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A Helical Resonator for Generating Localized Orbital Angular Momentum

An orbital angular momentum and helix technology, applied in resonators, waveguide devices, circuits, etc., can solve the problem of not guaranteeing the angular momentum of electromagnetic waves, and achieve the effect of enhancing chiral asymmetry and reducing radiation loss.

Active Publication Date: 2021-03-19
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although structures such as spirals and swastikas have chiral asymmetry, simply adopting these structures does not guarantee the effect of generating electromagnetic wave angular momentum

Method used

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  • A Helical Resonator for Generating Localized Orbital Angular Momentum
  • A Helical Resonator for Generating Localized Orbital Angular Momentum
  • A Helical Resonator for Generating Localized Orbital Angular Momentum

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The gap in the helical resonator of this embodiment 1 =gap 2 =0, namely the first metal helical wire structure and the second complementary helical wire structure have the same large circle radius and small circle radius, R 1 =R 2 = 10mm, r 1 = r 2 = 1.5mm, the width s of the inner and outer circles 1 =s 2 =0.2mm, the width of the metal helix and the width of the complementary helix are both 0.2mm, and its structure is as follows image 3 - Shown in (a). In this embodiment, the resonator adopts a symmetrical microstrip slot coupling excitation mode, and the gap between the end face of the microstrip line and the resonator is 0.2 mm. S in this case 11 spectral lines such as image 3 -shown in (b). Because the coupling efficiency of this excitation method is low, and it is symmetrical excitation. Depend on image 3 -The amplitude and phase of the z component of the electric field in (c) (the z direction is the direction perpendicular to the paper surface), the...

Embodiment 2

[0041] The coupling efficiency in the first embodiment is low, and the excitation structure is a symmetrical structure, and the helical phase plane of the orbital angular momentum is not uniform. In order to improve the uniformity of the helical phase plane, it is necessary to further increase the chiral asymmetry of the resonator, or use an asymmetric excitation method. This embodiment adopts an asymmetric excitation method to further enhance the chiral asymmetry of the entire structure, improve excitation efficiency, and realize a uniform spiral phase plane and high-order orbital angular momentum.

[0042] The structure of the resonator used in this embodiment is the same as that of Embodiment 1, and the excitation structure is as follows Figure 4 As shown in -(a), a 120° microstrip arc is used for excitation. The microstrip arc excitation includes a straight line part and an arc line part; the end of the straight line part is connected to the arc line part. In order to ens...

Embodiment 3

[0044] The difference between this embodiment and Embodiment 2 is that in this embodiment, a 180° microstrip arc is used for excitation. In the microstrip arc excitation, the connection point between the end of the straight line and the arc part divides the arc into two parts of 120° and 60°. The structure is as follows Figure 5 - Shown in (a). S 11 spectral lines such as Figure 5 - As shown in (b), the amplitude and phase of the z component of the electric field are as Figure 5 -(c) (z is the direction perpendicular to the paper surface), electric dipoles, electric quadrupoles, and electric hexapoles correspond to orbital angular momentums of l=1, 2, and 3, respectively. The modes and field constraints of its electric dipole (l=1), electric quadrupole (l=2), electric hexapole (l=3) are all basically the same as embodiment two, but the excitation efficiency of l=1 The increase is 80%, and the excitation efficiency of l=2 and l=3 is almost unchanged.

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Abstract

The invention discloses a spiral line resonator capable of generating a local orbital angular momentum. The spiral line resonator comprises a first resonance pattern layer, a second resonance patternlayer and a dielectric substrate layer located between the first resonance pattern layer and the second resonance pattern layer. The first resonance pattern layer comprises an outer side metal circleand a first metal spiral line structure; the first metal spiral line structure comprises a plurality of uniformly distributed metal spiral lines, one end of each metal spiral line is connected with the outer side metal ring, and the other end is concyclic; the second resonance pattern layer comprises an inner side circle and a second complementary spiral line structure which are complementary on large-area metal ground; the second complementary spiral line structure comprises a plurality of complementary spiral lines which are uniformly distributed, one end of each complementary spiral line isconnected with the inner side circle, and the other end is concyclic; and projections of the first metal spiral line structure and the second complementary spiral line structure along a normal direction of the surface of the resonator do not superpose or incompletely superpose. According to the resonator, chirality asymmetry of the structure is enhanced through rotation of the upper and lower layers of spiral lines, and a local orbital angular momentum resonator is realized at a sub-wavelength scale.

Description

technical field [0001] The invention belongs to the technical field of resonators and microwave circuits, and specifically relates to a resonator that breaks chiral symmetry and can localize the electromagnetic wave spiral phase plane, that is, the orbital angular momentum mode, on a sub-wavelength scale. Background technique [0002] The angular momentum carried by electromagnetic waves includes spin angular momentum (Spin angular momentum, SAM) and orbital angular momentum (Orbital angular momentum, OAM). Orbital angular momentum is generated by the rotation of the phase plane around the optical axis. The wavefront of electromagnetic waves is no longer a plane, but rotates around the direction of propagation, showing a helical wavefront. Compared with spin angular momentum (circular polarization), which has been widely studied and applied, the concept of orbital angular momentum of electromagnetic waves was only proposed in 1989, and it has received more and more attentio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P7/00
CPCH01P7/005
Inventor 张璇如崔铁军
Owner SOUTHEAST UNIV
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