Tunable terahertz beam splitter

A beam splitter and terahertz technology, which is applied in the field of terahertz optoelectronics, can solve problems such as tunable terahertz beam splitters that have not been recorded, and achieve the effects of high integration, simple working mode, and high modulation efficiency

Inactive Publication Date: 2018-01-16
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Until recently, the focusing modulation of out-of-plane terahertz beams based on the reflective lens model of graphene metasurfaces has not been reported, and the research on out-of-plane graphene tunable terahertz beam splitters has not been documented at home and abroad.

Method used

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  • Tunable terahertz beam splitter
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  • Tunable terahertz beam splitter

Examples

Experimental program
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Effect test

Embodiment 1

[0018] The central working frequency of the terahertz beam is 3THz, and the polarization type is TM polarization. Copper substrate transmission grating thickness h Cu = 36μm, the width of the central slit and side slit is w c = 8μm and w s =14μm, the spacing between the central slit and the side slit l=93μm, the number of periodic grooves is 20, the groove width w g =11μm, groove depth t g =14μm, period Λ g = 65 μm. The chemical potential of single-layer graphene sheets is tuned from 0.1 eV to 0.9 eV.

[0019] Taking the model of this embodiment as an example, the implementation effect of dual-beam modulation of a tunable terahertz beam splitter with a central operating frequency of 3THZ in the present invention is obtained through simulation. Such as figure 2 As shown, when the substrate grating is not covered with graphene, the terahertz wave can produce a double beam splitting effect through diffraction, and when the substrate grating is covered with a single layer ...

Embodiment 2

[0021] The working frequency of the terahertz beam is 3THz, and the polarization type is TM polarization. Copper substrate transmission grating thickness h Cu = 36μm, the width of the central slit and side slit is w c = 8μm and w s =14μm, the spacing between the central slit and the side slit l=93μm, the number of periodic grooves is 20, the groove width w g =11μm, groove depth t g =14μm, period Λ g = 85 μm. The chemical potential of single-layer graphene sheets is tuned from 0.1 eV to 0.9 eV.

[0022] Taking the model of this embodiment as an example, the implementation effect of three-beam modulation of a tunable terahertz beam splitter with a center operating frequency of 3THZ in the present invention is obtained through simulation. Such as image 3 As shown, when the substrate grating is not covered with graphene, the terahertz wave can produce a three-beam beam splitting effect through diffraction, and when the substrate grating is covered with a single layer of gr...

Embodiment 3

[0024] The central working frequency of the terahertz beam is 2THz, and the polarization type is TM polarization. Copper substrate transmission grating thickness h Cu = 36μm, the width of the central slit and side slit is w c = 12μm and w s = 21 μm, the spacing between the central slit and the side slit l = 140 μm, the number of periodic grooves is 20, the groove width w g = 16μm, groove depth t g =21μm, period Λ g 98 μm (two-beam modulation) and 128 μm (three-beam modulation), respectively. The chemical potential of single-layer graphene sheets is tuned from 0.1 eV to 0.9 eV.

[0025] Taking the model of this embodiment as an example, the implementation effect of the two-beam and three-beam modulation of the tunable terahertz beam splitter with a central operating frequency of 2THZ in the present invention is obtained through simulation, as shown in Figure 4 shown. From Figure 4 In (a) and (b), it can be seen that when the period Λ g When the chemical potential of ...

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Abstract

The invention discloses a tunable terahertz beam splitter comprising a copper-substrate transmission type grating 1, an aluminum-oxide insulating layer 2, a single-layer graphene sheet 3 and a metal electrode 4. The aluminum-oxide insulating layer 2 is plated on the emergent surface of the copper-substrate transmission type grating 1; the single-layer graphene sheet 3 covers the aluminum-oxide insulating layer 2; and the metal electrode 4 is plated on the single-layer graphene sheet 3. Two side seams and one central beam are formed in the copper-substrate transmission type grating 1; the central beam is arranged at the center of the copper-substrate transmission type grating 1; and the two side beams are arranged at the two sides of the central beam respectively and the distances between the two side beams and the central beam are 1. Grooves that are distributed uniformly at equal intervals with a cycle of lambda g are formed in the emergent surface of the copper-substrate transmissiontype grating 1. According to the tunable terahertz beam splitter disclosed by the invention, a novel technical means is provided for terahertz beam regulation in out-of-plane free space; and thus thebeam splitter has the great potential application value in fields of terahertz communication, imaging and sensing.

Description

technical field [0001] The invention belongs to the technical field of terahertz optoelectronics, and in particular relates to a tunable terahertz beam splitter. Background technique [0002] In the terahertz band, graphene is similar to the Drude model material and shows superior electrical and optical properties, which can be effectively controlled by changing the chemical potential of graphene. Based on the unique properties of graphene, many tunable terahertz devices based on graphene, such as absorbers, polarizers, amplitude and phase modulators, filters, antennas, and stealth devices, have been intensively studied in the past decade. These devices are simple, efficient, and compact, showing attractive application prospects in the fields of biosensing, communication, national defense, and spectral analysis. [0003] Recently, the focusing and waveform modulation of beams in the infrared and terahertz bands by graphene has attracted the attention of the scientific commu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/125
Inventor 蒋立勇蒋剑莉张伟梁爽
Owner NANJING UNIV OF SCI & TECH
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