Article
Optics
Clement Deleau, Han Cheng Seat, Olivier Bernal, Frederic Surre
Summary: In this study, a high-sensitivity integrated silicon nitride long period grating (LPG) refractometer based on a rib waveguide with sinusoidally modulated width is demonstrated. The sensor exhibits a very high refractometric sensitivity that remains constant over a broad spectral range and also has low temperature sensitivity and a simple fabrication process. These results demonstrate the feasibility of achieving both high sensitivity and a large dynamic range of the proposed refractometer through chip-scale photonic integration.
PHOTONICS RESEARCH
(2022)
Article
Multidisciplinary Sciences
Farhad Sattari, Soghra Mirershadi
Summary: Using the transfer matrix approach, the authors investigated the optical properties of a one-dimensional photonic crystal based on CH3NH3PbI3 perovskite. By incorporating a monolayer MoS2 film, the absorbance at longer wavelengths was increased. Increasing the number of periods enhanced the absorbance in most wavelengths, and the oscillatory behavior of the absorbance, transmittance, and reflectance became more prominent. The proposed structure holds potential for optoelectronic and optical devices, such as improving the efficiency of solar cells and infrared sensors.
SCIENTIFIC REPORTS
(2023)
Article
Optics
Clement Deleau, Han Cheng Seat, Olivier Bernal, Frederic Surre
Summary: This Letter proposes a theoretical analysis and design methodology for integrated long period gratings (LPGs) in refractometric applications. A detailed parametric analysis is applied to a LPG model based on two strip waveguides to investigate the main design variables and their impact on refractometric performances, specifically spectral sensitivity and signature response. Simulations of four variants of the same LPG design using eigenmode expansion demonstrate a wide range of sensitivities up to 300,000 nm/RIU and figures of merit (FOMs) as high as 8000.
Article
Optics
A. Gassenq, H. -S Nguyen, E. Cleyet-Merle, S. Cueff, A. Pereira
Summary: In this study, a fully structured diffraction grating fabrication method has been developed using lift-off based processing combined with pulsed laser deposition, which allows etch-free production of high aspect ratio gratings. The results show that micrometric spatial resolution and controllable sidewall angles can be achieved using this technique. Er-doped Y2O3 uniaxial diffraction gratings with different periods were successfully fabricated, exhibiting a maximum 15-fold luminescence enhancement compared with an unstructured layer at a wavelength of 1.54 μm. This work highlights the potential of lift-off based processing combined with pulsed laser deposition for etch-free practical applications, such as luminescence enhancement in Er-doped layers.
Article
Optics
Alexandre Kelly-Richard, Jacques Albert
Summary: A multiresonant approach based on tracking 27 cladding mode resonances of tilted fiber Bragg grating refractometers is shown to improve the limit of detection by a factor of 3 to 4 relative to the conventional approach of tracking the single-most sensitive resonance. Limits of detection below 2 x 10(-5) in index change are achieved for dilutions of ethanol in water in repeated experiments. In all cases, wavelengths are referenced to the core mode resonance which eliminates the effect of small temperature changes during and between experiments. (C) 2022 Optica Publishing Group
Article
Optics
Hongqiang Li, Wentao Meng, Lu Cao, Lizhen Zhang, Yang Liu, Zhilin Lin, Ruina Zhao, Zhenya Song, Feng Ren, Shanshan Zhang, Liying Chen, Jinjun Bai, Mengwei Cao, Yingjie Wang, Zhiyue Zhu, Tianxue Gao, Enbang Li, Joan Daniel Prades
Summary: This paper proposes a polymer-based optical waveguide pressure sensor that can be used for medical diagnostics and health testing. The sensor has the advantages of low cost, low Young's modulus, and high sensitivity, and characterizes the change in pressure by measuring the change in Bragg wavelength.
Article
Materials Science, Multidisciplinary
Daoye Zheng, Yao Wen, Xiaocan Xu, Yu-Sheng Lin
Summary: We propose and demonstrate a metamaterial grating sensor composed of gold nanograting on a silver thin-film and encapsulated with a PDMS microfluidic chip. The sensor is sensitive to the wavevector of incident light and exhibits angle-dependent reflection spectra, with resonance peaks showing blue-shifts when isopropyl alcohol and deionized water solutions are injected. The reflected color also changes with different solutions in the ambient light environment.
MATERIALS TODAY PHYSICS
(2023)
Article
Multidisciplinary Sciences
Keivan Mahmoud Aghdami, Abdullah Rahnama, Erden Ertorer, Peter R. Herman
Summary: This study explores the use of ultrashort-pulsed laser filaments to create high density arrays of laser filamented holes in optical fiber, resulting in high refractive index contrast Bragg gratings for telecommunications. The technique combines point-by-point fabrication with post-chemical etching to engineer strong photonic stopbands directly inside the compact and flexible fiber, allowing for high resolution refractive index sensing.
NATURE COMMUNICATIONS
(2021)
Article
Optics
J. I. A. B. I. N. Wang, A. N. Z. H. Wang, X. I. N. G. Y. U. Yang, S. H. E. N. G. J. I. A. Wang, X. I. N. Z. H. E. Zeng, J. I. A. Y. U. Hao, J. I. A. N. Zhou, Y. A. N. R. U. Kou, C. H. O. N. G. Niu, T. A. O. Geng, W. E. I. M. I. N. Sun
Summary: This paper proposes a new design framework of long-period fiber grating (LPFG) sensors resistant to multi-parameter cross talk. By merging a section of hollow quartz capillary (HQC) with a single-mode fiber (SMF) periodically, the proposed device is able to resist cross talk among the strain, ambient refractive index, and vector bending. The novel Es-LPFG is promising in single-parameter sensing, mode-locked lasers, and frequency-locked gain flattening.
Article
Optics
Shen Liu, Min Zhou, Zhe Zhang, Zhongyuan Sun, Zhiyong Bai, Yiping Wang
Summary: We demonstrate a dual-resonance helical long-period fiber grating (HLPFG) with ultrahigh refractive index sensitivity for precise measurement of liquids. The HLPFG exhibits an ultrahigh refractive index sensitivity near the dispersion turning point and achieves sensitivity more than one order of magnitude higher than a conventional HLPFG. It also shows minimal wavelength shifts with temperature and strain, making it a potential candidate for low-cross-talk sensors.
Article
Biochemical Research Methods
Wenjie Li, Yinping Miao, Tuan Guo, Kialiang Zhang, Jianquan Yao
Summary: The optofluidic system based on photothermal spectroscopy combines molecular photothermal effect with Nb2CTx MXene-tilted fiber Bragg grating for the detection of organophosphorus pesticides with temperature compensation. The sensitivity reaches 1.8 pm/ppm with a limit of detection of 0.35 ppm, demonstrating the potential of this system in various fields such as medicine, chemistry, and environmental monitoring.
BIOMEDICAL OPTICS EXPRESS
(2021)
Article
Optics
Simon L. Christensen, Mattia Michieletto, Mette M. Johansen, Martin D. Maack, Jesper Laegsgaard
Summary: This study reports a novel analysis method for high power rod fiber amplifiers by monitoring the cross-polarization of the output. Spatially and temporally resolved imaging of co- and cross-polarizations at high power amplification reveals dynamic eigenmode behavior of the rod fiber, caused by a moving refractive index grating written by the modal interference pattern of transverse mode instability.
Article
Materials Science, Multidisciplinary
Zhengfeng Guo, Honggang Gu, Mingsheng Fang, Baokun Song, Wei Wang, Xiuguo Chen, Chuanwei Zhang, Hao Jiang, Lin Wang, Shiyuan Liu
Summary: The study quantitatively confirmed the giant optical anisotropy of ZrTe5 for the first time using Mueller matrix spectroscopic ellipsometry and revealed the physical mechanism through first-principle calculations. ZrTe5 exhibits significant dispersive birefringence and dichroism, showing potential in fabricating miniature and integrated polarization-sensitive devices.
ACS MATERIALS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Sourabh Sahu, Nitesh Mudgal, Ankit Agrawal, Ghanshyam Singh
Summary: This research paper presents the design and simulation of an optical biosensor using a ring resonator with strip and subwavelength grating waveguides. The biosensor aims to work in low-loss regions and prevent bending losses. Simulation analysis is performed to observe the sensing parameters. The biosensor can detect changes in resonant wavelength caused by changes in refractive index, making it suitable for a wide range of biosensing applications.
JOURNAL OF SENSORS
(2023)
Article
Optics
Shambhu Kumar, Jitendra Bahadur Maurya, Bita Roumi, Reza Abdi-Ghaleh, Yogendra Kumar Prajapati
Summary: In this paper, a D-shaped optical fiber plasmonic sensor using planar and grating structures of silver and gold metals is simulated. Performance of the sensor is evaluated based on the transmittance curve and electric field distribution of a surface plasmon wave. The results show that gold has a wider bandwidth than silver, but it decreases the detection accuracy, while gold has a higher shift in resonance wavelength, which improves sensor performance and enhances sensitivity.
Article
Chemistry, Multidisciplinary
Tina Sabel
APPLIED SCIENCES-BASEL
(2015)
Article
Polymer Science
Tina Sabel
Article
Materials Science, Multidisciplinary
Tina Sabel, Susanna Orlic, Karl Pfeiffer, Ute Ostrzinski, Gabi Gruetzner
OPTICAL MATERIALS EXPRESS
(2013)
Article
Chemistry, Multidisciplinary
Tina Sabel, Michael Zschocher
Applied Sciences-Basel
(2014)
Article
Materials Science, Multidisciplinary
Tina Sabel, Michael Zschocher
MATERIALS RESEARCH LETTERS
(2014)
Article
Biochemistry & Molecular Biology
Tina Sabel
Article
Materials Science, Multidisciplinary
Tina Sabel, Gonzalo de Vicente Lucas, Marga C. Lensen
MATERIALS RESEARCH LETTERS
(2019)
Article
Polymer Science
Tina Sabel-Grau
Summary: This article presents detailed investigations of holographic recording in a new organic material, revealing the influence of material composition, processing, exposure conditions, and pre-exposure on the development and final characteristics of holographic gratings. Through time-resolved and spatially resolved analyses, the effects of pre-exposure on grating formation and refractive index contrast are determined. Unexpected effects are also observed.
Article
Polymer Science
Tina Sabel-Grau, Arina Tyushina, Cigdem Babalik, Marga C. Lensen
Summary: The study explores the application of poly(ethylene glycol)-diacrylate (PEG-DA) hydrogels with different photoinitiators in biomedical materials, achieving multifunctionality through adjustment of photoinitiator concentrations. Hydrogel films capable of light-based patterning were obtained, allowing for functionalization of surface and volume with potential applications.
