CN106200024A - Magneto-optic thin film magnetic surface fast wave optical diode - Google Patents

Magneto-optic thin film magnetic surface fast wave optical diode Download PDF

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Publication number
CN106200024A
CN106200024A CN201610796109.XA CN201610796109A CN106200024A CN 106200024 A CN106200024 A CN 106200024A CN 201610796109 A CN201610796109 A CN 201610796109A CN 106200024 A CN106200024 A CN 106200024A
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magneto
thin film
optic
optical diode
background media
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CN201610796109.XA
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欧阳征标
郑耀贤
王琼
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Priority to PCT/CN2017/099811 priority patent/WO2018041174A1/en
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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
    • G02F1/01—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 for the control of the intensity, phase, polarisation or colour 
    • G02F1/09—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 for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect
    • G02F1/093—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 for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect used as non-reciprocal devices, e.g. optical isolators, circulators
    • 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
    • G02F1/01—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 for the control of the intensity, phase, polarisation or colour 
    • G02F1/09—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 for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect
    • 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
    • G02F1/01—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 for the control of the intensity, phase, polarisation or colour 
    • G02F1/09—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 for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect
    • G02F1/095—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 for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect in an optical waveguide structure
    • 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
    • G02F1/01—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 for the control of the intensity, phase, polarisation or colour 
    • G02F1/09—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 for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect
    • G02F1/095—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 for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect in an optical waveguide structure
    • G02F1/0955—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 for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect in an optical waveguide structure used as non-reciprocal devices, e.g. optical isolators, circulators

Abstract

The invention discloses a kind of magneto-optic thin film magnetic surface fast wave optical diode, it includes a light input end mouth, optical output port, magneto-optic thin film, background media, a bias magnetic field；Described magneto-optic thin film is arranged in background media；Described magneto-optic thin film uses magneto-optic memory technique；Described optical diode and isolator are made up of magneto-optic memory technique and background media；The left end of described optical diode and isolator is light input end, and its right-hand member is light output end；Described magneto-optic memory technique is magnetic surface fast wave with the surface of background media；It is provided with bias magnetic field at described magneto-optic thin film.Present configuration is simple, and light transmissioning efficiency is high, and volume is little, it is simple to integrated, is suitable for extensive light path integrated, is with a wide range of applications.

Description

Magneto-optic thin film magnetic surface fast wave optical diode
Technical field
The present invention relates to a kind of magneto-optic memory technique, surface magnetic wave and optical diode, it is more particularly related to a kind of magnetic Optical thin film magnetic surface fast wave optical diode.
Background technology
Optical diode and isolator are a kind of the optics allowing light to propagate toward a direction, and being applied to prevention need not The light feedback wanted.Traditional optical diode and the major component of isolator are Faraday polarization apparatus, apply Faraday effect (magneto-optic Effect) as its operation principle.Traditional faraday isolator is made up of the polarizer, Faraday polarization apparatus and analyzer, this Device architecture is complicated, method be generally applied in the photosystem of free space.For integrated optical circuit, the Integrated Light device such as optical fiber or waveguide Part is all unpolarized maintenance system, can cause the loss of the angle of polarization, thus inapplicable faraday isolator.
Summary of the invention
It is an object of the invention to overcome weak point of the prior art, it is provided that a kind of simple in construction is effective, and optical transport is imitated Rate is high, and volume is little, it is simple to integrated magneto-optic memory technique thin film magnetic surface fast wave optical diode.
The purpose of the present invention is achieved by following technical proposals.
The one magneto-optic thin film magnetic surface fast glistening light of waves two pipe of the present invention include a light input end mouth, optical output port, One magneto-optic thin film, background media, a bias magnetic field；Described magneto-optic thin film is arranged in background media；Described magneto-optic thin film Use magneto-optic memory technique；Described optical diode and isolator are made up of magneto-optic memory technique and background media；Described optical diode and isolation The left end of device is light input end, and its right-hand member is light output end；Described magneto-optic memory technique and the surface of background media are that magnetic surface is fast Ripple；It is provided with bias magnetic field at described magneto-optic thin film.
Described magnetic surface fast wave optical diode is arranged in background media by magneto-optic thin film and constitutes.
Described optical diode is made up of fiber waveguide the separating surface of magneto-optic thin film Yu background media can one-way transmission optical signal.
Described magneto-optic thin film is straight wave guide structure with the separating surface of background media.
Described straight wave guide is TE mode of operation waveguide.
Described magneto-optic memory technique is magneto-optic glass or various rare earth doped garnet and rare earth-transition metal alloy The materials such as thin film.
Described background media material is the material that operating wave is transparent.
Described background media material is common dielectric material, air or glass.
Described bias magnetic field is produced by electric magnet or permanent magnet.
Present invention is suitably applied to extensive light path integrated, be with a wide range of applications.It compared with prior art has There is following good effect.
1. simple in construction, it is simple to realize.
2. light transmissioning efficiency is high.
3. volume is little, it is simple to integrated.
Accompanying drawing explanation
Fig. 1 is the structure chart of magneto-optic thin film magnetic surface fast wave optical diode.
In figure: light input end mouth 1 optical output port 2 magneto-optic thin film 3 background media 4 bias magnetic fieldMagneto-optic thin film is thick Degree w
Fig. 2 is the one-way conduction fundamental diagram of magneto-optic thin film magnetic surface fast wave optical diode.
Fig. 3 is the first that forward and reverse efficiency of transmission of magneto-optic thin film magnetic surface fast wave optical diode changes with frequency of light wave Embodiment curve chart.
Fig. 4 is the second that forward and reverse efficiency of transmission of magneto-optic thin film magnetic surface fast wave optical diode changes with frequency of light wave Embodiment curve chart.
Fig. 5 be forward and reverse efficiency of transmission of magneto-optic thin film magnetic surface fast wave optical diode change with frequency of light wave the third Embodiment curve chart.
Detailed description of the invention
As it is shown in figure 1, magneto-optic memory technique thin film magnetic surface fast wave optical diode of the present invention includes a light input end mouth 1, 2, magneto-optic thin film 3 of individual optical output port, background media 4 and a bias magnetic field H0；Magnetic surface fast wave optical diode is by magnetic Luminescent material thin film 3 is arranged in background media 4 composition, and magneto-optic thin film 3 uses magneto-optic memory technique, i.e. magneto-optic memory technique thin film, magneto-optic material Material thin film 3 and background media 4 interface are the region that light energy is mainly concentrated, by the boundary of magneto-optic memory technique thin film Yu background media Face constitute fiber waveguide can one-way transmission optical signal, be optical diode, optical diode and isolator and be situated between by magneto-optic memory technique and background Matter is constituted.Magneto-optic memory technique is magneto-optic glass or various rare earth doped garnet and rare earth-transition metal alloy thin film Deng material；Magneto-optic memory technique thin film 3 is straight wave guide structure with the separating surface of background media 4, and waveguide of the present invention is TE mode of operation ripple Lead；Magneto-optic memory technique thin film 3 is magnetic surface fast wave with the surface of background media 4；Background media material can use operating wave saturating Bright material, it would however also be possible to employ common dielectric material, air or glass.It is provided with bias magnetic field at magneto-optic memory technique thin film 3 Bias magnetic field H0Produced by electric magnet or permanent magnet by bias magnetic field；As bias magnetic field H0It is perpendicular to paper inwards Time, the left end of optical diode and isolator is light input end, and its right-hand member is light output end；It is defeated that light wave is input to port 2 from port 1 Go out for one-way conduction.
Surface magnetic wave produced by magneto-optic memory technique-medium interface is that one is similar to metallic surface plasma excimer (SPP) Phenomenon.Magneto-optic memory technique is under the effect of biasing magnetostatic field, and pcrmeability is tensor form, meanwhile, in certain optical band scope In, its effective refractive index is negative value.Thus, the surface of magneto-optic memory technique can produce a kind of guided wave, and has the property of one way propagation Can, referred to as surface magnetic wave (surface magnetopolaron ripple, SMP).
Magneto-optic memory technique thin-film waveguide magnetic surface fast wave optical diode of the present invention, is arranged at background media by magneto-optic memory technique thin film (air) is constituted, utilizes the magnetic surface fast wave that magneto-optic memory technique-medium interface produces to carry out the one-way transmission of light.
The technical scheme is that the light nonreciprocity being had based on magneto-optic memory technique and magneto-optic memory technique-medium interface are had Have a uniqueness can conduction surfaces wave property, it is achieved optical diode and the design of isolator.The ultimate principle of this technical scheme is as follows:
Magneto-optic memory technique is a kind of material with magnetic anisotropy, additional magnetostatic field cause the magnetic couple within magneto-optic memory technique Extremely son arranges at same direction, and then produces dipole moment.Strong interaction will be there is in dipole moment with optical signal, and then Produce the nonreciprocity transmission of light.It is the outside bias magnetic field H of vertical paper in direction0Effect under, the magnetic conductance of magneto-optic memory technique Rate tensor is:
[ μ 1 ] = μ r iμ κ 0 - iμ κ μ r 0 0 0 μ 0 , - - - ( 1 )
The matrix element of permeability tensor is given by below equation group:
μ r = μ 0 ( 1 + ω m ( ω 0 - i α ω ) ( ω 0 - i α ω ) 2 - ω 2 ) , μ κ = μ 0 ω m ω ( ω 0 - i α ω ) 2 - ω 2 , ω 0 = μ 0 γH 0 , ω m = μ 0 γM s - - - ( 2 )
Wherein, μ0For the pcrmeability in vacuum, γ is gyromagnetic ratio, H0For externally-applied magnetic field, MsFor saturation magnetization, ω is Operating frequency, α is loss factor.If change bias magnetic field direction be vertical paper inwards, then H0And MsBy reindexing.
Surface magnetic wave produced by magneto-optic memory technique-medium interface then can be according to the permeability tensor of magneto-optic memory technique and Mike This Wei solving equations draws.Meet electric field that surface wave (for TE ripple) exists at interface and should there be a following form in magnetic field:
E i = e x i 0 0 e i ( k z z + k y i y - ω t ) , H i = 0 h y i h z i e i ( k z z + k y i y - ω t ) - - - ( 3 )
Wherein i=1 represents magneto-optic memory technique region, and i=2 represents areas of dielectric.Substitution maxwell equation group:
▿ × E i = - j ∂ E x i ∂ z - k ∂ E x i ∂ y = - ∂ B i ∂ t , ▿ × H i = - ∂ D i ∂ t , - - - ( 4 )
Further according to constitutive relationship and boundary condition, wave vector k about surface magnetic wave can be drawnzTranscendental equation:
μ e μ 0 ω 2 μ 0 ϵ 0 - k z 2 + ω 2 μ e ϵ 1 - k z 2 - jμ k μ r k z = 0 , - - - ( 5 )
Wherein,Effective permeability for magneto-optic memory technique.This transcendental equation can be asked by numerical solution Solve, finally give kzValue.Also can find out from equation, owing to equation comprises μκkzItem, so, surface magnetic wave has nonreciprocal Property (one way propagation).
Visible, at magneto-optic memory technique thin film, add biasing magnetostatic field, and use common dielectric material, air or glass conduct Background material, then effective optical diode will be constituted.As in figure 2 it is shown, use yttrium iron garnet (YIG) as magnetic anisotropy Material, background media is air (n0=1), the bias magnetic field size of magneto-optic thin film is 900Oe, the long l=of size of magneto-optic thin film 3 50mm, its thickness w=22.5mm,.Operating frequency f of device is by magneto-optic memory technique and the DIELECTRIC CONSTANT ε of medium1, ε2And pcrmeability [μ1], μ2Being determined, operating frequency is f=6GHz, YIG spillage of material factor alpha=3 × 10-4.It is in bias magnetic field H0Under effect, Biasing magnetostatic field direction be vertical paper inwards, when light inputs from port 1, magneto-optic memory technique-medium interface produce unidirectional just To the surface magnetic wave of transmission, finally export from port 2；When light inputs from port 2, owing to the nonreciprocity of surface magnetic wave causes Light wave can not inside device reverse transfer, thus cannot export from port 1, light energy is the most all blocked at port 2. The conducting direction of optical diode and isolator is determined by the direction of externally-applied magnetic field, when the magnetostatic field direction that magneto-optic memory technique is added With foregoing contrary time, its conducting direction is contrary.
The magneto-optic thin film magnetic surface fast wave optical diode of device of the present invention uses magneto-optic memory technique to be arranged at common dielectric material In, dimensions length l of magneto-optic thin film 3 and thickness w can select according to operation wavelength and actual demand neatly.Tie below Close accompanying drawing and provide three embodiments, use yttrium iron garnet (YIG) as magnetically anisotropic substance, bias magnetic field in an embodiment Size is 900Oe, magnetic direction be vertical paper inwards, thickness w, YIG spillage of material factor alpha=3 × 10 of magneto-optic thin film 3-4, Operating frequency f of device is by magneto-optic memory technique and the DIELECTRIC CONSTANT ε of medium1, ε2With pcrmeability [μ1], μ2Determined.
Embodiment 1
With reference to Fig. 1, magnetic surface fast wave optical diode is arranged in generic media by magneto-optic thin film and constitutes the fast glistening light of waves of magnetic surface Diode, background media 4 is air (n0=1), the thickness of magneto-optic thin film 3 is w=5mm.In working frequency range, defeated from port 1 The light wave entered will produce surface magnetic wave at device inside, and then be exported from port 2 by device；And from the light wave of port 2 input To be stopped by device, it is impossible to export from port 1.With reference to Fig. 3, the optical diode of straight wave guide structure and the operating frequency of isolator Scope is 4.52GHz～7.26GHz.In operating frequency range, it is considered to spillage of material, optical diode and isolator are up to Forward and reverse transmission isolation is 21.9586dB, and forward transmission insertion loss is 0.0146dB.
Embodiment 2
With reference to Fig. 1, magnetic surface fast wave optical diode is arranged in generic media by magneto-optic thin film and constitutes, and background media 4 is Air (n0=1), the thickness of magneto-optic thin film 3 is w=7mm.In working frequency range, the light wave from port 1 input will be in device Portion produces surface magnetic wave, and then is exported from port 2 by device；And will be stopped by device from the light wave of port 2 input, it is impossible to Export from port 1.With reference to Fig. 4, the optical diode of straight wave guide structure and the operating frequency range of isolator be 4.58GHz～ 7.20GHz.In operating frequency range, it is considered to spillage of material, optical diode and isolator are up to forward and reverse transmission isolation Degree is 25.0863dB, and forward transmission insertion loss is 0.0146dB.
Embodiment 3
With reference to Fig. 1, magnetic surface fast wave optical diode is arranged in generic media by magneto-optic thin film and constitutes, and background media 4 is Glass (n0=1.5), the thickness of magneto-optic thin film 3 is w=7mm.In working frequency range, the light wave from port 1 input will be at device The internal surface magnetic wave that produces, and then exported from port 2 by device；And the light wave inputted from port " 2 " will be stopped by device, Cannot export from port 1.With reference to Fig. 5, the optical diode of straight wave guide structure and the operating frequency range of isolator be 4.62GHz～ 7.16GHz.In operating frequency range, it is considered to spillage of material, optical diode and isolator are up to forward and reverse transmission isolation Degree is 23.6151dB, and forward transmission insertion loss is 0.0622dB.
Efficiency of transmission curve chart by the magneto-optic thin film magnetic surface fast wave optical diode of Fig. 3, Fig. 4 and Fig. 5 different parameters can To obtain the light frequency range of magneto-optic thin film waveguide transmitted magnetic surface fast wave, the i.e. operating frequency range of optical diode.From knot Fruit understands, and present invention magnetic surface based on magneto-optic memory technique thin-film waveguide fast wave optical diode can effectively work.
Present invention described above all has improvements in detailed description of the invention and range of application, is not construed as this Bright restriction.

Claims (9)

1. a magneto-optic thin film magnetic surface fast wave optical diode, it is characterised in that: it includes that a light input end mouth, a light are defeated Go out port, magneto-optic thin film, background media, a bias magnetic field；Described magneto-optic thin film is arranged in background media；Described magnetic Optical thin film uses magneto-optic memory technique；Described optical diode and isolator are made up of magneto-optic memory technique and background media；Described optical diode Being light input end with the left end of isolator, its right-hand member is light output end；Described magneto-optic memory technique is magnetic with the surface of background media Surface fast wave；It is provided with bias magnetic field at described magneto-optic thin film.
2. according to the magneto-optic thin film magnetic surface fast wave optical diode described in claim 1, it is characterised in that: described magnetic surface fast wave Optical diode is arranged in background media by magneto-optic thin film and constitutes.
3. according to the non-leakage magnetic optical thin film magnetic surface fast wave optical diode described in claim 1, it is characterised in that: described light two Pole pipe is made up of fiber waveguide the separating surface of magneto-optic thin film Yu background media can one-way transmission optical signal.
4. according to the magneto-optic thin film magnetic surface fast wave optical diode described in claim 1, it is characterised in that: described magneto-optic thin film with The separating surface of background media is straight wave guide structure.
5. according to the magneto-optic thin film magnetic surface fast wave optical diode described in claim 1, it is characterised in that: described straight wave guide is TE Mode of operation waveguide.
6. according to the magneto-optic thin film magnetic surface fast wave optical diode described in claim 1, it is characterised in that: described magneto-optic memory technique is Magneto-optic glass or the material such as various rare earth doped garnet and rare earth-transition metal alloy thin film.
7. according to the magneto-optic thin film magnetic surface fast wave optical diode described in claim 1, it is characterised in that: described background media material Material is the material that operating wave is transparent.
8. according to the magneto-optic thin film magnetic surface fast wave optical diode described in claim 1, it is characterised in that: described background media material Material is common dielectric material, air or glass.
9. according to the magneto-optic thin film magnetic surface fast wave optical diode described in claim 1, it is characterised in that: described bias magnetic field by Electric magnet or permanent magnet produce.
CN201610796109.XA 2016-08-31 2016-08-31 Magneto-optic thin film magnetic surface fast wave optical diode Pending CN106200024A (en)

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PCT/CN2017/099811 WO2018041174A1 (en) 2016-08-31 2017-08-31 Magnetic surface fast wave photodiode with magneto-optical thin film

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