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Seeing time-reversal transmission characteristics through kinetic anti-ferromagnetic Ising chain

Chinese Physics B 2012年第2期21卷 419-424页

作者： Chen Ying-Ming Wang Bing-Zhong Institute of Applied Physics University of Electronic Science and Technology of ChinaChengdu 610054China School of Physics and Electronic Information Huaibei Normal UniversityHuaibei 235000China

As an example of our new approach to complex near-field （NF） scattering of electromagnetic waves, the timereversal （TR） transmission process on an NF current-element array is mapped to the statistical process on a kinetic Ising transmission chain. Equilibrium statistical mechanics and non-equilibrium Monte Carlo （MC） dynamics help us to find signal jamming, aging, annihilating, creating, and TR symmetry breaking on the chain with inevitable background noises; and these results are general in NF systems where complex electromagnetic scattering arises.

关键词： time-reversal near-field scattering symmetry breaking temporal focusing

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The focusing performance with a horizontal time-reversal array at different depths in shallow water

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Chinese Physics B 2010年第12期19卷 347-355页

作者：张同伟杨坤德马远良 College of Marine Northwestern Polytechnical University

The performance of time-reversal focusing with a horizontal line array at different depths is investigated by normal mode modeling and computer simulation. It is observed that the focusing performance of a bottom-mounted horizontal time-reversal array is much better than that of a horizontal time-reversal array at other depths in shallow water. The normal mode modeling is used to explain this result. The absolute values of the modes at different depths are compared. It is shown that the number of modes whose absolute values close to zero is smaller at the bottom than that at other depths. It means that the horizontal time-reversal array deployed at the bottom can sample more modes, obtain more information of the probe source and achieve better focusing performance. The numerical simulations of time-reversal focusing performance under various conditions, such as different sound speed profiles, and different bottom parameters, lead to similar results.

关键词： time-reversal horizontal line array array depth

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Split-ring-based metamaterial for far-field subwavelength focusing based on time reversal

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Chinese Physics B 2014年第6期23卷 199-205页

作者：黄海燕丁帅王秉中臧锐 Institute of Applied Physics University of Electronic Science and Technology of China

In this paper, split-ring-based metamaterial sheets are designed for the purpose of achieving far-field subwavelength focusing, with the aid of a time-reversal technique. The metamaterial sheets are inserted into a subwavelength array consist- ing of four element antennas, with the element spacing being as small as 1/15 of a wavelength. Experiments are performed to investigate the effect of the metamaterial sheets on the focusing resolution. The results demonstrate that in the presence of the metamaterial sheets, the subwavelength array exhibits the ability to achieve super-resolution focusing, while there is no super-resolution focusing without the metamaterial sheets. Further investigation shows that the metamaterial sheets are contributive to achieving super-resolution by weakening the cross-correlations of the channel impulse responses between the array elements.

关键词： time-reversal metamaterial subwavelength focusing

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Ultrawide Bandgap Locally Resonant Sonic Materials

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Chinese Physics Letters 2005年第12期22卷 3107-3110页

作者：刘志明杨盛良赵恂 College of Astronautics and Material Engineering National University of Defense Technology Changsha 410073 PBC Research Center National University of Defense Technology Changsha 410073

We prepare a class of locally resonant （LR） sonic materials. The experiments demonstrate that the resonant frequency decreases with the increasing density of the scattering unit cores or with the reducing elastic constants of the silicone rubber coating. By combining three LR layers of different resonant frequencies and choosing 10 dB as the threshold of relative attenuation, we obtain an ultrawide bandgap （200-950Hz） sound material with an average transmission loss 22 dB lower than that dictated by mass density law.

关键词： WAVE-PROPAGATION time-reversal CRYSTALS FREQUENCY GAPS

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Photon Can Be Described as the Normalized Mutual Energy Flow

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Journal of Modern Physics 2020年第5期11卷 668-682页

作者： Shuang-Ren Zhao *** London Canada

Einstein guessed that the macroscopic electromagnetic wave is built by thousands of photons, however, no one has offered a theory about how the macroscopic electromagnetic wave is built from photons. A concrete theory about photons is needed to answer this question. Current theory for photons is Maxwell’s equation which has the solution of waves, but it is difficult to describe the photon as a particle. There is the paradox problem of wave-particle duality. This article offers one solution to solve this problem by introducing the normalized mutual energy flow. The interaction of the retarded wave and advanced wave produce the mutual energy flow. The mutual energy flow satisfies the mutual energy flow theorem. The mutual energy flow theorem tells us that the energy that goes through each surface between the emitter and the absorber is all same. That means the mutual energy flow is different in comparison to the waves. The wave, for example, the retarded wave, its amplitude is decreased with the distance from the source to the point of the field. The mutual energy flow does not decrease. The author noticed this and claimed that the photon is the mutual energy flow. In this article the author updated this claim that the photon is the normalized mutual energy flow. Here the normalization of mutual energy flow will normalize the mutual energy flow to the energy of a photon, which is E = hf. E is the energy of the photon;h is Planck constant;f is the frequency of the light. This normalization is similar to the normalization in quantum mechanics. After this normalization the relation between an electromagnetic wave and photon as a particle becomes clear. This article will prove that the macroscopic wave of an electromagnetic field can be built by thousands of normalized mutual energy flows, which describes the photons. The mutual energy flow is an interaction of the retarded wave and the advanced wave. The retarded wave and the advanced wave satisfy the Maxwell equations.

关键词： Advanced Wave Retarded Wave time-reversal Wave Photon Mutual En-ergy Energy Flow Electromagnetic Fields Normalization Wave-Particle Duality Electron Quantum

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