi Qu, Mingjie Cui, Dongmei Huang, Changyuan Yu
Summary: In this study, a plasmonic metasurface integrated with monolayer graphene is designed to achieve tunable flatband quasi-BICs. By adjusting the chemical potential of graphene, the Q-factor and absorption amplitude can be significantly improved, enabling dynamically adjustable near-field enhancement.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Shangpeng Qin, Junyang Lu, Yang Yu, Minwei Li, Junbo Yang, Zhenrong Zhang, Yang Lu, Zhou Meng
Summary: This paper proposes an optical fiber magnetic field and temperature sensor based on OMC, PDMS, and MF, which has high sensitivity, low cost, and can sense magnetic field and temperature separately. The sensor characteristics were analyzed theoretically and verified experimentally, showing maximum magnetic field sensitivity of 96.8 pm/Oe and maximum temperature sensitivity of 919.1 pm/degrees C. The sensor's cross-sensitivity was overcome by establishing a sensitivity matrix and optimizing the demodulation matrix through size design of the PDMS package and OMC structure.
Article
Materials Science, Multidisciplinary
R. Swathi, J. Shanthi, K. K. Anoop
Summary: The study presents a method for preparing antireflection coating with super wetting property, achieving high transmittance by tuning the refractive index of the coating. The AR coating deposited on glass substrate shows excellent transmittance in UV-visible and solar radiation, along with superhydrophilic property.
Article
Optics
Chen Ling, Jue LI, Yiping Wang, Houyuan Chen, Lingyun Gu, Yanwei Ding
Summary: Studying high-sensitivity fiber-optic temperature sensors is essential for achieving high-precision temperature measurement. This study proposes a liquid-sealed multimode interference fiber temperature sensor with a double-taper structure and analyzes the influence of structure and sealed-liquid material on the temperature sensitivity of the sensor experimentally.
Article
Physics, Applied
Jun-Yang Sui, Jia-Hao Zou, Si-Yuan Liao, Bing-Xiang Li, Hai-Feng Zhang
Summary: In this Letter, a highly sensitive terahertz Janus sensor based on photonic spin Hall effect (PSHE) is proposed. The sensor has a Janus feature, realizing the multitasking of thickness and refractive index detection on multiple scales. It has potential applications in accelerating the research of graphene materials and providing real-time, label-free, and low-cost detection in the biomedical field.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Jae-Sang Lee, Yong-Jin Kim, Seong-Hyeon Cho, Byeong-Tak Park, Woo June Choi, Young-Wan Choi
Summary: In this work, a multi-mode resonator based on SU-8 polymer is presented and it is experimentally verified that the resonator with mode discrimination can be used as a high-performance sensor. The fabricated resonator shows sidewall roughness, which is usually considered undesirable. The effect of sidewall roughness is analyzed through resonator simulation and mode discrimination still occurs even with the roughness. Additionally, the controllable waveguide width achieved through UV exposure time contributes effectively to mode discrimination. The resonator is further verified as a sensor with a temperature variation experiment, showing a high sensitivity of about 630.8 nm/RIU. This result indicates that the multi-mode resonator sensor fabricated through a simple process is competitive with other single-mode waveguide sensors.
Article
Optics
Xiang Hu, Yanchao Hu, Wenhao Zhang, Jing Hu, Feng Li, Wei Su, Hong Wu
Summary: A compact photonic crystal nanobeam cavity with dual-parameter sensing capabilities for refractive index and temperature is proposed. The cavity supports simultaneous air and dielectric modes and demonstrates high sensitivities and resistance to external interference.
Article
Nanoscience & Nanotechnology
Wenjing Guo, LiHong Zhai, Zeinhom M. El-Bahy, Zhumao Lu, Lu Li, Ashraf Y. Elnaggar, Mohamed M. Ibrahim, Huiliang Cao, Jing Lin, Bin Wang
Summary: In this research, a terahertz metamaterial biosensor based on the open square ring structure is designed and its absorption performance and sensing performance are analyzed through simulation and testing. The results demonstrate that the sensor exhibits a narrow absorption peak at a resonant frequency of 0.635 THz with an absorption rate of 98.7% and a half-wave width of 8.02 GHz. The sensor shows the best absorbance when the analyte thickness is 30 μm and the opening width is 10 μm. The sensor also exhibits a high-quality factor of 79.26 and a sensitivity of 91.5 GHz/refractive index unit (RIU), making it suitable for label-free high-sensitivity biomedical sensing.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2023)
Article
Optics
Zhou Zheng, Zhengying Li, Qingguo Du
Summary: A multi-parameter optical refractometric sensor based on lab-in-a-fiber has been proposed and investigated. It utilizes a specific three suspended-core fiber design for liquid circulation and detection. By coating a bio-recognition layer on the surface of the channels, multiple disease markers can be detected, and their concentration can be measured by the wavelength of fiber Bragg grating in each suspended core. The sensor demonstrates high sensitivity and accuracy.
Article
Engineering, Electrical & Electronic
Xiaoyuan Lu
Summary: Studying narrowband plasmonic absorbers is critical for achieving higher sensor sensitivity; graphene-based metasurfaces show a narrowband reflection spectrum with high absorption in the infrared range; this structure has potential for biosensing applications, such as monitoring neural stem cell activities during cell development.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Biophysics
Tomas Vicar, Jiri Chmelik, Jiri Navratil, Radim Kolar, Larisa Chmelikova, Vratislav Cmiel, Jiri Jagos, Ivo Provaznik, Michal Masarik, Jaromir Gumulec
Summary: Cell viscoelastic properties can provide valuable information about the functional state of cells. This paper presents a system and method for measuring cell viscoelasticity using shear stress induction by fluid flow. Quantitative phase imaging is used for image acquisition, and a new approach based on linear system modeling and parametric deconvolution is used to determine viscosity and elasticity. The proposed method allows for high-throughput measurements during live-cell experiments and enables the simultaneous extraction of various cell parameters.
BIOPHYSICAL JOURNAL
(2022)
