CN201340905Y - Terahertz wave zone plate - Google Patents

Terahertz wave zone plate Download PDF

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Publication number
CN201340905Y
CN201340905Y CNU2009200187328U CN200920018732U CN201340905Y CN 201340905 Y CN201340905 Y CN 201340905Y CN U2009200187328 U CNU2009200187328 U CN U2009200187328U CN 200920018732 U CN200920018732 U CN 200920018732U CN 201340905 Y CN201340905 Y CN 201340905Y
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China
Prior art keywords
zone plate
thz wave
formula
shape
wave strap
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Expired - Fee Related
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CNU2009200187328U
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Chinese (zh)
Inventor
李德华
赵阳
孙清珍
刘启鑫
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Shandong University of Science and Technology
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Shandong University of Science and Technology
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Priority to CNU2009200187328U priority Critical patent/CN201340905Y/en
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Abstract

The utility model discloses a terahertz wave zone plate which has a convex-concave shape with prescribed deepness confirmed by a prescribed basic wave length according with a wave band of an incident terahertz frequency, the incident terahertz frequency is from 0.1 THz to 10 THz. The convex-concave shape has a convex shape and a sawtooth shape, the convex shape has a prescribed diameter, the centre exists on a light axis; in addition, part outside the convex shape forms a sawtooth shape, a side face of one side of each sawtooth near to the light axis is formed vertically, a side face of the other side far away from the light axis forms an inclined plane; shape configuration of the convex shape and the sawtooth shape is a concentric circle shape. Compared with an off-axis paraboloidal mirror and a hyper-hemispherical lens for terahertz focusing, the zone plate can increase diameter by no increasing thickness which is benefit for realizing equipment miniaturisation. The zone plate also has characteristics of simple structure, low loss, low weight and low cost.

Description

The THz wave strap
Technical field
The utility model relates to a kind of THz wave strap, uses electromagnetic diffraction principle to finish focusing to THz wave.
Background technology
Over past ten years,, be used for the zone plate of visible light wave range, very big progress arranged and in space optics along with the development of diffraction optics and binary optical, long-range optical communication, fields such as image recognition and image processing become important focusing and collimating element.Now, people have introduced other electromagnetic wave band outside the visible light to the application of zone plate, as X ray, and millimeter wave, microwave etc.At millimeter wave band, because the big antennas that play a part of zone plate in addition based on diffraction principle, are commonly referred to as diffraction antenna more.Characteristics such as it has in light weight, and volume is little are used widely.
Along with the covering in Terahertz space, Terahertz experiment and the research of using have had a lot of progress.At terahertz imaging, survey, in the systems such as spectrum, the focusing of THz wave and collimation are that system moves a requisite ring.If focusing of THz wave now and collimation use super hemisphere silicon lens of winner or off axis paraboloidal mirror.The thickness of hyper-hemispherical lens is greater than radius, and its thickness can increase along with the increase of diameter.The increase of lens thickness can cause the increase of absorption loss.The increase of off axis paraboloid mirror aperture of mirror, though can not cause the increase of loss, the increase of thickness is clearly, is unfavorable for the miniaturization of system.
The utility model content
The purpose of this utility model provides a kind of THz wave strap, and that this kind zone plate has is simple in structure, low-loss, low weight, characteristics cheaply.
The technical solution that the utility model adopts for achieving the above object is:
THz wave strap, this THz wave strap have according to the reference wavelength of the regulation in the wave band of incident Terahertz and the concaveconvex shape of definite prescribed depth, and described incident Terahertz frequency is from 0.1THz to 10THz.
Above-mentioned THz wave strap, the cross section that the plane of the involved optical axis of at least a portion of its concaveconvex shape is blocked has zigzag fashion;
The structural parameters of THz wave strap are defined by formula (1), formula (2):
r k = 2 kfλ + ( kλ ) 2 K=1,2 ... N formula (1)
z ( r ) = ( n - 1 ) f + ( k - 1 ) nλ - ( n - 1 ) 2 f 2 + ( n 2 - 1 ) r 2 + ( k - 1 ) 2 λ 2 - 2 ( n - 1 ) ( k - 1 ) λf n 2 - 1 + d Formula (2)
Wherein, r kBe the outward flange radius of k endless belt of zone plate, f is the focal length of zone plate, and λ is a design wavelength, and N is the maximum wavestrip number of zone plate, and z (r) is the expression formula of zone plate surface profile line, and d is the thickness of zone plate, and n is the refractive index of material; Through type (1), formula (2) just can be made the continuous mutually change type zone plate in a position according to the default focal length and the diameter of given material, incident wavelength, zone plate.
Above-mentioned THz wave strap outline is circular, and concaveconvex shape has convex shape and zigzag fashion, and convex shape has the diameter of regulation, wherein feels to be on the optical axis; In addition, the part outside convex shape forms zigzag fashion; Each zigzag fashion forms near the lateral vertical ground of a side of optical axis, apart from the one-tenth inclined plane, side of an optical axis side far away; Convex shape and zigzag fashion are configured to concentric circles.
Above-mentioned THz wave strap, the cross section that the plane of the involved optical axis of at least a portion of its concaveconvex shape is blocked have the stairstepping of p level (p is the integer more than 2);
The structural parameters of THz wave strap are defined by formula (3), formula (4):
r k = 2 kfλ / p + ( kλ / p ) 2 K=1,2 ... N formula (3)
D=λ/p (n-1) formula (4)
Wherein, r kBe the outward flange radius of k endless belt of zone plate, f is the focal length of zone plate, and λ is a design wavelength, and p is the number of steps of zone plate in each cycle, and N is the maximum wavestrip number of zone plate, and n is the refractive index of material, and d is the etching depth of a step of zone plate; Through type (3), formula (4) formula just can be according to given materials, incident wavelength, and the default focal length of zone plate and diameter are made a position phase step change type zone plate.
Above-mentioned THz wave strap becomes stairstepping and is symmetric shape with respect to optical axis, described concaveconvex shape is made of rotational symmetric stairstepping, rotational symmetric stairstepping has the diameter of regulation, wherein feels to be on the optical axis, and stairstepping is the level Four stairstepping.
Above-mentioned concaveconvex shape is to make by machine cut technology or the straight literary style of laser beam.
Above-mentioned THz wave strap is made as raw material by polystyrene, foamed polystyrene, foamed polyethylene, polyethylene, polytetrafluoroethylene or silicon.
The beneficial effects of the utility model: this kind zone plate is compared with super hemisphere silicon lens that is used for Terahertz focusing now or off axis paraboloidal mirror can increase diameter very easily, and does not need to increase thickness, helps realizing device miniaturization.In addition, zone plate also has simple in structure, low-loss, low weight, characteristics cheaply.
Description of drawings
Fig. 1 is the cross-sectional view of half zone plate;
Fig. 2 is the position cutaway view of continuous change type THz wave strap mutually;
Fig. 3 is the cutaway view of position phase step change type THz wave strap.
Below in conjunction with accompanying drawing the utility model is elaborated:
Embodiment
Embodiment 1
In conjunction with Fig. 1, THz wave strap, this THz wave strap have according to the reference wavelength of the regulation in the wave band of incident Terahertz and the concaveconvex shape of definite prescribed depth, and described incident Terahertz frequency is from 0.1THz to 10THz.
THz wave strap outline is circular, and concaveconvex shape has convex shape and zigzag fashion, and convex shape has the diameter of regulation, wherein feels being on the optical axis.In addition, the part outside convex shape forms zigzag fashion.Each zigzag fashion forms near the lateral vertical ground of a side of optical axis, apart from the camber inclined plane, side (because the less naked eyes of curvature are difficult to identification) of an optical axis side far away.Convex shape and zigzag fashion are configured to concentric circles.
The structural parameters of THz wave strap are defined by formula (1), formula (2):
r k = 2 kfλ + ( kλ ) 2 K=1,2 ... N formula (1)
z ( r ) = ( n - 1 ) f + ( k - 1 ) nλ - ( n - 1 ) 2 f 2 + ( n 2 - 1 ) r 2 + ( k - 1 ) 2 λ 2 - 2 ( n - 1 ) ( k - 1 ) λf n 2 - 1 + d Formula (2)
Wherein, r kBe the outward flange radius of k endless belt of zone plate, f is the focal length of zone plate, and λ is a design wavelength, and N is the maximum wavestrip number of zone plate, and z (r) is the expression formula of zone plate surface profile line, and d is the thickness of zone plate, and n is the refractive index of material.Through type (1), formula (2) just can promptly can determine to make every data of zone plate according to the default focal length and the diameter of given material, incident wavelength, zone plate, and this kind zone plate is the continuous mutually change type zone plate in a position.
This THz wave strap, is made by the machine cut technology as raw material by polystyrene, foamed polystyrene, foamed polyethylene, polyethylene, polytetrafluoroethylene or silicon.
Embodiment 2
In conjunction with Fig. 2, THz wave strap, this THz wave strap have according to the reference wavelength of the regulation in the wave band of incident Terahertz and the concaveconvex shape of definite prescribed depth, and described incident Terahertz frequency is from 0.1THz to 10THz.
Consider the difficulty of actual processing, the THz wave strap of taking following measure to obtain being similar to.This embodiment is processed into straight inclined plane with the arc inclined plane of mentioning among the embodiment 1, and convex shape is still determined by formula (2).This kind zone plate outline is circular, and concaveconvex shape has convex shape and zigzag fashion, and convex shape has the diameter of regulation, wherein feels being on the optical axis.In addition, the part outside convex shape forms zigzag fashion.Each zigzag fashion forms near the lateral vertical ground of a side of optical axis, apart from the one-tenth inclined plane, side of an optical axis side far away.Convex shape and zigzag fashion are configured to concentric circles.This kind zone plate is the continuous mutually change type zone plate in a position.
This THz wave strap, is made by the machine cut technology as raw material by polystyrene, foamed polystyrene, foamed polyethylene, polyethylene, polytetrafluoroethylene or silicon.
Embodiment 3
In conjunction with Fig. 3, THz wave strap, this THz wave strap have according to the reference wavelength of the regulation in the wave band of incident Terahertz and the concaveconvex shape of definite prescribed depth, and described incident Terahertz frequency is from 0.1THz to 10THz.
The concaveconvex shape of this THz wave strap becomes stairstepping, realizes as convex shape among the embodiment 1 and zigzag fashion by the stairstepping of one group of group is approximate.Zone plate is the shape of symmetry with respect to optical axis.The concaveconvex shape of zone plate is made of rotational symmetric stairstepping, and rotational symmetric stairstepping has the diameter of regulation, wherein feels being on the optical axis, and stairstepping is the level Four stairstepping.
The structural parameters of THz wave strap are defined by formula (3), formula (4):
r k = 2 kfλ / p + ( kλ / p ) 2 K=1,2 ... N formula (3)
D=λ/p (n-1) formula (4)
Wherein, r kBe the outward flange radius of k endless belt of zone plate, f is the focal length of zone plate, and λ is a design wavelength, the number of steps of zone plate in each cycle of p, and N is the maximum wavestrip number of zone plate, and n is the refractive index of material, and d is the etching depth of a step of zone plate; Through type (3), formula (4) formula just can be according to given materials, incident wavelength, and the default focal length of zone plate and diameter are finished a position phase step change type zone plate.
This THz wave strap, is made by the straight literary style of laser beam as raw material by polystyrene, foamed polystyrene, foamed polyethylene, polyethylene, polytetrafluoroethylene or silicon.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.

Claims (7)

1, THz wave strap is characterized in that: described THz wave strap has according to the reference wavelength of the regulation in the wave band of incident Terahertz and the concaveconvex shape of definite prescribed depth, and described incident Terahertz frequency is from 0.1THz to 10THz.
2, THz wave strap according to claim 1 is characterized in that: described THz wave strap, and the cross section that the plane of the involved optical axis of at least a portion of its concaveconvex shape is blocked has zigzag fashion;
The structural parameters of THz wave strap are defined by formula (1), formula (2):
r k = 2 kfλ + ( kλ ) 2 K=1,2 ... N formula (1)
z ( r ) = ( n - 1 ) f + ( k - 1 ) nλ - ( n - 1 ) 2 f 2 + ( n 2 - 1 ) r 2 + ( k - 1 ) 2 λ 2 - 2 ( n - 1 ) ( k - 1 ) λf n 2 - 1 + d Formula (2)
Wherein, r kBe the outward flange radius of k endless belt of zone plate, f is the focal length of zone plate, and λ is a design wavelength, and N is the maximum wavestrip number of zone plate, and z (r) is the expression formula of zone plate surface profile line, and d is the thickness of zone plate, and n is the refractive index of material; Through type (1), formula (2) just can be made the continuous mutually change type zone plate in a position according to the default focal length and the diameter of given material, incident wavelength, zone plate.
3, THz wave strap according to claim 1 is characterized in that: described THz wave strap outline is circular, and concaveconvex shape has convex shape and zigzag fashion, and convex shape has the diameter of regulation, wherein feels to be on the optical axis; In addition, the part outside convex shape forms zigzag fashion; Each zigzag fashion forms near the lateral vertical ground of a side of optical axis, apart from the one-tenth inclined plane, side of an optical axis side far away; Convex shape and zigzag fashion are configured to concentric circles.
4, THz wave strap according to claim 1 is characterized in that: described THz wave strap, the cross section that the plane of the involved optical axis of at least a portion of its concaveconvex shape is blocked have the stairstepping of p level (p is the integer more than 2);
The structural parameters of THz wave strap are defined by formula (3), formula (4):
r k = 2 kfλ / p + ( kλ / p ) 2 K=1,2 ... N formula (3)
D=λ/p (n-1) formula (4)
Wherein, r kBe the outward flange radius of k endless belt of zone plate, f is the focal length of zone plate, and λ is a design wavelength, and p is the number of steps of zone plate in each cycle, and N is the maximum wavestrip number of zone plate, and n is the refractive index of material, and d is the etching depth of a step of zone plate; Through type (3), formula (4) formula just can be according to given materials, incident wavelength, and the default focal length of zone plate and diameter are made a position phase step change type zone plate.
5, THz wave strap according to claim 4, it is characterized in that: described THz wave strap becomes stairstepping and is symmetric shape with respect to optical axis, described concaveconvex shape is made of rotational symmetric stairstepping, rotational symmetric stairstepping has the diameter of regulation, wherein feel being on the optical axis, stairstepping is the level Four stairstepping.
6, according to claim 3,4 or 5 described THz wave straps, it is characterized in that: described concaveconvex shape is to make by machine cut technology or the straight literary style of laser beam.
7, THz wave strap according to claim 6 is characterized in that: described THz wave strap, make as raw material by polystyrene, foamed polystyrene, foamed polyethylene, polyethylene, polytetrafluoroethylene or silicon.
CNU2009200187328U 2009-01-22 2009-01-22 Terahertz wave zone plate Expired - Fee Related CN201340905Y (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102272578A (en) * 2009-01-05 2011-12-07 佳能株式会社 Terahertz examining apparatus
CN102903986A (en) * 2012-10-09 2013-01-30 中国计量学院 Trapezoidal tooth shaped terahertz wave filter
CN103576228A (en) * 2013-11-14 2014-02-12 上海理工大学 Non-periodic surface plasma grating type terahertz filter
CN104849780A (en) * 2015-05-29 2015-08-19 中国工程物理研究院激光聚变研究中心 Terahertz-wave optical lens and terahertz-wave system
CN105353532A (en) * 2015-10-08 2016-02-24 上海理工大学 Method for adjusting absolute phases in multi-octave terahertz light source
CN106323981A (en) * 2015-06-23 2017-01-11 南京理工大学 Off-axis phase waveband plate-based interference microscopic detection apparatus
CN112271011A (en) * 2020-10-23 2021-01-26 山东科技大学 Packaging method and system of X-ray zone plate
US20210194144A1 (en) * 2019-12-20 2021-06-24 Hamamatsu Photonics K.K. Terahertz wave lens and method for producing terahertz wave lens
CN114408912A (en) * 2021-12-30 2022-04-29 电子科技大学 Preparation method of low-reflection graphene deflection type terahertz wave zone plate

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102272578B (en) * 2009-01-05 2013-08-14 佳能株式会社 Terahertz examining apparatus
CN102272578A (en) * 2009-01-05 2011-12-07 佳能株式会社 Terahertz examining apparatus
CN102903986B (en) * 2012-10-09 2014-11-12 中国计量学院 Trapezoidal tooth shaped terahertz wave filter
CN102903986A (en) * 2012-10-09 2013-01-30 中国计量学院 Trapezoidal tooth shaped terahertz wave filter
CN103576228B (en) * 2013-11-14 2016-02-10 上海理工大学 Non-periodic surface plasma grating type terahertz filter
CN103576228A (en) * 2013-11-14 2014-02-12 上海理工大学 Non-periodic surface plasma grating type terahertz filter
CN104849780A (en) * 2015-05-29 2015-08-19 中国工程物理研究院激光聚变研究中心 Terahertz-wave optical lens and terahertz-wave system
CN106323981A (en) * 2015-06-23 2017-01-11 南京理工大学 Off-axis phase waveband plate-based interference microscopic detection apparatus
CN105353532A (en) * 2015-10-08 2016-02-24 上海理工大学 Method for adjusting absolute phases in multi-octave terahertz light source
CN105353532B (en) * 2015-10-08 2018-06-29 上海理工大学 A kind of regulation and control method of absolute phase in multi-octave Terahertz light source
US20210194144A1 (en) * 2019-12-20 2021-06-24 Hamamatsu Photonics K.K. Terahertz wave lens and method for producing terahertz wave lens
CN112271011A (en) * 2020-10-23 2021-01-26 山东科技大学 Packaging method and system of X-ray zone plate
CN114408912A (en) * 2021-12-30 2022-04-29 电子科技大学 Preparation method of low-reflection graphene deflection type terahertz wave zone plate

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Granted publication date: 20091104

Termination date: 20120122