Terahertz isolator based on photonic crystal heterojunction

A photonic crystal and heterojunction technology, applied in the field of terahertz isolators, can solve problems such as lack of terahertz isolators, and achieve the effect of high forward transmittance and high reverse isolation

Active Publication Date: 2014-02-19
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

[0005] However, the technical solution adopted by the above-mentioned magnetic surface plasmon waveguide terahertz isolator device requires extreme conditions such as low temperature and strong magnetic field.
Therefore, the existing te

Method used

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  • Terahertz isolator based on photonic crystal heterojunction
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  • Terahertz isolator based on photonic crystal heterojunction

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Embodiment

[0022] High-resistance monocrystalline silicon is a suitable insulating material in the terahertz band, and has good processing properties, so high-resistance silicon is generally selected to prepare such terahertz isolators by mechanical inversion processing, electrochemical corrosion and other methods. Mechanical inversion processing adopts a method similar to the early grating processing method, and uses a stepping motor to mechanically carve the required photonic crystal heterojunction 1 on the anti-vibration table. The electrochemical etching method adopts a method similar to the corrosion processing of integrated circuits. First, a corrosion mask is made, and photoresist is coated on the aluminum film. The excess photoresist is washed away, and the required photonic crystal heterojunction 1 is processed by electrochemical etching with hydrofluoric acid.

[0023] figure 1 It is a schematic structural diagram of a terahertz isolator based on a photonic crystal heterojunct...

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Abstract

The invention discloses a terahertz isolator based on a photonic crystal heterojunction. The terahertz isolator comprises the photonic crystal heterojunction which is composed of a first photonic crystal and a second photonic crystal and used for receiving incidence of terahertz waves, an incidence port used for leading in of the terahertz waves, and an exit port used for leading out of the terahertz waves, wherein the incidence port and the exit port are respectively arranged on the two sides of the photonic crystal heterojunction. The first photonic crystal and the second photonic crystal are respectively provided with a plurality of small holes and large holes. On the basis of the same period of the first photonic crystal and the second photonic crystal, the effect of transmission and isolation is achieved by controlling the radius ratio of the large holes to the small holes, the size of the incidence port, the size of the exit port and the interface shape, and high forward-direction transmittivity and high reverse isolation are achieved. The terahertz isolator based on the photonic crystal heterojunction can normally work under the normal temperature and normal state condition without the extreme condition such as low temperature and magnetic fields.

Description

technical field [0001] The invention relates to a terahertz isolator, in particular to a terahertz isolator based on a photonic crystal heterojunction. Background technique [0002] Terahertz is a new type of radiation source with many unique advantages. The frequency is in the range of 0.1THz to 10THz, and the wavelength is in the range of 0.03 to 3mm, which is between microwave and infrared. [0003] As a cutting-edge emerging interdisciplinary subject, terahertz technology has a significant impact on other sciences such as physics, chemistry, astronomy, biomedicine, materials science, environmental science, etc., and provides a basis for technological innovation, national economic development and national security. Very attractive opportunity. At the same time, the terahertz system has a wide range of applications in many fields such as semiconductor materials, high-temperature superconducting material properties research, tomographic imaging technology, label-free genet...

Claims

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Application Information

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IPC IPC(8): G02F1/00
Inventor 袁明辉黄鑫陈长英阎祖星殷越陈麟朱亦鸣
Owner UNIV OF SHANGHAI FOR SCI & TECH
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