CN211263831U - Multi-resonance plasmon device based on coupling of graphene and magnetic resonance mode - Google Patents
Multi-resonance plasmon device based on coupling of graphene and magnetic resonance mode Download PDFInfo
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- CN211263831U CN211263831U CN202020120224.7U CN202020120224U CN211263831U CN 211263831 U CN211263831 U CN 211263831U CN 202020120224 U CN202020120224 U CN 202020120224U CN 211263831 U CN211263831 U CN 211263831U
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Abstract
The utility model discloses a many resonance plasmon device based on graphite alkene and magnetic resonance mode coupling belongs to optoelectronics and nanometer photonics field, is a novel plasmon device that can use at terahertz to well far infrared wave band now. The plasmon device has the advantages of ultrathin and ultra-compact space thickness size, ultra-strong optical field local capability, ultra-high wavelength compression ratio, ultra-sensitive Fermi-level adjustable spectrum frequency shift spectral line and strong spectrum regulation and control capability. The utility model provides a research graphite alkene metal cavity mode and magnetic plasmon resonance mode's coupling, the platform of exploring light field local characteristics can be applied to many photon nonlinear optics nanometer device, photon chip or ultra-compact photon integrated optical path, super-resolution and surface enhancement raman spectroscopy, optical frequency comb optical modulator, many bandwidth multi-mode optical sensor and detector etc..
Description
Technical Field
The utility model belongs to the technical field of nanometer photonics and photoelectron, specifically be based on many resonance plasmons device of graphite alkene and magnetic resonance mode coupling.
Background
The surface plasmon has sub-wavelength space local capacity, is sensitive to the change of surrounding media, and can realize label-free, high-sensitivity, real-time detection, no-damage and non-contact detection and sensing. Most of the traditional surface plasmon materials are precious metals such as gold and silver. In recent years, graphene has attracted more and more attention as a novel surface plasmon material in mid-far infrared and terahertz wave bands. The graphene surface plasmon has relatively low loss and extremely high spatial light field local capacity. Meanwhile, the concentration and Fermi level of carriers of the graphene can be changed by adding a grid piezoelectric doping or chemical doping mode, and the surface plasmon characteristics of the graphene can be further changed. The unique adjustable characteristic has important significance for the development of novel middle and far infrared and terahertz devices.
Because the plasmon mode has a larger wave vector of the optical field and has larger momentum mismatch with the wave vector of the free space excitation light, the plasmon mode can be effectively excited still with a challenge, especially for graphene surface plasmons. The coupling between the plasmon mode and the free light is realized mainly through prism coupling, grating coupling (pages 7806 and 7813 of volume 6 of ACSNano. 2012), cavity coupling (pages 1611 and 1618 of volume 11 of ACS Phototon. 2015), near-field coupling and the like. The grating coupling can realize high-efficiency coupling at the time of vertical incidence, and is an effective coupling mode widely adopted.
A surface plasmon perfect absorber is an important optical device. The device utilizes the phenomenon of light absorption or capture caused by plasmon resonance and the like, can realize complete absorption of incident light at specific resonance wavelength, and plays a role in regulating spectral lines. Conventional perfect absorbers operate mostly in a single band or wavelength region. For many applications such as spectral analysis and nonlinear optics, the generation of multiple resonances is of great importance [ Chen, Kai, Ronen Adato, and HaticieAltuf. "Dual-band transistor absorber for multiplex plasma-enhanced in resonance, Acs Nano 6: 7998-. To form new multi-resonant modes, it is often necessary to integrate absorbing structures of different sizes [ Xianliang Liu et al, "terminating the blackberry with additional materials as selective thermal elements," phys. rev. lett.107(4),045901(2011) ], or to exploit the coupling between the different modes.
The utility model designs a novel perfect absorber structure of integrated surface plasmon of graphite alkene, adopted the grating to compensate the method of momentum mismatch, with the help of the coupling of the magnetic plasmon resonance mode of the perfect absorber of metal and graphite alkene chamber mode, arouse a new hybridization mode, produce a series of resonances in the resonance range of well far infrared wave band. The utility model discloses the light field space local of well mode can retrain 1nm to 10 nm's yardstick, and the wavelength compression ratio can realize the 1/1000 of excitation wavelength, possesses the compression local characteristic who breaks through diffraction limit, superstrong light field space local and spectrum. Furthermore, the utility model discloses a device uses magnetic plasmon resonance structure and possesses ultra-thin characteristic, and the size of vertical direction can reduce to below 100 nm. This is much smaller than the graphene integrated perfect absorber structure designed by the F-p resonance principle to excite this mode, as adopted by Lee et al, Nature Nanotechnology, volume 14, 313-. And finally, perfect absorption and spectrum line regulation can be realized by adjusting the grating structure parameters, the thickness of the dielectric layer and the Fermi level of the graphene. The utility model discloses can be used to many photon nonlinear optics nanometer device, photon chip or the super compact photon light integrated circuit, super-resolution and surface enhancement raman spectroscopy, optical frequency comb optical modulator, many bandwidth multi-mode optical sensor and detector etc..
SUMMERY OF THE UTILITY MODEL
In order to solve above technical problem, including realizing ultra-thin ultra-compact space dimension nanometer device, super local light field mode, great wavelength compression ratio, near stronger regulation and control spectral line intensity in specific wavelength possesses excellent regulation and control sensitivity simultaneously the utility model discloses a technical scheme as follows:
the multi-resonance plasmon device based on coupling of graphene and a magnetic resonance mode is characterized in that the nano device is composed of a gold film grating, a wrapped optical medium layer, single-layer or multi-layer graphene and a gold film substrate which are uniformly distributed from top to bottom; the optical medium layer wraps two sides of the single-layer or multi-layer graphene, the uniformly distributed gold thin film grating and the optical medium layer are in direct physical contact, and the gold thin film substrate is used as a reflector and is in direct physical contact with the optical medium layer.
The working waveband range of the external environment of the multi-resonance plasmon device is 5-20 microns.
The gold film grating is formed by parallelly arranging gold nanowires with the same thickness, width and length, and can be a one-dimensional grating or a two-dimensional grating.
The structural size of the gold thin-film grating is smaller than the wavelength of light waves in a working waveband; the period range of the gold thin-film grating is 200-10000 nm; the length range of the gold thin-film grating nanowire is more than 50nm, the width range is 50 nm-10000 nm, and the thickness range is 10 nm-300 nm; the slit distance between two gold nanowires of the gold film grating ranges from 3nm to 1000 nm.
The thickness range of the two optical medium layers between the gold film grating and the gold film substrate is 0.3 nm-500 nm.
The Fermi level range of the graphene is 0-1.2 eV.
The thickness of the gold film substrate is more than 20 nm.
Preferably, the period of the gold film grating is 1710nm, a one-dimensional grating with infinite length of gold nanowires is adopted, the width of the gold nanowires is 1690nm, the distance between adjacent gold nanowires is 20nm, and the thickness of the gold nanowires is 30 nm; the optical medium layers between the metal film grating and the metal film substrate and wrapping the two sides of the graphene are CaF2Refractive index of 1.4, upper CaF2And lower CaF2The thickness of the film is 30nm, the thickness of the gold film substrate is 30nm, and the Fermi level of the single-layer graphene is set to be 0.64 eV.
Preferably, the period of the gold thin film grating is 1710nm, a one-dimensional grating with infinite length of gold nanowires is adopted, the width of the gold nanowires is 1680nm, the distance between every two adjacent gold nanowires is 30nm, and the thickness of the gold nanowires is 30 nm; the optical medium layers between the metal film grating and the metal film substrate and wrapping the two sides of the graphene are CaF2Refractive index of 1.4, upper CaF2And lower CaF2The thickness of the film is 15nm, the thickness of the gold film substrate is 30nm, and the Fermi level of the single-layer graphene is set to be 0.34-0.64 eV.
The technical effects of the utility model reside in that:
1. the utility model overcomes traditional thickness that arouses graphite alkene chamber plasmon mode device is not enough and the defect, and thickness can retrain to 100nm below even thinner, realizes super compact super local light field mode nanometer device structure.
2. The optical field spatial locality can be constrained to the nanometer to 10nm scale, and wavelength compression can achieve 1/1000 even larger excitation wavelengths.
3. The intensity ratio of the spectral line of the regulation spectrum can reach 300%, and meanwhile, the regulation sensitivity is high.
Drawings
FIG. 1 is a schematic diagram of a three-dimensional structure of a multi-resonance plasmon device based on graphene and magnetic resonance mode coupling;
fig. 2 is a schematic diagram of a graphene-based magnetic resonance mode-coupled multi-resonance plasmon device in embodiment 1 without graphene absorption spectrum and reflection spectrum;
fig. 3 is a schematic diagram of an absorption spectrum and a reflection spectrum of a multi-resonance plasmon device based on coupling of graphene and a magnetic resonance mode in embodiment 1;
fig. 4 is a schematic diagram of the distribution characteristics of the multi-resonance plasmon device based on graphene coupled with a magnetic resonance mode in an electric field mode with a wavelength λ of 8.965 μm in embodiment 1;
fig. 5 is a schematic diagram of the distribution characteristics of the multi-resonance plasmon device based on graphene coupled with a magnetic resonance mode in an electric field mode with a wavelength λ of 7.085 μm in embodiment 1;
fig. 6 is a schematic diagram of electric field component mode distribution characteristics of a multi-resonance plasmon device based on graphene and magnetic resonance mode coupling in embodiment 1;
fig. 7 is a schematic diagram of tunable fermi level frequency shift characteristics of a spectral line of a multi-resonance plasmon device based on coupling of graphene and a magnetic resonance mode in embodiment 2.
The reference numbers illustrate:
1, an optical medium layer 3 wrapped by uniformly distributed metal film gratings 2, and a single-layer or multi-layer graphene 4 metal film substrate which is tiled.
Detailed Description
The invention will be explained and explained in further detail with reference to the drawings. The following figures are merely schematic illustrations of idealized embodiments of the present invention, wherein the physical structure of the devices of the present invention is not to be understood as a schematic illustration of the geometric relationships in scale, which should be strictly reflected. Of course, the embodiments of the present invention should not be construed as limited to the particular shapes of regions illustrated in the drawings. In short, the drawings are schematic and should not be considered as limiting the scope of the invention.
The multi-resonance plasmon device based on coupling of graphene and a magnetic resonance mode is characterized in that the nano device is composed of a gold film grating, a wrapped optical medium layer, single-layer or multi-layer graphene and a gold film substrate which are uniformly distributed from top to bottom; the optical medium layer wraps two sides of the single-layer or multi-layer graphene, the uniformly distributed gold thin film grating and the optical medium layer are in direct physical contact, and the gold thin film substrate is used as a reflector and is in direct physical contact with the optical medium layer.
The working waveband range of the external environment of the multi-resonance plasmon device is 5-20 microns.
The gold film grating is formed by parallelly arranging gold nanowires with the same thickness, width and length, and can be a one-dimensional grating or a two-dimensional grating.
The structural size of the gold thin-film grating is smaller than the wavelength of light waves in a working waveband; the period range of the gold thin-film grating is 200-10000 nm; the length range of the gold thin-film grating nanowire is more than 50nm, the width range is 50 nm-10000 nm, and the thickness range is 10 nm-300 nm; the slit distance between two gold nanowires of the gold film grating ranges from 3nm to 1000 nm.
The thickness range of the two optical medium layers between the gold film grating and the gold film substrate is 0.3 nm-500 nm.
The Fermi level range of the graphene is 0-1.2 eV.
The thickness of the gold film substrate is more than 20 nm.
Preferably, the period of the gold film grating is 1710nm, a one-dimensional grating with infinite length of gold nanowires is adopted, the width of the gold nanowires is 1690nm, the distance between adjacent gold nanowires is 20nm, and the thickness of the gold nanowires is 30 nm; the optical medium layers between the metal film grating and the metal film substrate and wrapping the two sides of the graphene are CaF2Refractive index of 1.4, upper CaF2And lower CaF2The thickness of the film is 30nm, the thickness of the gold film substrate is 30nm, and the Fermi level of the single-layer graphene is set to be 0.64 eV.
Preferably, the period of the gold thin film grating is 1710nm, a one-dimensional grating with infinite length of gold nanowires is adopted, the width of the gold nanowires is 1680nm, the distance between every two adjacent gold nanowires is 30nm, and the thickness of the gold nanowires is 30 nm; the optical medium layers between the metal film grating and the metal film substrate and wrapping the two sides of the graphene are CaF2Refractive index of 1.4, upper layerCaF2And lower CaF2The thickness of the film is 15nm, the thickness of the gold film substrate is 30nm, and the Fermi level of the single-layer graphene is set to be 0.34-0.64 eV.
The technical solution of the present invention is described in detail below with reference to several preferred embodiments and the accompanying drawings:
fig. 1 is a schematic diagram of a three-dimensional structure of a multi-resonance plasmon device based on graphene and magnetic resonance mode coupling, wherein a nano device is composed of a gold thin film grating, a wrapped optical medium layer, single-layer or multi-layer graphene and a gold thin film substrate which are uniformly distributed from top to bottom; the gold film grating is a one-dimensional grating or a two-dimensional grating formed by parallelly arranging gold nanowires with the same thickness, width and length; the thickness of the gold nano-wire is h0The widths are w, P is the period length of the gold film grating, P is smaller than the wavelength of the light wave in the working waveband, d is the slit distance between the gold nanowires, s0Is the thickness of the optical medium layer wrapping the graphene or the distance from the gold film grating to the gold film substrate H0Is the thickness of the substrate.
In embodiment 1, the period P of the gold thin-film grating is 1710nm, a one-dimensional grating with infinite length of gold nanowire is adopted, the width w of the gold nanowire is 1690nm, the slit distance d between two gold nanowires of the gold thin-film grating is 20nm, and the thickness h is030nm, optical medium layer CaF between gold film grating and gold film substrate2Thickness s of two layers of optical medium layer between gold film grating and gold film substrate060nm, upper CaF2Material and underlying CaF2The thickness of the material is the same, the thickness is 30nm, and the thickness H of the substrate030nm, tiled single layer graphene fermi level range EF＝0.64eV。
In embodiment 2, the period P of the gold thin film grating is 1710nm, a one-dimensional grating with infinite length of gold nanowire is adopted, the width w of the gold nanowire is 1680nm, the slit distance d between two gold nanowires of the gold thin film grating is 30nm, and the thickness h is030nm, optical medium layer CaF between gold film grating and gold film substrate2Gold thin film gratings andthickness s of two layers of optical media between gold thin film substrates030nm, upper CaF2Material and underlying CaF2The thickness of the material is the same, the thickness is 15nm, and the thickness H of the substrate030nm, tiled single layer graphene fermi level range EF＝0.34～0.64eV。
The polarization direction of the electric field is parallel to the length direction of the grating gold nanowire, and the incident direction is vertical to the plane of the device. The broad spectrum plane wave irradiates on the sensor, part of light is reflected, transmitted and absorbed, and the wavelength, the reflectivity and the transmittance can be measured by using a spectrometer so as to calculate the absorptivity.
Fig. 2 is a schematic diagram of the multi-resonance plasmon device based on coupling of graphene and magnetic resonance mode in embodiment 1 of the present invention, which does not contain graphene absorption spectrum and reflection spectrum, and generates a resonance peak near a wavelength of 8 μm corresponding to the maximum value of the absorption spectrum and the minimum value of the reflection spectrum. The position and intensity of the resonance peak are determined by the structural parameters of the grating and the thickness of the dielectric layer between the gold thin film grating and the gold thin film substrate. The resonance peak of the magnetic plasmon can be made to fall just around 8 μm by adjusting the above-mentioned structural parameters.
Fig. 3 is the utility model discloses a many resonance plasmon device based on graphite alkene and magnetic resonance mode coupling in embodiment 1 contains graphite alkene absorption spectrum and reflection spectrum sketch map, can arouse graphite alkene plasmon resonance on adding the original magnetic plasmon resonance peak after graphite alkene to play the effect of regulation and control to magnetic plasmon resonance, explain it as magnetic plasmon resonance mode and metal-medium-graphite alkene-medium-coupling between the cavity mode that the metal formed and form. Considering from another aspect, the grating acts to provide momentum or wavevector matching to the coupling action of the spatial free light and the plasmonic mode, providing a wavevector exactly equal in magnitude to the plasmonic wavevector at normal incidence. Compared with fig. 2, the regulation and control ratio of the graphene plasmon mode excited near the graphene cavity resonance peak to the spectrum can reach more than 300%.
FIG. 4 shows the coupling of graphene-based magnetic resonance modes in embodiment 1The distribution characteristic diagram of the multi-resonance plasmon device at the wavelength lambda of 8.965 mu m electric field mode is shown. Firstly, in a distribution mode characteristic diagram of an electric field mode, a strong spatial local mode can be excited around graphene between a gold thin film grating and a gold thin film substrate. The number of the local fields in the electric field mode diagram under a single period is 2 m-16, m-8 represents the order of the excited new mode, and the length of a single local field represents the half lambda of the wavelength of the plasmonspp/2. So that the plasmon wavelength λsppP/m equals approximately 210 nm. Meaning that the spatial longitudinal mode is compressed into a 60nm cavity, the mode effective index achieves lambda0/λspp≈43。
Fig. 5 is a schematic diagram of the distribution characteristics of the electric field mode of the multi-resonance plasmon device based on graphene coupled with the magnetic resonance mode in the embodiment 1 at a wavelength λ of 7.085 μm. Firstly, in a distribution mode characteristic diagram of an electric field mode, a strong spatial local mode can be excited around graphene between a gold thin film grating and a gold thin film substrate. The number of the local fields in the diagram of the electric field mode under the single period is 2 m-22, m-11 represents the order of the excited new mode, and the length of the single local field represents the half lambda of the wavelength of the plasmonspp/2. So that the plasmon wavelength λsppP/m equals to about 150 nm. Meaning that the spatial longitudinal mode is compressed into a 60nm cavity, the mode effective index achieves lambda0/λsppAnd ≈ 47. The distance between the gold film grating and the gold film substrate or the thickness of the optical medium layer is reduced, the mode effective refractive index can be effectively improved, for example, the optical medium material is selected to be a two-dimensional material such as BN, a plasmon optical field space mode can be localized to the thickness scale of an atomic layer, and the localization capability and the wavelength compression ratio of the plasmon optical field space mode are larger.
Fig. 6 is a schematic diagram of electric field component mode distribution characteristics of a multi-resonance plasmon device based on graphene and magnetic resonance mode coupling in embodiment 1, and an acoustic plasmon mode electric field component generated by coupling between a magnetic resonance mode and a cavity mode formed by metal-dielectric-graphene has a symmetric distribution and an anti-symmetric distribution.
FIG. 7 is a graph based on the following example 2The characteristic diagram of the adjustable Fermi level frequency shift and the regulation capability of the multi-resonance plasmon device spectral line coupled by the graphene and the magnetic resonance mode changes the Fermi level of the graphene, actually changes the mode effective refractive index, and changes the mode effective refractive index according to neffp＝mλ0When m is 0, 1, 2 …, the position of the graphene cavity plasmon mode or the excitation wavelength λ can be obtained0Movement may also occur. As shown in the figure, the Fermi level of the graphene is shown to be EFAbsorption lines for nanodevices at 0eV, 0.54eV, and 0.64 eV. The Fermi level of the graphene is improved, the position of the same level is determined through an electric field mode distribution diagram, and the situation that the Fermi level of the graphene is reduced by 0.1eV is found, so that the same level can move towards the long wave direction. On the other hand, the device has strong regulation capability, for example, in the vicinity of the wavelength λ of 9.1 μm, the absorption rate is 0.19 when the graphene fermi level is 0, and the absorption rate is 0.32 when the graphene fermi level is 0.64eV, and the regulation intensity is about 70%. As just one example, in the vicinity of stronger magnetic resonance intensity, for example, as shown in fig. 3 after optimization in embodiment 1, when the fermi level of 0.64eV of graphene is compared with the fermi level of 0eV, the specific energy modulation ratio of the position of the graphene cavity resonance peak can reach more than 300%.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (3)
1. Based on many resonance plasma excimer device of graphite alkene and magnetic resonance mode coupling, its characterized in that: the multi-resonance plasmon device is based on coupling of graphene and a magnetic resonance mode, and comprises gold thin film gratings, a wrapped optical medium layer, single-layer or multi-layer graphene and a gold thin film substrate which are uniformly distributed from top to bottom; the optical medium layer wraps two sides of the single-layer or multi-layer graphene, the uniformly distributed gold thin film grating and the optical medium layer are in direct physical contact, and the gold thin film substrate is used as a reflector and is in direct physical contact with the optical medium layer;
the working waveband range of the external environment of the multi-resonance plasmon device is 5-20 microns;
the gold film grating is formed by parallelly arranging gold nanowires with the same thickness, width and length, and can be a one-dimensional grating or a two-dimensional grating;
the structural size of the gold thin-film grating is smaller than the wavelength of light waves in a working waveband; the period range of the gold thin-film grating is 200-10000 nm; the length range of the gold thin-film grating nanowire is more than 50nm, the width range is 50 nm-10000 nm, and the thickness range is 10 nm-300 nm; the slit distance between two gold nanowires of the gold film grating ranges from 3nm to 1000 nm;
the thickness range of two optical medium layers between the gold film grating and the gold film substrate is 0.3 nm-500 nm;
the Fermi level range of the graphene is 0-1.2 eV;
the thickness of the gold film substrate is more than 20 nm.
2. The graphene-based and magnetic resonance mode-coupled multi-resonance plasmonic device of claim 1, wherein: the period of the gold film grating is 1710nm, a one-dimensional grating with infinite length of gold nanowires is adopted, the width of the gold nanowires is 1690nm, the distance between adjacent gold nanowires is 20nm, and the thickness of the gold nanowires is 30 nm; the optical medium layers between the metal film grating and the metal film substrate and wrapping the two sides of the graphene are CaF2Refractive index of 1.4, upper CaF2And lower CaF2The thickness of the film is 30nm, the thickness of the gold film substrate is 30nm, and the Fermi level of the single-layer graphene is set to be 0.64 eV.
3. The graphene-based and magnetic resonance mode-coupled multi-resonance plasmonic device of claim 1, wherein: the period of the gold film grating is1710nm, adopting a one-dimensional grating with infinite length of the gold nanowires, wherein the width of the gold nanowires is 1680nm, the distance between adjacent gold nanowires is 30nm, and the thickness of the gold nanowires is 30 nm; the optical medium layers between the metal film grating and the metal film substrate and wrapping the two sides of the graphene are CaF2Refractive index of 1.4, upper CaF2And lower CaF2The thickness of the film is 15nm, the thickness of the gold film substrate is 30nm, and the Fermi level of the single-layer graphene is set to be 0.34-0.64 eV.
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Cited By (2)
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| CN113433606A (en) * | 2021-06-22 | 2021-09-24 | 武汉大学 | Quasi-metal line structure for realizing on-chip wavefront shaping and application of asymmetric transmission |
| CN114355490A (en) * | 2021-12-30 | 2022-04-15 | 大连大学 | Double-plasmon resonance wavelength tuner based on double-layer graphene nanoribbon structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113433606A (en) * | 2021-06-22 | 2021-09-24 | 武汉大学 | Quasi-metal line structure for realizing on-chip wavefront shaping and application of asymmetric transmission |
| CN113433606B (en) * | 2021-06-22 | 2022-03-04 | 武汉大学 | Quasi-metal line structure for realizing on-chip wavefront shaping and application of asymmetric transmission |
| CN114355490A (en) * | 2021-12-30 | 2022-04-15 | 大连大学 | Double-plasmon resonance wavelength tuner based on double-layer graphene nanoribbon structure |
| CN114355490B (en) * | 2021-12-30 | 2024-03-01 | 大连大学 | Double-layer graphene nanoribbon structure-based double-plasmon resonance wavelength tuner |
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