Terahertz magneto-optical polarization converter

Abstract

The invention discloses a terahertz magneto-optical polarization converter. The terahertz magneto-optical polarization converter is formed by a rectangular metal hole array and an orthogonal rectangular metal hole array which are attached to the two sides of YIG ferrite, and the terahertz-wave magneto-optical linear polarization state conversion and unidirectional transmission functions at the normal temperature and under a weak bias magnetic field are achieved. Through the F-P resonance and mode selecting effect formed between the two rectangular metal hole arrays, original weak faraday rotation effect of the YIG ferrite is enhanced, and the linear-polarization-state conversion rate of the device is increased. The working frequency of the device ranges from 0.1 THz to 1.5 THz, the highesttransmittance and the polarization conversion rate are larger than 70%, a Q value is larger than 200, and the polarization extinction ratio is larger than 60 dB. Through the high Q value and comb-shaped frequency spectrum output of the device, filtering, wavelength division multiplexing, signal processing and the like of the device in terahertz wideband communication have the application value. Meanwhile, the functions of the high transmittance, linear polarization selection, high-polarization-degree linear polarization state conversion and unidirectional transmission of the device are achieved, and a guarantee is provided for detection signal-to-noise ratio improvement and crosstalk reduction.

Description

technical field [0001] The invention belongs to the field of terahertz science and technology, and in particular relates to a high transmittance, linear polarization state conversion, linear polarization selection and unidirectional transmission device. Background technique [0002] Terahertz wave refers to the frequency between 0.1-10THz (1THz=10 12 THz, corresponding to electromagnetic waves with a wavelength in the range of 3 mm to 30 μm, this band is between microwaves and light waves, and is an intersecting field between electronics and photonics. Due to its special position in the electromagnetic spectrum, terahertz waves have many superior characteristics such as perspective, safety, and high signal-to-noise ratio, and have very important academic and application values ​​in the fields of spectroscopy, imaging, and communication. These terahertz application systems are inseparable from the support of terahertz functional components such as filtering, modulation, phas...

AI Technical Summary

Problems solved by technology

[0004] To sum up, on the one hand, the development of terahertz application systems has an urgent demand for the development of high-performance terahertz magneto-optical polarization conversion devices; It is in its infancy. At present, such devices cannot meet the actual needs of the application system in terms of operating temperature, external magnetic field, polarization conversion rate, extinction ratio, insertion loss, and operating bandwidth. It is urgent to develop high extinction ratio with weak external magnetic field and normal temperature operation. , low-loss, high-efficiency terahertz magneto-optical polarization conversion device

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