CN112596255A - Wave plate-based unidirectional transmission device for linear and circular polarized light, experimental device and use method - Google Patents
Wave plate-based unidirectional transmission device for linear and circular polarized light, experimental device and use method Download PDFInfo
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- G—PHYSICS
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a one-way transmission device, an experimental device and a using method for linear and circular polarized light based on a wave plate, wherein the one-way transmission device for the linear polarized light is composed of a half wave plate and a polarizing plate, the half wave plate and the polarizing plate are arranged on the same strut, the optical axis of the half wave plate and the optical axis of the polarizing plate are sequentially arranged on the same straight line, and the included angle between the optical axis of the half wave plate and an incident plane is 45 degrees; the polarizing plate is arranged between the two quarter-wave plates, and an included angle between the optical axis of the first quarter-wave plate and the incident plane is 45 degrees. The device has high average transmittance contrast ratio of positive and negative transmission, can meet the one-way transmission of linearly polarized light and circularly polarized light, and has simple structure without additional excitation.
Description
Technical Field
The invention relates to the technical field of electromagnetic wave transmission regulation and control, in particular to a unidirectional transmission device for linear and circular polarized light based on a wave plate, an experimental device and a using method.
Background
The unidirectional transmission means that the transmittance of light incident from the front side of the structure is greatly different from that of light incident from the back side of the structure, and the technology is a light wave irreversible technology. With the development of information technology, people pay more and more attention to information security. Therefore, the unidirectional transmission has a wide application prospect in the aspects of optical communication systems and information processing, and the realization of the unidirectional transmission of electromagnetic waves is very important.
The traditional method for realizing unidirectional transmission uses magneto-optical materials and nonlinear materials, however, the magneto-optical materials need an external strong magnetic field to generate magneto-optical effect, and the volume is large, which is not favorable for integration. There have also been studies showing that unidirectional transmission with a contrast of 40dB can be achieved using silicon nonlinearity, but this method requires strong external excitation to excite the nonlinearity and will be limited in use by the excitation source.
Disclosure of Invention
The invention provides a wave plate-based unidirectional transmission device, an experimental device and a using method for linear and circular polarized light, and aims to solve the technical problems that the existing unidirectional transmission method is complex in structure, large in size and not beneficial to integration, and needs external excitation.
An embodiment of an aspect of the present invention provides a unidirectional transmission device for linearly polarized light, including: the polarizer comprises a half wave plate and a polarizer, wherein the half wave plate and the polarizer are arranged on the same strut, the center of the half wave plate and the center of the polarizer are on the same line, the half wave plate is arranged in front of the polarizer, and the included angle between the optical axis of the half wave plate and the incident plane is 45 degrees.
The embodiment of the second aspect of the invention provides an experimental device for a one-way transmission device of linearly polarized light, which comprises: the one-way transmission device for the linearly polarized light, the laser, the optical power meter and the processor are characterized in that the laser is used for emitting the linearly polarized light; the one-way transmission device for the linearly polarized light is arranged between the laser and the optical power meter and is used for transmitting the linearly polarized light in the forward direction and inhibiting the transmission of the linearly polarized light in the reverse direction; the optical power meter is used for measuring forward transmittance and reverse transmittance; and the processor is connected with the optical power meter and used for processing the plurality of forward transmittances and the plurality of and reverse transmittances to obtain contrast so as to determine whether the transmission is unidirectional transmission.
The embodiment of the third aspect of the invention provides a use method of an experimental device for a one-way transmission device for linearly polarized light based on a wave plate, which comprises the following steps: emitting a first linearly polarized light by the laser; enabling the first linearly polarized light to positively pass through the one-way transmission device for the linearly polarized light; measuring the transmittance in the forward direction through the unidirectional transmission device by using the optical power meter; rotating the one-way transmission device for linearly polarized light by 180 degrees; emitting the first linearly polarized light again through the laser; enabling the first linearly polarized light to reversely pass through the one-way transmission device for the linearly polarized light; measuring the transmittance through the unidirectional transmission device in the reverse direction by using the optical power meter; measuring for multiple times to obtain multiple forward transmittances and multiple reverse transmittances; and processing the plurality of forward transmittances and the plurality of reverse transmittances by using a processor to obtain a maximum contrast ratio and a minimum contrast ratio, and further determining whether the transmission is unidirectional transmission.
In a fourth aspect, the present invention provides a unidirectional transmission device for circularly polarized light based on a wave plate, including: the polarizer comprises a first quarter-wave plate, a second quarter-wave plate and a polarizer, wherein the two quarter-wave plates and the polarizer are arranged on the same strut, the centers of the two quarter-wave plates and the center of the polarizer are on the same line, the first quarter-wave plate is positioned in front of the polarizer, the second quarter-wave plate is positioned behind the polarizer, and the included angle between the optical axis of the first quarter-wave plate and the incident plane is 45 degrees.
The embodiment of the fifth aspect of the invention provides an experimental device for a unidirectional transmission device for circularly polarized light based on a wave plate, which comprises: the device comprises a third quarter-wave plate, the one-way transmission device for circularly polarized light, a laser, an optical power meter and a processor, wherein the laser is used for emitting linearly polarized light; the third quarter-wave plate is arranged behind the laser and used for converting the linearly polarized light into circularly polarized light; the one-way transmission device for circularly polarized light is arranged between the third quarter-wave plate and the optical power meter and is used for transmitting the circularly polarized light in the forward direction and inhibiting the transmission of the circularly polarized light in the reverse direction; the optical power meter is used for measuring forward transmittance and reverse transmittance; and the processor is connected with the optical power meter and used for processing the plurality of forward transmittances and the plurality of reverse transmittances to obtain contrast so as to determine whether the transmission is unidirectional transmission.
The embodiment of the sixth aspect of the invention provides an experimental device using method of a unidirectional transmission device for circularly polarized light based on a wave plate, which comprises the following steps: emitting a first linearly polarized light by the laser; converting the first linearly polarized light into first circularly polarized light by using the third quarter-wave plate; passing said first circularly polarized light forward through said means for unidirectional transmission of circularly polarized light; measuring the transmittance in the forward direction through the unidirectional transmission device by using the optical power meter; rotating the one-way transmission device for circularly polarized light by 180 degrees; emitting the first linearly polarized light again through the laser; converting the first linearly polarized light into first circularly polarized light by using the third quarter-wave plate; passing said first circularly polarized light in reverse through said means for unidirectional transmission of circularly polarized light; measuring the transmittance through the unidirectional transmission device in the reverse direction by using the optical power meter; obtaining a plurality of forward transmittances and a plurality of reverse transmittances through a plurality of measurements; and processing the plurality of forward transmittances and the plurality of reverse transmittances by using a processor to obtain a maximum contrast ratio and a minimum contrast ratio, and further determining whether the transmission is unidirectional transmission.
The technical scheme of the invention at least realizes the following beneficial technical effects:
the structure is simple, and external excitation is not needed; the one-way transmission of linear polarization and circular polarization can be simultaneously satisfied; in addition, the positive and negative transmission transmissivity of the two one-way transmission devices has high contrast, the linear polarization can reach 37.3dB, and the circularly polarized light can reach 34.6 dB.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a one-way transmission device for linearly polarized light according to one embodiment of the invention;
FIG. 2 is a graph of measured transmission in two directions and corresponding contrast when linearly polarized light is incident, according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of a device for unidirectional transmission of circularly polarized light according to an embodiment of the present invention;
fig. 4 is a graph of measured transmission in two directions and corresponding contrast ratio images when circularly polarized light is incident, according to one embodiment of the present invention.
Description of reference numerals:
the device comprises a 10-linearly polarized light one-way transmission device, a 11-half wave plate, a 12-polaroid, a 13-laser, a 14-optical power meter, a 30-circularly polarized light one-way transmission device, a 31-first quarter wave plate, a 32-second quarter wave plate, a 33-polaroid, a 34-laser, a 35-power meter and a 36-third quarter wave plate.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The wave plate-based unidirectional transmission apparatus proposed according to an embodiment of the present invention is described below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a one-way transmission device for linearly polarized light according to an embodiment of the invention.
As shown in fig. 1, the unidirectional transmission device 10 for linearly polarized light includes: a half-wave plate 11 and a polarizer 12.
The half-wave plate and the polaroid are arranged on the same strut, the center of the half-wave plate and the center of the polaroid are sequentially arranged on the same straight line, and the included angle between the optical axis of the half-wave plate and the incident plane is 45 degrees.
The performance of the linearly polarized single-direction transmission device is explained by an experimental device for a linearly polarized single-direction transmission device based on a wave plate.
The experimental device comprises: a half-wave plate 11, a polarizer 12, a laser 13, an optical power meter 14 and a processor (not shown). Wherein, a half-wave plate 11 and a polarizer 12 are arranged on the same strut, the wavelength of the laser 13 is 633nm, and the power is 1.5 mW. An optical power meter 14 is used to measure the transmittance.
The specific implementation steps are as follows: a linearly polarized light beam with a wavelength of 633nm and a power of 1.5mW is emitted from the laser 13, an included angle between an incident surface and an optical axis of the first half-wave plate 11 is ensured to be 45 °, and then the linearly polarized light beam sequentially passes through the half-wave plate 11 and the polarizing plate 12, and then the transmittance is measured by using a power meter. At this time, the transmittance in one direction is measured, and then the pillar on which the half-wave plate 11 and the polarizer 12 are mounted is rotated by 180 ° to measure the transmittance in the opposite direction, the experiment is repeated three times and data is recorded, and the contrast is calculated by a processor to determine whether the transmission is unidirectional. .
The forward direction is that linearly polarized light firstly passes through the half wave plate and then passes through the polaroid, and the reverse direction is that the linearly polarized light firstly passes through the polaroid and then passes through the half wave plate.
As shown in fig. 2, when linearly polarized light is incident, the transmittance measured in two directions and the corresponding contrast ratio. The average transmittances of forward and reverse transmissions were 0.787 and 0.142 × 10, respectively-3. Minimum contrast 37.3dB, difference between maximum and minimum contrast less than 1%, tableThe experimental result is reliable. The forward transmittance is lower than 0.8 due to reflection and absorption by the polarizing plate 13. The transmittance in forward transmission can be further enhanced if an anti-reflection coating is added.
Further, as shown in fig. 3, the unidirectional transmission device 30 for circularly polarized light includes: a first quarter-wave plate 31, a second quarter-wave plate 32 and a polarizer 33.
The two quarter-wave plates and the polaroid are arranged on the same strut, the centers of the two quarter-wave plates and the center of the polaroid are on the same straight line, the first quarter-wave plate is positioned in front of the polaroid, the second quarter-wave plate is positioned behind the polaroid, and the included angle between the optical axis of the first quarter-wave plate and the incident plane is 45 degrees.
The performance of the unidirectional transmission device for circularly polarized light is explained below by an experimental device for the unidirectional transmission device for circularly polarized light based on a wave plate.
The device includes: a first quarter wave plate 31, a second quarter wave plate 32, a polarizer 33, a laser 34, a power meter 35, a third quarter wave plate 36 and a processor (not shown). Wherein, the two quarter-wave plates and the polaroid 33 are arranged on the same strut; the wavelength of the laser 34 is 633nm, and the power is 1.5 mW; the power meter 35 is used to measure the transmittance.
The specific implementation steps are as follows: a beam of linearly polarized light with the wavelength of 633nm and the power of 1.5mW is emitted from the laser 34, passes through the third quarter-wave plate 36, and the included angle between the incident surface and the optical axis of the first quarter-wave plate is 45 °. The third quarter-wave plate 36 functions to convert the linearly polarized light emitted from the laser 34 into circularly polarized light, the resulting circularly polarized light is passed through the unidirectional transmission device proposed in the present invention, where the transmittance in one direction is measured, and then the column on which the first quarter-wave plate 31, the second quarter-wave plate 32 and the polarizer 33 are mounted is rotated 180 ° to measure the transmittance in the opposite direction. And repeating the experiment for three times, recording data, and calculating the contrast by using a processor so as to determine whether the transmission is unidirectional transmission.
The forward direction is that the circularly polarized light firstly passes through the first quarter-wave plate, then passes through the polaroid and finally passes through the second quarter-wave plate, and the reverse direction is that the circularly polarized light firstly passes through the second quarter-wave plate, then passes through the polaroid and finally passes through the first quarter-wave plate.
As shown in fig. 4, the transmission measured in both directions and the corresponding contrast when circularly polarized light is incident. The average transmittance toward the front and back was 0.755 and 0.206X 10, respectively-3. The minimum contrast is 34.6 dB. The difference between the maximum and minimum contrast is less than 6%, indicating that the experimental results are relatively reliable. The reduction in forward transmission is also due to reflection and absorption by the polarizer.
Furthermore, the half-wave plate, the quarter-wave plate and the polarizer adopted by the invention are the most common elements in optical experiments, and the manufacturing process is mature, so that the processing of the combined structure is feasible.
In summary, the unidirectional transmission device based on the wave plate provided by the embodiment of the invention has high forward and reverse transmission contrast, simple structure and no need of additional excitation, and is expected to be widely applied to optical communication systems and information processing.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A unidirectional transmission device for linearly polarized light based on a wave plate is characterized by comprising: the polarizer comprises a half wave plate and a polarizer, wherein the half wave plate and the polarizer are arranged on the same strut, the center of the half wave plate and the center of the polarizer are sequentially arranged on the same straight line, and the included angle between the optical axis of the half wave plate and the incident plane is 45 degrees.
2. A unidirectional waveplate-based transmission device for linearly polarized light according to claim 1, wherein when linearly polarized light is incident, the average transmission rate of forward passing through said half waveplate and said polarizer is much greater than that of reverse passing.
3. A one-way transmission device for linearly polarized light based on a wave plate as claimed in claim 1, wherein the forward direction is that the linearly polarized light passes through the half wave plate first and then the polarizer, and the reverse direction is that the linearly polarized light passes through the polarizer first and then the half wave plate.
4. An experimental device for a one-way transmission device of linearly polarized light based on a wave plate is characterized by comprising: a unidirectional transmission device for linearly polarized light, a laser, an optical power meter and a processor as claimed in any one of the above claims 1 to 3, wherein,
the laser is used for emitting linearly polarized light;
the one-way transmission device for the linearly polarized light is arranged between the laser and the optical power meter and is used for transmitting the linearly polarized light in the forward direction and inhibiting the transmission of the linearly polarized light in the reverse direction;
the optical power meter is used for measuring forward transmittance and reverse transmittance;
and the processor is connected with the optical power meter and used for processing the plurality of forward transmittances and the plurality of and reverse transmittances to obtain contrast so as to determine whether the transmission is unidirectional transmission.
5. The experimental device using method for the one-way transmission device of the linearly polarized light based on the wave plate is characterized in that the experimental device based on the claim 4 comprises the following steps:
emitting a first linearly polarized light by the laser;
enabling the first linearly polarized light to positively pass through the one-way transmission device for the linearly polarized light;
measuring the transmittance in the forward direction through the unidirectional transmission device by using the optical power meter;
rotating the one-way transmission device for linearly polarized light by 180 degrees;
emitting the first linearly polarized light again through the laser;
enabling the first linearly polarized light to reversely pass through the one-way transmission device for the linearly polarized light;
measuring the transmittance through the unidirectional transmission device in the reverse direction by using the optical power meter;
measuring for multiple times to obtain multiple forward transmittances and multiple reverse transmittances;
and processing the plurality of forward transmittances and the plurality of reverse transmittances by using a processor to obtain a maximum contrast ratio and a minimum contrast ratio, and further determining whether the transmission is unidirectional transmission.
6. A unidirectional transmission device for circularly polarized light based on a wave plate, comprising: the polarizer comprises a first quarter-wave plate, a second quarter-wave plate and a polarizer, wherein the two quarter-wave plates and the polarizer are arranged on the same strut, the centers of the two quarter-wave plates and the center of the polarizer are on the same straight line, the first quarter-wave plate is positioned in front of the polarizer, the second quarter-wave plate is positioned behind the polarizer, and the included angle between the optical axis of the first quarter-wave plate and the incident plane is 45 degrees.
7. The unidirectional waveplate-based transmission apparatus for circularly polarized light according to claim 6, wherein when circularly polarized light is incident, the average transmittance of the light passing through the first quarter-wave plate, the polarizer and the second quarter-wave plate in the forward direction is much greater than the average transmittance of the light passing through the second quarter-wave plate in the reverse direction.
8. The unidirectional waveplate-based transmission apparatus of claim 7, wherein the forward direction is that the circularly polarized light passes through the first quarter-wave plate, then the polarizer, and finally the second quarter-wave plate, and the reverse direction is that the circularly polarized light passes through the second quarter-wave plate, then the polarizer, and finally the first quarter-wave plate.
9. An experimental device for a one-way transmission device of circularly polarized light based on a wave plate is characterized by comprising: a third quarter-wave plate, the unidirectional transmission device for circularly polarized light of any one of claims 6 to 8, a laser, an optical power meter and a processor, wherein,
the laser is used for emitting linearly polarized light;
the third quarter-wave plate is arranged behind the laser and used for converting the linearly polarized light into circularly polarized light;
the one-way transmission device for circularly polarized light is arranged between the third quarter-wave plate and the optical power meter and is used for transmitting the circularly polarized light in the forward direction and inhibiting the transmission of the circularly polarized light in the reverse direction;
the optical power meter is used for measuring forward transmittance and reverse transmittance;
and the processor is connected with the optical power meter and used for processing the plurality of forward transmittances and the plurality of and reverse transmittances to obtain contrast so as to determine whether the transmission is unidirectional transmission.
10. An experimental device using method for a unidirectional transmission device for circularly polarized light based on a wave plate, which is characterized in that the experimental device based on claim 9 comprises the following steps:
emitting a first linearly polarized light by the laser;
converting the first linearly polarized light into first circularly polarized light by using the third quarter-wave plate;
passing said first circularly polarized light forward through said means for unidirectional transmission of circularly polarized light;
measuring the transmittance in the forward direction through the unidirectional transmission device by using the optical power meter;
rotating the one-way transmission device for circularly polarized light by 180 degrees;
emitting the first linearly polarized light again through the laser;
converting the first linearly polarized light into first circularly polarized light by using the third quarter-wave plate;
passing said first circularly polarized light in reverse through said means for unidirectional transmission of circularly polarized light;
measuring the transmittance through the unidirectional transmission device in the reverse direction by using the optical power meter;
measuring for multiple times to obtain multiple forward transmittances and multiple reverse transmittances;
and processing the plurality of forward transmittances and the plurality of reverse transmittances by using a processor to obtain a maximum contrast ratio and a minimum contrast ratio, and further determining whether the transmission is unidirectional transmission.
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|---|---|---|---|---|
| GB1062453A (en) * | 1963-06-05 | 1967-03-22 | Ibm | Optical apparatus |
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| CN101581837A (en) * | 2009-03-26 | 2009-11-18 | 南京大学 | Method for arranging bidirectional optical isolator |
| CN202677010U (en) * | 2012-06-14 | 2013-01-16 | 昂纳信息技术（深圳）有限公司 | Free space isolator |
| CN202710848U (en) * | 2012-08-21 | 2013-01-30 | 北京量拓科技有限公司 | Linearly-polarized light generating device with high energy utilization rate and application thereof |
| CN104535192A (en) * | 2015-01-09 | 2015-04-22 | 北京理工大学 | Stokes polarization meter error calibration and compensation method based on wave plate rotating method |
-
2020
- 2020-12-31 CN CN202011639853.1A patent/CN112596255A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1062453A (en) * | 1963-06-05 | 1967-03-22 | Ibm | Optical apparatus |
| CA2546832A1 (en) * | 2003-11-26 | 2005-06-16 | Ruhle Companies, Inc. | Improved collimating optical member for real world simulation |
| CN101581837A (en) * | 2009-03-26 | 2009-11-18 | 南京大学 | Method for arranging bidirectional optical isolator |
| CN202677010U (en) * | 2012-06-14 | 2013-01-16 | 昂纳信息技术（深圳）有限公司 | Free space isolator |
| CN202710848U (en) * | 2012-08-21 | 2013-01-30 | 北京量拓科技有限公司 | Linearly-polarized light generating device with high energy utilization rate and application thereof |
| CN104535192A (en) * | 2015-01-09 | 2015-04-22 | 北京理工大学 | Stokes polarization meter error calibration and compensation method based on wave plate rotating method |
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