scholarly journals Resonant Excitation of Terahertz Surface Plasmons in Subwavelength Metal Holes

2007 ◽  
Vol 2007 ◽  
pp. 1-8
Author(s):  
Weili Zhang ◽  
Abul K. Azad ◽  
Jiaguang Han
Keyword(s):  
Surface Plasmons ◽  
Experimental Studies ◽  
Transmission Efficiency ◽  
Skin Depth ◽  
Resonant Excitation ◽  
Terahertz Time Domain Spectroscopy ◽  
Resonant Transmission ◽  
Potential Applications ◽  
Hole Dimensions ◽  
Terahertz Transmission

We present a review of experimental studies of resonant excitation of terahertz surface plasmons in two-dimensional arrays of subwavelength metal holes. Resonant transmission efficiency higher than unity was recently achieved when normalized to the area occupied by the holes. The effects of hole shape, hole dimensions, dielectric function of metals, polarization dependence, and array film thickness on resonant terahertz transmission in metal arrays were investigated by the state-of-the-art terahertz time-domain spectroscopy. In particular, extraordinary terahertz transmission was demonstrated in arrays of subwavelength holes made even from Pb, a generally poor metal, and having thickness of only one-third of skin depth. Terahertz surface plasmons have potential applications in terahertz imaging, biosensing, interconnects, and development of integrated plasmonic components for terahertz generation and detection.

WAVELENGTH DEMULTIPLEXING IN METAL–INSULATOR–METAL PLASMONIC WAVEGUIDES

2014 ◽  
Vol 28 (04) ◽  
pp. 1450025 ◽  
Author(s):  
XIANKUN YAO
Keyword(s):  
Transmission Efficiency ◽  
Plasmonic Waveguides ◽  
Metal Insulator ◽  
Metal Insulator Metal ◽  
Integrated Optical ◽  
Potential Applications ◽  
Wavelength Demultiplexing ◽  
Optical Circuits ◽  
Difference Time ◽  
Mim Waveguide

In this paper, we have numerically investigated a novel kind of ultra-compact wavelength demultiplexing (WDM) in high-confined metal–insulator–metal (MIM) plasmonic waveguides. It is found that the drop transmission efficiency of the filtering cavity can be strongly enhanced by introducing a side-coupled cavity in the MIM waveguide. The theoretical analysis is verified by the finite-difference time-domain simulations. Through cascading the filtering units, a highly effective triple-wavelength demultiplexer is proposed by selecting the specific separation between the two coupled cavities of filtering units. Our results may find potential applications for the nanoscale WDM systems in highly integrated optical circuits and networks.

On vibration isolation of sandwich plate with periodic hollow tube core

2017 ◽  
Vol 21 (3) ◽  
pp. 1119-1132 ◽  
Author(s):  
Gui-Lan Yu ◽  
Hong-Wei Miao
Keyword(s):  
Vibration Isolation ◽  
Sandwich Plate ◽  
Experimental Studies ◽  
Low Frequency ◽  
Dispersion Relations ◽  
Frequency Responses ◽  
Vibration Attenuation ◽  
Potential Applications ◽  
Vibration Isolation Performance ◽  
Isolation Performance

The vibration isolation performance of a PC sandwich plate with periodic hollow tube core is investigated experimentally and numerically. The experiment results reveal that there exist vibration attenuation zones in acceleration frequency responses which can be improved by increasing the number of periods or tuning some structure parameters. The presence of soft fillers shifts the attenuation zone to lower frequencies and enhances the capability of vibration isolation to some extent. Dispersion relations and acceleration frequency responses are calculated by finite element method using COMSOL MULTIPHYSICS. The attenuation zones obtained by experiments fit well with that by simulations, and both are consistent with the band gap in dispersion relations. The numerical and experimental studies in the present paper show that this PC sandwich plate exhibits a good performance on vibration isolation in low frequency ranges, which will provide some useful references for relevant research and potential applications in vibration propagation manipulations.

scholarly journals A new class of nonreciprocal spin waves on the edges of 2D antiferromagnetic honeycomb nanoribbons

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
D. Ghader ◽  
A. Khater
Keyword(s):  
Spin Waves ◽  
Experimental Studies ◽  
Classical Field Theory ◽  
Experimental Investigations ◽  
Theory Approach ◽  
Magnetic Excitations ◽  
Spintronic Devices ◽  
New Class ◽  
Potential Applications ◽  
Edge Spin

Abstract Antiferromagnetic two-dimensional (2D) materials are currently under intensive theoretical and experimental investigations in view of their potential applications in antiferromagnet-based magnonic and spintronic devices. Recent experimental studies revealed the importance of magnetic anisotropy and of Dzyaloshinskii-Moriya interactions (DMI) on the ordered ground state and the magnetic excitations in these materials. In this work we present a robust classical field theory approach to study the effects of anisotropy and the DMI on the edge and bulk spin waves in 2D antiferromagnetic nanoribbons. We predict the existence of a new class of nonreciprocal edge spin waves, characterized by opposite polarizations in counter-propagation. These novel edge spin waves are induced by the DMI and are fundamentally different from conventional nonreciprocal spin waves for which the polarization is independent of the propagation direction. We further analyze the effects of the edge structures on the magnetic excitations for these systems. In particular, we show that anisotropic bearded edge nanoribbons act as topologically trivial magnetic insulators with potentially interesting applications in magnonics. Our results constitute an important finding for current efforts seeking to establish unconventional magnonic devices utilizing spin wave polarization.

Terahertz Transmission Properties of VO2 Thin Films Deposited on c-and m-Plane Sapphire Substrates by Pulsed Laser Deposition

2013 ◽  
Vol 710 ◽  
pp. 25-28 ◽  
Author(s):  
Xiao Qiang Kou ◽  
Ji Ming Bian ◽  
Zhi Kun Zhang
Keyword(s):  
Thin Films ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
X Ray Diffraction ◽  
Terahertz Time Domain Spectroscopy ◽  
Transmission Properties ◽  
Sapphire Substrates ◽  
Dense Distribution ◽  
Terahertz Transmission

Vanadium dioxide (VO2) films were grown on c-and m-plane sapphire substrates by pulsed laser deposition (PLD) technique with VO2ceramic target. The VO2films with preferred growth orientation and uniform dense distribution have been achieved on both substrates, as confirmed by X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The terahertz (THz) transmission properties of VO2thin films were studied by terahertz time-domain spectroscopy (THz-TDS). The results indicate that the THz transmission properties of VO2films are strongly influenced by the sapphire substrate orientation, suggesting that VO2films are ideal material candidates for THz modulation.

A Review on Desiccant Coated Heat Exchangers

2016 ◽  
Author(s):  
Asadullah Saeed ◽  
Ali Al-Alili
Keyword(s):  
Heat Exchangers ◽  
Energy Savings ◽  
Fixed Bed ◽  
Experimental Studies ◽  
Cooling Water ◽  
System Level ◽  
Working Fluid ◽  
Component Level ◽  
Potential Applications ◽  
Desiccant Material

Fixed bed and rotatory desiccant systems have been widely studied and used for dehumidification; they suffer from decreasing sorption capacity as the desiccant’s temperature increases due to the released heat of adsorption. The desiccant coated heat exchangers (DCHX) overcome this limitation. Such heat exchangers are able to deliver combined heat and mass transfer between the process air and the working fluid. The process air can be cooled and dehumidified simultaneously by pumping cooling water/refrigerant in the DCHX. The DCHX has to be heated cyclically to regenerate the desiccant material. This paper presents a review on the studies conducted on air-to-liquid DCHX. It summarizes various modeling approaches used to simulate the performance of DCHX as well as the experimental studies conducted to validate these models. It also reviews the current and potential applications of these heat exchangers. Current work in this field consists of experiments conducted on the DCHX as standalone equipment (i.e. component level) as well as an integrated component into cooling and dehumidification systems (system level). The integration of the DCHX in such systems was found to improve the COP, leading to energy savings.

scholarly journals IMAGING GEOMETRY AND POSITIONING ACCURACY OF DUAL SATELLITE STEREO IMAGES: A REVIEW

2017 ◽  
Vol IV-2/W4 ◽  
pp. 235-242 ◽  
Author(s):  
J. Jeong
Keyword(s):  
High Resolution ◽  
Satellite Data ◽  
Experimental Studies ◽  
Stereo Images ◽  
Positioning Accuracy ◽  
Imaging Geometry ◽  
Potential Applications

Many previous studies have demonstrated the potential applications of stereo pairs obtained from high-resolution satellites for accurate geo-positioning, but it should be noted that they are based on the conventional use of single-satellite stereo images produced by integrating two images taken by the same satellite. Considering the emergence of various types of satellite data and the requirements to combine these data, it is important to investigate dual-satellite stereo images that integrate two images taken by different satellites. This study reviews the image geometry and positioning accuracy of dual-satellite stereo images based on several important studies, including comparisons with conventional single-satellite stereo images. In particular, the geometric limitation of dual-satellite stereo images often leads to very weak geometry, which degrades the positioning accuracy according to theoretical and experimental studies. Optimal ray intersection can improve the positioning accuracy using dual-satellite stereo images. This review improves our understanding of satellite stereo geometry and the handling of the dual-satellite stereo images, which are expected to become more common in real mapping applications.

Nanoscale Energy Confinement and Hybridization of Surface Plasmons Based on Skin Depth in Au/Ag Core-Shell Nanostructures

Plasmonics ◽  
2014 ◽  
Vol 10 (4) ◽  
pp. 797-808 ◽  
Author(s):  
Xi-bin Xu ◽  
Miao Liu ◽  
Jiang-shan Luo ◽  
Yu-ying Wang ◽  
Zao Yi ◽  
...  
Keyword(s):  
Surface Plasmons ◽  
Skin Depth ◽  
Core Shell ◽  
Energy Confinement ◽  
Shell Nanostructures

scholarly journals Contact and elastohydrodynamic analysis of worm gears Part 2: Results

2001 ◽  
Vol 215 (7) ◽  
pp. 831-846 ◽  
Author(s):  
K. J. Sharif ◽  
S Kong ◽  
H. P. Evans ◽  
R. W. Snidle
Keyword(s):  
Film Formation ◽  
Elastohydrodynamic Lubrication ◽  
Transmission Efficiency ◽  
Tooth Contact Analysis ◽  
Wide Range ◽  
Potential Applications ◽  
Dry Conditions ◽  
Worm Gears ◽  
Loaded Tooth Contact Analysis ◽  
Small Instrument

The paper presents the results of modelling the contact and elastohydrodynamic lubrication (EHL) effects between the teeth of worm gears. A number of different practical worm gear designs have been studied covering a wide range of sizes and potential applications, from small instrument drives to high power units. All the designs are of the popular ZI type, in which the worm is an involute helicoid, with deliberate mismatch of tooth conformity in order to avoid damaging edge contact. The results cover loaded tooth contact analysis (‘loaded TCA’) under dry conditions, predicted film-generating behaviour with lubrication, surface and oil film temperatures, and calculated values of friction and transmission efficiency. It is demonstrated that regions of poor film formation may be predicted in a qualitative way on the basis of loaded TCA together with consideration of the kinematics of entrainment at the contacts.

Theoretical and experimental studies of surface plasmons excited at metal-uniaxial dielectric interface

2011 ◽  
Vol 98 (2) ◽  
pp. 021113 ◽  
Author(s):  
Xiaolei Wang ◽  
Pei Wang ◽  
Junxue Chen ◽  
Yonghua Lu ◽  
Hai Ming ◽  
...  
Keyword(s):  
Surface Plasmons ◽  
Experimental Studies ◽  
Dielectric Interface
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