Ultrathin transmission type terahertz circular polarization asymmetric focusing lens

A focusing lens and terahertz technology, applied in the field of terahertz lenses, can solve the problems of large terahertz lenses and difficulties in terahertz devices, and achieve the effects of large structure, easy integration, and low loss

Inactive Publication Date: 2020-10-27
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the exi

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  • Ultrathin transmission type terahertz circular polarization asymmetric focusing lens
  • Ultrathin transmission type terahertz circular polarization asymmetric focusing lens
  • Ultrathin transmission type terahertz circular polarization asymmetric focusing lens

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Embodiment Construction

[0026] In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

[0027] An ultra-thin transmissive terahertz circularly polarized asymmetric focusing lens of the present invention has a periodic structure, including three layers, wherein the first layer is a rectangular metal array layer 1, which is used to adjust the phase of the transmitted light so that it has a focusing phase and The incident circularly polarized light is converted into cross-polarized light; the second layer is a film substrate layer 3, which is used to connect the upper and lower two-layer structures; the third layer is a rectangular metal array layer 2 with a fixed rotation angle of 45°, which is used to break the structural symmetry sex. The rectangular metal array layer one and the rectangular metal array layer one above and below the thin film substrate layer 3 are prepared by photolithography or magnetron sputtering ...

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Abstract

The invention discloses an ultrathin transmission type terahertz circular polarization asymmetric focusing lens. According to the terahertz focusing lens with the double-layer rectangular metal arraystructure and the thin film substrate, asymmetric focusing of ultrathin transmission type terahertz circular polarization light is realized in a terahertz waveband for the first time; a focus can be generated when right-handed rotation circular polarization is incident from the front face, focusing cannot be achieved when right-handed rotation circular polarization is incident from the back face,the symmetry of the structure is broken through superposition of the two layers of rectangular metal structures, and the function which cannot be achieved by a common lens is achieved. The two layersof metal rectangular array structures are attached to the thin film substrate layer, the thickness is only 25.3 mum, and conversion frequency point adjustment and focal length adjustment can be achieved by adjusting structural parameters and structural rotation angles according to actual application occasions and requirements. The lens has the advantages of low loss, ultra-thinness, small size, easiness in integration and the like; and the focusing lens is simple in structure, wide in material source and convenient to process and prepare.

Description

technical field [0001] The invention relates to a terahertz lens, in particular to an ultra-thin transmissive terahertz circularly polarized asymmetric focusing lens. Background technique [0002] Terahertz (THz) waves are electromagnetic waves with a frequency between 0.1THz and 10THz, located between microwaves and far infrared. With the generation of terahertz waves and the development of detection technology, terahertz technology has set off a research boom in the world. Terahertz technology is widely used in fields such as biomedicine, security inspection, and communication because of its strong penetrability, high safety, and good orientation. The research on terahertz technology mainly revolves around three parts, terahertz source, terahertz detection and application research of terahertz functional devices. In order to meet the actual application requirements, researchers have been working hard to develop miniaturized and integrated terahertz systems. Existing ter...

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Application Information

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IPC IPC(8): G02B5/30
CPCG02B5/30
Inventor 臧小飞姚冰双朱亦鸣陈麟谢静雅
Owner UNIV OF SHANGHAI FOR SCI & TECH
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