CN107942419B - Resonance wavelength tuner and method based on symmetry-breaking multi-metal nano ring structure - Google Patents
Resonance wavelength tuner and method based on symmetry-breaking multi-metal nano ring structure Download PDFInfo
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- CN107942419B CN107942419B CN201810013922.4A CN201810013922A CN107942419B CN 107942419 B CN107942419 B CN 107942419B CN 201810013922 A CN201810013922 A CN 201810013922A CN 107942419 B CN107942419 B CN 107942419B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/008—Surface plasmon devices
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/0009—Materials therefor
- G02F1/0081—Electric or magnetic properties
Abstract
The invention discloses a resonance wavelength tuner and a resonance wavelength tuning method based on a multi-metal nano ring structure with broken symmetry, and belongs to the technical field of resonance wavelength tuning processing. The tuner comprises a medium shaft a and a medium shaft c which are rotationally connected with a medium shaft b, and a metal nano ring a, a metal nano ring b and a metal nano ring c which are symmetrically broken are respectively fixed on the medium shaft a, the medium shaft b and the medium shaft c. The structure of this application produces the surface plasmon in the broken many metal ring of symmetry, and its electromagnetic field is very sensitive to metal ring's change around axle rotation angle, and when fixing taking place relative rotation between the medium axle in the middle of the metal nanometer ring, surface plasmon resonance wavelength takes place to remove, through changing the relative axle rotation angle between the metal nanometer ring, can realize the high-efficient regulation of resonance wavelength in the transmissivity curve.
Description
Technical Field
The invention relates to a tuning device and a tuning method for surface plasmon resonance wavelength, and belongs to the technical field of resonance wavelength tuning processing.
Background
Surface plasmons are electromagnetic modes generated by the interaction of free electrons in a metal and an incident light wave. When the incident light wave frequency matches the free electron oscillation frequency, a surface plasmon resonance phenomenon occurs. When in resonance, the incident light wave and the free electrons are effectively coupled, energy and momentum are effectively exchanged, and meanwhile, the optical properties of the metal are obviously changed, for example, the transmission spectrum has obvious peak characteristics at the resonance wavelength. Research shows that the resonance wavelength is very sensitive to the shape and size of the metal, the surrounding medium environment and other factors, and can be used as a sensitive probe for detecting surface changes. Although in many metal nanostructures, resonance characteristics can be exhibited on the transmittance spectrum, if the resonance wavelength is to be adjusted, it can be achieved by changing the parameters of the metal nanomaterial itself, such as shape and size, which is very inconvenient in practical use. For the single metal ring structure, the change of the parameters can be realized only by changing the single metal nano ring material, and the actual use of designing the resonance wavelength tuning device by utilizing the surface plasmon characteristics is very inconvenient. Therefore, the tuning efficiency of the resonant wavelength tuning device designed by the single metal ring structure is low.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a resonance wavelength tuner and a method based on a multi-metal nano ring structure with broken symmetry, and the resonance wavelength tuner and the method can realize the efficient adjustment of the resonance wavelength in a transmissivity curve by changing the relative rotation angle between metal nano rings around a shaft.
The technical scheme of the invention is as follows: a resonance wavelength tuner based on a symmetrical broken multi-metal nano ring structure comprises a plurality of medium shafts which are in rotary connection and the rotary axes of the medium shafts are positioned on the same straight line, and broken metal nano rings are respectively fixed on the medium shafts.
The number of the metal nano rings and the number of the medium shafts are three, the metal nano rings and the medium shafts comprise medium shafts a and medium shafts c which are rotationally connected with the medium shafts b, and the metal nano rings a, the metal nano rings b and the metal nano rings c which are symmetrically broken are fixed on the medium shafts a, the medium shafts b and the medium shafts c respectively.
The length of the medium shaft b is 60nm, and the metal nano-ring b is fixed at the midpoint of the medium shaft b.
The thickness of the metal nano ring a, the thickness of the metal nano ring b and the thickness of the metal nano ring c are all 50nm, the inner diameter of the metal nano ring b is 100nm, and the outer diameter of the metal nano ring c is 120 nm.
The distance between the metal nano ring a and the metal nano ring b is 10nm, and the distance between the metal nano ring b and the metal nano ring c is 10 nm.
The opening angles of the metal nanorings a, b and c are 30 degrees.
The metal nanoring a, the metal nanoring b and the metal nanoring c are made of silver.
The medium shaft a, the medium shaft b and the medium shaft c are made of glass.
The tuning method of the resonance wavelength tuner based on the symmetrical and broken tri-metal nano ring structure comprises the following steps:
s1) adjusting the metal nanoring a, the metal nanoring b, and the metal nanoring c so that the corresponding three openings are located on the same line.
S2) the resonance wave to be adjusted passes through the metal nano ring a, the metal nano ring b and the metal nano ring c in sequence;
s3) rotating the metal nano-ring a and/or the metal nano-ring c to enable the center of the opening of the metal nano-ring a and/or the metal nano-ring c and the center of the opening of the metal nano-ring b to form an included angle, and measuring out the corresponding resonance wavelength;
s4) adjusting the size of the included angle according to the comparison between the measured resonance wavelength and the required resonance wavelength;
s5) measuring the adjusted resonance wavelength;
s6) repeating the steps S4 and S5 until a desired resonance wavelength is obtained.
The adjusting process of the included angle is as follows: if the measured resonance wavelength is longer than the required resonance wavelength, the angle of the included angle is adjusted to be smaller; and if the measured resonance wavelength is shorter than the required resonance wavelength, adjusting the angle of the included angle to be larger.
The invention has the beneficial effects that: the structure of this application produces the surface plasmon in the broken many metal ring of symmetry, and its electromagnetic field is very sensitive to metal ring's change around axle rotation angle, and when fixing taking place relative rotation between the medium axle in the middle of the metal nanometer ring, surface plasmon resonance wavelength takes place to remove, through changing the relative axle rotation angle between the metal nanometer ring, can realize the high-efficient regulation of resonance wavelength in the transmissivity curve.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a top view of a symmetry-broken metallic nanoring;
FIG. 3 shows the rotation angle θ around the axis of the metal nanoring c3Is 0oChanging only the pivoting angle theta of the metal nanoring a1Simulating the obtained transmittance curve graph;
FIG. 4 shows the rotation angle θ around the axis of the metal nanoring c3Is 0oChanging only the pivoting angle theta of the metal nanoring a1Then, simulating to obtain an electric field distribution diagram at the resonance wavelength;
FIG. 5 shows the simultaneous change of the rotation angle θ of the metal nanoring a around the axis1And metal nanoring cAngle of rotation about axis theta3Simulating the obtained transmissivity curve graph;
FIG. 6 is a view showing that the rotation angle θ of the metal nanoring a around the axis is changed simultaneously1And the pivoting angle theta of the metal nanoring c3The electric field distribution diagram at the resonance wavelength is obtained by simulation.
The reference numbers in the figures are as follows: 1. the device comprises a medium shaft a, 2, a medium shaft b, 3, a medium shaft c, 4, a metal nano ring a, 5, a metal nano ring b, 6 and a metal nano ring c.
Detailed Description
The invention is further described below with reference to the accompanying figures 1-6:
a resonance wavelength tuner based on a symmetrical broken multi-metal nano ring structure comprises a plurality of medium shafts which are in rotary connection and the rotary axes of the medium shafts are positioned on the same straight line, and broken metal nano rings are respectively fixed on the medium shafts.
The number of the metal nano rings and the number of the medium shafts are three, the metal nano rings and the medium shafts comprise a medium shaft a1 and a medium shaft c3 which are rotationally connected with a medium shaft b2, and the metal nano rings a4, the metal nano rings b5 and the metal nano rings c6 which are symmetrically broken are fixed on the medium shaft a1, the medium shaft b2 and the medium shaft c3 respectively.
The length of the medium shaft b2 is 60nm, and the metal nano-ring b5 is fixed at the midpoint of the medium shaft b 2.
The thicknesses of the metal nano ring a4, the metal nano ring b5 and the metal nano ring c6 are all 50nm, the inner diameter is 100nm and the outer diameter is 120 nm.
The distance between the metal nano ring a4 and the metal nano ring b5 is 10nm, and the distance between the metal nano ring b5 and the metal nano ring c6 is 10 nm.
The opening angles of the metal nano-ring a4, the metal nano-ring b5 and the metal nano-ring c6 are 30 degrees.
The metal nano ring a4, the metal nano ring b5 and the metal nano ring c6 are made of silver.
The medium shaft a1, the medium shaft b2 and the medium shaft c3 are made of glass.
The tuning method of the resonance wavelength tuner based on the symmetrical and broken tri-metal nano ring structure comprises the following steps:
s1) adjusting the metal nanoring a4, the metal nanoring b5 and the metal nanoring c6 so that the corresponding three openings are located on the same straight line.
S2) passing the resonance wave to be adjusted through the metal nano-ring a4, the metal nano-ring b5 and the metal nano-ring c6 in sequence;
s3) rotating the metal nanoring a4 and/or the metal nanoring c6 to make the center of the opening of the metal nanoring a4 and/or the metal nanoring c6 and the center of the opening of the metal nanoring b5 form an included angle, and calculating the corresponding resonance wavelength;
s4) adjusting the size of the included angle according to the comparison between the measured resonance wavelength and the required resonance wavelength;
s5) measuring the adjusted resonance wavelength;
s6) repeating the steps S4 and S5 until a desired resonance wavelength is obtained.
The adjusting process of the included angle is as follows: if the measured resonance wavelength is longer than the required resonance wavelength, the angle of the included angle is adjusted to be smaller; and if the measured resonance wavelength is shorter than the required resonance wavelength, adjusting the angle of the included angle to be larger.
Example 1
The resonance wavelength tuner based on the symmetrical broken three-metal nano ring structure has the advantages that the inner diameters D and the outer diameters D of metal nano rings are all 100nm and 120nm, the broken degrees (namely the opening angles phi) of the rings are all 30 degrees, the thicknesses of the rings are all 50nm, and the metal nano ring 2 is rotated at a rotation angle theta relative to an x axis2Is fixed at 0 deg.. The material of the nano circular ring is silver. The dielectric shaft is made of glass and is in a cylindrical shape, and the diameter of the dielectric shaft is the same as the inner diameter of the metal nano ring and is 100 nm. The length of the medium shaft b is 60nm, and the metal nano-ring b is fixed at the midpoint of the medium shaft b in the vertical direction. The distances between the metal nano-ring a and the metal nano-ring c are the same as those between the metal nano-ring b, and are both 10 nm.
As shown in fig. 3, when the metal nanoring c is fixed, the rotation angle θ around the axis is formed3Is 0 degree, only the pivoting angle theta of the metal nanoring a is changed1The tuning of the inventionIn the transmittance curve of the device, the surface plasmon resonance wavelength is varied with the rotation angle theta1May be varied. Specifically, when θ1The resonance wavelengths were 0.94 μm, 1.01 μm, 1.06 μm and 1.09 μm, respectively, at 0 °, 45 °, 60 ° and 90 °. From FIG. 3, it can be concluded that the resonance wavelength varies with the rotation angle θ1Increase in size and a red shift occurs.
Further, as shown in fig. 4, at the different rotation angles θ1At the corresponding resonance wavelengths, the electric field distribution diagram of the tuner of the present invention is given, respectively. From the results of FIG. 4, it can be seen that the angle θ varies with the rotation angle1In addition to the change in resonant wavelength, the location of the hot spot (i.e., where the electric field is greatest) in the tuner also exhibits a significant change.
Example 2
As another use method, as shown in fig. 5, the pivoting angles θ of the metal nanorings a are respectively changed1And the pivoting angle theta of the metal nanoring c3In the transmittance curve of the tuner of the present invention, the surface plasmon resonance wavelength is dependent on the rotation angle θ1And theta3While simultaneously changing and changing. In this example, the metal nanoring a and the metal nanoring c rotate around the axis at the same time, and the rotation angles are equal and the directions are opposite. Specifically, θ 10 ° and θ3＝0°，θ145 ° and θ3＝-45°，θ160 ° and θ3＝-60°，θ190 ° and θ3The resonance wavelengths were 0.94 μm, 1.07 μm, 1.14 μm and 1.18 μm, respectively, at-90 °. From FIG. 5, it can be concluded that the resonance wavelength varies with the rotation angle θ1And theta3While the change also changes.
Further, as shown in fig. 6, the angle θ is rotated at the same time1And theta3The electric field distribution diagram of the tuner of the invention is respectively given at the corresponding resonance wavelength. From the results of FIG. 6, it can be seen that the angle θ varies with the rotation angle1And theta3While changing, the hot spot location in the tuner also exhibits significant variation. Fig. 6 conclusion further illustrates that the tuner according to the invention is sensitive to the parameter of the rotation angle.
From the above embodiments, it can be seen that when relative rotation occurs between the dielectric axes fixed in the middle of the metal nanorings, the surface plasmon resonance wavelength shifts, and by changing the relative rotation angle around the axis between the metal nanorings, efficient adjustment of the resonance wavelength in the transmittance curve can be achieved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A resonance wavelength tuner based on a symmetrical broken multi-metal nano ring structure is characterized by comprising a plurality of medium shafts which are rotatably connected and the rotating axes of the medium shafts are positioned on the same straight line, and broken metal nano rings are respectively fixed on the medium shafts.
2. The resonance wavelength tuner based on the symmetry-broken multi-metal nano-ring structure as claimed in claim 1, wherein the number of the metal nano-rings and the number of the medium shafts are three, and the resonance wavelength tuner comprises a medium shaft a (1) and a medium shaft c (3) which are rotatably connected with a medium shaft b (2), and the medium shaft a (1), the medium shaft b (2) and the medium shaft c (3) are respectively fixed with the symmetry-broken metal nano-ring a (4), the metal nano-ring b (5) and the metal nano-ring c (6).
3. The resonance wavelength tuner based on the symmetry-breaking multi-metallic nano-ring structure as claimed in claim 2, wherein the length of the dielectric axis b (2) is 60nm, and the metallic nano-ring b (5) is fixed at the midpoint of the dielectric axis b (2).
4. The resonance wavelength tuner based on the symmetry-breaking multi-metallic nanoring structure of claim 2, wherein the metallic nanoring a (4), the metallic nanoring b (5) and the metallic nanoring c (6) each have a thickness of 50nm, an inner diameter of 100nm and an outer diameter of 120 nm.
5. The resonance wavelength tuner based on the symmetry-breaking multi-metallic nano-ring structure of claim 2, wherein the distance between the metallic nano-ring a (4) and the metallic nano-ring b (5) is 10nm, and the distance between the metallic nano-ring b (5) and the metallic nano-ring c (6) is 10 nm.
6. The resonance wavelength tuner based on the symmetry-broken multi-metallic nanoring structure of claim 2, wherein the broken opening angles of the metallic nanoring a (4), the metallic nanoring b (5) and the metallic nanoring c (6) are 30 °.
7. The resonance wavelength tuner based on the symmetry-breaking multi-metal nano ring structure as claimed in claim 2, wherein the metal nano ring a (4), the metal nano ring b (5) and the metal nano ring c (6) are made of silver.
8. The resonance wavelength tuner based on the symmetry-breaking multi-metal nano-ring structure as claimed in claim 2, wherein the dielectric axis a (1), the dielectric axis b (2) and the dielectric axis c (3) are made of glass.
9. The tuning method of a resonance wavelength tuner based on a symmetry-breaking multi-metallic nano-ring structure as claimed in claim 2, comprising the steps of:
s1) adjusting the metal nano-ring a (4), the metal nano-ring b (5) and the metal nano-ring c (6) to enable the corresponding three broken openings to be located on the same straight line;
s2) passing the resonance wave to be adjusted through the metal nano-ring a (4), the metal nano-ring b (5) and the metal nano-ring c (6) in sequence;
s3) rotating the metal nano-ring a (4) and/or the metal nano-ring c (6) to enable the center of the broken opening of the metal nano-ring a (4) and/or the metal nano-ring c (6) and the center of the broken opening of the metal nano-ring b (5) to form an included angle, and measuring out the corresponding resonance wavelength;
s4) adjusting the size of the included angle according to the comparison between the measured resonance wavelength and the required resonance wavelength;
s5) measuring the adjusted resonance wavelength;
s6) repeating the steps S4 and S5 until a desired resonance wavelength is obtained.
10. The tuning method of the resonance wavelength tuner based on the symmetry-breaking tri-metal nano-ring structure as claimed in claim 9, wherein the adjusting process of the included angle is as follows: if the measured resonance wavelength is longer than the required resonance wavelength, the angle of the included angle is adjusted to be smaller; and if the measured resonance wavelength is shorter than the required resonance wavelength, adjusting the angle of the included angle to be larger.
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| CN114280710B (en) * | 2021-12-19 | 2024-02-02 | 复旦大学 | Super-structured surface with bicontinuous spectrum binding state characteristics |
| CN114296165B (en) * | 2022-01-06 | 2023-10-17 | 大连大学 | Plasmon resonance wavelength tuner based on metal-broken nano double-ring structure |
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| US8054146B2 (en) * | 2005-11-14 | 2011-11-08 | Iowa State University Research Foundation, Inc. | Structures with negative index of refraction |
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| US8054146B2 (en) * | 2005-11-14 | 2011-11-08 | Iowa State University Research Foundation, Inc. | Structures with negative index of refraction |
| KR20090124531A (en) * | 2008-05-30 | 2009-12-03 | 재단법인서울대학교산학협력재단 | Broadband voltage controlled oscillator using microstrip transmission line and vlsrr |
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