Reflection-type spatial electro-optical modulator based on graphene

Abstract

The invention provides a reflection-type spatial electro-optical modulator based on graphene, and relates to electro-optical modulators. A spatial optical coupling module and a waveguide type electro-optical modulation module are arranged; the spatial optical coupling module is provided with an optical transparent prism, and the waveguide type electro-optical modulation module is provided with a dielectric upper cladding layer, a metal upper external electrode, a graphene upper electrode, an electro-optical dielectric core layer, a metal lower external electrode, a graphene lower electrode anda dielectric lower substrate. When the waveguide type electro-optical modulation module works under the driving of external voltage, modulation of spatial light waves can be achieved. A full-dielectric optical waveguide is used, so that the quality factor of the modulator is high compared with a traditional spatial electro-optical modulator, the resonance line width is small, and it is hopeful toobtain small half-wave voltage; compared with the traditional spatial electro-optical modulator based on surface plasmon resonance, the modulator can act on transverse electric waves or transverse magnetic waves and has no polarization dependence.

Description

technical field [0001] The invention relates to an electro-optic modulation device, in particular to a graphene-based reflective spatial electro-optic modulator. Background technique [0002] With the rapid development of today's information technology, optoelectronic information technology that uses light as a tool for information transmission, storage, and processing has been widely used. An optical modulator is a device that superimposes an information-carrying signal onto a carrier light wave. According to the working principle, optical modulators can be divided into acousto-optic modulators, magneto-optical modulators, electro-absorption modulators and electro-optic modulators. The electro-optical modulation can be directly combined with the circuit communication system, which is the most mature and widely used technology. [0003] The working principle of the traditional electro-optic modulator is to use the linear electro-optic effect of the medium, that is, the Poc...

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Problems solved by technology

However, the most commonly used indium tin oxide has a series of disadvantages, including expensive, difficult to recycle, toxic, and the material is a brittle material that is easily damaged due to distortion; the sheet resistance of carbon nanotube films is generally too high; Conductive polymers also have many problems, such as complex synthesis steps, low solubility, narrow light transmission frequency band, and poor chemical stability in air (reference: Han Yuanyuan. High-efficiency organic light-emitting diodes based on graphene transparent electrodes Research [D]. Soochow University 2014)

In addition, since the above-mentioned traditional transparent electrodes are composed of bulk materials, the introduction of electrodes will interfere with the light transmission characteristics in the model, resulting in poor electro-optic integration.

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