CN111982290A - Circular polarized light detector - Google Patents
Circular polarized light detector Download PDFInfo
- Publication number
- CN111982290A CN111982290A CN202010837357.0A CN202010837357A CN111982290A CN 111982290 A CN111982290 A CN 111982290A CN 202010837357 A CN202010837357 A CN 202010837357A CN 111982290 A CN111982290 A CN 111982290A
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- Prior art keywords
- polarized light
- circularly polarized
- substrate
- light detector
- sensitive part
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- 239000000758 substrate Substances 0.000 claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910021389 graphene Inorganic materials 0.000 claims description 6
- 230000000737 periodic effect Effects 0.000 claims description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 3
- 229910000510 noble metal Inorganic materials 0.000 claims description 3
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000006096 absorbing agent Substances 0.000 claims 1
- 239000006098 acoustic absorber Substances 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 10
- 238000010521 absorption reaction Methods 0.000 description 11
- 239000013598 vector Substances 0.000 description 8
- 238000010897 surface acoustic wave method Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000002198 surface plasmon resonance spectroscopy Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J4/00—Measuring polarisation of light
- G01J4/04—Polarimeters using electric detection means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The invention relates to a circularly polarized light detector, which comprises an input electrode, a sensitive part, an output electrode and a substrate; the input electrode, the sensitive part and the output electrode are arranged on the substrate, and the sensitive part is arranged between the input electrode and the output electrode; the sensitive part is composed of a plurality of chiral structures which are arranged periodically, and the substrate is made of a piezoelectric material. The invention detects the circularly polarized light by different frequency drifts of the electric signals output by the output electrodes due to different absorbed heat of the sensitive parts under the irradiation of different circularly polarized light, and has simple structure, low cost and high detection precision.
Description
Technical Field
The invention relates to the technical field of circularly polarized light detection, in particular to a circularly polarized light detector.
Background
Polarized light is a light wave in which the direction of vibration of the light vector is constant or varies with some regularity. According to its properties, polarized light can be divided into plane polarized light (linearly polarized light), circularly polarized light, and partially polarized light. If the vibration direction of the light wave vector is limited to a certain plane, the polarized light is called plane polarized light, and the vibration direction is a straight line in the transmission process, so the polarized light is also called linearly polarized light. Circular polarized light is called if the light wave electric vector changes regularly with time, i.e. the electric vector end trajectory is circular or elliptical in a plane perpendicular to the propagation direction. If the vibration of the light wave electric vector is dominant in a certain direction during the propagation process, the polarized light is called partial polarized light. In many applications, it is necessary to detect the circular polarization component in the polarized light, for example, when a radar is used for target identification, the circular polarization detection can be used to improve the identification efficiency.
The method of detecting Stokes (Stokes) vectors is a commonly used method for optical polarization detection. The Stokes vector is able to fully describe the polarization properties of light, including natural light that is unpolarized. The acquisition of this vector needs to involve 4 independent units whose roles are: transmitting only half the transmission of light; transmitting only X-axis polarized light; transmitting only Y-axis polarized light; transmitting only right-handed polarized light; where the Z-axis is the direction of propagation of the light. The adoption of a plurality of independent units with different functions not only has complex structure and high cost, but also has low detection precision.
Disclosure of Invention
The invention aims to provide a circularly polarized light detector which is simple in structure, low in cost and high in detection precision.
In order to achieve the purpose, the invention provides the following scheme:
a circularly polarized light detector comprises an input electrode, a sensitive part, an output electrode and a substrate; the input electrode, the sensitive part and the output electrode are arranged on the substrate, and the sensitive part is arranged between the input electrode and the output electrode; the sensitive part is composed of a plurality of chiral structures which are arranged periodically, and the substrate is made of a piezoelectric material.
Optionally, the substrate further comprises a sound absorption part, and the substrate is arranged on the sound absorption part.
Optionally, the absorption portion is a graphene film with periodic holes.
Optionally, the sensor further comprises an enhancement layer, and the enhancement layer is arranged on the sensitive part.
Optionally, the optical device further includes a second enhancement layer disposed on each of the chiral structures and between each of the chiral structures on the substrate.
Optionally, the material of the reinforcing layer and the second reinforcing layer is a two-dimensional material.
Optionally, the two-dimensional material is graphene, molybdenum disulfide, tungsten disulfide, or black phosphorus.
Optionally, the input electrode and the output electrode are both interdigital electrodes.
Optionally, the chiral structure is L-shaped or S-shaped.
Optionally, the material of the sensitive part is noble metal.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a circularly polarized light detector, which comprises an input electrode, a sensitive part, an output electrode and a substrate, wherein the input electrode is arranged on the substrate; the input electrode, the sensitive part and the output electrode are arranged on the substrate, and the sensitive part is arranged between the input electrode and the output electrode; the sensitive part is composed of a plurality of chiral structures which are arranged periodically, and the substrate is made of a piezoelectric material. The invention detects the circularly polarized light by different frequency drifts of the electric signals output by the output electrodes due to different absorbed heat of the sensitive parts under the irradiation of different circularly polarized light, and has simple structure, low cost and high detection precision.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a structural diagram of a circularly polarized light detector according to an embodiment of the present invention;
fig. 2 is a top view of a circularly polarized light detector according to an embodiment of the present invention;
FIG. 3 is a block diagram of a detector provided with an enhancement layer according to an embodiment of the present invention;
fig. 4 is a structural diagram of a detector provided with a second enhancement layer according to an embodiment of the present invention.
Description of the symbols: 1-substrate, 21-input electrode, 22-output electrode, 3-sensitive part, 4-sound absorbing part, 5-enhancement layer, 6-second enhancement layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a circularly polarized light detector which is simple in structure, low in cost and high in detection precision.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1
Fig. 1 is a structural diagram of a circularly polarized light detector according to an embodiment of the present invention, and fig. 2 is a top view of a circularly polarized light detector according to an embodiment of the present invention, as shown in fig. 1 and fig. 2, the detector includes an input electrode 21, a sensitive portion 3, an output electrode 22, and a substrate 1. The input electrode 21, the sensitive part 2 and the output electrode 22 are disposed on the substrate 1, and the sensitive part 3 is disposed between the input electrode 21 and the output electrode 22. The sensitive part 3 is composed of a plurality of chiral structures which are arranged periodically, and the material of the substrate 1 is piezoelectric material.
In this embodiment, the input electrode 21 and the output electrode 22 are both interdigital electrodes made of conductive metal, and the two electrodes can interact with the substrate 1 to realize sound-electricity interchange, so as to excite and detect surface acoustic waves. Specifically, the conductive metal is any one of gold, copper, and aluminum, or an alloy of any two of them.
In the present embodiment, the material of the sensitive part 3 is a noble metal, specifically gold or silver. The chiral structure is a planar chiral structure and is L-shaped or S-shaped.
In the present embodiment, the piezoelectric material is a quartz crystal or a lithium niobate crystal. The piezoelectric material is used for generating a piezoelectric effect, on one hand, surface acoustic wave transmission is carried out on the surface of the substrate 1, and on the other hand, the piezoelectric material interacts with the two electrodes to realize mutual conversion of electric signals and surface acoustic wave signals, so that the two electrodes can excite and receive the surface acoustic waves.
The detector has the following principle:
when an excitation signal is applied to the input electrode 21, a surface acoustic wave is generated on the surface of the substrate 1, and the surface acoustic wave passes through the sensitive part 3 in the process of propagation. The sensitive part 3 is irradiated by circularly polarized light to be detected, and a periodic plane chiral metal structure in the sensitive part 3 generates surface plasmon resonance on the surface thereof under the excitation of the circularly polarized light to absorb heat, so that the surface temperature of the sensitive part 3 is increased, and thus material parameters of the substrate 1 are changed, the surface acoustic wave propagating along the surface of the substrate 1 is changed, and the frequency of an electric signal output by the output electrode 22 is shifted. Under excitation of left-handed circularly polarized light and right-handed circularly polarized light, the chiral structure absorbs different amounts of heat, and finally, the frequency drift of the electrical signal output by the output electrode 22 is different. The detection of the circularly polarized light is achieved by detecting the frequency of the electrical signal output by the output electrode 22.
Further, the detector also comprises an acoustic absorption part 4, and the substrate 1 is arranged on the absorption part 4. Specifically, the absorption portion 4 is a graphene film having periodic pores. The absorption part 4 can absorb the sound wave at the bottom of the substrate 1, reduce the reflection of the sound wave of the substrate 1 and further improve the measurement precision of the detector.
Further, the detector also comprises an enhancement layer 5 or a second enhancement layer 6. The enhancement layer 5 is arranged on the sensitive part 3, as shown in fig. 3, the enhancement layer 5 is tiled on the sensitive part 3, so that the absorption capacity of the sensitive part 3 to circularly polarized light to be detected can be enhanced, and the measurement accuracy of the detector is improved. The second enhancement layer 6 is disposed on each chiral structure and between each chiral structure on the substrate 1, and can be sputtered on the sensitive portion 3 by a magnetron sputtering method. As shown in fig. 4, the contact area between the second enhancement layer 6 and each chiral structure can be increased, the absorption capability of the sensitive portion 3 on circularly polarized light to be measured is further enhanced, more heat is generated, and the measurement accuracy of the detector is further improved. Specifically, the enhancement layer 5 and the second enhancement layer 6 are two-dimensional materials, specifically graphene, molybdenum disulfide, tungsten disulfide, or black phosphorus.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
(1) the invention detects the circularly polarized light by different frequency drifts of the electric signals output by the output electrodes due to different absorbed heat of the sensitive part under the irradiation of different circularly polarized light, and has high detection precision.
(2) The detector is only provided with the substrate, the input electrode, the output electrode and the sensitive part, and has simple structure and low manufacturing cost.
(3) The invention is provided with the absorption part which can absorb the sound wave at the bottom of the substrate, thereby reducing the reflection of the sound wave of the substrate and improving the measurement precision of the detector.
(4) The enhancement layer or the second enhancement layer is arranged in the invention, so that the absorption capacity of the sensitive part to circularly polarized light to be detected can be enhanced, and the measurement precision of the detector is further improved.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist in understanding the core concepts of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A circular polarized light detector is characterized by comprising an input electrode, a sensitive part, an output electrode and a substrate; the input electrode, the sensitive part and the output electrode are arranged on the substrate, and the sensitive part is arranged between the input electrode and the output electrode; the sensitive part is composed of a plurality of chiral structures which are arranged periodically, and the substrate is made of a piezoelectric material.
2. The circularly polarized light detector of claim 1, further comprising an acoustic absorber, the substrate being disposed on the absorber.
3. The circularly polarized light detector according to claim 2, wherein the absorbing part is a graphene film having periodic holes.
4. The circularly polarized light detector of claim 1, further comprising an enhancement layer disposed on the sensitive portion.
5. The circularly polarized light detector of claim 1, further comprising a second enhancement layer disposed on each of the chiral structures and between each of the chiral structures on the substrate.
6. Circularly polarized light detector according to claim 5, characterized in that the material of the enhancement layer and the second enhancement layer is a two-dimensional material.
7. The circularly polarized light detector of claim 6, wherein the two-dimensional material is graphene, molybdenum disulfide, tungsten disulfide, or black phosphorus.
8. The circularly polarized light detector of claim 1, wherein the input electrodes and the output electrodes are interdigital electrodes.
9. Circularly polarized light detector according to claim 1, characterized in that the chiral structure is L-shaped or S-shaped in shape.
10. Circularly polarized light detector according to claim 1, characterized in that the material of the sensitive part is a noble metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010837357.0A CN111982290A (en) | 2020-08-19 | 2020-08-19 | Circular polarized light detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010837357.0A CN111982290A (en) | 2020-08-19 | 2020-08-19 | Circular polarized light detector |
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| Publication Number | Publication Date |
|---|---|
| CN111982290A true CN111982290A (en) | 2020-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010837357.0A Withdrawn CN111982290A (en) | 2020-08-19 | 2020-08-19 | Circular polarized light detector |
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| CN (1) | CN111982290A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116895704A (en) * | 2023-09-11 | 2023-10-17 | 长春理工大学 | Detector capable of detecting and identifying chiral light field and preparation method thereof |
| RU2805784C1 (en) * | 2023-04-17 | 2023-10-24 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский государственный университет" (СПбГУ)" | Infrared detector of circularly polarized radiation based on graphene |
| WO2023195926A3 (en) * | 2022-04-05 | 2023-11-16 | National University Of Singapore | Circularly polarized light detectors |
-
2020
- 2020-08-19 CN CN202010837357.0A patent/CN111982290A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023195926A3 (en) * | 2022-04-05 | 2023-11-16 | National University Of Singapore | Circularly polarized light detectors |
| RU2805784C1 (en) * | 2023-04-17 | 2023-10-24 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский государственный университет" (СПбГУ)" | Infrared detector of circularly polarized radiation based on graphene |
| CN116895704A (en) * | 2023-09-11 | 2023-10-17 | 长春理工大学 | Detector capable of detecting and identifying chiral light field and preparation method thereof |
| CN116895704B (en) * | 2023-09-11 | 2023-11-24 | 长春理工大学 | Detector capable of detecting and identifying chiral light field and preparation method thereof |
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Application publication date: 20201124 |