Almost perfect absorbing structure for wide wave band

A near-perfect absorption and wide-band technology, which is applied in the field of electromagnetic wave absorption structures, can solve the problems that the positive effect of near-perfect absorption has not been proposed, and achieve the effects of easy processing, excellent absorption bandwidth and efficiency, and expansion of absorption bandwidth

Inactive Publication Date: 2010-06-16
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

But no positive role for near-perfect absorption has been suggested in metal particle-based solar cell research

Method used

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  • Almost perfect absorbing structure for wide wave band
  • Almost perfect absorbing structure for wide wave band
  • Almost perfect absorbing structure for wide wave band

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Embodiment

[0026] A fabrication process of a near-perfect absorption structure for broadband electromagnetic waves using a periodic metal nanosphere array is as follows:

[0027] (1) Select the visible light band, the dielectric absorbing material selects polymer solar cell photosensitive material P3HT:PCBM, and its absorption range is 350nm-630nm; the metal material selects silver and aluminum;

[0028] (2) Fabrication of the device structure: a. Utilize metal aluminum to vapor-deposit a metal film with a thickness greater than 1m on the quartz base material, so that electromagnetic waves cannot be transmitted; b. Spin-coat a 100nm thick absorption medium material on the metal film; c. Using micro-processing technology, such as self-assembly technology, to make silver metal nanosphere particles on the absorption medium layer;

[0029] (3) The minimum wavelength of visible light is 400nm, so the diameter d of the metal ball particles is less than 400nm;

[0030] (4) Broad-band near-perf...

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Abstract

The invention relates to an almost perfect absorbing structure for wide wave band, which comprises the following steps: (1) determining absorbing material and metal material according to the incoming wave frequency band; (2) manufacturing structure of apparatus; (3) determining the range of diameter d of metal spherical particles according to the local effect of plasma on the surface of the metalspherical particles; (4) determining the distribution and range of period p according to the electromagnetic resonation effect among metal spherical particles-medium-metal film; and (5) optimizing particle diameter d and distribution period p to realize expansion of the bandwidth of the entire apparatus. The invention realizes almost perfect absorbing function on wide wave band within visible light range.

Description

technical field [0001] The invention relates to an electromagnetic wave absorbing structure, in particular to a novel near-perfect absorbing structure of a wide-band electromagnetic wave. Background technique [0002] In 2008, D.R.Smith et al. found that the combination of split ring resonators and short metal wire pairs can achieve near-perfect narrow-band absorption. Perfect absorption means that the absorption efficiency of the device for electromagnetic waves is 100%, and the reflected and transmitted energy is all zero. This discovery has aroused people's attention. The structure of various split rings combined with the underlying metal and a layer of dielectric inserted in the middle has been studied. It is found that the electrical resonance of the split ring itself and the split ring and Magnetic resonance between underlying metals. These resonances lead to a good match between the equivalent impedance of the entire structure and the vacuum, and the reflected electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/48H01L31/18
CPCY02E10/50Y02E10/549Y02P70/50
Inventor 杜春雷高洪涛夏良平董小春
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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