CN105353462A - Photonic crystal filter with reflection cavity - Google Patents
Photonic crystal filter with reflection cavity Download PDFInfo
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- CN105353462A CN105353462A CN201510931437.1A CN201510931437A CN105353462A CN 105353462 A CN105353462 A CN 105353462A CN 201510931437 A CN201510931437 A CN 201510931437A CN 105353462 A CN105353462 A CN 105353462A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/122—Basic optical elements, e.g. light-guiding paths
- G02B6/1225—Basic optical elements, e.g. light-guiding paths comprising photonic band-gap structures or photonic lattices
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Abstract
A photonic crystal filter with a reflection cavity comprises a two-dimensional photonic crystal. A row of horizontal dielectric cylinders in the photonic crystal is removed, and a horizontal waveguide is guide; a row of vertical dielectric cylinders, from the center of the horizontal waveguide, is removed, a vertical waveguide is formed, and the vertical waveguide is a vertical output waveguide; the part, arranged at one side of the intersection position between the vertical waveguide and the horizontal waveguide, of the horizontal waveguide is a horizontal input waveguide; the part, arranged at the other side of the intersection position between the vertical waveguide and the horizontal waveguide, of the horizontal waveguide is a horizontal output waveguide; a defect cavity is arranged at the position, close to the horizontal input waveguide, in the vertical output waveguide; the reflection cavity is arranged at the position, adjacent to the vertical output waveguide, in the horizontal output waveguide; and the reflection cavity and the defect cavity respectively comprises five dielectric cylinders which are arranged in sequence. By adjusting the radiuses of central dielectric cylinders of the defect cavity and the reflection cavity, the scattering loss of the waveguides and the micro cavities are reduced, the filter is enable to achieve an optimal filtering effect, the transmission rate is high, and a Q value is also high.
Description
Technical field
The present invention relates to a kind of photon crystal filter.
Background technology
Photonic crystal is a kind of artificial micro-structure material of differing dielectric constant periodically being arranged formation, its fundamental characteristics is photon band gap, the light wave that frequency drops in forbidden band cannot be propagated, another characteristic is photon local, break the periodic structure of photonic crystal, introduce some defect, the light wave matched with defect frequency will by local in defect, due to the good characteristic of photonic crystal and it can control the propagation of light, advantage that structural compactness is good in very little dimensional space, photonic crystal is that people's designing filter provides strong instrument.
Photon crystal micro cavity is the point defect destroying photonic crystal periodic structure, microcavity frequency is positioned at photonic band gap, light is entered microcavity by Complete Bind, the quality factor of microcavity can be very high in theory, by regulating the structure and parameter of microcavity, can change resonance frequency and the pattern of microcavity, therefore microcavity is a desirable filtering device.
Chalcogenide glass a kind ofly adds the obtained optical material of other element based on elements such as sulphur, selenium, telluriums, and its response time is ultrafast, and the response time is less than 100fs, and wherein luminous effect is less than 50fs, and nonlinear factor is high, third-order nonlinear optical coefficient n
2more much bigger than general oxide glass, be silica-based 100-1000 times.This kind of glass breach Conventional optical communication the not high enough quartz glass of widely used nonlinear factor, miniaturization and the high-performance of optical device can be realized.In addition, chalcogenide glass or a kind of excellent infrared optical material, have wider infrared through spectrum, different according to composition, it is not through scope from 0.5um ~ 25um etc., comprise whole near infrareds and most of mid infrared region through wave band, this is that the photon crystal filter of subsequent design near infrared and mid infrared region provides possibility.
Summary of the invention
Technical matters to be solved by this invention is the photon crystal filter with reflection cavity that a kind of transmitance is high, Q value is also high.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of photon crystal filter with reflection cavity, comprise the 2 D photon crystal that multiple dielectric posts is formed, it is characterized in that: the dielectric posts removing a row of horizontal in this 2 D photon crystal forms horizontal waveguide, and from the center of this horizontal waveguide, upwards remove the vertical dielectric posts of a row form vertical waveguide, this vertical waveguide is vertical output waveguide, the horizontal waveguide of the side of this vertical waveguide and horizontal waveguide intersection location is horizontal input waveguide, the horizontal waveguide of the opposite side of this vertical waveguide and horizontal waveguide intersection location is horizontal output waveguide, defect cavity is positioned at vertical output waveguide near the position adjacent with horizontal input waveguide, reflection cavity is positioned at the horizontal output waveguide position adjacent with this vertical output waveguide, described reflection cavity and defect cavity include five dielectric posts be arranged in order, the radius being wherein positioned at other four dielectric posts of radius ratio of the central medium post at center is large, other four dielectric posts are positioned at the both sides of central medium post respectively between two.
Preferably, described 2 D photon crystal is tetragonal photonic crystal, and the dielectric posts radius of tetragonal photonic crystal is 0.21a, a is grating constant, and the dielectric posts of tetragonal photonic crystal is chalcogenide glass matrix, and background is air.
Preferably, the radius of the central medium post in described defect cavity is 0.35a, and the radius of other four dielectric posts is 0.21a, and the radius of the central medium post in described reflection cavity is 0.4a, and the radius of other four dielectric posts is 0.21a.
Preferably, the grating constant a=620nm of described tetragonal photonic crystal.
Compared with prior art, the invention has the advantages that the central medium column radius by regulating defect cavity and reflection cavity, reduce the scattering loss of waveguide and microcavity, make this wave filter reach optimum filtering effect at needs wave band, transmitance is high, and Q value is also high.
Accompanying drawing explanation
Fig. 1 is the structural representation of the photon crystal filter with reflection cavity of the embodiment of the present invention.
Fig. 2 is the band gap width of the photon crystal filter of the embodiment of the present invention and the variation relation figure of dielectric posts radius.
Fig. 3 is the band gap distribution plan of perfect photonic crystal TM mould.
Fig. 4 is the photon crystal wave-guide dispersion map with a waveguide adopting plane wave expansion method emulation, and wherein X-axis represents wave vector, and Y-axis represents normalized frequency.
When Fig. 5 a is the high bass wave of input 1550nm single wavelength, the stable state field intensity map of the photon crystal filter in no reflection events chamber, when Fig. 5 b is the high bass wave of input 1550nm single wavelength, has the stable state field intensity map of the photon crystal filter of reflection cavity.
Fig. 6 be adopt Finite-Difference Time-Domain Method emulation correspond to photon crystal filter in Fig. 5 a, 5b through figure, wherein dotted lines is the H103 resin of the photon crystal filter in no reflection events chamber, dotted line be the H103 resin of the photon crystal filter having reflection cavity.
Fig. 7 is the time domain steady-state response figure of the photon crystal filter containing reflection cavity in corresponding diagram 6.
Embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Fig. 1 is the photon crystal filter structure with reflection cavity of the embodiment of the present invention, comprise 2 D photon crystal 1, preferably, for tetragonal photonic crystal, this 2 D photon crystal 1 has horizontal input waveguide A, horizontal output waveguide B and vertical output waveguide C, this horizontal input waveguide A and horizontal output waveguide B is that the dielectric posts removing a row of horizontal in tetragonal photonic crystal forms horizontal waveguide and then formation, and this vertical output waveguide C upwards removes the vertical horizontal media post of a row to be formed from the center of horizontal waveguide in tetragonal photonic crystal.Namely the dielectric posts removing a row of horizontal in this tetragonal photonic crystal forms horizontal waveguide, the dielectric posts formation vertical waveguide vertical with upwards removing a row from the middle of this horizontal waveguide, this row's vertical waveguide removed is vertical output waveguide C, the side of the waveguide intersection location of vertical output waveguide C and level is horizontal input waveguide A, and opposite side is horizontal output waveguide B.This defect cavity 2 is positioned at the vertical output waveguide C position adjacent with horizontal input waveguide A, and it is adjacent with this vertical output waveguide C that this reflection cavity 3 is positioned at horizontal output waveguide B.
Wherein the grating constant of tetragonal photonic crystal is a=620nm, be along X-Z plane be square periodic distribution dielectric posts photonic crystal, dielectric posts radius r=0.21a, dielectric posts is Ge
33sb
10se
57chalcogenide glass matrix, refractive index is n=2.65, and the third-order non-linear specific refractivity near 1550nm is 1.3 × 10
-17m
2/ W, non-linear absorption coefficient is 1.6 × 10
-12m/W, it is non-linear is 590 times of quartz material.Background is air, and refractive index is 1.Defect cavity 2 is positioned at the intersection that vertical output waveguide C closes on horizontal input waveguide A and vertical output waveguide C, and reflection cavity 3 is positioned at the intersection that horizontal output waveguide B closes on horizontal input waveguide A and horizontal output waveguide B.Defect cavity 2 and reflection cavity 3 are formed by the dielectric posts that 5 are arranged in a line, and comprise and be positioned at central medium post, all the other 4 is normal media post, is positioned at central medium post both sides respectively between two.Wherein the central medium column radius of defect cavity 2 is 0.35a, and all the other four dielectric posts radiuses are 0.21a.In 5 dielectric posts of reflection cavity 3, central medium column radius is 0.4a, and all the other four dielectric posts radiuses are 0.21a.Horizontal input waveguide A, horizontal output waveguide B and vertical output waveguide C are vertical relation, and flashlight inputs from horizontal input waveguide A side, export from vertical output waveguide B.And the position of the dielectric posts in the position of the dielectric posts of this defect cavity 2 and reflection cavity 3 and photonic crystal matches, and all correspondingly aligns with the center of the dielectric posts in tetragonal photonic crystal in the center of the dielectric posts namely in defect cavity, reflection cavity.Namely the center of dielectric posts is not moved.
Technical scheme of the present invention is the Local Characteristic of photon band gap characteristic and the photon crystal micro cavity had based on 2 D photon crystal, realizes the function of photon crystal filter filtering.The ultimate principle of above-mentioned photon crystal filter is: 2 D photon crystal provides one to have wider photon band gap, and the light wave that wavelength drops in this photon band gap cannot be propagated in this photonic crystal.As shown in Figure 2, be under TM pattern, the dielectric posts radius of Two dimensional square lattice photonic crystal and the relation of band gap width carry out the band gap distribution plan that scanning probe obtains, and when dielectric posts radius is less than 0.11a or is greater than 0.42a, photonic crystal does not have band gap; When dielectric posts radius is from 0.11a, the width of photonic band gap increases along with the increase of radius, when dielectric posts radius increases to 0.21a, band gap width reaches maximum, the normalized frequency (a/ λ) of maximum band gap is 0.352-0.449, after this, along with the increase of dielectric posts radius, band gap width reduces gradually, when dielectric posts radius is greater than 0.42a, band gap disappears, thus, photonic crystal dielectric posts radius size when the present invention selects band gap width maximum is 0.21a.The band gap diagram of perfect photonic crystal when be dielectric posts radius shown in Fig. 3 being 0.21a, oblique line portion is photon band gap, and corresponding normalized frequency a/ λ=ω a/2 π c, wherein λ is the wavelength in vacuum, and ω is the angular frequency of light, and c is the light velocity in vacuum.This structure has two parts band gap, narrower band gap normalized frequency (a/ λ) is 0.81-0.82, this band gap width is too narrow, introduce defect mode more difficult, so mainly consider the band gap that width is wider below, corresponding normalized frequency (a/ λ) is 0.352-0.449, and center normalized frequency is 0.4, consistent with the result in Fig. 2.
By inlead defect, the effect of line defect is equivalent to waveguide, namely in photon band gap, certain defect state is introduced, the light wave meeting defect frequency can be propagated in this waveguide, Fig. 4 is the waveguide dispersion figure containing photonic crystal during a waveguide, and normalized frequency 0.4 place's waveguide exists a pattern, for obtaining resonance wavelength at 1550nm, according to formula f=a/ λ, we select photonic crystal lattice constant a=620nm.The present invention devises as the defect cavity 2 in Fig. 1 and reflection cavity 3, and the photon meeting microcavity resonance frequency will be entered microcavity position by local, and described photon crystal micro cavity has very high quality factor, can store the energy of the light wave meeting resonance frequency well.Groundwork of the present invention is the central medium column radius regulating defect cavity, to make resonance wavelength at 1550nm, and defect cavity coupling efficiency is high, through a series of simulation calculation, when center dielectric posts radius is 0.35a, when all the other four dielectric posts radiuses are 0.21a, the resonance wavelength of this defect cavity is 1550nm and coupling efficiency is higher, meets the designing requirement of wave filter.
Horizontal output waveguide is blocked by design reflectivity chamber 3, in the hope of strengthening defect cavity 2 to the coupling efficiency of light, reduce the loss in filtering, thus improve Q value and the filtering performance of defect cavity, ideally reflection cavity can reflect ripples all except himself resonance wavelength, through the ripple of its resonance wavelength, the inside of the reflection cavity 3 of design is made up of 5 dielectric posts, the central medium column radius in accommodation reflex chamber 3, through a series of simulation calculation, obtain when center dielectric posts radius is 0.4a, when central medium post both sides are respectively containing two normal media posts, namely when the resonance wavelength of reflection cavity is 1700nm, the loss of light wave can not be caused, the best performance of this wave filter.One flashlight is set at the outboard end place of horizontal input waveguide A, one monitor is set at the outboard end place of vertical output waveguide C.Described flashlight inputs from horizontal input waveguide A with high bass wave form, coupling is there is with defect cavity 2 in vertical output waveguide C, when light wave arrives defect cavity 2, due to the local frequency-selecting effect of microcavity, only meeting this defect cavity resonance wavelength is that the light wave of 1550nm could resonate, be coupled into defect cavity 2, and export from vertical output waveguide C.
Fig. 5 a is field intensity map when not reaching stable state containing the wave filter of reflection cavity 3, and Fig. 5 b is wave filter containing reflection cavity 3 field intensity map when reaching stable state.Fig. 6 be correspond to Fig. 5 through figure, respectively illustrate the transmitance that there is reflection cavity and not there is reflection cavity.As shown in Fig. 5 a, 5b, 6, the filtering of the light wave being 1550nm should be achieved to wavelength with the photon crystal filter of reflection cavity, when the transmitance containing photon crystal filter during reflection cavity 3 is 0.98; When not containing reflection cavity 3, when namely reflection cavity 3 place is a waveguide, the transmitance of photon crystal filter is lower than 0.3, and horizontal output waveguide blocked by reflection cavity 3, makes most of light wave be reflected back toward horizontal input waveguide.According in Fig. 6 containing reflection cavity photon crystal filter through shown in figure, according to formula Q=λ/Δ λ, wherein λ is the centre wavelength of resonant mode, Δ λ is the half-peak band width of resonant mode, calculate the quality factor of defect cavity, the Q value that can be calculated this defect cavity reaches 7500, and description defect chamber has good storage capacity.Fig. 7 is for corresponding to Fig. 5 (b), and namely have the time domain steady-state response figure of the photon crystal filter of reflection cavity 3, the vertical output end again demonstrating the photon crystal filter containing reflection cavity has very high transmitance.
The present invention is in order to adapt to the development of communication band, and the wave filter carried is operated in 1550nm wavelength, has actual application value.And the photon crystal filter in the embodiment of the present invention, by regulating the central medium column radius of defect cavity and reflection cavity, reduce the scattering loss of waveguide and microcavity, make this wave filter reach optimum filtering effect, transmitance is high, and Q value is also high.
Claims (4)
1. the photon crystal filter with reflection cavity, comprise the 2 D photon crystal (1) that multiple dielectric posts is formed, it is characterized in that: the dielectric posts removing a row of horizontal in this 2 D photon crystal forms horizontal waveguide, and from the center of this horizontal waveguide, upwards remove the vertical dielectric posts of a row form vertical waveguide, this vertical waveguide is vertical output waveguide (C), the horizontal waveguide of the side of this vertical waveguide and horizontal waveguide intersection location is horizontal input waveguide (A), the horizontal waveguide of the opposite side of this vertical waveguide and horizontal waveguide intersection location is horizontal output waveguide (B), defect cavity (2) is positioned at vertical output waveguide (C) near the position adjacent with horizontal input waveguide (A), reflection cavity (3) is positioned at horizontal output waveguide (B) position adjacent with this vertical output waveguide (C), described reflection cavity (3) and defect cavity (2) include five dielectric posts be arranged in order, the radius being wherein positioned at other four dielectric posts of radius ratio of the central medium post at center is large, other four dielectric posts are positioned at the both sides of central medium post respectively between two.
2. as claimed in claim 1 with the photon crystal filter of reflection cavity, it is characterized in that: described 2 D photon crystal (1) is tetragonal photonic crystal, and the dielectric posts radius of tetragonal photonic crystal is 0.21a, a is grating constant, the dielectric posts of tetragonal photonic crystal is chalcogenide glass matrix, and background is air.
3. as claimed in claim 2 with the photon crystal filter of reflection cavity, it is characterized in that: the radius of the central medium post in described defect cavity (2) is 0.35a, the radius of other four dielectric posts is 0.21a, the radius of the central medium post in described reflection cavity (3) is 0.4a, and the radius of other four dielectric posts is 0.21a.
4., as claimed in claim 3 with the photon crystal filter of reflection cavity, it is characterized in that: the grating constant a=620nm of described tetragonal photonic crystal.
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Cited By (7)
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| CN108535197A (en) * | 2018-04-24 | 2018-09-14 | 南京信息工程大学 | A kind of detection device and method of miniature ethanol solution concentration |
| CN109669239A (en) * | 2019-01-04 | 2019-04-23 | 深圳大学 | A kind of orthogonal division Mode interference FANO resonant structure of photonic crystal waveguide |
| CN109669240A (en) * | 2019-01-04 | 2019-04-23 | 深圳大学 | A kind of photonic crystal waveguide sextupole division Mode interference FANO resonant structure |
| CN109828329A (en) * | 2019-01-30 | 2019-05-31 | 广西师范大学 | Photon crystal filter with tangent bend L shape microcavity |
| CN112346173A (en) * | 2020-11-05 | 2021-02-09 | 安徽熙泰智能科技有限公司 | Dielectric column photonic crystal optical waveguide turning grating structure and near-to-eye display system |
| CN112925058A (en) * | 2021-01-22 | 2021-06-08 | 中山大学 | Photonic crystal narrow-band filter based on zero-dimensional topological angular state |
| CN114325935A (en) * | 2021-12-08 | 2022-04-12 | 南京邮电大学 | Non-reciprocal double-channel narrow-band filter of non-magnetic photonic crystal |
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| CN103196866A (en) * | 2013-03-13 | 2013-07-10 | 上海理工大学 | Gas refractive index detector based on two-dimensional photonic crystal |
| CN103472532A (en) * | 2013-09-13 | 2013-12-25 | 深圳大学 | Photonic crystal all-optical tunable filter |
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| US20030161577A1 (en) * | 2002-02-27 | 2003-08-28 | Wilson Carol J. | Continuously tunable photonic crystal drop filter |
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| CN108535197A (en) * | 2018-04-24 | 2018-09-14 | 南京信息工程大学 | A kind of detection device and method of miniature ethanol solution concentration |
| CN109669239A (en) * | 2019-01-04 | 2019-04-23 | 深圳大学 | A kind of orthogonal division Mode interference FANO resonant structure of photonic crystal waveguide |
| CN109669240A (en) * | 2019-01-04 | 2019-04-23 | 深圳大学 | A kind of photonic crystal waveguide sextupole division Mode interference FANO resonant structure |
| CN109669240B (en) * | 2019-01-04 | 2020-10-02 | 深圳大学 | Photonic crystal waveguide hexapole splitting mode interference FANO resonance structure |
| CN109669239B (en) * | 2019-01-04 | 2020-10-02 | 深圳大学 | Orthogonal splitting mode interference FANO resonance structure of photonic crystal waveguide |
| CN109828329A (en) * | 2019-01-30 | 2019-05-31 | 广西师范大学 | Photon crystal filter with tangent bend L shape microcavity |
| CN109828329B (en) * | 2019-01-30 | 2024-03-01 | 广西师范大学 | Photonic crystal filter with double-bending L-shaped microcavity |
| CN112346173A (en) * | 2020-11-05 | 2021-02-09 | 安徽熙泰智能科技有限公司 | Dielectric column photonic crystal optical waveguide turning grating structure and near-to-eye display system |
| CN112925058A (en) * | 2021-01-22 | 2021-06-08 | 中山大学 | Photonic crystal narrow-band filter based on zero-dimensional topological angular state |
| CN112925058B (en) * | 2021-01-22 | 2022-03-04 | 中山大学 | Photonic crystal narrow-band filter based on zero-dimensional topological angular state |
| CN114325935A (en) * | 2021-12-08 | 2022-04-12 | 南京邮电大学 | Non-reciprocal double-channel narrow-band filter of non-magnetic photonic crystal |
| CN114325935B (en) * | 2021-12-08 | 2024-04-16 | 南京邮电大学 | Non-magnetic photon crystal non-reciprocal double-channel narrow-band filter |
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