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Junliang Jia, Qichang Li, Kepeng Zhang, Dongxu Chen, Chenhui Wang, Hong Gao, Fuli Li, Pei Zhang
Transverse modes of light have been widely exploited in both classical and quantum optics in recent years. Among the devices to manipulate the transverse modes of light, a π/2 converter is a fundamental and important one that analogs to the quarter-wave plate in the polarization degree of freedom. While a π/2 converter is typically achieved by a pair of well-adjusted cylindrical lenses, it suffers from complexity in its installation and adjustment, which strongly limits its practical applications. In this paper an integrated design of a π/2 converter is reported...
July 20, 2018: Applied Optics
Lin Wang, Yungang Zhang, Xue Zhou, Zhiguo Zhang
This paper investigated a potential instrument for carbon disulfide in situ measurement with high precision and strong anti-interference capability. A compact and automated carbon disulfide detection system was developed using a fiber opto-electronic sensing device. A custom software interface based on LabVIEW was developed. The multi-wavelength least-squares method based on differential optical absorption spectroscopy was employed for improved detection and the anti-interference capabilities of the system...
July 20, 2018: Applied Optics
Gencheng Wang, Tingge Dai, Jianfei Jiang, Xiaoqing Guo, Bei Chen, Yuehai Wang, Hui Yu, Xiaoqing Jiang, Jianyi Yang
In this paper, we propose integrated one-dimensional (1D) grating waveguide-based true-time delay (TTD) lines on a silicon-on-insulator (SOI) platform. Through optimizing the structure of the proposed waveguide, a time delay of 77.23 ps/mm can be readily achieved in a wavelength tuning range from 1540.20 nm to 1558.97 nm. Compared to conventional photonic crystal waveguide-based TTDs, the proposed waveguide occupies 70% less chip surface and has much lower propagation loss when compared with 2D photonic crystal devices...
June 20, 2018: Applied Optics
S Iadanza, A P Bakoz, P K J Singaravelu, D Panettieri, S A Schulz, G C R Devarapu, S Guerber, C Baudot, F Boeuf, S Hegarty, L O'Faolain
In this paper, we show the experimental results of a thermally stable Si3 N4 external cavity (SiN EC) laser with high power output and the lowest SiN EC laser threshold to our knowledge. The device consists of a 250 μm sized reflective semiconductor optical amplifier butt-coupled to a passive chip based on a series of Si3 N4 Bragg gratings acting as narrow reflectors. A threshold of 12 mA has been achieved, with a typical side-mode suppression ratio of 45 dB and measured power output higher than 3 mW. Furthermore, we achieved a mode-hop free-lasing regime in the range of 15-62 mA and wavelength thermal stability up to 80°C...
August 1, 2018: Applied Optics
Longfang Ye, Kehan Sui, Yanhui Liu, Miao Zhang, Qing Huo Liu
In this paper, a graphene-based hybrid plasmonic waveguide is proposed for highly efficient broadband surface plasmon polariton (SPP) propagation and modulation at mid-infrared (mid-IR) spectrum. The hybrid plasmonic waveguide is composed of a monolayer graphene sheet in the center, a polysilicon gating layer, and two inner dielectric buffer layers and two outer parabolic-ridged silicon substrates symmetrically placed on both sides of the graphene. Owing to the unique parabolic-ridged waveguide structure, the light-graphene interaction and subwavelength SPPs confinement of the fundamental SPP mode for the hybrid waveguide can be significantly increased...
June 11, 2018: Optics Express
Richard A Soref, Francesco De Leonardis, Vittorio M N Passaro
This theoretical modeling-and-simulation paper presents designs and projected performance of ~1500-nm silicon-on-insulator 2 x 2 Mach-Zehnder interferometer (MZI) optical crossbar switches and tunable filters that are actuated by thermo-optical (TO) means. A TO heater stripe is assumed to be on the top of each waveguided arm in the interferometer. Each strip-waveguide arm contains an inline set of N-fold coupled, phase-shifted Bragg-grating resonators. To implement accurate and realistic designs, a mixed full-vectorial mathematical model based upon the finite-element, coupled-mode, and transfer-matrix approaches was employed...
June 11, 2018: Optics Express
Shixiang Wang, Chifai Cheung, Mingjun Ren, Mingyu Liu
There are still significant challenges in the accurate positioning of optical freeform surfaces on the machine tool and the measurement instrument due to the high accuracy requirement and their complex shapes. This paper proposes a Fiducial-aided On-machine Positioning method (FAOPM) that combines on-machine measurement and off-machine measurement to precisely position optical freeform surfaces during the precision manufacturing cycle including rough machining, fine machining, measurement, and error compensation...
July 23, 2018: Optics Express
Zheng Xiong, Hua Liu, Ronghuan Chen, Jia Xu, Qiankun Li, Jinhuan Li, Wenjuan Zhang
Illumination uniformity in photolithography systems determines the dimensional difference across the entire lithographic substrate. However, traditional lithography system relies on expensive and complex illumination system for achieving uniform illumination. In this paper, we propose a simple and cost-effective method based on the modulation of digital micromirror device to improve illumination uniformity. The modulation according to a digital mask achieved via an iteration program improves the uniformity to be above 95%...
July 9, 2018: Optics Express
Shen Zheng, Chao Li, Shichao Li, Xiaojuan Zhang, Guangyou Fang
In this paper, an approach to achieve wide-angle beam scanning in the terahertz (THz) band with frequency sweeping was proposed based on a metasurface structure. To widen the scanning angular scope, a coherent enhancement mechanism for improving the mode competition efficiency of the high-order diffraction mode was first implemented. A systematic method was firstly developed for the design of practical frequency-controlled beam scanning quasi-optics in THz band, in which the optimization of scanning range, linearity, and the avoidance of beam blocking are comprehensively considered...
July 9, 2018: Optics Express
Mu-Chieh Lo, Robinson Guzmán, Guillermo Carpintero
In this paper, a monolithically integrated ∼1.55 µm semiconductor laser in the fourth harmonic colliding pulse mode locking configuration is reported. This device was developed within a multi-project wafer run at an InP-based active-passive generic foundry. The 1.66-mm Fabry-Pérot cavity is formed with two on-chip reflector building blocks rather than cleaved facets. In the cavity, three absorber sections symmetrically divide the cavity in four gain segments. This laser diode is able to emit 100-GHz pulse trains with 500-fs pulse duration as well as two-tone emissions with a frequency separation of 2...
July 9, 2018: Optics Express
Youhao Jiang
Starting from the research on the whole life cycle management of medical equipment, based on the development and application of HRP management system, according to the characteristics of medical device management, this paper studies the specific implementation method of medical device life cycle management based on HRP system. Then, it provides an asset management solution of decision, management and operation for the decision, management and executive layer of the hospital.
July 30, 2018: Zhongguo Yi Liao Qi Xie za Zhi, Chinese Journal of Medical Instrumentation
Jian Xiang, Lifeng Yang, Shenghui Tian, Suilan Cao, Lin Yan
Biological tests of medical devices is an important part to evaluate its biological safety. Good quality management of the test is a powerful guarantee to ensure the authenticity, integrity and reliability of the test results. This paper is based on the biological tests of medical devices, compares GLP and ISO/IEC 17025 which is widely used in China medical device testing institutions, describes the implementation of the GLP reference points to strengthen the quality management of biological tests of medical devices under the ISO/IEC 17025 system, to provide reference for quality management of medical device testing institutions...
July 30, 2018: Zhongguo Yi Liao Qi Xie za Zhi, Chinese Journal of Medical Instrumentation
Zhijin Fan, Neng Xie
This paper summarizes the current research status of 3D printed customized medical devices regulations in US and EU. Based on the discussion of 3D printed customized medical devices in the US and the European Union, some thoughts are put forward from design, manufacturing, testing and other aspects.
July 30, 2018: Zhongguo Yi Liao Qi Xie za Zhi, Chinese Journal of Medical Instrumentation
Filippo Pesapane, Caterina Volonté, Marina Codari, Francesco Sardanelli
Worldwide interest in artificial intelligence (AI) applications is growing rapidly. In medicine, devices based on machine/deep learning have proliferated, especially for image analysis, presaging new significant challenges for the utility of AI in healthcare. This inevitably raises numerous legal and ethical questions. In this paper we analyse the state of AI regulation in the context of medical device development, and strategies to make AI applications safe and useful in the future. We analyse the legal framework regulating medical devices and data protection in Europe and in the United States, assessing developments that are currently taking place...
August 15, 2018: Insights Into Imaging
Nai-Yuan Liu, Pinar Cay-Durgun, Tianmiao Lai, Mark Sprowls, Leslie Thomas, Mary Laura Lind, Erica Forzani
This paper introduces a wireless, solid-state, portable, and automated device capable of measuring the total ammonia [ammonia (NH3 ) and ammonium (NH4 + )] levels of fluids, including biological samples. This device reliably measures the total ammonia of biological samples (e.g., urine) faster than the current ammonia quantification techniques. Medical professionals typically estimate NH4+ levels using error-prone indirect measurement techniques (i.e., urine anion gap), which are time-consuming and are seldom suitable for periodic measurements...
2018: IEEE Journal of Translational Engineering in Health and Medicine
Chung-Hsien Kuo, Hung-Hsuan Chen, Hung-Chyun Chou, Ping-Nan Chen, Yu-Cheng Kuo
Improving the independent living ability of people who have suffered spinal cord injuries (SCIs) is essential for their quality of life. Brain-computer interfaces (BCIs) provide promising solutions for people with high-level SCIs. This paper proposes a novel and practical P300-based hybrid stimulus-on-device (SoD) BCI architecture for wireless networking applications. Instead of a stimulus-on-panel architecture (SoP), the proposed SoD architecture provides an intuitive control scheme. However, because P300 recognitions rely on the synchronization between stimuli and response potentials, the variation of latency between target stimuli and elicited P300 is a concern when applying a P300-based BCI to wireless applications...
2018: Computational Intelligence and Neuroscience
Saleem Aslam, Ju Wook Jang, Kyung-Geun Lee
Cognitive capabilities are indispensable for the Internet of Things (IoT) not only to equip them with learning, thinking, and decision-making capabilities but also to cater to their unprecedented huge spectrum requirements due to their gigantic numbers and heterogeneity. Therefore, in this paper, a novel unified channel management framework (CMF) is introduced for cognitive radio sensor networks (CRSNs), which comprises an (1) opportunity detector (ODR), (2) opportunity scheduler (OSR), and (3) opportunity ranker (ORR) to specifically address the immense and diverse spectrum requirements of CRSN-aided IoT...
August 14, 2018: Sensors
Andrew Adamatzky, Neil Phillips, Roshan Weerasekera, Michail-Antisthenis Tsompanas, Georgios Ch Sirakoulis
Belousov-Zhabotinsky (BZ) thin layer solution is a fruitful substrate for designing unconventional computing devices. A range of logical circuits, wet electronic devices, and neuromorphic prototypes have been constructed. Information processing in BZ computing devices is based on interaction of oxidation (excitation) wave fronts. Dynamics of the wave fronts propagation is programed by geometrical constraints and interaction of colliding wave fronts is tuned by illumination. We apply the principles of BZ computing to explore a geometry of street networks...
July 2018: Physical Review. E
Fan Zhang, Geng Ma, Yunqi Tao, Xiao Liu, Yixin Liu, Rui Li
The surface characteristics of fractured specimens are important in hydraulic fracturing laboratory experiments. In this paper, we present a three-dimensional (3D) scanning device assembled to study these surface characteristics. Cube-shaped rock specimens were produced in the laboratory and subjected to triaxial loading until the specimen split in two in a hydraulic fracturing experiment. Each fractured specimen was placed on a rotating platform and scanned to produce 3D superficial coordinates of the surface of the fractured specimen...
June 2018: Royal Society Open Science
Guanglou Zheng, Wencheng Yang, Craig Valli, Li Qiao, Rajan Shankaran, Mehmet A Orgun, Subhas Chandra Mukhopadhyay
Any proposal to provide security for Implantable Medical Devices (IMDs), such as cardiac pacemakers and defibrillators, has to achieve a trade-off between security and accessibility for doctors to gain access to an IMD, especially in an emergency scenario. In this paper, we propose a Finger-to-Heart (F2H) IMD authentication scheme to address this trade-off between security and accessibility. This scheme utilizes a patient's fingerprint to perform authentication for gaining access to the IMD. Doctors can gain access to the IMD and perform emergency treatment by scanning the patient's finger tip instead of asking the patient for passwords/security tokens thereby achieving the necessary trade-off...
August 10, 2018: IEEE Journal of Biomedical and Health Informatics
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