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Dynamic modulation method for phase of terahertz wave

A dynamic modulation and terahertz technology, applied in the field of optics, can solve the problems of inability to realize wavefront modulation, complex production, slow speed, etc., and achieve the effect of stable modulation effect, simple modulation method and continuous phase

Inactive Publication Date: 2019-06-14
CAPITAL NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology can only realize the switching of two states before and after the phase change, such as focusing and non-focusing of the lens, and cannot realize arbitrary wavefront modulation
Secondly, due to the slow temperature change and response, the speed of this modulation method is relatively slow, and it needs to be etched, which is more complicated in production.

Method used

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  • Dynamic modulation method for phase of terahertz wave
  • Dynamic modulation method for phase of terahertz wave
  • Dynamic modulation method for phase of terahertz wave

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no. 1 approach

[0034] The first embodiment of the present invention relates to a dynamic modulation method of terahertz wave phase, which is used to realize dynamic display of holographic images. Specifically, semiconductors are used to realize metal properties, and the polarization state of terahertz waves is converted, thereby realizing dynamic modulation of the phase of terahertz waves. Based on the good modulation effect of metals on terahertz waves, the mechanism of dynamic modulation of terahertz waves in the embodiments of the present invention is to change the properties of non-metallic materials between metal and non-metal states. For example, the semiconductor itself is non-metallic, but it will generate carriers under light to exhibit metallic characteristics, and modulate the phase of the terahertz wave. When the light is removed, the carriers revert to their initial state and assume a non-metallic state again.

[0035] figure 1 It is a schematic diagram of the dynamic modulati...

no. 2 approach

[0089] The second embodiment of the present invention relates to a dynamic modulation method of a terahertz wave phase, which is used to realize longitudinal dynamic zooming of a focusing lens. The method includes:

[0090] S11. Determine the phase distribution of the holographic image of the target terahertz wave.

[0091] S12. Pre-design a modulation pattern according to the phase distribution of the holographic image.

[0092] S13. Generate a pre-designed modulation pattern by using the spatial light modulator.

[0093] S14. The pump light is irradiated on the semiconductor through the modulated pattern, so as to generate carrier distribution on the semiconductor.

[0094] S15. The carrier distribution produces a conductivity distribution, which makes the semiconductor have metallic characteristics.

[0095] S16. The initial terahertz wave irradiates the semiconductor, and the phase is modulated by the semiconductor to obtain the target terahertz wave.

[0096] In this ...

no. 3 approach

[0100] The third embodiment of the present invention relates to a dynamic modulation method of a terahertz wave phase, which is used to realize lateral dynamic zooming of a focusing lens. The method includes:

[0101] S11. Determine the phase distribution of the holographic image of the target terahertz wave.

[0102] S12. Pre-design a modulation pattern according to the phase distribution of the holographic image.

[0103] S13. Using the dynamic pattern modulator to generate a pre-designed modulation pattern.

[0104] S14. The pump light is irradiated on the semiconductor through the modulated pattern, so as to generate carrier distribution on the semiconductor.

[0105] S15. The carrier distribution produces a conductivity distribution, which makes the semiconductor have metallic properties.

[0106] S16. The initial terahertz wave irradiates the semiconductor, and the phase is modulated by the semiconductor to obtain the target terahertz wave.

[0107] In this embodimen...

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Abstract

An embodiment of the invention relates to the technical field of information processing, and discloses a dynamic modulation method for a phase of a terahertz wave. The method comprises the following steps that a predesigned modulation pattern is generated by utilizing a spatial light modulator; pump light is irradiated on a semiconductor through the modulation pattern, and carrier distribution isgenerated on the semiconductor; the carrier distribution generates electric conductivity distribution, so that the semiconductor has metallic properties; and an initial terahertz wave irradiates the semiconductor, and the phase is modulated by the semiconductor to obtain a target terahertz wave, wherein the modulation pattern comprises a plurality of structural units which are arranged in a discrete manner. According to the embodiment, the different modulation patterns are dynamically generated, so that a pure-phase dynamic modulation metasurface for the terahertz wave is realized, the modulation pattern adopts a geometrical phase modulation method, the modulation mode is simple, the modulation effect is stable, and continuous, fast and accurate modulation of the phase is realized while the same amplitude modulation is guaranteed.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a dynamic modulation method of terahertz wave phase. Background technique [0002] Terahertz technology is known as one of the technologies that will change the future world. It is widely used in security inspection, non-destructive testing, wireless communication and many other fields. In the past ten years, terahertz source and detector have developed rapidly as two terminal devices. In contrast, the development of intermediate devices for active modulation of terahertz is slow, and these devices are very important for expanding terahertz applications, such as information encryption, transmission and storage, terahertz beam shaping, focusing and imaging, etc. Wait. In the visible light band, spatial light modulators can programmably modify the spatial intensity and phase distribution of light beams, and are widely used in optical information processing, imaging, and communica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01G02F1/015
Inventor 张岩郭劲英
Owner CAPITAL NORMAL UNIVERSITY
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