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Fresnel prism and method for converting polarization state of terahertz wave

A Fresnel prism and terahertz technology, applied in the direction of prisms, polarizing elements, etc., can solve problems such as inability to switch, and achieve the effect of preventing direction change

Inactive Publication Date: 2012-07-18
CAPITAL NORMAL UNIVERSITY
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Problems solved by technology

It can be seen that the existing technology is only suitable for the transformation of the polarization state of a single frequency terahertz wave, but for polychromatic linearly polarized terahertz waves containing multiple frequency components (such as linearly polarized single-cycle pulsed terahertz waves), this method is It is impossible to simultaneously convert the polarization states of terahertz waves of all frequencies into circular polarization states

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  • Fresnel prism and method for converting polarization state of terahertz wave
  • Fresnel prism and method for converting polarization state of terahertz wave
  • Fresnel prism and method for converting polarization state of terahertz wave

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Embodiment Construction

[0026] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0027] figure 1 , figure 2 and image 3 They are respectively the structural diagram, side view and top view of the Fresnel prism proposed by the present invention. A prism is an object surrounded by two intersecting planes, and a Fresnel prism is a kind of prism. In a Fresnel prism, the planes for light incident and exit are called the sides of the Fresnel prism.

[0028] Such as Figure 1-3 As shown, the Fresnel prism is a bar-shaped column, which is made of a material that does not produce a dispersion effect on the terahertz wave, and prevents the outgoing terahertz wave from changing direction due to the dispersion of the terahertz wave inside it. The Fresnel prism The preferred embodiment of the manufact...

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Abstract

The invention relates to a Fresnel prism and a method for converting a polarization state of a terahertz wave. The Fresnel prism is in a bar-type columnar shape and is made of a material which can not generate a dispersion effect on the terahertz wave. The Fresnel prism comprises four arris and two side surfaces which are opposite and parallel to each other. The two side surfaces are squares with same side lengths. Each arris is perpendicular to one edge of the each side surface. An included angle alpha of the each arris and the each side surface satisfies a formula (1), wherein n is a refractive index of the making material of the Fresnel prism to the terahertz wave. A length of the each arris satisfies that the terahertz wave of incident linear polarization which is perpendicular to one side surface can emit from another side surface after generating even numbers of total reflections in the Fresnel prism. According to the invention, the polarization states of the multi-color linear polarization terahertz waves can be converted into circular polarization simultaneously.

Description

technical field [0001] The invention relates to the technical field of polarization state conversion of terahertz waves, in particular to a Fresnel prism and a method for converting the polarization state of terahertz waves using the Fresnel prism. Background technique [0002] Terahertz waves have unique properties such as transient, low energy, and coherence, and have great scientific value and broad application prospects in satellite communications, nondestructive testing, and military radar. The terahertz wave whose polarization state is circular polarization is more widely used, especially it provides a special light source for the study of the internal structure of biological macromolecules with a helical structure, and it can also be used for anisotropic materials ( Such as birefringent crystals, biological tissues with fiber orientation, etc.) for polarization-related terahertz wave ultra-broadband spectral research and structural identification. It can be seen that...

Claims

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Application Information

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IPC IPC(8): G02B5/04G02B5/30
Inventor 张亮亮祝德充邓朝张存林
Owner CAPITAL NORMAL UNIVERSITY
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