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Assessment of ocular surface response to tinted soft contact lenses with different characteristics and pigment location Int. J. Optomechatron. (IF 0.818) Pub Date : 2021-01-19 Min-Yen Hsu; Pei-Yu Hong; Jyh-Cheng Liou; Yu-Ping Wang; Connie Chen
Abstract This study investigated the characteristics and location of the pigment layer of commercially available tinted contact lenses and evaluated ocular surface properties. The rub-off test and anterior segment Fourier-domain optical coherence tomography were used to analyze the pigment layer of the lenses. They also completed a rating questionnaire of subjective symptom perception after wearing
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Progress in wafer bonding technology towards MEMS, high-power electronics, optoelectronics, and optofluidics Int. J. Optomechatron. (IF 0.818) Pub Date : 2021-01-02 Jikai Xu; Yu Du; Yanhong Tian; Chenxi Wang
Abstract Wafer bonding is an attractive technology that can join homo/heterogeneous materials into one composite. It has a wide range of applications in the micro-electro-mechanical system (MEMS), integrated circuit, consumer and power electronics, micro/nanofluidics, etc. Since all devices on the same wafer are sealed and tested at wafer size, it brings lots of benefits compared with the component-level
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Precision control of miniature SCARA robots for multi-object spectrographs Int. J. Optomechatron. (IF 0.818) Pub Date : 2020-12-10 Luzius Kronig; Philipp Hörler; Stefane Caseiro; Loic Grossen; Ricardo Araujo; Jean-Paul Kneib; Mohamed Bouri
Abstract Advances in astronomy led to the demand for measuring the spectra of multiple night sky objects simultaneously. Some of these Multi-Object Spectrographs use robotic systems that position optical fibers in the focal plane of the observing telescope. These systems rely on precise fiber placement in order to collect the light spectra of faint stars and galaxies. Here, we present how to design
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Reconfigurable metamaterials for optoelectronic applications Int. J. Optomechatron. (IF 0.818) Pub Date : 2020-12-08 Yu-Sheng Lin; Zefeng Xu
Abstract In recent years, electromagnetic characteristics of metamaterials has aroused great interest because of innovative fundamental understanding as well as promising potential applications in optics, semiconductors, imaging, and sensing. We survey the state-of-the-art of spatially reconfigurable metamaterials in which electromagnetic Lorentz, Coulomb, and Ampere forces, as well as optical signals
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Fuzzy logic based feedback control system for the frequency stabilization of external-cavity semiconductor lasers Int. J. Optomechatron. (IF 0.818) Pub Date : 2020-12-01 Yang Wang; Xiaoyan Wu; Yuhang Wang; Xiaoping Zhou
Abstract This paper proposes an intelligent approach (fuzzy logic) for the design of external-cavity semiconductor lasers (ECLs) for better disturbance rejection. As a kind of nonlinear optical system, ECL output frequency is difficult to be stabilized by conventional methods. The fuzzy logic algorithm is preferred for ECLs stabilization, which could update parameters automatically. Suddenability to
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The study on surface integrity on laser-assisted turning of SiCp/2024Al Int. J. Optomechatron. (IF 0.818) Pub Date : 2020-08-06 Changtai Zhai; Jinkai Xu; Yiquan Li; Yonggang Hou; Shuaishuai Yuan; Qimeng Liu; Xu Wang
Abstract The study investigates the effects of variables of laser-assisted turning (LAT) and conventional turning (CT) on machining performance of 45% volume fraction silicon carbide particle reinforced 2024 aluminum matrix composites (45 vol.% SiCp/2024Al). The process benefits of laser processing variables were analyzed by comparing the surface roughness, surface microstructure and residual stress
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All-fiber Mach–Zehnder comb filter based on tapered fibers for wavelength switchable erbium-doped fiber lasers Int. J. Optomechatron. (IF 0.818) Pub Date : 2020-08-04 He Wei; Zhu Lianqing; Dong Mingli
Abstract A wavelength switchable erbium-doped fiber laser was constructed based on an all-fiber Mach–Zehnder interferometer (MZI) comb filter. The MZI consisted of a fiber with two tapers. An L-band erbium-doped fiber was used as the gain medium, and 1557.92, 1563.2, and 1568.06 nm single-wavelength and dual-wavelength switchable lasers at 1558, 1563.7, and 1570.2 nm were realized by adjusting the
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Simultaneous multi-dimensional spatial frequency modulation imaging Int. J. Optomechatron. (IF 0.818) Pub Date : 2020-01-06 Nathan Worts; John Czerski; Jason Jones; Jeffrey J. Field; Randy Bartels; Jeff Squier
Abstract One of the primary challenges in advanced manufacturing (AM) is the lack of efficient optical metrics for ensuring quality control over the manufacturing process. Many current imaging techniques have excessive data requirements and require computationally intensive post-processing to effectively characterize various AM environments. Spatial frequency modulated imaging (SPIFI) addresses many
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Silk fibroin and ultra-long silver nanowire based transparent, flexible and conductive composite film and its Temperature-Dependent resistance Int. J. Optomechatron. (IF 0.818) Pub Date : 2019-08-02 Xiangzheng Qin, Yu Peng, Piaopiao Li, Kai Cheng, Zhenzhong Wei, Ping Liu, Ning Cao, Junyi Huang, Jinjun Rao, Jinbo Chen, Tao Wang, Xiaomao Li, Mei Liu
A transparent, conductive, smooth, and temperature sensitive thin films was fabricated and characterized in this paper. Silk fibroin could be processed into transparent thin films, which can act as ideal opto-electronic substrates. As pure silk fibroin film is nonconductive, ultra-long silver nanowires coating and platinum sputtering were used to strengthen its conductivity. Ultra-long nanowires were
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Binocular microlens imaging system based on micro fabrication technology and its application in vein-enhanced display Int. J. Optomechatron. (IF 0.818) Pub Date : 2019-07-03 Si Di, Jian Jin
Vein display device can significantly increase the success rate of intravenous injection. However, traditional vein display devices only contain near-infrared image information, which inevitably loses skin color information. In this article, a binocular microlens was fabricated by micro-fabrication technology. Then, a smart binocular microlens imaging system is set up. By this system, the near-infrared
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Modeling and evaluation of magnetic fluid deformable mirror with dual-layer actuators Int. J. Optomechatron. (IF 0.818) Pub Date : 2019-04-23 Zhu Zhang, Xiang Wei, Zhizheng Wu, Gunner Scott, Yuanyuan Wang, Mei Liu, Merveilles Dziki
In this paper, a rectangular magnetic fluid deformable mirror (MFDM) with dual-layer actuators is proposed, which is designed to improve the correction performance for full-order aberrations. Compared with the conventional adaptive optics system that uses two mirrors to configure as a woofer–tweeter system, the proposed MFDM combines the two mirrors into one by using a two-layer layout design of the
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Laser-dilatometer calibration using a single-crystal silicon sample Int. J. Optomechatron. (IF 0.818) Pub Date : 2019-04-16 Ines Hamann, Josep Sanjuan, Ruven Spannagel, Martin Gohlke, Gudrun Wanner, Sönke Schuster, Felipe Guzman, Claus Braxmaier
Marginal changes in geometrical dimensions due to temperature changes affect the performance of optical instruments. Highly dimensionally stable materials can minimize these effects since they offer low coefficients of thermal expansion (CTE). Our dilatometer, based on heterodyne interferometry, is able to determine the CTE in 10−8 K−1 range. Here, we present the improved interferometer performance
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Flatness measurement of large flat with two-station laser trackers Int. J. Optomechatron. (IF 0.818) Pub Date : 2018-12-31 Jie Li, Jie Yang, Shibin Wu, Xuedong Cao
We present a novel method to accurately measure the flatness of a large flat. The method can be seen as a task-specific error correction of the laser tracker. Laser trackers are positioned at two specific measuring stations and measure the coordinates of the same sample points. The angular errors of the primary laser tracker are compensated with constraint information provided by an additional laser
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Fabrication of 3D nano-hemispherical cavity array plasmonic substrate for SERS applications Int. J. Optomechatron. (IF 0.818) Pub Date : 2018-11-22 Chu-Yu Huang, Ming-Shiuan Tsai
Surface-enhanced Raman scattering (SERS) have numerous applications in areas such as analytical chemistry, biochemistry, and environmental science. However to manufacture SERS active substrates with good reproducibility and low cost is not easy, which hinder the SERS technology from being widespread in various applications. In this study, we developed a batch producible hot embossing 3D nanostructured
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Wavelength switchable and stable single-longitudinal-mode erbium-doped fiber laser based on Mach–Zehnder interferometer and tunable filter Int. J. Optomechatron. (IF 0.818) Pub Date : 2018-08-06 Wei He, Lianqing Zhu, Mingli Dong, Fei Luo
An erbium-doped fiber laser with all-fiber Mach–Zehnder interferometer (MZI) and tunable filter was proposed and experimentally demonstrated. In the designed fiber laser, 6 m C-band erbium-doped fiber was selected as a gain medium; the MZI comprised two waist-enlarged fiber bitapers. In the experiment, the laser threshold was 93 mW, whereas a switchable single-longitudinal-mode laser was realized within
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Dynamic response of ferrofluidic deformable mirrors using elastomer membrane and overdrive techniques Int. J. Optomechatron. (IF 0.818) Pub Date : 2018-06-14 Maxime Rochette, Ermanno F. Borra, Jean-Philippe Déry, Anna M. Ritcey
The experimental results obtained with a ferrofluidic deformable mirror controlled by electro-magnet actuators are presented here. Using a step input through a single actuator, we obtained a steady-state settling time of 100 ms; however, different combinations of overdrive inputs can be used to decrease it to 25 ms. A new technique which consists of laying down an elastomer membrane, coated with an
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Rigorous simulation of nonlinear optomechanical coupling in micro- and nano-structured resonant cavities Int. J. Optomechatron. (IF 0.818) Pub Date : 2018-06-04 Matteo Stocchi, Davide Mencarelli, Yan Pennec, Bahram Djafari-Rouhani, Luca Pierantoni
A numerical method aimed to predict the optomechanical dynamics in micro- and nano-structured resonant cavities is introduced here. The rigorousness of it is ensured by exploiting the harmonic version of the transformation optics (TO) technique and by considering all the energy-transduction contributions of electrostriction, radiation pressure, photoelasticity and moving boundaries. Since our full-wave
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High-resolution optical inspection system for fast detection and classification of surface defects Int. J. Optomechatron. (IF 0.818) Pub Date : 2018-05-09 Ruifang Ye, Ming Chang, Chia-Sheng Pan, Cheng An Chiang, Jacque Lynn Gabayno
A high-resolution automated optical inspection (AOI) system based on parallel computing is developed to achieve fast inspection and classification of surface defects. To perform fast inspection, the AOI apparatus is connected to a central computer which executes image processing instructions in a graphical processing unit. Defect classification is simultaneously implemented with Hu’s moment invariants
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In situ monitoring of photostriction in chalcogenide glass film using fiber Bragg grating sensors Int. J. Optomechatron. (IF 0.818) Pub Date : 2017-12-19 Sivakumar Gayathri, G. Sreevidya Varma, Gagandeep Singh, Bannur Nanjunda Shivananju, S. Sridevi, Siva Umapathy, Sai Siva Gorthi, Sundarrajan Asokan
The reversible photostriction (photomechanical strain) in Ge35S65 chalcogenide thin film deposited by a solvent casting method has been monitored using a fiber Bragg grating (FBG) sensor. The shift in Bragg wavelength is used as a probing parameter to quantitatively measure the photoinduced strain arising because of structural modifications in these films under illumination. Exposure to band gap light
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Hyperspectral photoacoustic spectroscopy of highly-absorbing samples for diagnostic ocular imaging applications Int. J. Optomechatron. (IF 0.818) Pub Date : 2017-12-19 Hoong-Ta Lim, Vadakke Matham Murukeshan
Photoacoustic spectroscopy has been used to measure optical absorption coefficient and the application of tens of wavelength bands in photoacoustic spectroscopy was reported. Using optical methods, absorption-related information is, generally, derived from reflectance or transmittance values. Hence measurement accuracy is limited for highly absorbing samples where the reflectance or transmittance is
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Fabrication of high quality factor lithium niobate double-disk using a femtosecond laser Int. J. Optomechatron. (IF 0.818) Pub Date : 2017-12-19 Zhiwei Fang, Ni Yao, Min Wang, Jintian Lin, Jianhao Zhang, Rongbo Wu, Lingling Qiao, Wei Fang, Tao Lu, Ya Cheng
We demonstrate fabrication of a high-quality factor lithium niobate double-disk whispering-gallery microcavity using femtosecond laser assisted ion beam milling. Using this method, two vertically stacked 30-µm diameter disks with a 200-nm gap are fabricated. With our device, an optical quality factor as high as 1.35 × 105 is demonstrated. Our approach is scalable to fabricate multiple disks on a single
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Micromirror-based real image laser automotive head-up display Int. J. Optomechatron. (IF 0.818) Pub Date : 2017-10-11 Chao Fan, Siyuan He
This paper reports a micromirror-based real image laser automotive head-up display (HUD), which overcomes the limitations of the previous designs by: (1) implementing an advanced display approach which is able to display sharp corners while the previous designs can only display curved lines such as to improve the display fidelity and (2) Optimizing the optical configuration to significantly reduce
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Multiview registration-based handheld 3D profiling system using visual navigation and structured light Int. J. Optomechatron. (IF 0.818) Pub Date : 2017-04-13 Shirazi Muhammad Ayaz, Min Young Kim
This article describes the 3D handheld profiling system composed of a stereo camera and an illumination projector to collect high-resolution data for close range of applications. Visual navigation approach is either based on feature matching or on accurate target, and the target-based approach was found to be more accurate if the 3D object has less texture on its surface. Block matching algorithm was
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Editorial Board EOV Int. J. Optomechatron. (IF 0.818) Pub Date : 2016-11-08
(2016). Editorial Board EOV. International Journal of Optomechatronics: Vol. 10, No. 3-4, pp. ebi-ebi.
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Generating selected color using RGB, auxiliary lights, and simplex search Int. J. Optomechatron. (IF 0.818) Pub Date : 2016-09-30 HyungTae Kim, Seung Taek Kim, Jongseok Kim, KyungChan Jin, Hong-Seok Kim
A mixed light source generates various colors with the potential to adjust the intensities of multiple LEDs, which makes it possible to generate arbitrary colors. Currently, PCs and OSs provide color selection windows that can obtain the red, green, and blue (RGB) or hue, saturation, and lightness (HSL) color coordinates of a user’s selection. Mixed light sources are usually composed of primary-colored
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Tool removal function modeling and processing parameters optimization for bonnet polishing Int. J. Optomechatron. (IF 0.818) Pub Date : 2016-09-30 Yunpeng Feng, Hengyu Wu, Haobo Cheng
Since computer controlled optical surfacing (CCOS) processes were proposed in the 1960s, many processes were developed for precision optics successfully. In this present work, a novel approach, the precessions process, is proposed and used for large segments fabrication. The removal function of the bonnet polisher based on velocity and pressure distribution, which are obtained from the geometry of
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A 1.8-µm multiwavelength thulium-doped fiber laser based on a hybrid interference filter Int. J. Optomechatron. (IF 0.818) Pub Date : 2016-09-09 He Wei, Zhu Lianqing, Dong Mingli, Luo Fei
A 1.8-µm tunable multiwavelength thulium-doped fiber laser based on a hybrid filter is proposed. In the designed ring-cavity fiber laser, the filter consists of one Sagnac loop and one dual-pass Mach–Zehnder filter. In the experiment, the lasing threshold is 155 mW, and a continuously tunable and stable single-wavelength laser could be realized with a minimum tuning interval of 2.1 nm within a scope
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Resist-free processing of graphene merging optical imaging and classification with scanning probe lithography Int. J. Optomechatron. (IF 0.818) Pub Date : 2016-09-08 Sören Zimmermann, Alexander van Duellen, Markus Wieghaus, Sergio Alfredo Garnica Barragán, Sergej Fatikow
Resist based lithographical techniques are widely applied for graphene processing. These resists can leave residues leading to parasitic effects that deteriorate the desired properties of graphene. This paper presents an experimental setup tailored for resist-free robotic processing of graphene with in-situ vision based control. A robust graphene detection and classification approach is presented applying
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Theoretical investigation on nanoparticle concentrations in optoelectrofluidic chip based on diffusion, convection, and migration Int. J. Optomechatron. (IF 0.818) Pub Date : 2016-09-08 Sheng Hu, Jiangtao Lv, Guangyuan Si
A numerical model and simulation relative to an optoelectrofluidic chip has been presented in this article. Both dielectrophoretic and electroosmotic force attracting the nano-sized particles could be studied by the diffusion, convection, and migration equations. For the nano-sized particles, the protein with radius 3.6 nm is considered as the objective particle. The electroosmosis dependent upon applied
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Linear encoder based low frequency inertial sensor Int. J. Optomechatron. (IF 0.818) Pub Date : 2016-09-08 Sylvain Hellegouarch, Lionel Fueyo Roza, Kurt Artoos, Pierre Lambert, Christophe Collette
In this article, we present a novel concept of inertial sensor, based on a linear encoder. Compared to other interferometric sensors, the encoder is much more easy to mount, and the calibration more stable. A prototype has been built and validated experimentally by comparison with a commercial seismometer. It has a resolution of about 10 pm/√Hz. In order to further improve the resolution, two concepts
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Development of an optical inspection platform for surface defect detection in touch panel glass Int. J. Optomechatron. (IF 0.818) Pub Date : 2016-04-28 Ming Chang, Bo-Cheng Chen, Jacque Lynn Gabayno, Ming-Fu Chen
An optical inspection platform combining parallel image processing with high resolution opto-mechanical module was developed for defect inspection of touch panel glass. Dark field images were acquired using a 12288-pixel line CCD camera with 3.5 µm per pixel resolution and 12 kHz line rate. Key features of the glass surface were analyzed by parallel image processing on combined CPU and GPU platforms
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MRI-based dynamic tracking of an untethered ferromagnetic microcapsule navigating in liquid Int. J. Optomechatron. (IF 0.818) Pub Date : 2016-04-05 Christian Dahmen, Karim Belharet, David Folio, Antoine Ferreira, Sergej Fatikow
The propulsion of ferromagnetic objects by means of MRI gradients is a promising approach to enable new forms of therapy. In this work, necessary techniques are presented to make this approach work. This includes path planning algorithms working on MRI data, ferromagnetic artifact imaging and a tracking algorithm which delivers position feedback for the ferromagnetic objects, and a propulsion sequence
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Fiber Bragg grating demodulation through innovative numerical procedures Int. J. Optomechatron. (IF 0.818) Pub Date : 2016-03-30 Giuseppe Dinardo, Gaetano Vacca
The aim of this article is to introduce an innovative algorithm for the calculation of the shift of the maximum reflectivity wavelength of a Fiber Bragg Grating experiencing an applied strain. An accurate and precise evaluation of the FBG spectrum displacement is crucial for determining the amount of the physical quantity inducing such perturbations. The proposed method is based on the Fast Fourier
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The influence of lateral forces on the cell stiffness measurement by optical tweezers vertical indentation Int. J. Optomechatron. (IF 0.818) Pub Date : 2016-03-18 Fatou Ndoye, Muhammad Sulaiman Yousafzai, Giovanna Coceano, Serena Bonin, Giacinto Scoles, Oumar Ka, Joseph Niemela, Dan Cojoc
We studied the lateral forces arising during the vertical indentation of the cell membrane by an optically trapped microbead, using back focal plane interferometry to determine force components in all directions. We analyzed the cell-microbead interaction and showed that indeed the force had also lateral components. Using the Hertz model, we calculated and compared the elastic moduli resulting from
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Optical trapping of nanoparticles on a silicon subwavelength grating and their detection by an ellipsometric technique Int. J. Optomechatron. (IF 0.818) Pub Date : 2016-02-12 Naoya Taki, Yasuhiro Mizutani, Tetsuo Iwata, Takao Kojima, Hiroki Yamamoto, Takahiro Kozawa
A method and setup are proposed for trapping and detecting nanoparticles dispersed in a nanocomposite solution using periodically localized light generated by a subwavelength transmission grating. By numerical simulations, it is shown that there is an optimum duty ratio of the grating to produce the periodically localized light. Experimental results are presented for Au/γ-Fe2O3 composite nanoparticles
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Opto-acoustic phenomena in whispering gallery mode resonators Int. J. Optomechatron. (IF 0.818) Pub Date : 2016-01-21 Guoping Lin, Yanne K. Chembo
Optical whispering gallery mode resonators are important platforms to enhance and study various nonlinear frequency conversion processes. Stimulated Brillouin scattering is one of the strongest nonlinear effects, and can be successfully investigated using these platforms. In this article, we study the phenomenon of stimulated Brillouin scattering using a crystalline disk resonator. A fast scanning