Controllable electromagnetic wave transmittance structure based on sub-wave length metal double gratings and its preparation method

An electromagnetic wave and sub-wavelength technology, applied in the field of adjustable electromagnetic wave transmission structure, to achieve the effect of easy preparation, simple structure and easy acquisition

Inactive Publication Date: 2008-05-28
NANJING UNIV
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Problems solved by technology

[0008] In order to solve the problem that there is no simple way to realize the adjustable electromagnetic wave transmission spectrum in the prior art, t

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  • Controllable electromagnetic wave transmittance structure based on sub-wave length metal double gratings and its preparation method

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Embodiment Construction

[0026] The present invention can be realized through the following technical measures.

[0027] The materials involved in the present invention are metals with low loss, generally silver, aluminum or gold can be used.

[0028] For the microwave band and the mid-infrared band, due to the long wavelength, the structural parameters can take larger values, and the preparation accuracy is not high. Metal etching or other processes can be used to fabricate one-dimensional periodic gratings. Then arrange the two gratings in parallel, and adjust the spacing and lateral offset between adjacent gratings through the micro-manipulation system.

[0029]For the near-infrared and visible light wave bands, due to the short wavelength, the required structural parameters are small, and the precision requirements are high, a single-layer metal film can be fabricated by magnetron sputtering and other processes, and then a single-layer metal film can be fabricated by focused ion beam etching (FIB)...

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Abstract

The invention discloses an adjustable electromagnetic wave transmitting frame, which is based on sub-wavelength metal double gratings and comprises two single layer sub-wavelength metal gratings, wherein the two single layer sub-wavelength metal gratings are arranged in parallel, distance and transverse displacement of the gratings can be adjusted. The frame is based on a waveguide module of metal surface plasmons, incident electromagnetic waves which are adjustable are p-polarizations, a period of a grating is less than wave length of the electromagnetic waves, and a slot width is less than half-wave length of a electromagnetic wave. Coupling effects which are through evanescent field between the gratings can be adjusted through changing the distance G and the transverse displacement L which are between neighboring metal gratings, thereby electromagnetic transmitting property of a component can be changed, and the purpose for adjusting electromagnetic wave transmitting spectra can be achieved.

Description

technical field [0001] The invention relates to an electromagnetic wave transmission structure, in particular to an adjustable electromagnetic wave transmission structure based on sub-wavelength metal double gratings. Background technique [0002] In 1998, T.W.Ebbesen et al., a research team cooperating with the United States, France and Germany, published an article entitled "Extraordinary transmission through subwavelength hole arrays" in Nature. They found that when an electromagnetic wave is incident on a metal film with a periodic hole array of subwavelength size, the energy of electromagnetic waves of certain wavelengths passing through the metal film will be much greater than the result obtained by the small hole diffraction theory, forming a series of The transmission peak, which is the so-called anomalous transmission phenomenon in subwavelength aperture array metal thin films. At that time, this phenomenon was explained that through the interaction between electro...

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Application Information

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IPC IPC(8): G02B5/18H01P1/00
Inventor 王慧田程晨陈璟武齐阳任芳芳许吉樊亚仙
Owner NANJING UNIV
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