Reflection type terahertz tunable polarization controller

A polarization control, terahertz technology, applied in the terahertz application field, can solve the problems of inability to meet the reflective terahertz spectrum and imaging system, high voltage, and achieve the effect of expanding the application range, low loss, and high extinction ratio

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Problems solved by technology

This method utilizes the birefringence property controlled by the electric field, and the structure is simple, but the voltage is relatively high.
In addition, the above-mentioned devices are all transmission devices, which cannot meet the requirements of reflective terahertz spectroscopy and imaging systems, so the development of reflective quasi-phase control devices has very important application value

Method used

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  • Reflection type terahertz tunable polarization controller
  • Reflection type terahertz tunable polarization controller
  • Reflection type terahertz tunable polarization controller

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Embodiment Construction

[0017] The working process of the present invention is illustrated by an example of a reflective terahertz tunable polarization controller working near 1THz:

[0018] The pitch of the metal grid polarizer is 10 μm, the duty ratio is 0.3, the thickness is 4 μm, the overall size of the device is 3 mm×2 mm, and the height is 1 mm. The terahertz signal emitted by the photoconductive antenna is incident on the metal grid polarizer, such as figure 1 , TE wave reflection, TM wave transmission, transmission polarization extinction ratio 22.86dB. When the electrode voltage is lower than the threshold voltage of 3.75V, the liquid crystal in the device points parallel to the metal grid polarizer. At this time, the refractive index of the liquid crystal in the terahertz band is 1.62, and the phase difference between the TM wave and the TE wave is -242.6865°. When a voltage is applied to the electrodes, the orientation of the liquid crystal in the device turns to be perpendicular to the ...

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Abstract

The invention discloses a reflection type terahertz tunable polarization controller and a control method thereof. The reflection type terahertz tunable polarization controller is mainly composed of a metal gate polarizer, an anti-reflection film, liquid crystal and a metal reflector. The phase difference of two beams of orthogonal polarized light is changed through continuously changing the refractive index of the liquid crystal between the metal gate polarizer and the metal reflector by an extra electric field, and thus adjustable phase delay in a range of 0 - 2 pi in a frequency range of 1 terahertz (THz) can be achieved. According to the reflection type terahertz tunable polarization controller, a reflection type structure is used, the application range of a terahertz system is extended, and the reflection type terahertz tunable polarization controller has the advantages of being high in extinction ratio, small in consumption, simple in structure, and favorable for miniaturization and integration.

Description

technical field [0001] The invention belongs to the technical field of terahertz applications, and in particular relates to a terahertz wave tunable polarization control device and a control method thereof. Background technique [0002] Terahertz (THz, 1THz=10 12 THz) waves refer to electromagnetic waves with a frequency in the range of 0.1-10THz (corresponding to a wavelength of 3mm-30μm). This wave 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. Terahertz functional devices such as filters, switches, beam splitters, polarizers, and phase retarders are important components in terahertz application systems, among which terahertz p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1333
Inventor 牛超常胜江
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