CN114035350A - Double-phase focusing sound wave type acousto-optic device and application thereof - Google Patents
Double-phase focusing sound wave type acousto-optic device and application thereof Download PDFInfo
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- CN114035350A CN114035350A CN202111185011.8A CN202111185011A CN114035350A CN 114035350 A CN114035350 A CN 114035350A CN 202111185011 A CN202111185011 A CN 202111185011A CN 114035350 A CN114035350 A CN 114035350A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 37
- 230000005284 excitation Effects 0.000 claims abstract description 21
- 230000003287 optical effect Effects 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 7
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 6
- 230000009977 dual effect Effects 0.000 claims description 4
- 230000002194 synthesizing effect Effects 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 239000007769 metal material Substances 0.000 abstract description 4
- 238000004891 communication Methods 0.000 abstract description 3
- 230000003993 interaction Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 238000004088 simulation Methods 0.000 description 5
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 230000005489 elastic deformation Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 230000008844 regulatory mechanism Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010897 surface acoustic wave method Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012795 verification Methods 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
- G02F1/01—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
- G02F1/11—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 acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a double-phase focusing sound wave type acousto-optic device and application thereof. The device comprises a bar-shaped transmission waveguide trunk and a focusing acoustic wave type flat plate, wherein the focusing acoustic wave type flat plate is axisymmetric by taking the bar-shaped transmission waveguide trunk as an axis and adopts piezoelectric materials; the right part of the focusing acoustic wave type panel is contracted and smoothly contracted on the bar-shaped transmission waveguide trunk, and the right end of the bar-shaped transmission waveguide trunk extends out; the focusing acoustic wave type panel is provided with a pair of interdigital transducers which are positioned at the upper side and the lower side of the strip transmission waveguide trunk, keep the same distance with the strip transmission waveguide trunk in the vertical direction, and have the same position with the strip transmission waveguide trunk in the horizontal direction or have the difference of integral multiples of half excitation acoustic wave wavelength. The invention is used for acousto-optic interaction devices in optical communication, optical sensing and other systems, can effectively excite a specific acoustic mode, and transmits the specific acoustic mode and the optical mode in a waveguide simultaneously to interact, and simultaneously avoids the absorption loss of metal materials forming the transducer on the optical mode.
Description
Technical Field
The invention belongs to the technical field of optical communication, optical sensing and the like, and relates to an acousto-optic device which is applicable to systems of optical communication, optical sensing and the like and utilizes an acoustic mode to regulate and control an optical mode, in particular to a double-phase focusing acoustic wave type acousto-optic device and application thereof.
Background
From the perspective of classical physics, the essence of guided wave acousto-optic regulation is that a reconfigurable multimode waveguide grating is formed by exciting one or more acoustic wave modes, so that the flexible regulation of the optical wave modes is realized, the regulation mechanism, mode and degree of freedom of the guided wave acousto-optic regulation are completely different from the regulation modes of electro-optic, thermo-optic, magneto-optic and the like, and the guided wave acousto-optic regulation has very unique advantages in the aspect of realizing various reconfigurable photon integrated devices. The common acoustic wave excitation mode is that an interdigital transducer is arranged on a piezoelectric material, an alternating electric signal is applied to the input end of the interdigital transducer for excitation, a periodically distributed electric field is generated, and due to the inverse piezoelectric effect, corresponding elastic deformation can be excited near the surface of a piezoelectric medium, so that the vibration of solid particles is caused, and the surface acoustic wave propagating along the surface of the material is formed.
However, the acoustic modes are complex and diverse, and for a selected optical mode, it is often the specific acoustic mode or modes that interact most strongly with it; moreover, for the interdigital transducer loaded with electric signals, the interdigital transducer is basically made of metal materials, and the direct arrangement on the transmission waveguide necessarily generates great absorption loss on the optical mode in the transmission waveguide. Therefore, it is still a challenge in the acousto-optic device to efficiently excite a specific acoustic mode in the acousto-optic waveguide and to avoid the absorption loss of the optical mode transmitted in the waveguide by the interdigital transducer made of metal material.
Disclosure of Invention
In view of the problems in the background art, the present invention provides a dual-phase focusing acoustic wave acousto-optic device and its application, which can efficiently excite a specific acoustic mode in an acousto-optic waveguide and avoid the absorption loss of an interdigital transducer to the optical mode.
The technical scheme adopted by the invention is as follows:
a double-phase focusing acoustic wave type acousto-optic device comprises a strip transmission waveguide trunk and a focusing acoustic wave type flat plate, wherein the focusing acoustic wave type flat plate is axisymmetric by taking the strip transmission waveguide trunk as an axis and adopts piezoelectric materials; the right part of the focusing acoustic wave type panel is contracted and smoothly contracted on the bar-shaped transmission waveguide trunk, and the right end of the bar-shaped transmission waveguide trunk extends out;
the focusing acoustic wave type panel is provided with a pair of interdigital transducers which are positioned at the upper side and the lower side of the strip transmission waveguide trunk, the interdigital transducers and the strip transmission waveguide trunk keep the same distance in the vertical direction, and the interdigital transducers and the strip transmission waveguide trunk are the same in position in the horizontal direction or differ by integral multiples of half excitation acoustic wave wavelength.
The interdigital transducer adopts uniform or chirp, parallel or inclined, weighting or coding, and one-way or two-way design.
The strip transmission waveguide trunk and the focusing acoustic wave type flat plate are based on an x-cut lithium niobate thin film material, wherein the waveguide transmission direction is along the z-axis crystal direction of lithium niobate.
An application method of a double-phase focusing acoustic wave type acousto-optic device,
by applying an electric excitation signal with MHz or GHz frequency with stable phase relation to the two-part transducer, a specific acoustic mode is selectively excited in the strip transmission waveguide trunk and interacts with an optical mode in the corresponding input strip transmission waveguide trunk, so that the input optical mode meeting the phase matching condition is subjected to mode conversion and frequency shift.
When the interdigital transducers are symmetrical in position, acoustic waves with corresponding phase relation are excited by loading electric excitation signals with stable phase relation; when the positions are asymmetric, in-phase electric excitation is loaded, and sound waves with corresponding phase relations are excited through the front and back staggered distances of the interdigital transducers; or when the positions are asymmetric, the electric excitation signals with stable phase relation are loaded to realize the superposition of phase difference;
the acoustic wave excited on the focusing acoustic wave type flat plate and having wave front with stable phase relation synthesizes acoustic modes with symmetrical characteristics when the phase difference is 0, wherein the acoustic modes comprise SV0Mode, SH0Mode and SV2A mode; synthesizing acoustic modes with anti-symmetric properties, including SV, when the phase difference is pi1A mode; and synthesizing a general acoustic mode or a combination of a plurality of special acoustic modes when the phase difference is not a special phase.
The application method is applied to an acousto-optic tuning filter, an acousto-optic isolator or an acousto-optic frequency shifter.
The invention has the beneficial effects that:
the dual-phase focusing acoustic wave design of the present invention can efficiently excite one or more acoustic modes with symmetric, anti-symmetric, or general characteristics, so as to strongly interact with the optical mode and avoid the absorption loss (to reduce the loss to be negligible) of the optical mode transmitted in the waveguide by the interdigital transducer made of metal material.
In addition, the invention has simple structure and low cost and is convenient for industrial application.
Drawings
FIG. 1 is a schematic diagram of the structure of an acousto-optic device employing a two-phase focused acoustic wave mode, in which a pair of interdigital transducers are positioned symmetrically with respect to a transmission waveguide backbone.
FIG. 2 is a schematic diagram of the acousto-optic device structure using a two-phase focusing acoustic wave mode, in which a pair of interdigital transducers are staggered by half a wavelength.
FIG. 3 is a schematic diagram of the transmission of acoustic and optical modes of an acousto-optic device employing a two-phase focused acoustic mode in accordance with the present invention.
FIG. 4 is a diagram of an SV excited by an acousto-optic device in a two-phase focused acoustic mode according to the present invention0An acoustic mode.
FIG. 5 shows SH excitable by an acousto-optic device employing a two-phase focused acoustic mode in accordance with the present invention0An acoustic mode.
FIG. 6 is an SV excited by an acousto-optic device using a two-phase focused acoustic mode according to the present invention2An acoustic mode.
FIG. 7 is a diagram of an acousto-optic device excitable SV employing a dual phase focused acoustic mode in accordance with the present invention1An acoustic mode.
FIG. 8 is a diagram illustrating the excitation of SV by two-phase focused acoustic wave in an embodiment of the present invention0And (5) simulation results of the acoustic mode.
FIG. 9 shows the application of a two-phase focused acoustic wave to excite SH in an embodiment of the present invention0And (5) simulation results of the acoustic mode.
FIG. 10 is a diagram illustrating the excitation of SV by two-phase focused acoustic wave in an exemplary embodiment of the present invention2And (5) simulation results of the acoustic mode.
FIG. 11 is a diagram illustrating the excitation of SV by two-phase focused acoustic wave in an embodiment of the present invention1And (5) simulation results of the acoustic mode.
In the figure: 1-transmission waveguide trunk, 2-focusing acoustic wave panel, 3 a-first interdigital transducer, 3 b-second interdigital transducer.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1, the acousto-optic waveguide, including the transmission waveguide trunk 1 and the focusing acoustic wave plate 2 on both sides of the entrance, is based on x-cut lithium niobate thin film material, where the waveguide transmission direction is along the z-axis crystal direction of lithium niobate. The thickness of the waveguide trunk is 300 nm, and the width of the waveguide trunk is 1 mu m; the thickness of the flat plates on both sides was 150 nm, the length of the focal section was 30 μm, and the width of both sides was 10 μm. The pair of interdigital transducers (the first interdigital transducer 3a and the second interdigital transducer 3 b) are made of gold, are symmetrically arranged around a transmission waveguide backbone, are not staggered in front and back positions, have an interdigital period of 4 μm and a duty ratio of 50%, only show 3 periods in the figure, and set 4 periods in the embodiment. The distance between the interdigital transducer and the waveguide trunk is 1 mu m, the width of a common electrode bus wire connected with the interdigital is 1 mu m, and the distance between the interdigital and the counter electrode bus wire is 1 mu m. When an electric excitation signal is loaded on the interdigital transducer, acoustic modes a and b are excited on the flat plates on the two sides and are converged on the main trunk of the acousto-optic waveguide through the focusing structure to form a synthetic acoustic mode, as shown in fig. 3.
If the phase difference of the two electric excitation signals is 0, namely the wave fronts of the acoustic waves on two sides are the same, the SV can be excited in the acousto-optic waveguide at the frequency of 0.26 GHz electric signal0Acoustic modes (fig. 4), as shown in fig. 8; SH can be excited in the acousto-optic waveguide at the frequency of 0.5 GHz electric signal0Acoustic modes (fig. 5), as shown in fig. 9; the SV can be excited in an acousto-optic waveguide at the frequency of 1.87 GHz electric signal2Acoustic pattern (fig. 6), as shown in fig. 10.
If the phase difference of the two electric excitation signals is pi, namely the wave fronts of the acoustic waves on two sides are opposite in phase, the SV can be excited in the acousto-optic waveguide at the frequency of 0.4 GHz electric signals1Acoustic pattern (fig. 7), as shown in fig. 11. 4-7, in the stem of the acousto-optic waveguide, 4 kinds of eigen-acoustic modes which can exist stably are solved; fig. 8-11 show the simulation and verification of the excitation, synthesis and transmission processes of the method of the present invention, and the acoustic modes stably transmitted in the trunk of the acousto-optic waveguide correspond to the four acoustic modes one to one.
In addition, if the two-side electric excitation signals are inverted (the original 0 phase difference becomes pi, and the original pi phase difference becomes 0), and the interdigital transducer on one side is moved forward by half a cycle, as shown in fig. 2, the same acoustic mode excitation result can be obtained.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (6)
1. A double-phase focusing acoustic wave type acousto-optic device is characterized in that: the acoustic wave focusing device comprises a strip transmission waveguide trunk (1) and a focusing acoustic wave type flat plate (2), wherein the focusing acoustic wave type flat plate (2) is axisymmetric by taking the strip transmission waveguide trunk (1) as an axis and adopts piezoelectric materials; the right part of the focusing acoustic wave type flat plate (2) is contracted and smoothly contracted on the bar-shaped transmission waveguide trunk (1), and the right end of the bar-shaped transmission waveguide trunk (1) extends out;
the focusing acoustic wave type panel (2) is provided with a pair of interdigital transducers which are positioned at the upper side and the lower side of the strip-shaped transmission waveguide trunk (1), the interdigital transducers and the strip-shaped transmission waveguide trunk (1) keep the same distance in the vertical direction, and the interdigital transducers and the strip-shaped transmission waveguide trunk (1) are same in position in the horizontal direction or differ by integral multiples of half of the wavelength of the excited acoustic wave.
2. The dual phase focusing acoustic wave acousto-optic device of claim 1, wherein:
the interdigital transducer adopts uniform or chirp, parallel or inclined, weighting or coding, and one-way or two-way design.
3. The dual phase focusing acoustic wave acousto-optic device of claim 1, wherein:
the strip transmission waveguide trunk (1) and the focusing acoustic wave type flat plate (2) are based on an x-cut lithium niobate thin film material, wherein the waveguide transmission direction is along the z-axis crystal direction of lithium niobate.
4. A method of use of the dual phase focused acoustic wave acousto-optic device of claim 1, wherein: by applying an electric excitation signal with MHz or GHz frequency with stable phase relation to the two-part transducer, a specific acoustic mode is selectively excited into the strip transmission waveguide trunk (1) and interacts with an optical mode in the corresponding input strip transmission waveguide trunk (1), so that the input optical mode meeting the phase matching condition is subjected to mode conversion and frequency shift.
5. The method of application according to claim 4, characterized in that: when the interdigital transducers are symmetrical in position, acoustic waves with corresponding phase relation are excited by loading electric excitation signals with stable phase relation; when the positions are asymmetric, in-phase electric excitation is loaded, and sound waves with corresponding phase relations are excited through the front and back staggered distances of the interdigital transducers; or when the positions are asymmetric, the electric excitation signals with stable phase relation are loaded to realize the superposition of phase difference; the acoustic waves with stable phase relation of wave fronts excited on the focusing acoustic wave type flat plate (2) are synthesized into acoustic modes with symmetrical characteristics when the phase difference is 0, wherein the acoustic modes comprise SV0Mode, SH0Mode and SV2A mode; synthesizing acoustic modes with anti-symmetric properties, including SV, when the phase difference is pi1A mode; and synthesizing a general acoustic mode or a combination of a plurality of special acoustic modes when the phase difference is not a special phase.
6. The method of application according to claim 4, characterized in that: the method is applied to an acousto-optic tuning filter, an acousto-optic isolator or an acousto-optic frequency shifter.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08194197A (en) * | 1995-01-20 | 1996-07-30 | Hoya Corp | Waveguide type acousto-optical element |
| EP0989440A1 (en) * | 1998-09-29 | 2000-03-29 | PIRELLI CAVI E SISTEMI S.p.A. | Double-pass acousto-optical device and laser |
| JP2004294567A (en) * | 2003-03-25 | 2004-10-21 | Yamanashi Tlo:Kk | Waveguide type optical frequency shifter using surface acoustic wave |
| US20070031082A1 (en) * | 2005-08-08 | 2007-02-08 | Fujitsu Limited | Optical wavelength tunable filter |
| CN101645698A (en) * | 2009-01-09 | 2010-02-10 | 中国科学院声学研究所 | Bridge type surface acoustic wave transducer in micro-optical-electro-mechanical gyroscope |
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2021
- 2021-10-12 CN CN202111185011.8A patent/CN114035350A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08194197A (en) * | 1995-01-20 | 1996-07-30 | Hoya Corp | Waveguide type acousto-optical element |
| EP0989440A1 (en) * | 1998-09-29 | 2000-03-29 | PIRELLI CAVI E SISTEMI S.p.A. | Double-pass acousto-optical device and laser |
| JP2004294567A (en) * | 2003-03-25 | 2004-10-21 | Yamanashi Tlo:Kk | Waveguide type optical frequency shifter using surface acoustic wave |
| US20070031082A1 (en) * | 2005-08-08 | 2007-02-08 | Fujitsu Limited | Optical wavelength tunable filter |
| CN101645698A (en) * | 2009-01-09 | 2010-02-10 | 中国科学院声学研究所 | Bridge type surface acoustic wave transducer in micro-optical-electro-mechanical gyroscope |
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