Development of acoustic “meta-liners” providing sub-wavelength absorption

The sound absorptive performance of a proposed “meta-liner” are investigated in this paper. The structure is composed of closely placed plates connected by openings at alternating locations in a stacked format. This system presents multiple band gaps with high absorption and sub-wavelength behaviour (sample thickness equals 0.04 λ), achieved through tortuosity within the design. The acoustic response of the single layer is obtained numerically and with experimental verification under normal incidence. The repeating cellular design allows efficiencies in the viscothermal numerical analysis and using a transfer matrix approach, it is demonstrated that the response of the overall system may be efficiently predicted from a detailed model of a unit cell. Both the transfer matrix method and a full viscothermal model are validated against experimental data as a function of system depth. The analysis gives very satisfactory results which could form the basis for future designs.

Download Full-text

Design and Analysis of High Absorber Based on Sub-Wavelength Grating Structure

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.872.89 ◽

2017 ◽

Vol 872 ◽

pp. 89-93

Author(s):

Kun Li ◽

Yu Qing Xiong ◽

Sheng Zhu Cao ◽

Kai Feng Zhang ◽

Hu Wang ◽

...

Keyword(s):

Finite Difference Time Domain ◽

Electric Field Distribution ◽

Layer Structure ◽

Single Layer ◽

Double Layers ◽

Broadband Absorption ◽

Grating Structure ◽

Difference Time ◽

High Absorption ◽

Sub Wavelength

Two kinds of high absorber were designed based on sub-wavelength grating structure for aluminum substrate. The absorption and electric field distribution of these two structures were calculated by using the finite difference time domain method. One absorber was obtained by using Al2O3/SiO2 double layers and Al rectangular sub-wavelength layer which has high absorption peaks both in TE polarization and TM polarization in infrared spectrum. Another absorber was a single layer structure with a triangular sub-wavelength grating structure which had a broadband absorption in TE polarization at spectral range of 300-1000nm.Simulation results showed that the absorption of this absorber increase and then decreases with the increasing of the height of sub-wavelength grating. The average absorption reached the maximum when the height of grating was 800nm.

Download Full-text

Extended discrete-time transfer matrix approach to modeling and decentralized control of lattice-based structures

Structural Control and Health Monitoring ◽

10.1002/stc.1837 ◽

2016 ◽

Vol 23 (10) ◽

pp. 1256-1272 ◽

Cited By ~ 4

Author(s):

Nick Cramer ◽

Sean Shan-Min Swei ◽

Kenneth C. Cheung ◽

Mircea Teodorescu

Keyword(s):

Transfer Matrix ◽

Decentralized Control ◽

Discrete Time ◽

Matrix Approach ◽

Time Transfer ◽

Transfer Matrix Approach

Download Full-text

A transfer-matrix approach to random resistor networks

Journal of Physics A General Physics ◽

10.1088/0305-4470/15/10/007 ◽

1982 ◽

Vol 15 (10) ◽

pp. L557-L564 ◽

Cited By ~ 220

Author(s):

B Derrida ◽

J Vannimenus

Keyword(s):

Transfer Matrix ◽

Matrix Approach ◽

Resistor Networks ◽

Transfer Matrix Approach

Download Full-text

Slowly varying amplitude approximation appraised by transfer-matrix approach

Physical Review B ◽

10.1103/physrevb.60.10644 ◽

1999 ◽

Vol 60 (15) ◽

pp. 10644-10647 ◽

Cited By ~ 9

Author(s):

Zhi-Yuan Li ◽

Ben-Yuan Gu ◽

Guo-Zhen Yang

Keyword(s):

Transfer Matrix ◽

Matrix Approach ◽

Transfer Matrix Approach

Download Full-text

Optical properties of silicene-dielectric interfaces from IR to far UV

International Journal of Modern Physics B ◽

10.1142/s0217979221502350 ◽

2021 ◽

pp. 2150235

Author(s):

Yujun Hou ◽

Chun Jiang

Keyword(s):

Optical Properties ◽

Single Layer ◽

Normal Incidence ◽

Complex Surface ◽

Optical Characterization ◽

Potential Candidate ◽

Dielectric Interfaces ◽

Uv Absorbers ◽

Uv Range

Since the growth of single layer of Si has emerged, silicene became a potential candidate material to make up the disadvantage of graphene. In this paper, the complex surface conductivity is applied to characterize the properties of silicene and we investigate the optical characterization of silicene-dielectric interfaces from IR to far UV range. The silicene-Si and silicene-Ge interfaces along both parallel and perpendicular polarization directions of electromagnetic field with normal incidence are considered in this work. The optical properties of the silicene-dielectric systems proposed in this paper lay a foundation for the performance of complex silicene-based optoelectronic devices such as sensors, detectors, filters, UV absorbers and so on.

Download Full-text

Transfer-matrix approach to electron transport in inhomogeneous magnetic fields

Computer Physics Communications ◽

10.1016/s0010-4655(01)00383-6 ◽

2001 ◽

Vol 142 (1-3) ◽

pp. 429-435 ◽

Cited By ~ 1

Author(s):

K. Yakubo

Keyword(s):

Electron Transport ◽

Magnetic Fields ◽

Transfer Matrix ◽

Matrix Approach ◽

Transfer Matrix Approach

Download Full-text

Transfer-matrix approach to the problem of electrical conduction through a series of absorbers

physica status solidi (b) ◽

10.1002/pssb.200642311 ◽

2007 ◽

Vol 244 (3) ◽

pp. 1088-1094 ◽

Cited By ~ 1

Author(s):

Kamil Walczak

Keyword(s):

Transfer Matrix ◽

Electrical Conduction ◽

Matrix Approach ◽

Transfer Matrix Approach

Download Full-text

Transfer matrix approach to the three-dimensional Ising model

Journal of Physics A General Physics ◽

10.1088/0305-4470/20/8/031 ◽

1987 ◽

Vol 20 (8) ◽

pp. 2187-2197 ◽

Cited By ~ 3

Author(s):

P Audit

Keyword(s):

Ising Model ◽

Transfer Matrix ◽

Three Dimensional ◽

Matrix Approach ◽

Transfer Matrix Approach

Download Full-text

Electrically Tunable Broadband Terahertz Absorption with Hybrid-Patterned Graphene Metasurfaces

Nanomaterials ◽

10.3390/nano8080562 ◽

2018 ◽

Vol 8 (8) ◽

pp. 562 ◽

Cited By ~ 20

Author(s):

Longfang Ye ◽

Xin Chen ◽

Guoxiong Cai ◽

Jinfeng Zhu ◽

Na Liu ◽

...

Keyword(s):

Incident Angle ◽

Single Layer ◽

Normal Incidence ◽

Transverse Magnetic ◽

Single Layer Graphene ◽

Terahertz Waves ◽

Broadband Absorption ◽

Terahertz Sensing ◽

Axisymmetric Configuration ◽

Broadband Terahertz

We numerically demonstrate a broadband terahertz (THz) absorber that is based on a hybrid-patterned graphene metasurface with excellent properties of polarization insensitivity, wide-angle, and active tunability. Our design is made up of a single-layer graphene with periodically arranged hybrid square/disk/loop patterns on a multilayer structure. We find that broadband absorption with 90% terahertz absorbance and the fractional bandwidth of 84.5% from 1.38 THz to 3.4 THz can be achieved. Because of the axisymmetric configuration, the absorber demonstrates absolute polarization independence for both transverse electric (TE) and transverse magnetic (TM) polarized terahertz waves under normal incidence. We also show that a bandwidth of 60% absorbance still remains 2.7 THz, ranging from 1.3 THz to 4 THz, for a wide incident angle ranging from 0° to 60°. Finally, we find that by changing the graphene Fermi energy from 0.7 eV to 0 eV, the absorbance of the absorbers can be easily tuned from more than 90% to lower than 20%. The proposed absorber may have promising applications in terahertz sensing, detecting, imaging, and cloaking.

Download Full-text