On-chip broadband terahertz unidirectional transmitter combining gradual-change metasurface and sub-wavelength waveguide
A one-way transmission and metasurface technology, applied in waveguide devices, electrical components, circuits, etc., can solve the problems of device miniaturization, narrow working bandwidth and large-scale practical integration of devices, and achieve simple, easy to control and low cost , the effect of high forward-reverse transmittance ratio
Active Publication Date: 2019-01-29
NANKAI UNIV
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Problems solved by technology
At present, there are few researches on functional devices in the terahertz frequency band in China, and the miniaturization and narrow working bandwidth of devices hinder large-scale practical integration of devices.
Method used
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Embodiment
[0047] The specific implementation steps of an on-chip broadband terahertz unidirectional transmission device combined with graded metasurface and subwavelength waveguide are as follows:
[0048] (1) Use numerical simulation to simulate the reflection phase of antennas with different lengths; then design 52 metal antennas on the surface of the waveguide according to the momentum required for mode conversion, and the phase difference between adjacent antennas The interval Λx=30 μm.
[0049] (2) Use laser etching technology to etch a cross-section of 200*50μm on a sheet material with a thickness of 50μm 2 The rectangular waveguide, the material property is x tangential lithium niobate;
[0050] (3) Using ultraviolet lithography technology and magnetron sputtering technology, a 100nm thick metal antenna is plated on a fixed position on the surface of the rectangular waveguide. The midpoint of the antenna is offset from the centerline of the rectangular waveguide by 20 μm and ro...
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Abstract
The invention discloses an on-chip broadband terahertz unidirectional transmitter combining a gradual-change metasurface and a sub-wavelength waveguide, which aims to reduce the severe damage caused by reflected light returning back to an integrated laser to the laser, particularly the influence generated under high optical power, and solves the problems such as optical path signal interference caused by the reflection of other devices in the optical path. The adopted scheme is that the sub-wavelength rectangular waveguide is coated with an antenna array metasurface with a gradual-change structure at a specific position. The metasurface generates a strong interaction with the waveguide mode and provides additional unidirectional momentum compensation for the waveguide mode, thereby realizing waveguide mode conversion and unidirectional transmission of energy. The on-chip broadband terahertz unidirectional transmitter has the characteristics of simplicity, easy control, small volume andsize, high forward-reverse transmission ratio and the like, and is conducive to the development and application of terahertz integrated optics.
Description
technical field [0001] The invention relates to a miniaturized terahertz band functional device, especially a broadband terahertz one-way transmission device suitable for future communication. Background technique [0002] Since the special position of the terahertz wave frequency band is between microwave and infrared rays, it has a series of special properties, such as: transient, strong penetration, low energy, and safety for biological detection, etc., which makes terahertz waves in National defense security, biomolecular monitoring, non-destructive imaging, medical diagnosis, security inspection and other fields have broad application prospects. With the continuous development of wireless communication requirements and technologies in the future, it is necessary to continuously develop new spectrum resources and increase the information transmission rate. Terahertz frequency band (0.1-10THz) spectrum resources have large-capacity and high-bandwidth transmission capabili...
Claims
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Login to View More IPC IPC(8): H01P1/32H01P11/00
CPCH01P1/32H01P11/00
Inventor 吴强王日德张琦
Owner NANKAI UNIV