Chemical Route Fabricated Magnetic Structure Exhibiting a Negative Permeability at Infrared Frequencies
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0919-J02-08
Chemical Route Fabricated Magnetic Structure Exhibiting a Negative Permeability at Infrared Frequencies Hui Liu, and Xiaopeng Zhao Institute of Electrorheological Technology, Xi'an, Shaanxi, 710072, China, People's Republic of ABSTRACT We propose a quasi-periodic dendritic resonant magnetic model that can be used for the realization of the negative permeability at infrared frequencies. The numerical simulation exhibits a magnetic response when the incident light is perpendicular to the plane of the model. The copper dendritic structures are prepared by the electro-deposition method. And the transmission spectrum of this dendritic structure shows a magnetic response at infrared frequencies with a maximum transmission –7.95dB. Further studies demonstrate that the magnetic response relate to the fractal dimension of the dendritic structure to a certain extent.
INTRODUCTION
In 1990s, Pendry proposed the artificial split-ring resonators (SRRs) which exhibit a band of negative µ values in spite of being made of nonmagnetic materials [1,2], which evoking the new upsurge of double negative materials studied by Veselago in 1968 [3]. The SRRs can be viewed as an equivalent inductor-capacitor (LC) circuit. If the magnetic field vector H of the incident electromagnetic wave has a component normal to the plane of SRRs, the current in the coil, analogous to an atomic orbital current, lead to a negative permeability [4-6]. However, up to now, the realization of negative µ relies mostly on the artificial periodic SRRs and its transmogrification [7-12], there are few articles studied the randomly structures for the realization of negative permeability [13]. And the investigation focus mainly on the microwave region, a few articles described the negative µ at infrared (IR) and visible-light frequencies [14,15]. Another limitation, which restricted the realization of negative µ at IR and visible-light frequencies, is that they are often based on the special instruments or hash conditions. In this paper, according to the principle of SRRs, we propose a dendritic magnetic response model, which can couple with the incident EM wave and produce a magnetic response related to the negative permeability like SRRs. Then, we fabricate experimentally the copper dendritic structure using chemical electro-deposition method and study its transmission properties in IR region. To our knowledge, it is the first experimental work on negative permeability reported using chemical electro-deposition method. Importantly, this investigation provides a novel approach to the realization of negative permeability even higher frequency.
EXPERIMENTAL DETAILS
The processing steps for the dendritic structure are mainly referred to the Ref. 16. In order to get more tenuous sub-structure, which is a basic demand for the realization of negative permeability at higher frequencies, we design and use a carbon-fiber with a diameter 5µm as the cathode electrode. The anode electrode is an ordinary annular copper electrode (the outer, inner diameter and thi
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