Low-Loss Impedance-Matched Optical Metamaterials with Zero-Phase Delay

ACS Nano ◽  
2012 ◽  
Vol 6 (5) ◽  
pp. 4475-4482 ◽  
Author(s):  
Seokho Yun ◽  
Zhi Hao Jiang ◽  
Qian Xu ◽  
Zhiwen Liu ◽  
Douglas H. Werner ◽  
...  
Keyword(s):  
Phase Delay ◽  
Low Loss ◽  
Optical Metamaterials ◽  
Zero Phase

A Novel Method to Realize Zero Phase Delay of Electromagnetic Wave

2013 ◽  
Vol 760-762 ◽  
pp. 315-319
Author(s):  
Guo Yan Dong ◽  
Xiu Lun Yang ◽  
Xiang Feng Meng
Keyword(s):  
Electromagnetic Wave ◽  
Phase Velocity ◽  
Energy Flow ◽  
Phase Delay ◽  
Delay Propagation ◽  
Transmission Process ◽  
Transmitted Waves ◽  
Novel Method ◽  
Zero Index ◽  
Zero Phase

Zero phase delay of electromagnetic wave (EMW) transmission can be realized based on the wavefront modulation of photonic crystals (PhCs). When the phase velocity is controlled perpendicular to the group velocity with wavefronts (or phasefronts) parallel to the direction of energy flow, the phase will keep constant in transmission process despite of the increase of propagating length. The phase different between the incident and transmitted waves is measured to demonstrate that the phase can remain invariable in PhCs instead of zero-index materials or zero-averaged-index PhC superlattices. This effect can be extended to other artificially engineered materials, and will open a new route to obtain perfect zero-phase delay propagation for EMW.

A Zero Phase Delay Power Divider Using Zero Phase Impedance Transformer

2018 ◽  
Vol 28 (10) ◽  
pp. 876-878
Author(s):  
Mi Zhou ◽  
Yixin Gu ◽  
Bayaner Arigong
Keyword(s):  
Phase Delay ◽  
Power Divider ◽  
Zero Phase

Metamaterials: Tailorable Zero-Phase Delay of Subwavelength Particles toward Miniaturized Wave Manipulation Devices (Adv. Mater. 40/2015)

2015 ◽  
Vol 27 (40) ◽  
pp. 6304-6304
Author(s):  
Qian Zhao ◽  
Zongqi Xiao ◽  
Fuli Zhang ◽  
Junming Ma ◽  
Ming Qiao ◽  
...  
Keyword(s):  
Phase Delay ◽  
Zero Phase

Sine phase compensation combining an amplitude phase controller and a discrete feed-forward compensator for electro-hydraulic shaking tables

2017 ◽  
Vol 40 (11) ◽  
pp. 3377-3389 ◽  
Author(s):  
Ge Li ◽  
Gang Shen ◽  
Zhen-Cai Zhu ◽  
Xiang Li ◽  
Wan-Shun Zang
Keyword(s):  
Control Strategy ◽  
Phase Error ◽  
Phase Delay ◽  
Shaking Table ◽  
Response Signal ◽  
Feed Forward ◽  
Amplitude Attenuation ◽  
Tracking Controller ◽  
Phase Deviation ◽  
Zero Phase

This article presents a novel control strategy on an electro-hydraulic shaking table under the acceleration control combining an amplitude phase controller and a zero phase error tracking controller with a discrete feed-forward compensator. Because of the electro-hydraulic system’s nonlinearity, phase delay and amplitude attenuation exist in the acceleration response signal inevitably when the electro-hydraulic shaking table system is excited by a sine vibration signal. Moreover, the phase delay of the electro-hydraulic shaking table is composed of phase deviation and actuator delay. For improving the acceleration tracking accuracy, an amplitude phase controller is employed to compensate the phase deviation and amplitude attenuation by introducing weights to adjust the reference signal. Meanwhile, the discrete feed-forward compensator is applied to compensate the actuator delay. As an offline compensator, the zero phase error tracking controller is employed to compensate the phase delay of the response signal and improve the convergence speed of the proposed controller. Overall, the proposed control strategy combines the merits of these three controllers with better tracking performance demonstrated by simulation and experimental results.

scholarly journals Laser Writing of Multiscale Chiral Polymer Metamaterials

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
E. P. Furlani ◽  
H. S. Jee ◽  
H. S. Oh ◽  
A. Baev ◽  
P. N. Prasad
Keyword(s):  
Molecular Level ◽  
Pulsed Laser ◽  
Incident Field ◽  
Polymer Mixture ◽  
Two Dimensional ◽  
Low Loss ◽  
New Approach ◽  
Optical Metamaterials ◽  
Two Photon ◽  
Chiral Polymer

A new approach to metamaterials is presented that involves laser-based patterning of novel chiral polymer media, wherein chirality is realized at two distinct length scales, intrinsically at the molecular level and geometrically at a length scale on the order of the wavelength of the incident field. In this approach, femtosecond-pulsed laser-induced two-photon lithography (TPL) is used to pattern a photoresist-chiral polymer mixture into planar chiral shapes. Enhanced bulk chirality can be realized by tuning the wavelength-dependent chiral response at both the molecular and geometric level to ensure an overlap of their respective spectra. The approach is demonstrated via the fabrication of a metamaterial consisting of a two-dimensional array of chiral polymer-based L-structures. The fabrication process is described and modeling is performed to demonstrate the distinction between molecular and planar geometric-based chirality and the effects of the enhanced multiscale chirality on the optical response of such media. This new approach to metamaterials holds promise for the development of tunable, polymer-based optical metamaterials with low loss.

Tailorable Zero-Phase Delay of Subwavelength Particles toward Miniaturized Wave Manipulation Devices

2015 ◽  
Vol 27 (40) ◽  
pp. 6187-6194 ◽  
Author(s):  
Qian Zhao ◽  
Zongqi Xiao ◽  
Fuli Zhang ◽  
Junming Ma ◽  
Ming Qiao ◽  
...  
Keyword(s):  
Phase Delay ◽  
Zero Phase

scholarly journals Zero phase delay in metamaterials

2014 ◽  
Vol 44 (4) ◽  
pp. 406-416
Author(s):  
Ji ZHOU ◽  
Ke BI ◽  
GuoYan DONG
Keyword(s):  
Phase Delay ◽  
Zero Phase
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