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We suggest and demonstrate experimentally AlGaAs nanoantennas for efficient second-harmonic generation (SHG). We show that the SHG directionality and efficiency are defined by either electric or magnetic multipoles and controlled by incident polarization and design.
We suggest and realize experimentally dielectric metasurfaces with high transmission efficiency for quantum multi-photon tomography, allowing for full reconstruction of pure or mixed quantum polarization states across a broad bandwidth.
We demonstrate experimentally sum-frequency generation in AlGaAs nano-resonators, establishing a quantum-classical correspondence with spontaneous parametric down-conversion. We predict that AlGaAs nano-resonators can be utilized as high-rate sources of photon pairs with non-classical correlations.
Intermodal road-rail transportation Systems (IRRTS) is a typical complex giant system which is dilïîcult for traditional management approaches to form effective solutions with dynamic adaptability. In the physical world, simple equipment upgrading and transport optimization can't satisfy the demand of IRRTS for high efficiency and low cost. Thus, a framework of parallel IRRTS based on ACP approach...
Considering the motion constraints of the robot, an autonomous navigation method based on Bug algorithm was proposed. Combining Dubins path and Bug algorithm, in the process a robot moving from initial pose position to final pose position, a path satisfied the robot's kinematics parameters was planned. Firstly, the robot moved along the initial Dubins path from initial pose position to final pose...
Based on the mobile robot path planning problem, on the basis of the improved grid method, this paper proposes an improved ant colony algorithm, the particle swarm optimization algorithm can be incorporated into the ant colony algorithm. Firstly, using the particle swarm optimization algorithm to search for global path roughly. At the same time of search for dynamic pheromone intelligent distribution,...
The pulse shaping (PS) is an effective and flexible technique for reducing the peak to average power ratio(PAPR) of orthogonal frequency division multiplexing (OFDM) system. However, different PS waveforms result in different probabilities of reducing the PAPR of OFDM signals. A combination sine pulse shaping (CS-PS) technique is proposed in this paper. The CS-PS waveform contains a linear term and...
Modern supply chain is a complex system and plays an important role for different sectors under the globalization economic integration background. Supply chain management system is proposed to handle the increasing complexity and improve the efficiency of flows of goods. It is also useful to prevent potential frauds and guarantee trade compliance. Currently, most companies maintain their own IT system...
All-dielectric and semiconductor nonlinear nanophotonics is an emerging field enabling efficient optical interactions between magnetic and electric resonances at sub-wavelength scales, thereby achieving high directionality and high figures of merit due to very low losses [1, 2]. It was shown that AlGaAs nanodisks with quadratic nonlinear susceptibility can provide second harmonic generation (SHG)...
A nonlinear mirror based on the nonlinear optical frequency conversion has been established as a universal tool for ultrafast control of laser dynamics [1]. However, traditional approaches are based on bulk crystals posing major difficulties on phase matching and alignment. Ultra-thin nonlinear mirrors based on all-dielectric metasurfaces would offer a major breakthrough to develop this concept [2-4]...
Measurements of quantum states of photons are conventionally performed with series of optical elements in bulk setups [1] or optical chips incorporating multiple tunable beam splitters. Here, we suggest and develop experimentally, for the first time to our knowledge, a new concept of quantum-polarization measurements with a single all-dielectric resonant metasurface [2]. The operating principle is...
The post-crowdfunding refers to the sale of products “very successful” in reward-based crowdfunding after the backers have been rewarded. It offers an opportunity for the creators to exploit the remaining untapped profit after the crowdfunding period. The post-crowdfunding includes the resale and normal sale stage, which involves the creators' various policies under the capital constraint based on...
The enterprise Wi-Fi networks enable the collection of large-scale users' trajectory datasets, which are highly desired for both research and commercial purposes. Meanwhile, releasing these mobility data also raises serious privacy concerns. A large body of work tries to achieve k-anonymity as the first step to solve the privacy problem and it has been qualitatively recognized that k-anonymity is...
Breast cancer risk assessment model can assess whether a people is at a high risk of developing breast cancer disease or not and confirm a breast cancer high-risk group. Because the etiology of breast cancer disease is different in different country and region, the existing risk assessment model is only adaptive to certain countries and regions. And the parameters of these models are fixed, so these...
The need of customized network functions for enterprises in Infrastructure-as-a-Service (IaaS) clouds is emerging. However, existing network functions in IaaS clouds are very limited, inflexible, and hard to control by the tenants. Recently, the introduction of Software-Defined Networking (SDN) technology brings the hope of flexible control of network flows and creation of diverse network functions...
High precision localization is essential to autonomous control of unmanned vehicles (mobile robots). Most existing methods for localization are either complex and costly, or bear low accuracy and poor robustness. In this work, a structurally simple and functionally effective localization system is designed and developed for snowplow robots with successful on-site application. The major hardware involved...
Proactive anomaly detection refers to anticipating anomalies or abnormal patterns within a dataset in a timely manner. Discovering anomalies such as failures or degradations before their occurrence can lead to great benefits such as the ability to avoid the anomaly happening by applying some corrective measures in advance (e.g., allocating more resources for a nearly saturated system in a data centre)...
Increasing complexity of integrated circuits and IP-based hardware designs have created the risk of hardware Trojans. This paper introduces a new type of threat, a coherence-exploiting hardware Trojan. This Trojan can be maliciously implanted in master components in a system, and continuously injects memory transactions onto the main interconnect. The injected traffic forces the eviction of cache...
Nano-structured materials, in particular nanoparticles, nanotubes, and nanowires, make it possible to have gas sensor at sensitivity of ppb level. However, mass production at low cost is always desirable but unachieved in such gas sensors. We will review our work of wafer-level fabrication of high-performance micro/nano gas sensor by naturally integrating micro-hot-platform (MHP) with nano structure...
Interior permanent magnet (PM) synchronous motor (IPMSM) has been used in many fields, such as the air conditioner, electric tool, electric vehicles, etc., due to their high efficiency, high power density and wide speed range. However, the torque distortion and high cost of PM materials has limited the application of the IPMSM. In this paper, a technique to enhance the torque performance and minimize...
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