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On-chip visible comb generation covering from 720 to 840 nm is demonstrated in AlN-on-sapphire microring resonators. Broadband frequency conversion of near-infrared Kerr comb into visible region is achieved in slightly phase-mismatched condition.
Coexistence of stimulated Raman scattering and four-wave mixing is observed in high quality factor AlN-on-sapphire microring resonators, which facilitates broadband Kerr frequency comb generation covering from 1.2 to 2.2 μm along with strong Raman lines.
A dynamically tunable planar multiplayer absorber is demonstrated using the VO2 phase-change material. As the VO2 phase transition is thermally triggered, a modulation depth of 72.6% is achieved over a broad wavelength range from 4–8.2μm.
An enhancement of graphene interband absorption by more than four-fold is demonstrated in a Salisbury screen configuration. For a monolayer graphene, peak absorptions between 9% and 40% are measured at different incident angles.
We present a new point set registration method with global-local correspondence and transformation estimation (GL-CATE). The geometric structures of point sets are exploited by combining the global feature, the point-to-point Euclidean distance, with the local feature, the shape distance (SD) which is based on the histograms generated by an elliptical Gaussian soft count strategy. By using a bidirectional...
Particulate matter 2.5 (PM2.5) pollution has become one of the most urgent issues to be addressed in China. The anthropogenic reasons of PM2.5 formation have considered to be highly related to local economic development model, industrial structure, energy structure and fast urbanization. The aim of this study is to explore the quantitative relationship between PM2.5 and anthropogenic factors in China...
THz and IR detections have generated tremendous interests lately due to their safe non-intrusion nature, and thus have a wide applicability in medical, security, and x imaging. In this work, thin film Au-In0.53Ga0.47As Schottky device are fabricated for 28.3 THz detection. The schematic of the device is shown in Fig. 1, consisting of the thin film Schottky diode and a bowtie antenna. This device structure...
Due to their favorable properties, extensive efforts have been done to extend the applications of Schottky diodes into infrared (IR) nonlinear applications. Primarily, efforts have been concentrated in reducing their series resistances and their capacitances in order to increase their cutoff frequencies [1]. Here, we introduce novel single crystal thin film Au-In0.53Ga0.47As Schottky diodes, in which...
Pixel-wise coded exposure, as an emerging field of research in computational imaging, is widely implemented in applications such as high-speed imaging, compressive sensing, and focal-stack imaging. In this paper, a complementary metal-oxide-semiconductor (CMOS) pixel design for binary coded exposure is presented. Based on an always-on charge distribution structure, the proposed pixel achieves programmable...
A CMOS pixel design that is capable of spatial-temporal exposure encoding is presented. By integrating selective charge storage units and exposure code memories in an active pixel sensor (APS) structure, the 10 µm×10 μm pixel design performs intermittent exposure according to the received binary exposure codes. Under a 625 nm illumination and with a 3.3 V supply, a 10×10 prototype image sensor fabricated...
In order to effectively control the risk of software project and overcome the effect of lack data and human subjective factors in the traditional evaluation, the transformation of quantification and reduction of natural language is realized, so a new evaluation model is put forward. Based on the concepts of risk weight, expert trust, risk consequence and so on, we use the correlation coefficient to...
Despite the overwhelming success of deep learning in various speech processing tasks, the problem of separating simultaneous speakers in a mixture remains challenging. Two major difficulties in such systems are the arbitrary source permutation and unknown number of sources in the mixture. We propose a novel deep learning framework for single channel speech separation by creating attractor points in...
Deep clustering is the first method to handle general audio separation scenarios with multiple sources of the same type and an arbitrary number of sources, performing impressively in speaker-independent speech separation tasks. However, little is known about its effectiveness in other challenging situations such as music source separation. Contrary to conventional networks that directly estimate the...
A novel optically tunable microwave phase shifter is demonstrated based on high-Q (intrinsic quality factor ∼ 3.3×106) epitaxial AlN microring, exhibiting a tuning range of 0–332° and RF-power variation less than 3 dB for a 19 GHz signal.
Relative intensity noise (RIN) characteristics of mutually injection locked distributed feedback (DFB) laser diodes is investigated. RIN around the relaxation oscillation frequency in both lasers is found to be simultaneously suppressed in the mutual locking status.
Raman lasing is observed in epitaxial aluminum nitride microring with loaded quality factor of ∼1.2×106. The threshold pump power is ∼8.7 mW, with unidirectional slope efficiency of ∼5.1%. Raman frequency shifts of ∼612 and ∼657 cm−1 are observed for incident light with different polarization.
The purpose of this paper is mainly to detect the sample of polluted river by means of microwave, and may determine what pollutants the surface water contains and the concentrations of pollutants by using various pollutants to estimate the different absorption and attenuation of electromagnetic wave and by the data tables and related conclusions obtained by the timely monitoring system of electromagnetic...
Computational imaging has recently attracted much attention due to its excellent potential in delivering advanced capabilities such as motion deblurring and high-speed compressive sensing. However, the development of computational cameras has been limited by the lack of a technology that can efficiently support temporal encoding. Conventionally, temporal encoding is performed by complicated off-chip...
Over the last decade, computational cameras have demonstrated superior performance in a variety of applications. Currently, optical encoding is implemented using components that are typically not integrated on the image sensor chip. This results in camera systems with large physical sizes, performance compromises, and implementation challenges, particularly in applications where size and power are...
Abandoned object detection is a crucial problem in many computer vision tasks. Traditional method based on foreground/background extraction techniques leads to a high false alarm rate. In this paper, we propose a novel detection algorithm based on change detection and blob separation. Our proposed approach suits more practical scenarios in which objects located near each other. Experiments are conducted...
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