CN105093571A - Large-incident-angle magnetic photonic crystal broadband photoisolator - Google Patents
Large-incident-angle magnetic photonic crystal broadband photoisolator Download PDFInfo
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- CN105093571A CN105093571A CN201510465311.XA CN201510465311A CN105093571A CN 105093571 A CN105093571 A CN 105093571A CN 201510465311 A CN201510465311 A CN 201510465311A CN 105093571 A CN105093571 A CN 105093571A
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- dielectric layer
- photonic crystal
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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
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- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
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- Optics & Photonics (AREA)
- Optical Integrated Circuits (AREA)
Abstract
The invention discloses a large-incident-angle one-dimensional magnetic photonic crystal broadband photoisolator. The photoisolator is of a one-dimensional structure and is composed of magneto-optical medium layers (1), high refractive index dielectric layers (2) and low refractive index dielectric layers (3) which are arranged periodically along the axis Z, wherein the magneto-optical medium layers are made of YIG doped with Ce, the high refractive index dielectric layers are made of Si, the low refractive index dielectric layers are made of SiO2, and the structure of the photoisolator is controlled by the multiple magneto-optical medium layers and the three film layers repeatedly. The included angle phi (5) formed between an external magnetic field (4) and the optical axis of a light path is 19.95 degrees. According to the magnetic photonic crystal photoisolator, on the condition that the center wavelength lambda 0 is 1550 nanometers, YIG doped with Ce is adopted as the magneto-optical dielectric layers M, Si is adopted as the high refractive index dielectric layers H, SiO2 is adopted as the low refractive index dielectric layers L, and the external magnetic field is adopted; by means of the magneto-optical Faraday effect, broadband optical isolation with tolerance is achieved for the light incidence angle alpha (6).
Description
Technical field
The present invention is a kind of optoisolator based on one-dimensional magnetic photonic crystal, and especially a kind of optical communicating waveband large incident angle broadband light isolator, relates to the technical field of optical communication and optical information processing.
Background technology
Photonic crystal is the structure that a kind of dielectric material different by refractive index spatially becomes periodic distribution to be formed, and space periodic and operation wavelength are in same magnitude, has forbidden photon band and can control photon transmission.Magneto-opto photonic crystal is with a kind of composition material of magneto-optic memory technique as photonic crystal.Magneto-opto photonic crystal has the characteristic of magneto-optic effect and photonic crystal simultaneously, these two kinds of characteristics that can control photon is combined, will show the character of some uniquenesses.
Optoisolator is also called light isolator, a kind of the nonreciprocal passive device allowing forward transmission light to pass through, its principle of work is based on nonreciprocity, namely electromagnetic wave has extremely low insertion loss when positive dirction is propagated, and have huge decay along during transmission in the other direction or reflected, there is nonreversibility.Therefore it can eliminate the impact of reflected light on devices such as light sources, is one of Primary Component in all optical communication.Effect in light is integrated and the diode-like in circuit seemingly, have the title of " diode in light path ".
Large incident angle broadband light isolator based on magnetic photonic crystal has following advantage: device volume is little, is conducive to the integrated of light path; Little by ectocine, good stability; Production cost is low, is applicable to large batch of suitability for industrialized production; Light isolation width is large; Transmission spectrum good stability; Good to incident angle tolerance.
Large incident angle one-dimensional magnetic photonic crystal broadband light isolator realizes broadband light by the angle of adjustment dielectric layer periodic structure, dielectric layer material and externally-applied magnetic field and light path light axis isolates.By adjusting the angle of dielectric layer periodic structure and externally-applied magnetic field and light path light axis, making optoisolator transmission spectrum more stable, the tolerance to incident angle can be realized simultaneously.
Summary of the invention
Technical matters: the present invention seeks to propose a kind of large incident angle magnetic photonic crystal broadband light isolator based on one-dimensional magnetic photonic crystal, it utilizes Magnet-Optic Faraday Effect, achieve broadband light isolation angle of light degree to tolerance, meet the demand to optoisolator in practice further.
Technical scheme: in order to isolate width, transmission spectrum flatness and the demand to incident angle tolerance to optoisolator light in practical requirement, propose a kind of large incident angle broadband light isolator based on one-dimensional magnetic photonic crystal, the demand in practice can be met, have more using value.The present invention adopts the One Dimension Periodic structure of multi-layer magneto-optical dielectric layer as Faraday rotor, and is aided with the externally-applied magnetic field had angle with light path light axis, thus the large angle incidence broadband light achieved based on one-dimensional magnetic photonic crystal is isolated.
Large incident angle magnetic photonic crystal broadband light isolator of the present invention is in central wavelength lambda
0adopt under the condition of=1550nm that cerium substituted YIG Ce:YIG makes magnet-optical medium layer, silicon makes high index of refraction dielectric layer, silicon dioxide makes low-refraction dielectric layer, externally-applied magnetic field; Wherein magnet-optical medium layer, high index of refraction dielectric layer and low-refraction dielectric layer are the One Dimension Periodic structures along Z-direction arrangement, and the optical thickness of high index of refraction dielectric layer, low-refraction dielectric layer is λ
0/ 4, the optical thickness of magnet-optical medium layer is λ
0/ 2, its periodic arrangement order is:
(H/L)
x/ M/ (L/H)
y/ M/ (H/L)
z/ M/ (L/H)
z/ M/ (H/L)
y/ M/ (L/H)
x/ M/ (H/L)
x/ M/ (L/H)
y/ M/ (H/L)
z/ M/ (L/H)
z/ M/ (H/L)
y/ M/ (L/H)
x, wherein x=2, y=5, z=4; Angle between externally-applied magnetic field and Z axis
it is 19.95 °; H is high index of refraction dielectric layer, and L is low-refraction dielectric layer, and M is magnet-optical medium layer.
The periodic structure of dielectric layer and magnet-optical medium layer puts in order, and it is different from the periodic structure of conventional one-dimensional magnetic photonic crystal optoisolator, have employed multi-layer magneto-optical dielectric layer and three kinds of rete repeat numbers realize.
Based on the large incident angle broadband light isolator of one-dimensional magnetic photonic crystal, its light isolation processes is: the light propagated in the optical path is by becoming linearly polarized light after the polarizer, linearly polarized light is under the effect of externally-applied magnetic field, by one-dimensional magnetic photonic crystal rear polarizer direction deflection 45 degree, arrive in light path below finally by analyzer; The light reflected from light path, after the one-dimensional magnetic photonic crystal under analyzer and externally-applied magnetic field effect, polarization direction rotates 45 degree again, just in time becomes 90 degree of angles with the light transmission shaft of the polarizer, cannot be isolated by the polarizer.
Beneficial effect: a kind of large incident angle broadband light isolator based on one-dimensional magnetic photonic crystal that the present invention proposes, the broadband light isolation of 3.1nm near centre wavelength can be realized, and its transmission spectrum stability is better, has tolerance, can normally work within the scope of 0-6 degree to light wave incident angle.This device can meet in practice well isolates width, transmission spectrum stability and the demand to incident angle tolerance to optoisolator, has very high applying value.
Accompanying drawing explanation
Fig. 1 is the structural drawing of the large incident angle broadband magnetic photonic crystal optoisolator that the present invention proposes.
Fig. 2 is transmissivity and Faraday rotation angle, the curve of cyclical fluctuations figure when externally-applied magnetic field and light path light axis angle are 19.95 ° near centre wavelength.
Fig. 3 a is the different value figure corresponding when changing with angle of incidence of light of transmissivity,
Fig. 3 b is the different value figure corresponding when changing with angle of incidence of light in Faraday rotation angle.
Fig. 4 is 3.9 degree for working as angle of incidence of light, Faraday rotation angle and the transmissivity curve of cyclical fluctuations figure near centre wavelength when externally-applied magnetic field and light path light axis angle are 19.95 °.
Comprising: magnet-optical medium layer 1, high index of refraction dielectric layer 2, low-refraction dielectric layer 3, externally-applied magnetic field 4, angle between externally-applied magnetic field and light path light axis
5, light angle α 6.
Embodiment
Based on the large incident angle broadband light isolator of one-dimensional magnetic photonic crystal, it is in central wavelength lambda
0comprise under the condition of=1550nm that cerium substituted YIG (Ce:YIG) makes magnet-optical medium layer, silicon (Si) makes high index of refraction dielectric layer, silicon dioxide (SiO
2) make low-refraction dielectric layer, externally-applied magnetic field 4; The refractive index of above-mentioned dielectric substance is respectively: n
si=3.48, n
siO2=1.495; Magnet-optical medium layer ε
1=4.884, ε
2=0.009; The absorption of each material all can be ignored.Wherein the dielectric layer of magnet-optical medium layer, high index of refraction and low-refraction dielectric layer are the One Dimension Periodic structures along Z-direction arrangement, and the optical thickness of magnet-optical medium layer, dielectric layer is λ
0/ 4, the optical thickness of magnet-optical medium layer is λ
0/ 2, its periodic arrangement order is:
(H/L)
x/ M/ (L/H)
y/ M/ (H/L)
z/ M/ (L/H)
z/ M/ (H/L)
y/ M/ (L/H)
x/ M/ (H/L)
x/ M/ (L/H)
y/ M/ (H/L)
z/ M/ (L/H)
z/ M/ (H/L)
y/ M/ (L/H)
x, wherein x=2, y=5, z=4; Angle between externally-applied magnetic field and Z axis
it is 19.95 °.H is high index of refraction dielectric layer, and L is low-refraction dielectric layer, and M is magnet-optical medium layer.
The principle of work of large incident angle one-dimensional magnetic photonic crystal broadband light isolator is as follows: the light propagated in the optical path is by becoming linearly polarized light after the polarizer, linearly polarized light is under the effect of externally-applied magnetic field, by one-dimensional magnetic photonic crystal rear polarizer direction deflection 45 degree, arrive in light path below finally by analyzer; The light reflected from light path, after the one-dimensional magnetic photonic crystal under analyzer and externally-applied magnetic field effect, polarization direction rotates 45 degree again, just in time becomes 90 degree of angles with the light transmission shaft of the polarizer, cannot be isolated by the polarizer.
Claims (2)
1. a large incident angle magnetic photonic crystal broadband light isolator, is characterized in that this magnetic photonic crystal optoisolator is in central wavelength lambda
0adopt under the condition of=1550nm that cerium substituted YIG Ce:YIG makes magnet-optical medium layer (1), silicon makes high index of refraction dielectric layer (2), silicon dioxide makes low-refraction dielectric layer (3), externally-applied magnetic field (4); Wherein magnet-optical medium layer (1), high index of refraction dielectric layer (2) and low-refraction dielectric layer (3) are the One Dimension Periodic structures along Z-direction arrangement, and the optical thickness of high index of refraction dielectric layer (2), low-refraction dielectric layer (3) is λ
0/ 4, the optical thickness of magnet-optical medium layer (1) is λ
0/ 2, its periodic arrangement order is:
(H/L)
x/ M/ (L/H)
y/ M/ (H/L)
z/ M/ (L/H)
z/ M/ (H/L)
y/ M/ (L/H)
x/ M/ (H/L)
x/ M/ (L/H)
y/ M/ (H/L)
z/ M/ (L/H)
z/ M/ (H/L)
y/ M/ (L/H)
x, wherein x=2, y=5, z=4; Angle between externally-applied magnetic field (4) and Z axis
(5) be 19.95 °; H is high index of refraction dielectric layer, and L is low-refraction dielectric layer, and M is magnet-optical medium layer.
2. large incident angle magnetic photonic crystal broadband light isolator according to claim 1, it is characterized in that the periodic structure of dielectric layer and magnet-optical medium layer puts in order, it is different from the periodic structure of conventional one-dimensional magnetic photonic crystal optoisolator, have employed multi-layer magneto-optical dielectric layer and three kinds of rete repeat numbers realize.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105739135A (en) * | 2016-03-25 | 2016-07-06 | 南京邮电大学 | Magneto-optic isolator prepared from metamaterial with low dielectric constant |
| CN106200025A (en) * | 2016-08-31 | 2016-12-07 | 欧阳征标 | Non-leakage magnetic luminescent material void fraction wave magnetic conduction surface fast wave optical diode |
| CN108538933A (en) * | 2018-05-11 | 2018-09-14 | 南京工业大学 | Magneto-optical material microstructure photovoltaic radiator with nonreciprocity |
| CN108649304A (en) * | 2018-07-03 | 2018-10-12 | 南京林业大学 | A kind of electromagnetic wave isolator based on magnet-optical medium |
| US11092826B2 (en) | 2019-08-30 | 2021-08-17 | International Business Machines Corporation | Magneto-optical waveguide device and coupling methods |
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| CN103123421A (en) * | 2013-03-04 | 2013-05-29 | 太原理工大学 | One-dimensional magnetic photonic crystal for achieving broadband optical isolation |
| CN103472598A (en) * | 2013-10-12 | 2013-12-25 | 太原理工大学 | One-dimensional magnetic photonic crystal for implementing optical isolation |
| CN104483764A (en) * | 2014-11-11 | 2015-04-01 | 江苏大学 | Defective magneto photon crystal with non-reciprocity feature and purpose |
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2015
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Patent Citations (3)
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| CN103123421A (en) * | 2013-03-04 | 2013-05-29 | 太原理工大学 | One-dimensional magnetic photonic crystal for achieving broadband optical isolation |
| CN103472598A (en) * | 2013-10-12 | 2013-12-25 | 太原理工大学 | One-dimensional magnetic photonic crystal for implementing optical isolation |
| CN104483764A (en) * | 2014-11-11 | 2015-04-01 | 江苏大学 | Defective magneto photon crystal with non-reciprocity feature and purpose |
Non-Patent Citations (4)
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| HUI YUAN DONG等: "One-way optical tunneling induced by nonreciprocal dispersion of Tamm states in magnetophotonic crystals", 《OPTICS LETTERS》 * |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105739135A (en) * | 2016-03-25 | 2016-07-06 | 南京邮电大学 | Magneto-optic isolator prepared from metamaterial with low dielectric constant |
| CN105739135B (en) * | 2016-03-25 | 2018-04-10 | 南京邮电大学 | The magneto optic isolator prepared using low-k Meta Materials |
| CN106200025A (en) * | 2016-08-31 | 2016-12-07 | 欧阳征标 | Non-leakage magnetic luminescent material void fraction wave magnetic conduction surface fast wave optical diode |
| CN108538933A (en) * | 2018-05-11 | 2018-09-14 | 南京工业大学 | Magneto-optical material microstructure photovoltaic radiator with nonreciprocity |
| CN108649304A (en) * | 2018-07-03 | 2018-10-12 | 南京林业大学 | A kind of electromagnetic wave isolator based on magnet-optical medium |
| CN108649304B (en) * | 2018-07-03 | 2024-05-10 | 南京林业大学 | Electromagnetic wave isolator based on magneto-optical medium |
| US11092826B2 (en) | 2019-08-30 | 2021-08-17 | International Business Machines Corporation | Magneto-optical waveguide device and coupling methods |
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Application publication date: 20151125 |
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