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Electric control polarization modulator based on NbSe2-metal multilayer structure

A polarization modulator, multi-layer structure technology, applied in instruments, nonlinear optics, optics, etc., can solve problems such as narrow modulation bandwidth

Pending Publication Date: 2022-02-11
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The embodiment of the present invention provides an electrically controlled polarization modulator based on NbSe2-metal multilayer structure, which aims to solve the problem of narrow modulation bandwidth existing in the modulation element in the prior art when modulating electromagnetic waves

Method used

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  • Electric control polarization modulator based on NbSe2-metal multilayer structure
  • Electric control polarization modulator based on NbSe2-metal multilayer structure
  • Electric control polarization modulator based on NbSe2-metal multilayer structure

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Embodiment 1

[0032] Using the first electrode 31 as the positive pole and the second electrode 32 as the negative pole, and applying an external voltage, the degree of polarization of the modulated electromagnetic wave increases, the modulation depth increases slightly, and elliptically polarized light is generated.

Embodiment 2

[0034] Using the first electrode 31 as the positive pole and the third electrode 41 as the negative pole, and applying an external voltage, the degree of polarization of the modulated electromagnetic wave increases, the modulation depth increases, and linearly polarized light is generated.

Embodiment 3

[0036] The first electrode 31 is used as the positive pole, the second electrode 32 is used as the negative pole, the third electrode 41 is used as the positive pole, and the fourth electrode 42 is used as the negative pole, and an external voltage is applied. , and the maximum modulation depth can be achieved, thus generating stronger linearly polarized light.

[0037] Wherein, in the above three embodiments, an external voltage can be applied through a programmable DC power supply, so as to apply a DC voltage required for electrical control between the metal ring electrodes, and the voltage range is 0-30V.

[0038] At present, the control of electromagnetic waves with wavelengths from millimeter waves to visible light can be realized through methods such as magnetic control, optical control, and electric control. Usually, the modulation speed of the magnetron method is slow (the maximum modulation speed is only on the order of microseconds), and the device size is large, whi...

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Abstract

The invention discloses an electric control polarization modulator based on a NbSe2-metal multilayer structure. The electric control polarization modulator comprises a substrate, an NbSe2 film layer arranged on the substrate, a first electrode pair arranged on the upper end surface of the NbSe2 film layer and a second electrode pair arranged on the lower end surface of the substrate, wherein the NbSe2 film layer is formed by laminating a plurality of layers of NbSe2 films, the first electrode pair is composed of a first electrode and a second electrode, the first electrode and the second electrode are combined to form a metal annular electrode, the second electrode pair is composed of a third electrode and a fourth electrode, the third electrode and the fourth electrode are combined to form a metal annular electrode, and voltage is applied to the first electrode pair and the second electrode pair for electric control so as to actively modulate electromagnetic waves. According to the electronic control polarization modulator, the electronic control polarization modulator is prepared based on the NbSe2 film layer, the polarization state of electromagnetic waves from the visible light wave band to the millimeter wave band can be dynamically modulated, the modulation depth can be increased by applying an external electric field through the metal annular electrode, the modulation depth is made to be uniform, and the bandwidth for modulating the electromagnetic waves is improved.

Description

technical field [0001] The invention relates to the technical field of modulation components, in particular to an electrically controlled polarization modulator based on a NbSe2-metal multilayer structure. Background technique [0002] Two-dimensional layered materials have very excellent optical properties. A special molecular composition of two-dimensional materials, based on the structure of the main atomic chain as the main axis, has obvious anisotropic properties. In addition, based on the piezoelectric effect of the material, along the When an additional bias voltage is applied in the direction of the main atomic chain, the main atomic chain can be stretched, so as to realize the active control of the material structure. Therefore, the polarization selection and modulation of the electromagnetic wave incident on the material can be realized through an external electric field. The polarization modulator of two-dimensional layered materials based on this characteristic h...

Claims

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Application Information

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IPC IPC(8): G02F1/01G02F1/00
CPCG02F1/0102G02F1/0072G02F1/0063
Inventor 张敏康柳宋琦梁华伟谢心如陈润王嘉彤刘佳睿陈俊展
Owner SHENZHEN UNIV
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