Terahertz Bragg Resonator Based on a Mechanical Assembly of Metal Grating and Metal Waveguide

AbstractThe discovery of Photonic spin Hall effect (PSHE) on surface plasmon polaritons (SPPs) is an important progress in photonics. In this paper, a method of realizing multi-channel PSHE in two-dimensional metal-air-metal waveguide is proposed. By modulating the phase difference $$\phi$$ ϕ and polar angle $$\theta$$ θ of the dipole source, the SPP can propagate along a specific channel. We further prove that PSHE results from the component wave interference theory. We believe that our findings will rich the application of SPPs in optical devices.

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Design of a Liquid-Crystal-Tunable Terahertz Demultiplexer Based on a Metal-Insulator-Metal Waveguide

Applied Sciences ◽

10.3390/app9040644 ◽

2019 ◽

Vol 9 (4) ◽

pp. 644

Author(s):

Xue-Shi Li ◽

Naixing Feng ◽

Yuan-Mei Xu ◽

Liang-Lun Cheng ◽

Qing Liu

Keyword(s):

Liquid Crystal ◽

Electric Field ◽

Metal Insulator ◽

Resonance Modes ◽

External Bias ◽

Bias Electric Field ◽

Metal Waveguide ◽

Metal Insulator Metal ◽

Fabry Perot ◽

Mim Waveguide

A tunable demultiplexer with three output channels infiltrated by liquid crystal (LC) is presented, which is based on a metal-insulator-metal (MIM) waveguide. The operating frequencies of the three output channels can be tuned simultaneously at will by changing the external bias electric field applied to the LC. By analyzing the Fabry-Pérot (FP) resonance modes of the finite-length MIM waveguide both theoretically and numerically, the locations of the three channels are delicately determined to achieve the best demultiplexing effects. Terahertz (THz) signals input from the main channel can be demultiplexed by channels 1, 2 and 3 at 0.7135 THz, 1.068 THz and 1.429 THz, respectively. By applying an external electric field to alter the tilt angle of the infiltrating LC material, the operating frequencies of channels 1, 2 and 3 can be relatively shifted up to 12.3%, 9.6% and 9.7%, respectively. The designed demultiplexer can not only provide a flexible means to demultiplex signals but also tune operating bands of output channels at the same time.

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Research of reliability and efficiency of technological processes of mechanical assembly production on the basis of the common semi-Markov model

MATEC Web of Conferences ◽

10.1051/matecconf/201822401138 ◽

2018 ◽

Vol 224 ◽

pp. 01138

Author(s):

Yuri Rapatskiy ◽

Mikhail Zamorenov ◽

Vadim Kopp ◽

Yuri Obzherin ◽

Vladimir Gusev ◽

...

Keyword(s):

Distribution Functions ◽

Mechanical Assembly ◽

Renewal Equations ◽

Technological Processes ◽

Threaded Connections ◽

Proposed Model ◽

The Common ◽

Semi Markov Processes ◽

Simulation Parameters ◽

Assembly Production

In the article a common semi-Markov mathematical model is considered that allows one to investigate the productivity and reliability of various technological processes of mechanical assembly production. The proposed model allows to study, inter alia, technological processes of manufacturing parts with screw and assemblies of threaded connections. Mathematical apparatus of the research is the theory of semi-Markov processes with a common phase space, which operates with a common kind of random variables distribution functions. If the considering process in the system is a subsystem located on a higher level of hierarchy, the hierarchical model for compatibility with each other levels as output simulation parameters required distribution functions. In the proposed model, based on the decision of the Markov renewal equations depend not only on the torque characteristics, but also the distribution function of time per unit of output service according to different kinds of undervalued failures.

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A Novel Symbolic OBDD Algorithm for Generating Mechanical Assembly Sequences Using Decomposition Approach

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.201-203.24 ◽

2011 ◽

Vol 201-203 ◽

pp. 24-29

Author(s):

Zhou Bo Xu ◽

Tian Long Gu ◽

Liang Chang ◽

Feng Ying Li

Keyword(s):

Assembly Sequence Planning ◽

The Novel ◽

Mechanical Assembly ◽

Breadth First Search ◽

Decomposition Approach ◽

Translation Function ◽

Assembly Sequences ◽

Cut Set ◽

Connected Subgraphs ◽

Induced Graph

The compact storage and efficient evaluation of feasible assembly sequences is one crucial concern for assembly sequence planning. The implicitly symbolic ordered binary decision diagram (OBDD) representation and manipulation technique has been a promising way. In this paper, Sharafat’s recursive contraction algorithm and cut-set decomposition method are symbolically implemented, and a novel symbolic algorithm for generating mechanical assembly sequences is presented using OBDD formulations of liaison graph and translation function. The algorithm has the following main procedures: choosing any one of vertices in the liaison graph G as seed vertex and scanning all connected subgraphs containing seed vertex by breadth first search; transforming the problem of enumerating all cut-sets in liaison graph into the problem of generating all the partitions: two subsets V1and V2of a set of vertices V where both the induced graph of vertices V1and V2are connected; checking the geometrical feasibility for each cut-set. Some applicable experiments show that the novel algorithm can generate feasible assembly sequences correctly and completely.

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