CN101866089A - Method for realizing optical switch by utilizing photonic crystal panel to conduct formant displacement - Google Patents
Method for realizing optical switch by utilizing photonic crystal panel to conduct formant displacement Download PDFInfo
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- CN101866089A CN101866089A CN 201010183398 CN201010183398A CN101866089A CN 101866089 A CN101866089 A CN 101866089A CN 201010183398 CN201010183398 CN 201010183398 CN 201010183398 A CN201010183398 A CN 201010183398A CN 101866089 A CN101866089 A CN 101866089A
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Abstract
The invention discloses a method for realizing an optical switch by utilizing a photonic crystal panel to conduct formant displacement, comprising: manufacturing a photonic crystal panel based on an indium phosphide material; building an optical switch experiment light path system which comprises a signal light source; incident light sent by the signal light source and located on the 1550 nm wave band is divided into two parts, wherein one part is irradiated onto the photonic crystal panel structure located on a rotary angle specimen stage by a focusing lens, collected transmission light by a photodiode, and is extracted to useful signals by a first filter; the other light beam is directly collected by the photodiode and a second filter; analyzing the signals extracted by the first filter and the second filter via the computer; irradiating pump light emitted by a pumping light source onto the photonic crystal panel structure to cause the nonlinear refractive index variation of the photonic crystal panel structure, and causing a transmission spectrum to change so as to realize the optical switch.
Description
Technical field
The present invention relates to optical nonlinearity, photonic crystal photoswitch, full optical communication technology field, particularly a kind ofly utilize the photonic crystal panel nonlinear refractive index to change to cause that the conduction resonance peak displacement that sees through on the spectrum realizes the method for photoswitch.
Background technology
All-optical switch optical communication, light is integrated and the all-optical network field in important effect is arranged.In the last few years, utilized photonic crystal to realize that the research of all-optical switch is day by day deep.P.Tran etc. propose in Opt.Lett.21:1138-1140, if when utilizing pump light and flashlight all to be positioned at photon band gap, under the situation of no pump light, flashlight can not pass through photonic crystal; But under the excitation of pump light, itself and frequently or difference frequency light can be arranged in the conduction band of photon band gap, can pass through photonic crystal.The photoswitch that utilizes the mixing principle to make, except with the photon crystal device level, also relevant with the parameters of mixing light path, as optical coupling efficiency etc.
Alain Hach é etc. are by two-photon absorption and Kerr non-linear phenomena in the research 1-D photon crystal, and proposition can utilize the band edge of photonic crystal to move effect and produce all-optical switch.The photoswitch that utilizes the band edge effect to make, because the band edge GVD (Group Velocity Dispersion) is very big, and is difficult to produce the very steep photonic crystal of band edge on the technology, so switch efficiency is not high.Shanhui Fan etc. has adopted the defective mould of an adjustable microcavity of single mode to move and has realized photoswitch.The microcavity quality factor that people such as Shanhui Fan adopt has only 1300, and transmitance only is 65% during the resonance of defective mould position, and light switch function realizes that required minimum refractive index is changed to 3 * 10-3.One of measurements such as Shin-ichiro Inoue have the nonlinear 2 D photon crystal waveguiding structure of Kerr angle reflectance spectrum, and this structure is at 1.6GW/cm
2Power density under, the resonance angle can change 0.06 °/0.3 °.The polystyrene of human doping C153 such as QIHUANG GONG prepares 2 D photon crystal microcavity photoswitch, resonance peak displacement 3.7nm when pump energy is 520fJ.
Summary of the invention
(1) technical matters that will solve
In view of this, fundamental purpose of the present invention is to provide the method for utilizing the displacement of photonic crystal panel conduction resonance peak to realize photoswitch, upward conduct the relation of resonance peak and photonic crystal parameters, band structure by making clear of spectrum, obtained the conduction resonance mode that some quality factors are very high, refractive index changes sensitivity.Pump light and flashlight reduce pump power greatly with the coupling meeting of conduction resonance mode respectively, and simultaneously, because pump light and flashlight can be along perpendicular to photonic crystal or incidents at a certain angle, the light wave coupling is more convenient, helps practical application.
(2) technical scheme
For achieving the above object, the invention provides a kind of method of utilizing the displacement of photonic crystal panel conduction resonance peak to realize photoswitch, comprising:
Step 1: make a photonic crystal panel structure 13 based on indium phosphide;
Step 2: build photoswitch experiment light path system, this light path system comprises: a signal optical source 10, the incident light that is positioned at the 1550nm wave band that is sent by signal optical source 10 is divided into two parts by spectroscope 11, wherein a part shines photonic crystal panel structure 13 on the sample stage that is seated in angle rotatable via condenser lens 12, and by photodiode 14 collection transmitted lights, first wave filter 15 carries out useful signal and extracts; Another bundle light is then directly collected by the photodiode 16 and second wave filter 17; First wave filter 15 and second wave filter 17 signal that extracts are all analyzed by computing machine 19;
Step 3: the pump light that pump light source 18 is sent is radiated on the photonic crystal panel structure 13, causes the variation of photonic crystal panel structure 13 nonlinear refractive index, causes to see through to compose to change, thereby realizes photoswitch.
In the such scheme, described photonic crystal panel structure 13 is a tetragonal lattice crystal structure, and this structure has following parameter: grating constant is 800nm, and thickness is 240nm, and little pore radius is 80nm.
In the such scheme, described pump light source 18 is the laser instruments that are used for pumping, and its wavelength is tunable in the 800nm left and right sides, and repetition frequency is 1k Hz, and pulsewidth is psec or femtosecond magnitude.
In the such scheme, the described spectrum that sees through sees through spectrum for the wavelength of photonic crystal panel structure 13, or angle sees through spectrum.
In the such scheme, described pump light wavelength 800nm is positioned at through the last conduction of spectrum resonance peak and puts, pump light and photonic crystal panel structure 13 conduction resonance modes produce resonance coupling makes near the field intensity the photonic crystal panel structure 13 strengthen 5 times, thereby reduces pump energy.
In the such scheme, the spectrum that sees through of described photonic crystal panel structure 13 goes up conduction resonance peak quality factor up to 10
5, realize that the required minimum refractive index changes delta of photoswitch n is 2.5 * 10
-5RIU, required minimum pump energy is 184fJ.
In the such scheme, described photoswitch works near the 1550nm of communication band.
In the such scheme, described flashlight and pump light all are coupled into photonic crystal panel structure 13 perpendicular to photonic crystal panel structure 13 or incident at a certain angle, do not need strict end face coupling.
In the such scheme, described light shutter device is of a size of 100 μ m
2, adopt micro-processing method to realize easily.
(3) beneficial effect
The present invention makes pump light and flashlight all can be coupled with the conduction resonance mode that sees through on the spectrum by adjusting the photonic crystal panel parameter.Pump light and photonic crystal panel resonance mode produce coupling can strengthen light field greatly, thereby reduces the pump energy of realizing that switch closes; And its quality factor of conduction resonance mode that flashlight adopts is very high, nonlinear refractive index is changed also very sensitive, and therefore, for the light lower occasion of pump energy requirement of opening the light, the present invention can provide good application.
Description of drawings
Fig. 1 is a photoswitch experimental provision synoptic diagram of the present invention;
Fig. 2 is that the dull and stereotyped angle of 2 D photon crystal of the present invention sees through spectrum;
Fig. 3 is the dull and stereotyped relation that sees through spectrum resonance angle and pump energy of 2 D photon crystal of the present invention;
Fig. 4 is that the dull and stereotyped wavelength of 2 D photon crystal of the present invention sees through spectrum;
Fig. 5 is the dull and stereotyped relation that sees through spectrum conduction resonance peak position and pump energy of 2 D photon crystal of the present invention;
Fig. 6 is the dull and stereotyped photoswitch synoptic diagram of 2 D photon crystal of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Embodiment 1:
See also shown in Figure 1, the flashlight light source that the present invention adopts is that wavelength is the infrared laser of 1550nm, laser beam is divided into two bundles by spectroscope, a branch ofly be focused into the point that diameter is about 100 μ m by focus prism, be radiated at sample surfaces, the present invention collects transmitted light by photodiode, and passes through wave filter afterwards by the computer collection; Another bundle is then directly collected with photodiode, is connected with computer by wave filter, as the reference light of transmission signal light.Sample places on the sample stage of fine-tuning angle, and the present invention can adjust incident angle of light by the angle of inclination of regulating sample stage, thereby the angle that obtains the photonic crystal plate sees through spectrum.In the frame of broken lines is pump light light source of the present invention, the Ti sapphire laser, and wavelength is tunable in the 800nm left and right sides, and repetition frequency is 1k Hz, and pulsewidth is psec or femtosecond magnitude (being generally 2ps).When the present invention changes the incident power of pump light, sample stage is rotated to 90 ° of angles that obtain the photonic crystal plate from 0 ° see through spectrum, as shown in Figure 2.Can see on through spectrum two very dark resonance peaks that lay respectively at 18.16 ° and 27.34 ° positions being arranged, the resonance peak degree of depth is respectively 0.005 and 0.007, and the transmitance during resonance is less than 1%, and the halfwidth of resonance peak is respectively 0.02 ° and 0.025 °.The present invention chooses near the resonance mode of preaching higher 18.16 ° of nonlinear refractive index change sensitivity is realized photoswitch.As Fig. 3 is through the dependence of the resonance angle on the spectrum to pump energy.Along with the increase of pump energy, the resonance angle also can increase gradually.This resonance angle is about 80degree/RIU to the sensitivity that the caused nonlinear refractive index of pump light changes.
When the incident illumination of 1550nm is mapped on the photonic crystal, rotate incident angle, when reaching 18.16 ° of resonance angles, the transmitance of incident light becomes very low and approaches 0, the closed condition of corresponding photoswitch; Under the situation that does not change angle, increase the power of incident light, when pump energy during greater than 300fJ, because nonlinear interaction causes refraction index changing 2.5 * 10
-4RIU makes the resonance angle be subjected to displacement, and the low transmission of resonance angle position originally becomes high permeability, the opening that corresponding light opens the light.Both contrasts surpass 50%, and after pump energy was greater than 1pJ, contrast will be near 100%.
Embodiment 2:
See also shown in Figure 4ly, the wavelength of 2 D photon crystal plate saw through spectrum when the present invention calculated vertical incidence.In the drawings, can see that a resonance peak is arranged near wavelength 1550nm, its quality factor is up to 10
5, the sensitivity of conduction resonance peak position refractive index is 446nm/RIU.According to seeing through last two conditions that the peak can be differentiated of spectrum, obtain making seeing through spectrum and going up the conduction resonance peak and move the minimum refractive index that to differentiate and change An and should be about 3.47 * 10
-5RIU.As Fig. 5 is the variation of conduction resonance peak along with pump energy, as can be seen along with the increase of pump energy, the conduction resonance peak can move to the shortwave direction, this is because the third-order non-linear refractive index of indium phosphide is a negative value, when the incident light energy increases, can cause the refractive index of material to descend, see through the spectrum blue shift thereby make.When being 13.33pJ for pump energy, mobile distance is 0.5nm, and corresponding variations in refractive index is 10
-4, and as can be seen from the figure, the displacement of resonance peak can clearly distinguish.Pump energy corresponding to the distinguishable variations in refractive index of minimum is 4.61pJ.
See through spectrum and upward one conduction resonance mode is also arranged the 808nm position, the present invention gets pump light and is positioned near this pattern, outfield and photonic crystal panel conduction resonance mode produce resonance coupling makes near the field intensity the photonic crystal panel be enhanced, thereby makes pump energy further be reduced.
As shown in Figure 6, when outside pumping light power was 0, transmitance was very low during the flashlight vertical incidence photonic crystal of 1550nm, and less than 10%, flashlight can not pass through, corresponding to " closing " state of photoswitch; When outside pumping light power increases to 184fJ, because being positioned at the spectrum that sees through at 1550nm place, the script that the reduction of indium phosphide refractive index is caused become high permeability, its transmitance is greater than 90%, near 100%, at this moment corresponding to " unlatching " state of photoswitch.
Photonic crystal panel structure provided by the present invention, because of its conduction resonance peak changes very responsive to nonlinear refractive index, the resonance peak quality factor is very high, and the field intensity enhancement effect of pump light and resonance Mode Coupling makes photoswitch need lower pump energy simultaneously; The photonic crystal lattice constant that is adopted is near 800nm, and micro fabrication is realized easily; The incident light direction is perpendicular to photonic crystal plane or incident at a certain angle, does not need strict end face coupling, and the photoswitch experiment is simple, and the practical application condition is not harsh.Photoswitch pump energy provided by the present invention can be realized the contrast near 100% during for 184fJ, is the minimum photoswitch of pump energy known at present.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a method of utilizing the displacement of photonic crystal panel conduction resonance peak to realize photoswitch is characterized in that, comprising:
Step 1: make a photonic crystal panel structure (13) based on indium phosphide;
Step 2: build photoswitch experiment light path system, this light path system comprises: a signal optical source (10), the incident light that is positioned at the 1550nm wave band that is sent by signal optical source (10) is divided into two parts by spectroscope (11), wherein a part shines photonic crystal panel structure (13) on the sample stage that is seated in angle rotatable via condenser lens (12), and by photodiode (14) collection transmitted light, first wave filter (15) carries out useful signal and extracts; Another bundle light is then directly collected by photodiode (16) and second wave filter (17); First wave filter (15) and second wave filter (17) the signal that extracts all analyze by computing machine (19);
Step 3: the pump light that pump light source (18) is sent is radiated on the photonic crystal panel structure (13), causes the variation of photonic crystal panel structure (13) nonlinear refractive index, causes to see through to compose to change, thereby realizes photoswitch.
2. the method for utilizing the displacement of photonic crystal panel conduction resonance peak to realize photoswitch according to claim 1, it is characterized in that, described photonic crystal panel structure (13) is a tetragonal lattice crystal structure, this structure has following parameter: grating constant is 800nm, thickness is 240nm, and little pore radius is 80nm.
3. the method for utilizing the displacement of photonic crystal panel conduction resonance peak to realize photoswitch according to claim 1, it is characterized in that described pump light source (18) is the laser instrument that is used for pumping, its wavelength is tunable in the 800nm left and right sides, repetition frequency is 1kHz, and pulsewidth is psec or femtosecond magnitude.
4. the method for utilizing the displacement of photonic crystal panel conduction resonance peak to realize photoswitch according to claim 1 is characterized in that, the described spectrum that sees through sees through spectrum for the wavelength of photonic crystal panel structure (13), or angle sees through spectrum.
5. the method for utilizing the displacement of photonic crystal panel conduction resonance peak to realize photoswitch according to claim 3, it is characterized in that, described pump light wavelength 800nm is positioned at through the last conduction of spectrum resonance peak and puts, pump light and photonic crystal panel structure (13) conduction resonance mode produce resonance coupling makes near the field intensity the photonic crystal panel structure (13) strengthen 5 times, thereby reduces pump energy.
6. the method for utilizing the displacement of photonic crystal panel conduction resonance peak to realize photoswitch according to claim 1 is characterized in that, the spectrum that sees through of described photonic crystal panel structure (13) goes up conduction resonance peak quality factor up to 10
5, realize that the required minimum refractive index changes delta of photoswitch n is 2.5 * 10
-5RIU, required minimum pump energy is 184fJ.
7. the method for utilizing the displacement of photonic crystal panel conduction resonance peak to realize photoswitch according to claim 1 is characterized in that described photoswitch works near the 1550nm of communication band.
8. the method for utilizing the displacement of photonic crystal panel conduction resonance peak to realize photoswitch according to claim 1, it is characterized in that, described flashlight and pump light all are coupled into photonic crystal panel structure (13) perpendicular to photonic crystal panel structure (13) or incident at a certain angle, do not need strict end face coupling.
9. the method for utilizing the displacement of photonic crystal panel conduction resonance peak to realize photoswitch according to claim 1 is characterized in that described light shutter device is of a size of 100 μ m
2, adopt micro-processing method to realize easily.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684809A (en) * | 2011-12-08 | 2012-09-19 | 中国科学院半导体研究所 | Method for realizing dense wavelength division multiplexing (DWDM) by utilizing photonic crystal panel Fano resonance effect |
| WO2016091193A1 (en) * | 2014-12-10 | 2016-06-16 | 深圳大学 | High-polarization-degree and high-extinction-ratio te optical switch based on photonic crystal slabs |
| CN108317971A (en) * | 2018-01-30 | 2018-07-24 | 河南理工大学 | A kind of angle detection device |
| CN110727058A (en) * | 2019-11-11 | 2020-01-24 | 中国科学院大学 | Turning optical switch control method based on metamaterial resonator and optical switch |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006323231A (en) * | 2005-05-20 | 2006-11-30 | Ricoh Co Ltd | Optical element and method for manufacturing the same |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006323231A (en) * | 2005-05-20 | 2006-11-30 | Ricoh Co Ltd | Optical element and method for manufacturing the same |
Non-Patent Citations (2)
| Title |
|---|
| 《J.Opt.Soc.Am.B》 20051111 Jessica P. Mondia et. Ultrafast tuning of two-dimensional planar photonic-crystal waveguides via free-carrier injection and the optical Kerr effect 2480-2486 1-9 第22卷, 第11期 2 * |
| 《PHOTONICS TECHNOLOGY LETTERS》 20071001 In-Kag Hwang et. All-Optical Switching in InGaAsP-InP Photonic Crystal Resonator Coupled With Microfiber 1535-1537 1,4,7-9 第19卷, 第19期 2 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684809A (en) * | 2011-12-08 | 2012-09-19 | 中国科学院半导体研究所 | Method for realizing dense wavelength division multiplexing (DWDM) by utilizing photonic crystal panel Fano resonance effect |
| WO2016091193A1 (en) * | 2014-12-10 | 2016-06-16 | 深圳大学 | High-polarization-degree and high-extinction-ratio te optical switch based on photonic crystal slabs |
| US9885939B2 (en) | 2014-12-10 | 2018-02-06 | Zhengbiao OUYANG | TE optical switch based on slab photonic crystals with high degree of polarization and large extinction ratio |
| CN108317971A (en) * | 2018-01-30 | 2018-07-24 | 河南理工大学 | A kind of angle detection device |
| CN110727058A (en) * | 2019-11-11 | 2020-01-24 | 中国科学院大学 | Turning optical switch control method based on metamaterial resonator and optical switch |
| CN110727058B (en) * | 2019-11-11 | 2020-07-24 | 中国科学院大学 | Turning optical switch control method based on metamaterial resonator and optical switch |
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