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- 2019
- Distributed optical fiber sensing
- Optical frequency domain reflection
- Polynomial regression algorithm
- Nonlinear tuning compensation
- Optoelectronic Information Science and Engineering
- Hebei University of Technology
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Radiology, Lasers, Nanoparticles and Prosthetics || 11. Neutron radiotherapy
摘要： Neutrons like protons are hadrons, however neutrons are uncharged. They are more difficult to produce, and because they are neutral, accelerators and magnets cannot be used for tuning their energy or steering the beam. Neutron irradiation requires a neutron source and a radiological shielding environment that are very different to those for charged particles. Among the various external radiation treatments of cancer, neutron radiation therapy is presently not often prescribed.
关键词： fast neutrons,RBE,Boron Neutron Capture Therapy,BNCT,linear energy transfer,Neutron radiotherapy,LET,relative biological effectiveness
更新于2025-09-16 10:30:52
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Optical Properties of Plasmonic Nanoantennas Based on Arrays of Interacting V-Shaped Structures in the Mid-IR Range
摘要： Polarization-selected IR transmission, IR re?ection, and IR absorption spectra of arrays of V -shaped gold structures are experimentally studied for various structure periods. To form a local region of the enhanced electromagnetic ?eld in subwavelength nanogaps, arrays with unit cells consisting of two V -shaped structures, facing each other by acute angles with gaps of 0, 50, 100 nm were also used. The results of comparison of spectral data with measurements of dimensional parameters using atomic-force microscopy and scanning electron microscopy are presented. The possibility of using the fabricated structures to achieve the e?ect of surface-enhanced IR absorption by quantum dots is shown.
关键词： linear dichroism,plasmon nanoantennas,surface-enhanced IR spectroscopy
更新于2025-09-16 10:30:52
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Study the Nonlinearity Characteristics of Organic-Semiconductor (CuPc) Prepared Via Pulsed Laser Deposition Technique with Different Thickness
摘要： The optical absorption spectrum, Photoluminesces, and non-linear optical properties for Copper Phthalocyanine (CuPc) thin films (150,300 and 450 nm) respectively have been investigated via pulsed laser deposition technique. The absorption spectrum indicted that there are two bands one in UV around 330 nm which called B-band and the second in Visible around 650nm which called Q-band. Photoluminescence spectrum related to deposit samples has been determined with different thicknesses. From closed and open aperture Z-scan data non-linear absorption coefficient and non-linear refractive index have been calculated respectively using He-Ne laser which have beam waist of (24.2 μm), wave-length of (632.8 nm) and Rayleigh thickness was 2.9 mm. Through dividing closed by open apertures, non-linear refractive index was calculated accurately. Finally, the study also showed the suitability of the deposited films as an optical limiter at the wavelength 632.8 nm.
关键词： Copper Phthalocyanine,Organic Semiconductor,Non-linear properties,Pulsed laser deposition
更新于2025-09-16 10:30:52
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Fundamentals and Applications of Nanophotonics || A dynamical, classical oscillator model for linear and nonlinear optics
摘要： In this chapter we will build and develop a self-consistent, classical oscillator model to describe linear and nonlinear optical interactions like refraction and frequency conversion in both centrosymmetric and noncentrosymmetric materials. In addition to being quite ubiquitous in all of physics, the classical oscillator model of matter is an enormously pedagogical tool that serves as a natural springboard to the description and understanding of quantum systems and leads to a rather detailed portrayal of all the dynamical factors that contribute to most linear and nonlinear optical phenomena. The method is endowed with causality as well as a natural degree of self-consistency that includes linear and nonlinear material dispersions, elements that are usually necessary to understand many of the subtleties of the interaction of light with matter. By way of examples, using this classical approach we will examine harmonic generation in bulk materials and in metal-based nanostructures. In centrosymmetric materials like metals (materials composed of molecules that lack a center of symmetry), second harmonic generation (SHG) arises mostly from nearly free, conduction electrons (nearly free because they are con?ned by the metal walls) and is due to a combination of spatial symmetry breaking (interfaces), the magnetic portion of the Lorentz force, and, to a lesser extent, the interaction of third harmonic (TH) and pump photons. By the same token, the third order nonlinearity (c(3)) gives rise to most of the TH signal, while to a small degree the interaction of pump and SH photons also produces cascaded, TH photons. The classical oscillator model will be pivotal in these systems as well, where a combination of free (Drude) and bound (Lorentz) electrons suf?ces to describe most linear and nonlinear optical phenomena.
关键词： Lorentz model,centrosymmetric materials,noncentrosymmetric materials,classical oscillator model,harmonic generation,linear and nonlinear optics,Drude model
更新于2025-09-16 10:30:52
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Editorial: Lasers in Accelerator Science and Secondary Emission Light Source Technology
摘要： Unifying laser and accelerator physics holds great promise for the development of future particle accelerators, light sources, and other scienti?c instruments due to increasingly synergistic advances at the cross section between these two ?elds. Their combined action has recently ushered in advanced accelerator facilities around the world that have enabled unique scienti?c and technological breakthroughs: from advanced electron and ion sources for high-energy physics to the ultrabright x-ray pulses to study ultrafast phenomena at elemental spatio-temporal scales [1–4]. The progress of ultra-intense femtosecond lasers, now attaining multi PetaWatt peak power, has recently enabled the demonstration of GeV electron beams in centimeter scale plasma accelerating section [5, 6], with the recent world record reaching 8 GeV in 20 cm [7]. As for ultrafast x-ray science, in their relatively short time since their advent, x-ray free electron lasers [8, 9] (FEL) have demonstrated the capacity to answer grand fundamental questions in a diverse set of areas in physics, chemistry, and biology, such as revealing vibration coherence in molecules [10], molecular bond formation, charge migration, and dissociation dynamics [11, 12], or ultrafast isomerization in biomolecules [13, 14], among many others. Further advances in facilities—such as augmented brightness, attosecond duration, or seeded emission—are poised to creating new scienti?c frontiers in atomic-scale correlated systems and ultrahigh resolution inner shell spectroscopies.
关键词： free electron laser (FEL),ultrafast optics,X-ray emission,non-linear optics,laser accelerated particles,secondary emission and photoemission
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE International Electron Devices Meeting (IEDM) - San Francisco, CA, USA (2019.12.7-2019.12.11)] 2019 IEEE International Electron Devices Meeting (IEDM) - First Demonstration of Waveguide-Integrated Black Phosphorus Electro-Optic Modulator for Mid-Infrared Beyond 4 ??m
摘要： Matrix inversion is a fundamental operation for solving linear equations for many computational applications, especially for various emerging big data applications. However, it is a challenging task to invert large-scale matrices of extremely high order (several thousands or millions), which are common in most Web-scale systems, such as social networks and recommendation systems. In this paper, we present a lower upper decomposition-based block-recursive algorithm for large-scale matrix inversion. We present its well-designed implementation with optimized data structure, reduction of space complexity, and effective matrix multiplication on the Spark parallel computing platform. The experimental evaluation results show that the proposed algorithm is efficient to invert large-scale matrices on a cluster composed of commodity servers and is scalable for inverting even larger matrices. The proposed algorithm and implementation will become a solid foundation for building a high-performance linear algebra library on Spark for big data processing and applications.
关键词： linear algebra,parallel algorithm,distributed computing,Matrix inversion,LU decomposition,Spark
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Atlanta, GA, USA (2019.7.7-2019.7.12)] 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - A Substrate Integrated Waveguide Filtering Slot Antenna Array
摘要： A fully integrated 1×4 filtering linear antenna array is presented in this work. The filtering array is designed in substrate integrated waveguide technology and consists of 5 coupled cavities with a 6th-order filtering function. The antenna array is formed with a linear arrangement of four slot antennas in the final cavities which excite two modes in the radiating cavity. The array operates at a center frequency of 6.75 GHz with a fractional bandwidth of 5.0% and with a gain of 7.44 dBi.
关键词： slot antennas,cavity resonators,linear antenna arrays,band pass filters
更新于2025-09-16 10:30:52
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[IEEE 2019 Workshop on Recent Advances in Photonics (WRAP) - Guwahati, India (2019.12.13-2019.12.14)] 2019 Workshop on Recent Advances in Photonics (WRAP) - Optical Response of a Subwavelength Grating Waveguide Loaded With a Plasmonic Nanoantenna
摘要： Recently, a framework was given for linear error-correcting network codes (LENCs) over cyclic networks on commutative rings. When the alphabet is considered as a rational power series ring, an LENC is referred to as a convolutional error-correcting network code (CENC). Recently, a metric was introduced for these codes based on the minimum rank distance. In this paper, a new metric is introduced for ring-based LENCs over cyclic networks based on the Hamming distance, which is referred to as the network Hamming distance. Then, some connections between maximum distance separable (MDS) LENCs and classical MDS codes are obtained. Finally, the network Hamming free distance is given for CENCs, which plays the role of the free distance for convolutional codes.
关键词： network Hamming distance,commutative ring,Linear error-correcting network code,ML decoder,free distance
更新于2025-09-16 10:30:52
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[IEEE 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Guangzhou, China (2019.5.19-2019.5.22)] 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Dynamically Substrate Integrated Waveguide Programmable Metasurface for SAR imaging
摘要： In an acyclic multicast network, it is well known that a linear network coding solution over GF(q) exists when q is sufficiently large. In particular, for each prime power q no smaller than the number of receivers, a linear solution over GF(q) can be efficiently constructed. In this paper, we reveal that a linear solution over a given finite field does not necessarily imply the existence of a linear solution over all larger finite fields. In particular, we prove by construction that: 1) for every ω ≥ 3, there is a multicast network with source outdegree ω linearly solvable over GF(7) but not over GF(8), and another multicast network linearly solvable over GF(16) but not over GF(17); 2) there is a multicast network linearly solvable over GF(5) but not over such GF(q) that q > 5 is a Mersenne prime plus 1, which can be extremely large; 3) a multicast network linearly solvable over GF(q m1 ) and over GF(q m2 ) is not necessarily linearly solvable over GF(q m1+m2 ); and 4) there exists a class of multicast networks with a set T of receivers such that the minimum field size qmin for a linear solution over GF(qmin) is lower bounded by (cid:3)( |T |), but not every larger field than GF(qmin) suffices to yield a linear solution. The insight brought from this paper is that not only the field size but also the order of subgroups in the multiplicative group of a finite field affects the linear solvability of a multicast network.
关键词： multicast network,field size,lower bound,Linear network coding,Mersenne prime
更新于2025-09-16 10:30:52
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[IEEE 2019 3rd International Conference on Robotics and Automation Sciences (ICRAS) - Wuhan, China (2019.6.1-2019.6.3)] 2019 3rd International Conference on Robotics and Automation Sciences (ICRAS) - Research on Welding Seam Tracking Technology Based on Linear Laser CCD Robot
摘要： This article is to the robot welding seam tracking of the CCD line laser sensor detection technology used in research. In view of the weld position real-time detection problem, can use a 3D data real-time weld contour line laser detection sensor, based on the triangulation principle, with a particular wavelength thread to test for the laser, the laser stripe center pixel coordinates calculated weld profile 3D coordinate. Laser triangulation is a non - contact method for absolute measurement of welds. This can not only meet the real-time measurement, but also ensure the high accuracy of measurement. This measurement method has become the development trend of industrial production, can effectively resist the interference of arc light and spatter, and meet the actual welding requirements.
关键词： weld detection,trigonometry,linear laser CCD,image processing
更新于2025-09-16 10:30:52