scholarly journals Photodetectors Based on Micro-nano Structure Material

2022 ◽  
Vol 9 ◽  
Author(s):  
Yu Yu ◽  
Wuyue Wang ◽  
Weihua Li ◽  
Gong Wang ◽  
Yulei Wang ◽  
...  
Keyword(s):  
Optical Communication ◽  
Future Development ◽  
Performance Indicators ◽  
Dual Band ◽  
Optical Interconnection ◽  
Two Dimensional ◽  
Nano Structure ◽  
Optical Signals ◽  
Nano Structures ◽  
Development Prospects

Photodetectors converting optical signals into electrical signals have been widely utilized and have received more and more attention in scientific research and industrial fields including optical interconnection, optical communication, and environmental monitoring. Herein, we summarize the latest development of photodetectors with different micro-nano structures and different materials and the performance indicators of photodetectors. Several photodetectors, such as flexible, ultraviolet two-dimensional (2D) microscale, and dual-band photodetectors, are listed in this minireview. Meanwhile, the current bottleneck and future development prospects of the photodetector are discussed.

scholarly journals Machine learning for perovskite materials design and discovery

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Qiuling Tao ◽  
Pengcheng Xu ◽  
Minjie Li ◽  
Wencong Lu
Keyword(s):  
Machine Learning ◽  
Technological Innovation ◽  
Future Development ◽  
Rational Design ◽  
Driving Forces ◽  
Scientific Progress ◽  
Double Perovskites ◽  
Perovskite Materials ◽  
Development Tendency ◽  
Development Prospects

AbstractThe development of materials is one of the driving forces to accelerate modern scientific progress and technological innovation. Machine learning (ML) technology is rapidly developed in many fields and opening blueprints for the discovery and rational design of materials. In this review, we retrospected the latest applications of ML in assisting perovskites discovery. First, the development tendency of ML in perovskite materials publications in recent years was organized and analyzed. Second, the workflow of ML in perovskites discovery was introduced. Then the applications of ML in various properties of inorganic perovskites, hybrid organic–inorganic perovskites and double perovskites were briefly reviewed. In the end, we put forward suggestions on the future development prospects of ML in the field of perovskite materials.

scholarly journals Hybrid Metamaterials Perfect Absorber and Sensitive Sensor in Optical Communication Band

2021 ◽  
Vol 9 ◽  
Author(s):  
Xuehan Liu ◽  
Keyang Li ◽  
Zhao Meng ◽  
Zhun Zhang ◽  
Zhongchao Wei
Keyword(s):  
Optical Communication ◽  
Electromagnetic Waves ◽  
Incident Angle ◽  
Silicon Layer ◽  
Resonance Wavelength ◽  
Metamaterial Absorber ◽  
Absorption Peak ◽  
Dual Band ◽  
Perfect Absorber ◽  
Perfect Absorption

A subwavelength metamaterial perfect absorber (MPA) in optical communication band was proposed and tested using the finite-difference time-domain method. The absorber is periodic and comprises a top layer of diamond silicon surrounded by L-shaped silicon and a gold layer on the substrate. It can achieve dual-band perfect absorption, and one of the peaks is in the optical communication band. By changing the gap (g) between two adjacent pieces of L-shaped silicon, and the thickness (h) of the silicon layer, the resonance wavelength of absorption peak can be tuned. When the incident electromagnetic wave entered the absorber, the metamaterial absorber could almost completely consume the incident electromagnetic waves, thereby achieving more than 99% perfect absorption. The absorption peak reaches 99.986% at 1310 nm and 99.421% at 1550 nm. Moreover, the MPA exposed to different ambient refraction indexes can be applied as plasma sensors, and can achieve multi-channel absorption with high figure of merit (FOM*) value and refractive index (RI) sensitivity. The FOM* values at 1310 nm and 1550 nm are 6615 and 168, respectively, and both resonance peaks have highly RI sensitivity. The results confirm that the MPA is a dual-band, polarization-independent, wide-angle absorber and insensitive to incident angle. Thence it can be applied in the fields of optical communication, used as a light-wave filter and plasma sensor, and so on.

scholarly journals The Relationship between High-Rise Building and Urban Environment

2015 ◽  
Vol 4 (3) ◽  
pp. 18
Author(s):  
Shujun Shi
Keyword(s):  
Sustainable Development ◽  
Urban Environment ◽  
Future Development ◽  
Comprehensive Analysis ◽  
High Rise ◽  
High Rise Building ◽  
Development Direction ◽  
Negative Impacts ◽  
The Relationship ◽  
Development Prospects

<p>High-rise buildings have become an inevitable trend in future building development. Since today’s building theories and technologies have not fully matured, we should perform a comprehensive analysis by combining urban environmental conditions in order to promote sustainable development of high-rise buildings. This study will discuss development prospects and problems of high-rise buildings via the relationship between urban environment and high-rise buildings, in order to form a more comprehensive and mature understanding of future development direction and the focus of high-rise building, and to propose appropriate countermeasures to the negative impacts of high-rise buildings on the development of urban environment.</p>

scholarly journals Two-Dimensional Constellation Shaping in Fiber-Optic Communications

2019 ◽  
Vol 9 (9) ◽  
pp. 1889 ◽  
Author(s):  
Zhen Qu ◽  
Ivan B. Djordjevic ◽  
Jon Anderson
Keyword(s):  
Optical Communication ◽  
Gaussian Noise ◽  
Communication Systems ◽  
Fiber Optic ◽  
Two Dimensional ◽  
Fiber Optic Communications ◽  
System Architectures ◽  
Recent Advances ◽  
Constellation Shaping ◽  
Optical Communication Systems

Constellation shaping has been widely used in optical communication systems. We review recent advances in two-dimensional constellation shaping technologies for fiber-optic communications. The system architectures that are discussed include probabilistic shaping, geometric shaping, and hybrid probabilistic-geometric shaping solutions. The performances of the three shaping schemes are also evaluated for Gaussian-noise-limited channels.

INTELLECTUAL PROPERTY SECURITIZATION

2019 ◽  
pp. 42-48
Author(s):  
Angelina Ivanova
Keyword(s):  
Intellectual Property ◽  
Future Development ◽  
Legal Framework ◽  
Foreign Countries ◽  
The Future ◽  
Pros And Cons ◽  
Development Prospects

The article analyzes a legal framework for the intellectual property securitization based on experience of foreign countries. The structure of a securitization transaction is depicted, including the different players and tools in the securitization process. The concluding part summarizes the pros and cons of the funding instrument and the future development prospects

Fabrication and Characterization of Superhydrophobic Film on Titanium Substrate

2013 ◽  
Vol 834-836 ◽  
pp. 29-32
Author(s):  
Dong Ping Long ◽  
Jian Rong Xue ◽  
Zhi Xin Yan
Keyword(s):  
Contact Angle ◽  
Titanium Substrate ◽  
Electrochemical Anodization ◽  
Porous Structures ◽  
Test Results ◽  
Nano Structure ◽  
Low Surface Energy ◽  
Nano Structures ◽  
Fluorinated Silane

TiO2 nano film with different nano structure were prepared on the surfaces of titanium TA1 and titanium alloy TC4 via electrochemical anodization. The surface morphology was observed with SEM, and it is found that TiO2 films prepared on TA1 surface have porous structures, while the TiO2 films synthesized on TC4 surface look like nano rod. The contact angle(CA) test results show that the TiO2 nano film prepared on TA1 is hydrophilicity and the CA is about 19°,the film on the TC4 is super hydrophilicity and its CA is smaller than 2°. After combined with fluorinated silane the self-assembled film synthesized on the surfaces and they are superhy- drophobic and the Contact angle is 150° and 158° respectively. It is concluded that both nano- structures and fluoroalkysilanes with low surface energy have play an important role in the wettability with the contact angle is more than 150°. The surface only have nano roughness without the low energy does not show superhydrophobicity.

scholarly journals The Fabrication of Micro/Nano Structures by Laser Machining

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1789 ◽  
Author(s):  
Liangliang Yang ◽  
Jiangtao Wei ◽  
Zhe Ma ◽  
Peishuai Song ◽  
Jing Ma ◽  
...  
Keyword(s):  
Focused Ion Beam ◽  
Piezoelectric Materials ◽  
Ion Beam ◽  
New Technology ◽  
Laser Machining ◽  
Step Method ◽  
Surface Plasma Resonance ◽  
Nano Structure ◽  
Nano Structures ◽  
Wide Range

Micro/nano structures have unique optical, electrical, magnetic, and thermal properties. Studies on the preparation of micro/nano structures are of considerable research value and broad development prospects. Several micro/nano structure preparation techniques have already been developed, such as photolithography, electron beam lithography, focused ion beam techniques, nanoimprint techniques. However, the available geometries directly implemented by those means are limited to the 2D mode. Laser machining, a new technology for micro/nano structural preparation, has received great attention in recent years for its wide application to almost all types of materials through a scalable, one-step method, and its unique 3D processing capabilities, high manufacturing resolution and high designability. In addition, micro/nano structures prepared by laser machining have a wide range of applications in photonics, Surface plasma resonance, optoelectronics, biochemical sensing, micro/nanofluidics, photofluidics, biomedical, and associated fields. In this paper, updated achievements of laser-assisted fabrication of micro/nano structures are reviewed and summarized. It focuses on the researchers’ findings, and analyzes materials, morphology, possible applications and laser machining of micro/nano structures in detail. Seven kinds of materials are generalized, including metal, organics or polymers, semiconductors, glass, oxides, carbon materials, and piezoelectric materials. In the end, further prospects to the future of laser machining are proposed.

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