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Optical-control external phase modulator of terahertz space

A phase modulator, a space-external technology, applied in the direction of instruments, optics, nonlinear optics, etc., to achieve the effect of enhancing resonance strength, improving phase modulation ability, and avoiding difficult processing

Active Publication Date: 2017-11-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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  • Application Information

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Problems solved by technology

However, in addition to amplitude modulation, terahertz wave modulation also needs to achieve phase modulation. However, there are few reports on related high-performance devices. How to realize large-scale and high-speed modulation of phase has become a bottleneck technology in this research field.

Method used

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  • Optical-control external phase modulator of terahertz space
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  • Optical-control external phase modulator of terahertz space

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Embodiment Construction

[0027] The present invention will be described in more detail below in conjunction with the accompanying drawings and examples.

[0028] This specific embodiment provides an optically controlled terahertz space external phase modulator, the structural diagram of which is shown in figure 1 As shown, it includes a semiconductor substrate 1 and an artificial microstructure resonant array 2; the artificial microstructure resonant array 2 is composed of periodically distributed dynamic electromagnetic resonant units, and the unit structure schematic diagram is as follows figure 2 As shown, each resonant unit includes an artificial microstructure 3 and a controllable dynamic switch 4; the artificial microstructure resonant array 2 is an M×N array composed of a plurality of resonant units, wherein M≥4, N≥4; Each row of adjacent artificial microstructures 3 in the artificial microstructure resonant array 2 is connected to each other through two upper and lower transverse branches.

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Abstract

The invention provides an optical-control external phase modulator of terahertz space and belongs to the technical field of electromagnetic function devices. The external phase modulator provided by the invention is composed of a semiconductor substrate, an artificial micro structure and a controllable dynamic switch. Through application of external optical induction, an electric conduction rate and a dielectric constant of a switch material are changed. Hence, an electromagnetic resonance mode of the artificial micro structure can be changed and thus phase modulation of terahertz waves can be achieved. The phase modulator provided by the invention has the advantages that a phase modulation depth of over 100 DEG within a large bandwidth and maximum phase modulation capacity of over 150 DEG can be achieved; micro-fabrication techniques can be used for implementation, and the preparation technology is mature and reliable; and a dynamic phase control device which combines a semiconductor material and an artificial microstructure array is achieved, the switch material can be selected from multiple types of high-performance semiconductor materials, multiple control modes can be selected, and the phase modulator has very high practical application values in fields such as terahertz wireless communication, terahertz spectrum technology and terahertz security check imaging.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic functional devices, and also belongs to the field of communication devices including modulators, filters, photoconductive switches and the like. Background technique [0002] Terahertz wave is a new type of electromagnetic spectrum between photonics and electronics, usually referring to electromagnetic radiation with a frequency within 0.1THz to 10THz. In recent years, thanks to the rapid development of terahertz source and detection technology, terahertz wave-based imaging, spectrum analysis, electronic information, radar positioning and other technical fields have shown great application prospects. At the same time, terahertz wireless communication technology, as one of the important directions in the terahertz field, is currently receiving attention from all over the world. As a wireless communication carrier, terahertz wave has ultra-high bandwidth, good penetration ability (compared ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/015
Inventor 张雅鑫赵运成梁士雄杨梓强
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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