CN208569082U - A kind of mixing phasmon waveguide bragg grating Polarization filter - Google Patents
A kind of mixing phasmon waveguide bragg grating Polarization filter Download PDFInfo
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- CN208569082U CN208569082U CN201721710662.3U CN201721710662U CN208569082U CN 208569082 U CN208569082 U CN 208569082U CN 201721710662 U CN201721710662 U CN 201721710662U CN 208569082 U CN208569082 U CN 208569082U
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Abstract
The utility model discloses a kind of mixing phasmon waveguide bragg grating Polarization filter containing admittance mating structure, the mixing phasmon waveguide bragg grating Polarization filter includes the low refractive index dielectric layer of Si layers and Ag layers and Si layers Ag layers of metal, high-index material central filler.A kind of mixing phasmon waveguide bragg grating matched filter containing admittance mating structure of the utility model, structure is simple, can be realized near the forbidden band 1550nm TM mode within the scope of broadband by the transmission with TE mode, and the transmission spectrum optimization of low frequency pass band, high frequency pass band and forbidden band frequency range may be implemented.
Description
Technical field
The utility model belongs to the artificial micro-structure material for fields such as optic communication, integrated optics, more particularly to a kind of
Mixing phasmon waveguide bragg grating Polarization filter containing admittance mating structure.
Background technique
People have been developed a variety of nanometer optical wave guide structures and have been wanted to meet the high integration in integrated photonic device field in recent years
It asks, such as photonic crystal waveguide, phasmon waveguide.Wherein, scale of the surface plasmon waveguide because of its breakthrough diffraction limit
The material property integrated with photoelectricity is by extensive concern.However the loss of metal bring leads to the transmission range very little of waveguide mode,
Limit the application of surface plasmon waveguide and waveguide devices.In recent years, loss can be effectively reduced and increase transmission distance
From mixing phasmon waveguiding structure be concerned.Mix phasmon waveguide (hybrid plasmonic
Waveguides, HPWs) key point be exactly low index gap is introduced between metal and high refractive index medium so that waveguide
Structure can obtain preferable compromise between the low-loss of Medium Wave Guide and the schema constraint ability of surface plasmon waveguide.
Thus the various integrated photonic devices based on HPWs are devised, such as surface phasmon nano lens, efficient optics
Modulator, light beam device etc..
Wherein, the photonic device Bragg grating relied on as wavelength, in conjunction with HPWs structure with outstanding filtering characteristic and
Low loss characteristic has attracted the research of many scholars.Jiansheng Liu et al. people devises a kind of nanostructure based on HPWs
Grating (Xiao J, Liu J, Zheng Z, et al.Design and analysis of a nanostructure
grating based on a hybrid plasmonic slot waveguide[J].Journal of Optics,2011,
13 (10): 105001.), it may be used as the broadband filter of TM mode.Daoxin Dai et al. is also devised using HPWs
A kind of structure is simple, function admirable ultra wide bandwidth band TM leads to polarizer (Guan X, Xu P, Shi Y, et al.Ultra-
compact Broadband TM-pass Polarizer Using a Silicon Hybrid Plasmonic
Waveguide Grating[C]//Asia Communications and Photonics Conference.2013.).Value
It is noted that the transmission spectrum of optical grating construction is constantly present apparent concussion when frequency is in passband position, this is to some
It is unfavorable for the not high detector of sensitivity.It has been investigated how reducing transmission spectrum oscillation and improving the same of transmitance
When keep filtering superperformance be significantly.
Utility model content
The purpose of this utility model is in view of the drawbacks of the prior art, to provide a kind of mixing etc. containing admittance mating structure
From excimer waveguide bragg grating Polarization filter, structure is simple, is able to achieve broadband near central wavelength 1550nm
The filter action of TM mode, and can the transmission spectrum as needed to low frequency pass band, high frequency pass band and forbidden band optimization is adjusted.
To achieve the goals above, the utility model uses following technical scheme: a kind of mixed containing admittance mating structure
Close phasmon waveguide bragg grating Polarization filter, the mixing phasmon waveguide bragg grating Polarization filter
Low refractive index dielectric layer including Si layers and Ag layers and Si layers Ag layers of metal, high-index material central filler.
Further, metal Ag layers with a thickness of 100nm, and Si layers of high-index material with a thickness of 230nm, low refractive index dielectric
Layer is with a thickness of 50nm.
Further, low-index layer includes the admittance Matching band at both ends and the bragg structure area of centre.
Further, bragg structure area is alternately arranged by two kinds of low-index materials in periodic structure, the admittance
Matching band uses a kind of low-index material, and the low-index material is TiO2And SiO.
Further, it is 320nm, a week that two kinds of low-index materials, which are alternately arranged cycle length, in bragg structure area
The duty ratio of interim two kinds of materials is 0.5:0.5, periodicity 10.5；Admittance Matching band is located at grating both ends, by low folding of the same race
The filling of rate material is penetrated, the length of admittance Matching band is 80nm or 210nm.
Further, the length of two kinds of low-index materials is according to Bragg's condition of reflection at incident wavelength 1550nm
It finds out.
Further, mixing phasmon waveguide bragg grating can be realized within the scope of the broadband of forbidden band 1550nm
TM mode by the transmission with TE mode.
A kind of mixing phasmon waveguide bragg grating Polarization filter containing admittance mating structure, is by metal strip
Ag and high-index material Si and its intercycle replace filled media TiO2(n=2.52) and SiO2(n=1.46) it constitutes.Its
Middle low-index layer is different according to the set-up mode of length, is divided into bragg structure area and admittance Matching band.
Mixing phasmon waveguide bragg grating matched filter containing admittance mating structure, the matching positioned at both ends
The low refractive material in area uses same material, and two kinds of low-index materials are arranged in periodically alternating in internal bragg structure area
Column, cycle length Λ is according to Bragg's condition of reflection q λ/2=nneff,1dB+nneff,2(Λ-dB) obtain, incident wavelength λ=
1550nm is found out.Wherein, q is the series of Bragg reflection, usually takes 1.The effective folding of two kinds of low-index materials in the waveguide
The rate of penetrating is respectively nneff,1And nneff,2, and the duty ratio of two kinds of materials is 0.5:0.5 in a cycle.Medium is alternately arranged the period
Length is 320nm, and the accounting of two media is 1:1, and periodicity 10.5, the i.e. rear and front end of waveguide are low-refraction material of the same race
Material.
Mixing phasmon waveguide bragg grating matched filter containing admittance mating structure, by changing admittance
The structure size of Matching band so that transmission spectrum the two sides of forbidden band concussion (this is also the characteristic of multi-layer grating structure) reduce and
It can be improved the transmitance of passband.It using admittance matching principle, is modulated by the length to matching of waveguide area, so that it is led
Value of receiving reaches a specific optimal value Yop=Xop+iZop.The optimal value is outermost by the bragg structure area of calculating
What admittance was realized.In the ambient refractive index n that setting is extraneoussubUnder the conditions of=1, by adjusting matching layer length dMSo that matching layer
Admittance YMNumerical value level off to Yop, that is, realize admittance matching, then realize to TM mode low-frequency passband, high frequency pass band and taboo
Transmission spectrum optimization with frequency range.
The beneficial effects of the utility model are: a kind of mixing phasmon containing admittance mating structure of the utility model
Waveguide bragg grating matched filter, structure is simple, can be realized near the forbidden band 1550nm TM mode within the scope of broadband
By the transmission with TE mode, and may be implemented low frequency pass band, high frequency pass band and forbidden band frequency range transmission spectrum optimization.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the HPWBG of embodiment.
Fig. 2 is the transmission spectrum of embodiment incident light vertical incidence HPWBG from air, and (a)-(c) is respectively dMIt is equal to
The transmission spectrum of TE and TM mode when 160nm, 80nm and 210nm.
Specific embodiment
It elaborates below with reference to embodiment and attached drawing to the utility model, the present embodiment is with the utility model technology
Implemented under premised on scheme, the detailed implementation method and specific operation process are given, but the protection of the utility model
Range is not limited to the following embodiments.
It is as shown in Figure 1 the knot of the mixing phasmon waveguide bragg grating matched filter containing admittance mating structure
Structure schematic diagram.Low-index material SiO is alternately arranged between Ag layers of metal and Si layers of high refractive index medium2And TiO2.Wherein low folding
It is different according to the set-up mode of length to penetrate rate layer, is divided into bragg structure area and admittance Matching band.Setting is each in the present embodiment
Parameter is as follows: hSi=230nm, hl=50nm, wSi=400nm, wm=hm=100nm, dB=Λ/2=160nm, periodicity N=
10.5, i.e. the rear and front end of waveguide is low-index material TiO of the same race2。
Fig. 2 is the transmission spectrum for the HPWBG that incident light vertical incidence from air contains admittance mating structure.Fig. 2 (a)-(c)
Respectively admittance length dMThe transmission spectrum of TE and TM mode when equal to 160nm, 80nm and 210nm.In conjunction with being provided not in table 1
For admittance value Y under same frequency as it can be seen that under TE mode, transmission spectrum is similar to straight wave guide, dMInfluence of the change to its transmission spectrum
It is smaller, and with the reduction of incident frequencies and by.Under TM mode, dMChange be affected to its transmission spectrum, work as dM=
dBWhen, YopAnd YMValue difference it is larger, at this time all there is apparent concussion in the passband transmission spectrum of forbidden band two sides, but when matching layer
Length dMAfter being modulated (when such as 80nm and 160nm), YopAnd YMDifference in low frequency pass band (such as 0.7eV) and high frequency pass band
The position (such as 0.9eV) all accordingly reduces, and transmission spectrum also obtains correspondingly smooth at this time and increases, it can by matching layer
Width modulated achievees the effect that optimize specific band transmission spectrum.
1 admittance value Y of table
Thus embodiment can be seen that the utility model proposes a kind of mixing phasmon containing admittance mating structure
Waveguide bragg grating matched filter.Its structure is simple, is able to achieve the broadband TM mode near central wavelength 1550nm
Filter action, by admittance matching to matching layer length be modulated then as needed to low frequency pass band, high frequency pass band and
Optimization is adjusted in the transmission spectrum of forbidden band.
Claims (7)
1. a kind of mixing phasmon waveguide bragg grating Polarization filter, it is characterised in that: the mixing phasmon
Waveguide bragg grating Polarization filter includes Ag layers of metal, Si layers and Ag layers of high-index material and Si layers of central filler
Low refractive index dielectric layer.
2. mixing phasmon waveguide bragg grating Polarization filter according to claim 1, it is characterised in that: described
Ag layers of metal with a thickness of 100nm, Si layers of high-index material with a thickness of 230nm, low refractive index dielectric layer is with a thickness of 50nm.
3. mixing phasmon waveguide bragg grating Polarization filter according to claim 2, it is characterised in that: described
Low-index layer includes the admittance Matching band at both ends and the bragg structure area of centre.
4. mixing phasmon waveguide bragg grating Polarization filter according to claim 3, it is characterised in that: described
Bragg structure area is alternately arranged by two kinds of low-index materials in periodic structure, and the admittance Matching band uses a kind of low folding
Rate material is penetrated, the low-index material is TiO2And SiO.
5. mixing phasmon waveguide bragg grating Polarization filter according to claim 4, it is characterised in that: described
It is 320nm that two kinds of low-index materials, which are alternately arranged cycle length, in bragg structure area, and two kinds of materials accounts in a cycle
Sky is than being 0.5:0.5, periodicity 10.5；Admittance Matching band is located at grating both ends, is filled by low-index material of the same race, admittance
The length of Matching band is 80nm or 210nm.
6. mixing phasmon waveguide bragg grating Polarization filter according to claim 5, it is characterised in that: described
The length of two kinds of low-index materials is found out at incident wavelength 1550nm according to Bragg's condition of reflection.
7. mixing phasmon waveguide bragg grating Polarization filter according to claim 1, it is characterised in that: described
Mixing phasmon waveguide bragg grating can be realized within the scope of the broadband of forbidden band 1550nm TM mode by and TE
The transmission of mode.
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| CN201721710662.3U CN208569082U (en) | 2017-12-08 | 2017-12-08 | A kind of mixing phasmon waveguide bragg grating Polarization filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114384621A (en) * | 2022-02-11 | 2022-04-22 | 中国科学院上海技术物理研究所 | Angle-insensitive narrow-band filter based on dual plasmon resonance |
| CN114660714A (en) * | 2022-03-15 | 2022-06-24 | 南京邮电大学 | TM passes polarization filter |
| CN117075256A (en) * | 2023-10-16 | 2023-11-17 | 潍坊先进光电芯片研究院 | Mixed plasmon waveguide Bragg grating polarizer with staggered gratings |
-
2017
- 2017-12-08 CN CN201721710662.3U patent/CN208569082U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114384621A (en) * | 2022-02-11 | 2022-04-22 | 中国科学院上海技术物理研究所 | Angle-insensitive narrow-band filter based on dual plasmon resonance |
| CN114384621B (en) * | 2022-02-11 | 2023-07-04 | 中国科学院上海技术物理研究所 | Angle insensitive narrow-band filter based on double plasmon resonance |
| CN114660714A (en) * | 2022-03-15 | 2022-06-24 | 南京邮电大学 | TM passes polarization filter |
| CN114660714B (en) * | 2022-03-15 | 2024-05-10 | 南京邮电大学 | TM (transverse magnetic) pass polarization filter |
| CN117075256A (en) * | 2023-10-16 | 2023-11-17 | 潍坊先进光电芯片研究院 | Mixed plasmon waveguide Bragg grating polarizer with staggered gratings |
| CN117075256B (en) * | 2023-10-16 | 2024-02-13 | 潍坊先进光电芯片研究院 | Mixed plasmon waveguide Bragg grating polarizer with staggered gratings |
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