CN110275329A - A kind of circularly polarized laser light source couples microcavity - Google Patents
A kind of circularly polarized laser light source couples microcavity Download PDFInfo
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- CN110275329A CN110275329A CN201910531142.3A CN201910531142A CN110275329A CN 110275329 A CN110275329 A CN 110275329A CN 201910531142 A CN201910531142 A CN 201910531142A CN 110275329 A CN110275329 A CN 110275329A
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- microcavity
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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
- G02F1/0136—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 for the control of polarisation, e.g. state of polarisation [SOP] control, polarisation scrambling, TE-TM mode conversion or separation
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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
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
A kind of circularly polarized laser light source couples microcavity, it is that one-dimensional layer structure is distributed along z-axis, extend in xoy plane, the microcavity is intercoupled by described ABCD layers, representation is DADBDCD, wherein D layers are metal material, A layers, C layers are respectively electromagnetic wave gain and material, the B layers of defect layer constituted for magneto-optic memory technique are lost in electromagnetic wave.Herein using conjugation microcavity and magnetic microcavity coupled resonance realize laser amplifier and circular polarization output be combined into one.The present invention to formed circularly polarized laser output to C layer and A layer gain and be lost parameter requirement it is more relaxed, it is highly beneficial to the design of practical devices.Result of the invention is actually that a variety of physical processes intercouple as a result, having opened up new thinking to design novel circularly polarized laser light source.
Description
Technical field
The present invention relates to a kind of circularly polarized laser light source more particularly to a kind of utilization gains and loss microcavity, magnetic microcavity
A composite construction system is formed with metal layer, obtains the integral structure of circular polarization and laser output.
Background technique
Circular polarization characteristics laser varies less in propagation in atmosphere, and circularly polarized light has rotational symmetry, the property of system
It can not be influenced by two communication terminal relative motions, reduce the realization difficulty of technology, there is very high reliability, therefore moving
There is important application in mobile communication terminal and free space optical communication field.But it is solid that existing semiconductor laser is only capable of generation direction
Fixed linearly polarized light beam cannot issue linearly polarized light and circularly polarized light along any direction polarization.If necessary to all kinds of inclined
The laser beam of polarization state, the optical devices such as polarizing film that can only be big and expensive by volume or wave plate are placed in laser emitting light beam institute
By path could generate.For the cost and volume for reducing circularly polarized laser equipment, researcher is by plasma nano device
It is integrated in laser emitting end face, the light beam for generating laser is first converted into and propagates on end face from releasing immediately
Surface plasma.By the design to end face nanostructure, the direction of propagation of surface plasma can control, and each
The intensity and phase in direction.These surface plasmas are finally released, and become the free light wave of multi beam, they are superimposed in space
Combination, can produce required polarization state light.But in this type of design, the generation process of laser and the control process of polarization state
It is two stages of separation, further relates to nanoprocessing, designs considerably complicated.If can be the generation of laser and the control of polarization state
System is combined into one, and undoubtedly can be reduced the complexity of design.The optics Parity- of gain in recent years and lossy medium specific distribution
Time (PT) symmetrical structure shows unique advantage in the design aspect that optic communication device, optical element and light manipulate, for solution
Certainly the problem of conventional photonic device provides new solution, than more typical as photoswitch, high sensitive sensor, laser are inhaled
Receive device, optoisolator, wireless power transmission etc..The spatial distribution of PT symmetrical structure refractive index needs to meet real and imaginary parts point
Not Wei even symmetry and odd symmetry condition.A pair of of coupled micro-cavity that refractive index meets complex conjugate condition is common PT symmetric system
System.In addition, the optical properties based on film magnet-optical medium have been widely studied.
Inoue et al. proves that magnet-optical medium defect is mixed in 1-D photon crystal can be enhanced Faraday rotation effect,
Realize optical isolation function.But the magneto-optic effect very little of material under normal conditions, to improve magneto-optic effect, researcher is magneto-optic effect
It is combined with metal surface plasma body excimer, academia claims " magnetopasma " (magnetoplasmonics), utilizes them
The active plasma device (active plasmonic devices) of mutual modulation design.Surface plasma body resonant vibration increases
Strong magneto-optic memory technique built-in field intensity, so as to which magneto-optic effect is improved an order of magnitude.But there is damage in such structure
Consumption is less able to achieve gain amplification.
Summary of the invention
The present invention will establish gain and the coupled system of microcavity, metal surface plasmon resonance and magnetic microcavity be lost,
The system is since the presence of metal is unsatisfactory for PT symmetric condition, but coupled micro-cavity and metallic plasma are in specific matching parameter
Under the conditions of, it remains to generate superpower resonance mode, significantly enhances Faraday rotation effect, realize that a variety of polarization states are defeated
Out.Particularly, by optimum structural parameter, while laser amplifier and circular polarization output being realized, to be circularly polarized laser light source
Design provide a kind of simple and easy method.
The technical scheme is that a kind of circularly polarized laser light source couples microcavity, is one-dimensional layer structure along z axis point
Cloth extends in xoy plane, and the microcavity is intercoupled by described ABCD layers, representation DADBDCD, wherein
D layers are metal material, and A layers, C layers are respectively electromagnetic wave gain and material is lost in electromagnetic wave, and B layers are magneto-optic memory technique composition
Defect layer.
The thickness of preferred each layer: A, C with a thickness of 400nm, B layers with a thickness of 800nm, D layers with a thickness of 205nm.
Preferably, the effective metal plasma body frequency of metal material layer is 4 × 1015S-1.Such as silver can meet
Requirement above-mentioned.
Preferably, electromagnetic wave gain material is Quantum Well or III-V compound semiconductor.For example, electromagnetic wave gain material
Material is neodymium aluminium oxide laser gain material, is dissolved into alpha-alumina crystals and is generated by the neodymium ion of high concentration.
Preferably, electromagnetic wave loss material is one in ferrite, conductive carbon black, graphite, carbon fiber and silicon carbide fibre
Kind.For example, electromagnetic wave loss material above-mentioned is graphene.
Preferably, magneto-optic memory technique is rare earth magneto-optic memory technique.
Preferably, the diagonal element ε of magneto-optic memory technique above-mentioned dielectric tensors under external magnetic field1Equal to 2, make in external magnetic field
With lower dielectric tensors nondiagonal element ε2Equal to 0.025, aforementioned electromagnetic wave gain material material gain coefficient ρAIt is lost equal to electromagnetic wave
Material loss factor ρBEqual to 0.041, circular polarization is realized simultaneously in outgoing and reflection both direction at λ=1368.56nm
Laser output.
Preferably, the method that the aforementioned ABCD layer stated intercouples is plating, vapor deposition, vacuum splashing and plating, ion exchange
It is one or more.
The principle of the present invention is: electromagnetic wave forms evanescent field in metal inside, forms plasma resonance in metal surface,
A layers have attenuation to incident light, and C layer can produce amplification, we A layer with C layers be referred to as be conjugated it is micro-
Chamber, because their dielectric constant constitutes conjugate complex number.The system since the presence of metal is unsatisfactory for PT symmetric condition, but still
With the light amplification of PT symmetrical structure and Faraday rotation enhancement effect.Namely not along the polarized incident electric fields of x axis direction
It can generate along the polarized electric field of y axis direction.Under conditions of there are magneto-optic effect, along the polarized incident electric fields of x axis direction
It can generate along the polarized electric field of y axis direction, two mutually orthogonal electric field synthesis lead to the change for being emitted polarized state, also
It is Faraday effect.The size along y axis direction polarized electric field that the size of Faraday effect is generated depending on coupling, and
Near optimal parameter above-mentioned, it just will appear the circularly polarized laser output of almost Perfect.
Work as dA=dC=400nm, dB=800nm, dD=205nm, ωep=4 × 1015S-1, ε1=2, ε2=0.025, ρA=ρB=
0.041, realize the circularly polarized laser output of almost Perfect simultaneously in outgoing and reflection both direction at λ=1368.56nm.
The amplification of structure arises primarily at conjugation microcavity, and conjugation microcavity can convert electromagnetic energy for external energy, from
And make structure transmission spectrum with super strength and reflectance spectrum.On the other hand, due to the coupled resonance of conjugation microcavity, energy of electromagnetic field
From gain microcavity to loss microcavity transmitting, lead to the Interaction enhanced of electromagnetism in magnetic microcavity.Inside magnetic microcavity, due to magnetic
Luminous effect generates the nondiagonal element of dielectric constant, and electric field is coupled out the vibration in magnetic field in its identical polarization direction, thus with
The vertical direction of former electric field inspires electric field oscillation, generates additional component, forms circular polarization or elliptical polarization.Form circular polarization
Laser output to C layer and A layer gain and be lost parameter requirement it is more relaxed, it is highly beneficial to the design of practical devices,
The purpose of the present invention is obtaining circularly polarized laser, but perfect circular polarization need electric field in mutually orthogonal both direction amplitude and
Phase meets stringent condition, thus under normal circumstances magnetic microcavity output be elliptical polarization.In aforementioned optimal structure, due to
It is conjugated the superpower resonance of microcavity and the symmetry of structure, exports perfect circularly polarized laser under given conditions.
Beneficial effect
1. herein using conjugation microcavity and magnetic microcavity coupled resonance realize laser amplifier and circular polarization output be combined into one.
2. the present invention to formed circularly polarized laser output to C layer and A layer gain and be lost parameter requirement it is wider
Pine, it is highly beneficial to the design of practical devices.
3. it is since outside pumping provides energy, pole to gain media under conditions of resonance that structure, which is excited the reason of amplification,
The change of change state is that energy enhances magnetic microcavity internal electric field and magnetic field during gain microcavity and loss microcavity transmitting
Interaction.Therefore result of the invention is actually the result that a variety of physical processes intercouple.The present invention
Also new thinking has been opened up to design novel circularly polarized laser light source.
Detailed description of the invention
Fig. 1, structural schematic diagram of the invention
Fig. 2, the polarized state that the present invention is emitted and emits in certain wave strong point
Fig. 3, ρ of the present inventionA=ρBProjection and reflectance spectrum and corresponding phase difference when=0.041.
Specific embodiment
Embodiment 1
A kind of circularly polarized laser light source couples microcavity is that one-dimensional layer structure is distributed along z axis, extends in xoy plane, institute
It states microcavity to be intercoupled by described ABCD layers, representation DADBDCD, wherein D layers are metal material, A layers, C
Layer is respectively electromagnetic wave gain and material, the B layers of defect layer constituted for magneto-optic memory technique are lost in electromagnetic wave.The thickness of each layer: A, C
With a thickness of 400nm, B layers with a thickness of 800nm, D layers with a thickness of 205nm.Metal material layer is silver, effective metal
Plasma frequency is 4 × 1015S-1.Electromagnetic wave gain material is neodymium aluminium oxide laser gain material, by the neodymium ion of high concentration
It is dissolved into alpha-alumina crystals and generates.It is graphene that material, which is lost, in electromagnetic wave.Magneto-optic memory technique is rare earth magneto-optic memory technique, the magneto-optic
The diagonal element ε of material dielectric tensors under external magnetic field1Equal to 2, the dielectric tensors nondiagonal element ε under external magnetic field2It is equal to
0.025, aforementioned electromagnetic wave gain material material gain coefficient ρAMaterial loss factor ρ is lost equal to electromagnetic waveBIt is equal to
0.041, realize that circularly polarized laser exports simultaneously in outgoing and reflection both direction at λ=1368.56nm.It is ABCD layers above-mentioned
The method to intercouple is that plating, vapor deposition, vacuum splashing and plating, ion exchange are one or more.
Embodiment 2
A kind of circularly polarized laser light source couples microcavity is that one-dimensional layer structure is distributed along z axis, extends in xoy plane, institute
It states microcavity to be intercoupled by described ABCD layers, representation DADBDCD, wherein D layers are metal material, A layers, C
Layer is respectively electromagnetic wave gain and material, the B layers of defect layer constituted for magneto-optic memory technique are lost in electromagnetic wave.The thickness of each layer: A, C
With a thickness of 400nm, B layers with a thickness of 800nm, D layers with a thickness of 205nm.Metal material layer is silver, effective metal
Plasma frequency is 4 × 1015S-1.Electromagnetic wave gain material is neodymium aluminium oxide laser gain material, by high concentration neodymium from
Son is dissolved into alpha-alumina crystals and generates.It is graphene that material, which is lost, in electromagnetic wave.Magneto-optic memory technique is rare earth magneto-optic memory technique, the magnetic
The diagonal element ε 1 of luminescent material dielectric tensors under external magnetic field is equal to 2, the dielectric tensors nondiagonal element ε 2 under external magnetic field
Equal to 0.025, aforementioned electromagnetic wave gain material material gain coefficient ρ A is equal to electromagnetic wave loss material loss factor ρ B etc.
In 0.0356, realize that circularly polarized laser exports simultaneously in outgoing and reflection both direction at λ=1350.7nm.ABCD above-mentioned
The method that intercouples of layer is that plating, vapor deposition, vacuum splashing and plating, ion exchange are one or more.
Embodiment 3
A kind of elliptical polarization laser light source coupled micro-cavity is one-dimensional layer structure along the distribution of z axis, is extended in xoy plane,
The microcavity is intercoupled by described ABCD layers, representation DADBDCD, wherein D layers are metal material, A layers, C
Layer is respectively electromagnetic wave gain and material, the B layers of defect layer constituted for magneto-optic memory technique are lost in electromagnetic wave.The thickness of each layer: A, C
With a thickness of 400nm, B layers with a thickness of 800nm, D layers with a thickness of 205nm.Metal material layer is silver, effective metal
Plasma frequency is 4 × 1015S-1.Electromagnetic wave gain material is neodymium aluminium oxide laser gain material, by the neodymium ion of high concentration
It is dissolved into alpha-alumina crystals and generates.It is graphene that material, which is lost, in electromagnetic wave.Magneto-optic memory technique is rare earth magneto-optic memory technique, the magneto-optic
The diagonal element ε 1 of material dielectric tensors under external magnetic field is equal to 2, dielectric tensors nondiagonal element ε 2 etc. under external magnetic field
In 0.025, aforementioned electromagnetic wave gain material material gain coefficient ρAMaterial loss factor ρ is lost equal to electromagnetic waveBIt is equal to
0.0196, realize that elliptical polarization laser exports simultaneously in outgoing and reflection both direction at λ=1368.9nm.ABCD above-mentioned
The method that intercouples of layer is that plating, vapor deposition, vacuum splashing and plating, ion exchange are one or more.
Claims (10)
1. a kind of circularly polarized laser light source couples microcavity, which is characterized in that be that one-dimensional layer structure is distributed along z axis, in xoy
Extend in plane, the microcavity is intercoupled by described ABCD layers, representation DADBDCD, wherein D layers are metal
Material, A layers, C layers are respectively electromagnetic wave gain and material, the B layers of defect layer constituted for magneto-optic memory technique are lost in electromagnetic wave.
2. circularly polarized laser light source couples microcavity according to claim 1, which is characterized in that A, C with a thickness of 400nm, B
Layer with a thickness of 800nm, D layers with a thickness of 205nm.
3. circularly polarized laser light source couples microcavity according to claim 1, which is characterized in that the metal material layer
Effective metal plasma body frequency is 4 × 1015S-1。
4. circularly polarized laser light source couples microcavity according to claim 1, which is characterized in that the electromagnetic wave gain material
Material is Quantum Well or III-V compound semiconductor.
5. circularly polarized laser light source couples microcavity according to claim 4, which is characterized in that the electromagnetic wave gain material
Material is neodymium aluminium oxide laser gain material, is dissolved into alpha-alumina crystals and is generated by the neodymium ion of high concentration.
6. circularly polarized laser light source couples microcavity according to claim 1, which is characterized in that material is lost in the electromagnetic wave
Material is one of ferrite, conductive carbon black, graphite, carbon fiber and silicon carbide fibre.
7. circularly polarized laser light source couples microcavity according to claim 6, which is characterized in that material is lost in the electromagnetic wave
Material is graphene.
8. circularly polarized laser light source couples microcavity according to claim 1, which is characterized in that the magneto-optic memory technique is dilute
Native magneto-optic memory technique.
9. circularly polarized laser light source couples microcavity according to claim 1, which is characterized in that the magneto-optic memory technique is outside
The diagonal element ε of dielectric tensors under magnetic fields1Equal to 2, the dielectric tensors nondiagonal element ε under external magnetic field2Equal to 0.025, electricity
Magnetic wave gain material material gain coefficient ρAMaterial loss factor ρ is lost equal to electromagnetic waveBEqual to 0.041, λ=
1368.56nm is in outgoing and reflection both direction while realizing that circularly polarized laser exports.
10. circularly polarized laser light source couples microcavity described according to claim 1 ~ 9, which is characterized in that the ABCD layer phase
The method of mutual coupling is that plating, vapor deposition, vacuum splashing and plating, ion exchange are one or more.
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| CN201910531142.3A CN110275329A (en) | 2019-06-19 | 2019-06-19 | A kind of circularly polarized laser light source couples microcavity |
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| CN201910531142.3A CN110275329A (en) | 2019-06-19 | 2019-06-19 | A kind of circularly polarized laser light source couples microcavity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111029900A (en) * | 2019-12-25 | 2020-04-17 | 中国科学院半导体研究所 | Three-cavity coupling laser based on space-weighted time symmetry |
| CN113608372A (en) * | 2021-07-14 | 2021-11-05 | 江苏大学 | PT symmetrical coupling microcavity and magnetic microcavity composite structure and application thereof |
-
2019
- 2019-06-19 CN CN201910531142.3A patent/CN110275329A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111029900A (en) * | 2019-12-25 | 2020-04-17 | 中国科学院半导体研究所 | Three-cavity coupling laser based on space-weighted time symmetry |
| CN111029900B (en) * | 2019-12-25 | 2020-11-03 | 中国科学院半导体研究所 | Three-cavity coupling laser based on space-weighted time symmetry |
| CN113608372A (en) * | 2021-07-14 | 2021-11-05 | 江苏大学 | PT symmetrical coupling microcavity and magnetic microcavity composite structure and application thereof |
| CN113608372B (en) * | 2021-07-14 | 2024-03-19 | 江苏大学 | PT symmetrical coupling microcavity and magnetic microcavity composite structure and application thereof |
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