CN112363329A - Dull and stereotyped structure based on transmission characteristic can be regulated and control to phase change material - Google Patents
Dull and stereotyped structure based on transmission characteristic can be regulated and control to phase change material Download PDFInfo
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- CN112363329A CN112363329A CN202011418539.0A CN202011418539A CN112363329A CN 112363329 A CN112363329 A CN 112363329A CN 202011418539 A CN202011418539 A CN 202011418539A CN 112363329 A CN112363329 A CN 112363329A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 38
- 239000012782 phase change material Substances 0.000 title claims abstract description 32
- 230000001105 regulatory effect Effects 0.000 title abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 7
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract 2
- 238000002834 transmittance Methods 0.000 abstract description 10
- 230000001276 controlling effect Effects 0.000 abstract description 8
- 230000033228 biological regulation Effects 0.000 abstract description 6
- 238000000411 transmission spectrum Methods 0.000 abstract description 6
- 230000005693 optoelectronics Effects 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- PVADDRMAFCOOPC-UHFFFAOYSA-N oxogermanium Chemical compound [Ge]=O PVADDRMAFCOOPC-UHFFFAOYSA-N 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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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
- G02F1/0009—Materials therefor
- G02F1/0063—Optical properties, e.g. absorption, reflection or birefringence
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
本发明公开了一种基于相变材料可调控传输特性的平板结构，属于光电材料和电磁波传输调控技术领域。本发明解决了现有用于调控传输特性的结构复杂，调控频带窄等问题。本发明提供的平板结构由GST/SiO2/GST的三明治结构组成，该平板结构通过控制GST的状态实现宽带范围内透射光谱的调控，当GST在晶态和非晶态之间转换时，5.786‑7.164μm的波长范围内透射率差值的平均值可达0.917。此外，本发明还具有结构简单，易于大规模生产的特点，并且当入射角度在60°以内时仍能保持良好的性能，这使得在实际中拥有更加广泛的应用。
The invention discloses a flat plate structure with adjustable transmission characteristics based on a phase change material, belonging to the technical field of optoelectronic materials and electromagnetic wave transmission control. The present invention solves the problems of complex structure and narrow control frequency band for regulating and controlling transmission characteristics in the prior art. The flat plate structure provided by the invention is composed of a sandwich structure of GST/SiO 2 /GST. The flat plate structure realizes the regulation of transmission spectrum in a broadband range by controlling the state of GST. When GST is converted between crystalline state and amorphous state, 5.786 The average value of the transmittance difference in the wavelength range of ‑7.164μm can reach 0.917. In addition, the present invention also has the characteristics of simple structure, easy mass production, and can still maintain good performance when the incident angle is within 60°, which makes it more widely used in practice.
Description
Technical Field
The invention relates to a flat plate structure capable of regulating and controlling transmission characteristics based on a phase-change material, and belongs to the technical field of photoelectric materials and electromagnetic wave transmission regulation and control.
Background
In recent years, the transmission characteristics of the infrared band are widely focused and researched, and the infrared band has a very wide application prospect in the aspects of imaging systems, biosensors, filters, optical switching and the like.
In practice, the structure capable of dynamically adjusting and controlling the transmission characteristics has wider application. In recent years, in designing structures with adjustable transmission characteristics, it is most of the time to adjust the transmission spectrum by changing the size of the structure, such as the thickness or the period of the resonant cell. In which case it is difficult to directly change the transmission spectral characteristics of the structure once it has been processed.
The phase change material is a light wave control material with great potential, and can change phase by adopting a temperature control mode so as to change the optical characteristics of the material. Phase change materials are widely used in the design of tunable optical devices. Ge (germanium) oxide2Sb2Te5(GST) is a typical phase change material, and can achieve conversion between a crystalline state (cGST) and an amorphous state (aGST) in a time range of several tens of nanoseconds. Any crystalline state between crystalline and amorphous states can be stable with precise control of the energy and duration of the energy imparted. Because of their fast switching speed between states, good thermal stability, and significant difference in complex refractive index, GST has a great deal of brilliance in the design of tunable optical devices (e.g., absorbers, variable focus lenses, polarization converters). At present, optical devices for regulating and controlling transmission by utilizing phase-change materials are proposed in succession, but the problems that the structure is complex and the processing is not easy to carry out exist, and the regulation and control transmission characteristics are mostly concentrated in narrow bands, so that the effective regulation and control under a single wavelength can be realized only. Therefore, it is necessary to provide a structure which is simple in structure and effectively regulates the transmission characteristics in a wide band range.
Disclosure of Invention
The invention provides a flat plate structure capable of regulating and controlling transmission characteristics based on a phase-change material, aiming at solving the problems of complex structure, narrow regulation and control frequency band and the like of the conventional structure for regulating and controlling the transmission characteristics.
The utility model provides a dull and stereotyped structure based on transmission characteristic can be regulated and control to phase change material, this dull and stereotyped structure is piled up by the three-layer flat board and forms, is top layer, intermediate level and bottom from top to bottom in proper order, top layer and bottom be the same phase change material GST of size, the intermediate level is SiO2A material.
Further, the thickness of the phase change material GST of the top layer and the bottom layer is 0.65 μm to 0.8 μm.
Further, the thickness of the phase change material GST of the top layer and the bottom layer is 0.764 μm.
Further, the phase change materials GST of the top and bottom layers have refractive indexes varying with wavelength, and the refractive indexes thereof are as shown in fig. 2.
Further, the intermediate layer and the top layer are of different thickness.
Further, the thickness of the intermediate layer is 0.8 μm to 1.2. mu.m.
Further, the thickness of the intermediate layer was 1 μm.
Further, the refractive index of the intermediate layer was 1.45.
Further, the top layer, the middle layer and the bottom layer are stacked without gaps.
The invention has the following beneficial effects: the flat plate structure with adjustable transmission characteristics provided by the invention realizes the adjustment and control of broadband transmission spectrum, can still keep good performance when being incident at a large angle, has good tolerance to the incident angle, and makes up the defect of complicated design structure in the prior art. The transmission spectrum can be regulated in a broadband range by controlling the state of GST, when GST is switched between crystalline state and amorphous state, the average value of the transmittance difference in the wavelength range of 5.786-7.164 μm can reach 0.917, and good performance can be still maintained when the incident angle is within 60 deg.
Drawings
FIG. 1 is a schematic diagram of a plate structure based on phase change materials with controllable transmission characteristics;
FIG. 2 is a graph of the refractive indices of the top and bottom layer phase change materials GST;
FIG. 3 is a transmitted light spectrum of the flat panel structure of example 1 at normal incidence of TM waves;
FIG. 4 is a magnetic field plot in the x-z plane of the slab structure of example 1 at an incident wavelength of 6 μm with the GST being amorphous aGST;
FIG. 5 is a magnetic field plot in the x-z plane of the plate structure of example 1 at an incident wavelength of 6 μm with GST being crystalline cGST;
FIG. 6 is a transmission spectrum of the plate structure of example 1 when the GST is amorphous aGST, and TM waves are incident at different incident angles;
FIG. 7 is a transmitted light spectrum of the plate structure of example 1 when GST is crystalline cGST, and TM waves are incident at different incident angles;
in the figure, 1-the top layer, 2-the middle layer, 3-the bottom layer.
Detailed Description
The experimental procedures used in the following examples are conventional unless otherwise specified. The materials, reagents, methods and apparatus used, unless otherwise specified, are conventional in the art and are commercially available to those skilled in the art.
Example 1:
as shown in fig. 1, the plate structure with adjustable transmission characteristics based on phase change material in the present embodiment is formed by stacking three layers of plates, wherein the top layer 1 is phase change material GST, and the thickness t is10.764 μm; the intermediate layer 2 is silicon dioxide, has a refractive index of 1.45 and a thickness t2Is 1 μm; the bottom layer 3 is phase change material GST with thickness t3It was 0.764. mu.m. The refractive indices of the phase change materials GST of the top layer 1 and the bottom layer 3 are shown in fig. 2. As can be seen from FIG. 2, there is a large difference between real parts of aGST and cGST refractive indices in the infrared band, and this difference remains stable at 5-8 μm. Since the imaginary part of the aGST index is 0, there is no absorption.
The performance of the flat plate structure based on the adjustable transmission characteristic of the phase-change material is characterized through software simulation:
numerical simulation is carried out by adopting a finite difference time domain method (FDTD), periodic boundary conditions are adopted in the x direction and the y direction during simulation, a Perfect Matching Layer (PML) is adopted in the z direction, plane waves with the wavelength range of 5-8 mu m are used for incidence along the z axis, the mode of a light source is arranged to be bloch/period under the normal incidence condition, and a monitor is placed above a simulation area below the structure and used for monitoring the transmittance.
Simulations were performed according to the above settings, resulting in transmission spectrograms in both aGST and cGST states, as shown in FIG. 3. As can be seen from FIG. 3, two distinct transmission peaks were observed in the aGST state, with a transmission of up to 0.99 at wavelengths of 6 μm and 6.866 μm, respectively, and with a continuous high transmission (T)>80%) was 1.378 μm. And in the cGST state, the transmittance of the whole simulation wave band is flat at 5-8 mu mThe mean value was 0.016. To quantitatively describe the regulation of transmission characteristics, we define the difference in transmission between the two states as Δ T ═ TcGST-TaGSTL. The difference in transmission in the two states of GST was 0.99 at wavelengths of 6 μm and 6.866 μm. And the average value of the transmittance difference in the wavelength range of 5.786 to 7.164 μm can reach 0.917. Therefore, the flat plate structure provided in example 1 can realize the adjustment and control of the transmission characteristics in a broadband range.
The magnetic field distribution in the x-y plane at a wavelength of 6 μm was calculated, and the result is shown in FIG. 4. As can be seen from fig. 4, for gst, the magnetic field is enhanced at the top and bottom layers due to FP resonance generated at the gst of the top and bottom layers, whereas for cGST, light is localized at the top cGST plate, and thus the transmission is almost 0.
The transmission spectrum of the TM wave at different angles of incidence (0 °, 20 °, 40 ° and 60 °) is shown in fig. 5. As can be seen from the figure, in gst, the wavelength band of high transmittance is blue-shifted with increasing incidence angle, but the transmittance is not decreased. For cGST, the transmittance curve of the 5-7 μm band almost coincides with that at normal incidence as the angle of incidence increases, and the transmittance is still less than 0.2 when the angle of incidence is less than 60 °, although there is a slight increase in transmittance at long wavelengths. Therefore, the flat plate structure provided by the invention can still maintain good performance under the condition of large-angle incidence.
Claims (8)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113371671A (en) * | 2021-05-26 | 2021-09-10 | 华南师范大学 | Method and device for regulating and controlling near-field radiation heat transfer of micro-nano flat plate through magnetic field |
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