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TM-pass polarization filter

A polarization filter and waveguide technology, used in the field of optical communication and integrated photonic devices, can solve the problems of poor transmission effect and transmittance, only tens to hundreds of microns, etc., and achieve high transmittance and long transmission distance. , the effect of high extinction ratio

Pending Publication Date: 2022-06-24
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the introduction and development of photonic crystal waveguides and surface plasmon waveguides, highly integrated, low-loss waveguide devices have received widespread attention. However, due to the huge loss caused by metals and the edge effect of the medium, optical waveguide devices are difficult While maintaining the mode confinement ability, the long transmission distance is maintained, while the transmission distance of the traditional hybrid plasmonic waveguide is only tens to hundreds of microns, so the transmission effect and transmission of the traditional hybrid plasmonic waveguide polarization filter rate is not superior

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A TM pass polarization filter, and the parameters are set as follows: the width of the arch-shaped input waveguide is 450 nm, the height of its rectangular part is 175 nm, and the length is 1500 nm; the width of the arch-shaped hybrid plasmon waveguide is 150 nm, and its rectangular The height of the part is 325nm and the length is 3000nm; the total height of the wedge-shaped mode conversion region is 400nm and the total length is 1000nm; the height of the low refractive index layer is determined to be 50nm; the length of the active metal layer is 4000nm, and the width of the metal layer is determined to be 4000nm, Height is 100nm.

[0041] At the incident wavelength λ=1550nm, the above-mentioned polarization filter is used for experiments, and the field distribution of the xz cross-section of the arched hybrid plasmon waveguide is as follows Figure 4 , it can be seen from the figure that the TM hybrid plasmonic mode is well confined in the low refractive index region ...

Embodiment 2

[0044] Let the width w of the arch-cylindrical hybrid plasmon waveguide 4 Change in the range of 100nm to 200nm, while keeping other dimensions in Example 1 unchanged, to obtain the transmittances of TM mode and TE mode, such as Figure 5 shown, it can be seen from the figure that the w 4 = In the range of 100nm to 200nm, the filter can maintain high transmittance of TM and low transmittance of TE.

Embodiment 3

[0046] Let the length L of the arch-cylindrical hybrid plasmon waveguide n Change in the range of 2500nm to 3500nm, while keeping other dimensions in Example 1 unchanged, to obtain the transmittances of TM mode and TE mode, such as Image 6 shown, it can be seen from the figure that the L n = In the range of 2500nm to 3500nm, the filter can maintain the high transmittance of TM and the low transmittance of TE.

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Abstract

The TM-pass polarization filter comprises a substrate, supporting layers, a high-refractive-index waveguide area, spacing layers and metal layers, the high-refractive-index waveguide area is arranged in the middle of the upper surface of the substrate, and the supporting layers are arranged on the upper surface of the substrate and located on the two sides of the high-refractive-index waveguide area. The metal layer is arranged above the supporting layer and is supported above the high-refractive-index waveguide region through the supporting layer, and the spacing layer is arranged between the metal layer and the supporting layer; the high-refractive-index waveguide region comprises an arch-column-shaped input waveguide, an arch-column-shaped mixed plasmon waveguide and an arch-column-shaped output waveguide which are connected in sequence, the size of the arch-column-shaped input waveguide is consistent with that of the arch-column-shaped output waveguide, and the width of the arch-column-shaped mixed plasmon waveguide is smaller than that of the arch-column-shaped input waveguide and that of the arch-column-shaped output waveguide. According to the invention, the TE mode can be effectively filtered, the transmission of the TM mode with long transmission distance can be realized, and the loss caused by the corner effect can be effectively avoided.

Description

technical field [0001] The invention relates to a compact high-performance TM pass polarization filter, which belongs to the technical field of optical communication and integrated photonic devices. Background technique [0002] With the rapid development of ultra-high-bandwidth, high-speed, wide-bandwidth, and ultra-stable optical communication systems, the integration, miniaturization and compactness of optical waveguide devices have become one of the important trends in scientific and technological research and applications. Since the proposal and development of photonic crystal waveguides and surface plasmon waveguides, high-integration and low-loss waveguide devices have received extensive attention. However, due to the huge loss caused by metals and the corner effect of the medium, optical waveguide devices are difficult to achieve. The mode confinement capability is maintained while maintaining a long transmission distance, while the transmission distance of the tradi...

Claims

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Application Information

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IPC IPC(8): G02B6/12G02B6/122
CPCG02B6/12002G02B6/1226
Inventor 许吉杨昕泽周天诺苏杭阳乐邱崇涛刘宁陆云清
Owner NANJING UNIV OF POSTS & TELECOMM
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