CN108665909B - Phase plate and device in miniaturized double-beam super-resolution optical storage optical path system - Google Patents
Phase plate and device in miniaturized double-beam super-resolution optical storage optical path system Download PDFInfo
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- CN108665909B CN108665909B CN201810443115.6A CN201810443115A CN108665909B CN 108665909 B CN108665909 B CN 108665909B CN 201810443115 A CN201810443115 A CN 201810443115A CN 108665909 B CN108665909 B CN 108665909B
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
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Abstract
The invention discloses a phase plate and a device in a miniaturized double-beam super-resolution optical storage optical path system, which relate to the field of the miniaturized double-beam super-resolution optical storage optical path system and are characterized by comprising two transparent materials with different refractive indexes which are spliced by a specific structure, when write-in induction recording light and write-in inhibition recording light simultaneously pass through the phase plate, the phase of the write-in induction recording light does not change along with the space position on a plane vertical to the propagation direction, the phases of the write-in inhibition recording light are correspondingly distributed along with the height of the phase plate at different positions, the phase plate acts on two different wavelengths, when circularly polarized light enters the phase plate and is focused by an objective lens, the write-in induction recording light can be focused into a solid light spot, and the write-in inhibition recording light can be focused into a hollow light spot, the phase modulation is performed only on the write-inhibition recording light, and the phase of the write-induction recording light is kept unchanged.
Description
Technical Field
The invention relates to the field of a miniaturized double-beam super-resolution optical storage optical path system, in particular to a phase plate and a device in the miniaturized double-beam super-resolution optical storage optical path system.
Background
The two-beam super-resolution data storage technology is different from the traditional optical storage technology, the technology utilizes two beams of light to read and write simultaneously, and the basic principle is similar to the super-resolution fluorescence imaging technology of the 2014 Nobel chemical prize. In the process of data writing, one beam of light is used as recording light; the other beam of light modulated by the phase plate has the characteristic of hollow light intensity distribution, and can generate an erasing effect on a storage medium to inhibit the process of optical recording. Therefore, the double-beam optical storage mode can realize the super-resolution recording spot size, thereby greatly improving the information storage density of a single optical disc.
In a conventional STED microscope, which is composed of an excitation light (Exc) optical path and a loss light (STED) optical path, optical path alignment is required so that the spot center of the excitation light and the annular spot center of the loss light are aligned, and thus the resolution of the STED microscope can be improved. Due to changes of objective factors such as mechanical vibration and temperature, the collimation of the light path and the coincidence degree of the two light spots are influenced, and therefore the resolution ratio is influenced.
Therefore, those skilled in the art have made an effort to develop a novel phase plate for miniaturized two-beam super-resolution optical storage, which performs phase modulation only on write-suppressing recording light (read-out loss light) while keeping the phase of write-inducing recording light (read-out excitation light) constant.
Disclosure of Invention
In view of the above-described drawbacks of the prior art, the present invention is directed to a phase plate that modulates the phase of write-suppressed recording light (read-loss light) and affects the phase of write-induced recording light (read excitation light).
In order to achieve the above object, the present invention provides a phase plate in a miniaturized dual-beam super-resolution optical storage optical path system, comprising two transparent materials with different refractive indexes spliced together by a specific structure, wherein when write-induced recording light and write-suppressed recording light pass through the phase plate simultaneously, the phase of the write-induced recording light does not change with the spatial position on a plane perpendicular to the propagation direction, while the phase of the write-suppressed recording light shows corresponding distribution with the height of the phase plate at different positions, the phase plate acts on two different wavelengths, and after circularly polarized light enters the phase plate and is focused by an objective lens, the write-induced recording light can be focused into a solid spot and the write-suppressed recording light can be focused into a hollow spot.
Further, the phase distribution of the phase plate is in a double slope shape or a spiral shape, the phase distribution function is determined by the height of the phase plate, and the function expression is as follows:
wherein L is the height of the material in a predetermined direction, and Δ n is the difference between the refractive indices of the two materials at the wavelength of the write-inhibit recording light
Further, said phase plate is a cylinder, the height is determined by the difference in refractive index between said write-inhibit recording light and said wavelength at two transparent said materials, and the wedge angle is determined by the diameter and the height of said cylinder,
wherein H is the maximum height of the phase plate, and d is the diameter of the phase plate.
Further, the write inducing recording light and the write suppressing recording light are overlapped on a plane perpendicular to a light propagation direction before entering the phase plate, and incident diameters of the two lights match a diameter of the phase plate.
Further, when the phase plate is applied, the excitation wavelength of a readout light path can be 405nm to 650nm, and the loss wavelength can be 375nm to 793 nm.
Further, when the phase plate is applied, the excitation wavelength adopted by a reading light path is 405nm, and the loss wavelength is 488 nm; the excitation wavelength is 440nm, and the loss wavelength is 532 nm; the excitation wavelength is 440nm, and the loss wavelength is 676 nm; the excitation wavelength is 470nm, and the loss wavelength is 568 nm; the excitation wavelength is 470nm, and the loss wavelength is 603 nm; a combination of an excitation wavelength of 470nm and a loss wavelength of 615 nm; a combination of excitation wavelength of 470nm and loss wavelength of 647 nm; a combination of excitation wavelength of 488nm and loss wavelength of 592 nm; the excitation wavelength is 488nm, and the loss wavelength is 600 nm; the excitation wavelength is 488nm, and the loss wavelength is 602 nm; the excitation wavelength is 488nm, and the loss wavelength is 615 nm; a combination of excitation wavelength 488nm and loss wavelength 647 nm; excitation wavelength is 490nm, loss wavelength is 575nm combination; excitation wavelength is 490nm, loss wavelength is 598nm combination; the excitation wavelength is 500nm, and the loss wavelength is 600 nm; the excitation wavelength is 512nm, and the loss wavelength is 605 nm; a combination of excitation wavelength of 532nm and loss wavelength of 647 nm; the excitation wavelength is 532nm, and the loss wavelength is 650 nm; the excitation wavelength is 532nm, and the loss wavelength is 660 nm; a combination of an excitation wavelength of 532nm and a loss wavelength of 750 nm; a combination of excitation wavelength of 532nm and loss wavelength of 775 nm; the excitation wavelength is 532nm, and the loss wavelength is 793 nm; a combination of an excitation wavelength of 552nm and a loss wavelength of 655 nm; a combination of an excitation wavelength of 554nm and a loss wavelength of 745 nm; the excitation wavelength is 554nm, and the loss wavelength is 760 nm; the excitation wavelength is 570nm, and the loss wavelength is 690 nm; the excitation wavelength is 595nm and the loss wavelength is 775 nm; the excitation wavelength is 630nm and the loss wavelength is 735 nm; the excitation wavelength is 635nm, and the loss wavelength is 745 nm; the excitation wavelength is 635nm, and the loss wavelength is 750 nm; the excitation wavelength is 635nm, and the loss wavelength is 775 nm; the excitation wavelength is 635nm, and the loss wavelength is 780 nm; the excitation wavelength is 635nm, and the loss wavelength is 781 nm; the excitation wavelength is 637nm, and the loss wavelength is 778 nm; the excitation wavelength is 640nm, and the loss wavelength is 750 nm; the excitation wavelength is 640nm, and the loss wavelength is 760 nm; the excitation wavelength is 640nm, and the loss wavelength is 775 nm; the excitation wavelength is 650nm, and the loss wavelength is 755 nm; the excitation wavelength is 488nm, and the loss wavelength is 375 nm.
the Schottky optical circuit comprises a Schottky optical unit, a No optical unit, a No. 10, No. 5, No. 5, No. 5.
Further, two different transparent materials are bonded in a double slope shape.
Further, two different said transparent materials are bonded in a spiral.
In order to achieve the above object, the present invention provides a phase plate device, including the above phase plate, wherein the main structure of the phase plate is a double-slope or spiral shape.
The technical effects are as follows: a novel phase plate is provided which phase-modulates only write-suppressing recording light (read-loss light) and keeps the phase of write-inducing recording light (read-excitation light) unchanged.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a phase plate based on material dispersion curves and capable of wavelength selection according to a preferred embodiment of the present invention;
FIG. 2 is a phase distribution diagram of a ramp-shaped phase plate according to a preferred embodiment of the present invention;
FIG. 3 is a phase distribution diagram of the helical phase plate according to a preferred embodiment of the present invention;
FIG. 4 is a diagram showing the modulation of the writing-suppression recording light (readout-loss light) spot according to a preferred embodiment of the present invention;
FIG. 5 is a perspective view of a dual ramp phase plate of a material in accordance with a preferred embodiment of the present invention;
FIG. 6 is a perspective view of a two material dual ramp phase plate splice of a preferred embodiment of the present invention;
FIG. 7 is a perspective view of a helical phase plate of a material in accordance with a preferred embodiment of the present invention;
fig. 8 is a perspective view of a two material helical phase plate splice of a preferred embodiment of the present invention.
Wherein: lambda [ alpha ]excWrite-induced recording light wavelength, λSTEDWrite inhibit recording light wavelength, height of the L-A material in z-direction,
phase shift, α -wedge angle.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.
As shown in fig. 1, a phase plate according to the present invention is composed of two transparent materials having different refractive indexes, which are combined by a specific structure, and when write-induced recording light and write-suppressed recording light (read excitation light and read loss light) pass through the phase plate simultaneously, the phase of the write-induced recording light (read excitation light) does not change with the spatial position (x, y) on a plane perpendicular to the propagation direction, and the phase of the write-suppressed recording light (read loss light) shows a corresponding distribution with the height of the phase plate at different (x, y) positions. The phase plate acts on two different wavelengths, and after circularly polarized light enters the phase plate and is focused by an objective lens, it is possible to focus write induction recording light (read excitation light) into a solid spot and write inhibition recording light (read loss light) into a hollow spot.
One phase plate according to the present invention is a cylinder, the height is determined by the difference between the refractive indices of the two transparent materials at different write-inhibit recording lights (read-out loss lights) and the wavelength, and the wedge angle is determined by the diameter and height of the cylinder.
Where H is the maximum height of the phase plate and d is the diameter of the phase plate, as shown in fig. 4.
In another phase plate according to the present invention, the phase distribution of the phase plate is a double slope as shown in fig. 5 and 6, or a spiral as shown in fig. 7 and 8. The phase plate obtains its wavelength selective effect by the combination of two optical media having refractive indices in the write-induced recording light (readout excitation light) λexcEqual in spot size but suppresses recording light (read loss light) λ during writingSTEDThe above is significantly different. The relationship between the phase retardation and the size of the phase plate can be derived from this:
where L is the height of the material a in fig. 1 in the z direction, and Δ n is the difference in refractive index between the two materials at the wavelength of the write-suppressing recording light (read-out loss light).
In the phase plate device of the present invention, the main structure of the phase plate may be a double-slope shape, the phase distribution of which is shown in fig. 2, and the shape structure of which is shown in fig. 5.
In another phase plate device of the present invention, the main structure of the phase plate can be a spiral shape, the phase distribution is shown in fig. 3, and the shape structure of the phase plate is shown in fig. 7. In which the phase plates are bonded in a double ramp as shown in fig. 6 or in a spiral as shown in fig. 8.
According to the following formula:
in the formula, B1-B3And C1-C3The dispersion coefficient is 20 ℃ temperature, and lambda is the wavelength of incident light.
The refractive index is the same at the wavelength of the write-induced recording light (readout excitation light), but the refractive index difference Δ n is large at the wavelength of the recording light (readout loss light) to be suppressed.
When the phase plate is applied, in a reading light path, the combination of the excitation light wavelength and the loss light wavelength is as follows: the excitation wavelength is 405nm, and the loss wavelength is 488 nm; the excitation wavelength is 440nm, and the loss wavelength is 532 nm; the excitation wavelength is 440nm, and the loss wavelength is 676 nm; the excitation wavelength is 470nm, and the loss wavelength is 568 nm; the excitation wavelength is 470nm, and the loss wavelength is 603 nm; a combination of an excitation wavelength of 470nm and a loss wavelength of 615 nm; a combination of excitation wavelength of 470nm and loss wavelength of 647 nm; a combination of excitation wavelength of 488nm and loss wavelength of 592 nm; the excitation wavelength is 488nm, and the loss wavelength is 600 nm; the excitation wavelength is 488nm, and the loss wavelength is 602 nm; the excitation wavelength is 488nm, and the loss wavelength is 615 nm; a combination of excitation wavelength 488nm and loss wavelength 647 nm; excitation wavelength is 490nm, loss wavelength is 575nm combination; excitation wavelength is 490nm, loss wavelength is 598nm combination; the excitation wavelength is 500nm, and the loss wavelength is 600 nm; the excitation wavelength is 512nm, and the loss wavelength is 605 nm; a combination of excitation wavelength of 532nm and loss wavelength of 647 nm; the excitation wavelength is 532nm, and the loss wavelength is 650 nm; the excitation wavelength is 532nm, and the loss wavelength is 660 nm; a combination of an excitation wavelength of 532nm and a loss wavelength of 750 nm; a combination of excitation wavelength of 532nm and loss wavelength of 775 nm; the excitation wavelength is 532nm, and the loss wavelength is 793 nm; a combination of an excitation wavelength of 552nm and a loss wavelength of 655 nm; a combination of an excitation wavelength of 554nm and a loss wavelength of 745 nm; the excitation wavelength is 554nm, and the loss wavelength is 760 nm; the excitation wavelength is 570nm, and the loss wavelength is 690 nm; the excitation wavelength is 595nm and the loss wavelength is 775 nm; the excitation wavelength is 630nm and the loss wavelength is 735 nm; the excitation wavelength is 635nm, and the loss wavelength is 745 nm; the excitation wavelength is 635nm, and the loss wavelength is 750 nm; the excitation wavelength is 635nm, and the loss wavelength is 775 nm; the excitation wavelength is 635nm, and the loss wavelength is 780 nm; the excitation wavelength is 635nm, and the loss wavelength is 781 nm; the excitation wavelength is 637nm, and the loss wavelength is 778 nm; the excitation wavelength is 640nm, and the loss wavelength is 750 nm; the excitation wavelength is 640nm, and the loss wavelength is 760 nm; the excitation wavelength is 640nm, and the loss wavelength is 775 nm; the excitation wavelength is 650nm and the loss wavelength is 755 nm.
table 1 shows the types of transparent materials, the height of the phase plate (for example, the diameter of the phase plate is 5.6 mm), and the wedge angle α, which are used for different combinations of the excitation wavelength and the loss wavelength.
TABLE 1 type of transparent material (refer to Schottky glass, Germany) used for different combinations of excitation and loss wavelengths, phase plate height (for example, phase plate diameter of 5.6 mm), and wedge angle α.
In the present invention, the phase plate diameter d is set to 5.6mm as an example, and d may be set to other values. According to the wavelength selection of different write-induced recording light (read-out exciting light) and write-inhibited recording light (read-out loss light), two transparent materials selected by the phase plate are determined, and the selection method comprises the following steps: the refractive indices of the two transparent materials are the same at the wavelength of the write-induced recording light (readout excitation light); there is a difference in the refractive index of the two transparent materials at the wavelength of the write-inhibit recording light (the read-out loss light), and this difference in refractive index needs to be maximized and optimized in all other alternative glass material combinations.
in practice, the phase plate structure is a double ramp or spiral, requiring two phase plates of transparent material to be bonded without a gap.
for example, the glass materials were Schottky N-LAF21 and N-SF14. with a wedge angle α of 8' 31.8 "when the excitation wavelength was 405nm and the loss wavelength was 488 nm.
In the specific implementation process, the glass material produced by Duguang photoelectricity corporation can be adopted due to the difficulty of limiting the supply, the process and the like of the glass material. Table 2 shows that the glass brand of part of the german schottky company is interchangeable with the glass brand of chenguangming photonics ltd.
Table 2: glass brand interchange table of part German Schottky company and Chengdu Guangming photoelectricity corporation
Before the write-induced recording light (read-out exciting light) and the write-suppressed recording light (read-out loss light) pass through the phase plate, the two light paths need to be aligned and superposed into the same light path, so that the light path can be kept stable after the two modulated light beams pass through the phase plate under the change of environmental vibration, temperature and the like.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A phase plate in a miniaturized double-beam super-resolution optical storage optical path system is characterized by comprising two transparent materials with different refractive indexes which are spliced through a specific structure, when write-induced recording light and write-inhibition recording light simultaneously pass through the phase plate, the phase of the write-induced recording light does not change along with the spatial position on a plane perpendicular to the propagation direction, the phase of the write-inhibition recording light presents corresponding distribution along with the height of the phase plate at different positions, the phase plate acts on two different wavelengths, and after circularly polarized light enters the phase plate and is focused through an objective lens, the write-induced recording light can be focused into a solid light spot, and the write-inhibition recording light can be focused into a hollow light spot.
2. The miniaturized dual-beam super-resolution optical storage beam system as claimed in claim 1, wherein the phase plate has a phase distribution with a double slope or a spiral shape, and the phase distribution function is determined by the height of the phase plate, and the expression of the phase distribution function is:
wherein L is a height of the transparent material in a predetermined direction, and Δ n is a difference in refractive index between the two transparent materials at the write-inhibit recording light wavelength.
3. The phase plate in a miniaturized two-beam super-resolution optical storage optical path system according to claim 2, wherein said phase plate is a cylinder having a height determined by a difference in refractive index between two said transparent materials at different wavelengths of said write inhibit recording light and said write inhibit recording light, and a wedge angle determined by a diameter and a height of said cylinder,
wherein H is the maximum height of the phase plate, and d is the diameter of the phase plate.
4. The phase plate in a miniaturized dual-beam super-resolution optical storage optical path system as claimed in claim 2, wherein said write induction recording light and said write suppression recording light are overlapped on a plane perpendicular to a light propagation direction before entering said phase plate, and an incident diameter of said two lights is matched with a diameter of the phase plate.
5. The phase plate of claim 2, wherein the phase plate has an excitation wavelength of 405nm to 650nm and a loss wavelength of 375nm to 793 nm.
6. The phase plate in a miniaturized dual-beam super-resolution optical storage beam path system as claimed in claim 5, wherein the phase plate is applied with a combination of an excitation wavelength of 405nm and a loss wavelength of 488nm for a readout beam path; the excitation wavelength is 440nm, and the loss wavelength is 532 nm; the excitation wavelength is 440nm, and the loss wavelength is 676 nm; the excitation wavelength is 470nm, and the loss wavelength is 568 nm; the excitation wavelength is 470nm, and the loss wavelength is 603 nm; a combination of an excitation wavelength of 470nm and a loss wavelength of 615 nm; a combination of excitation wavelength of 470nm and loss wavelength of 647 nm; a combination of excitation wavelength of 488nm and loss wavelength of 592 nm; the excitation wavelength is 488nm, and the loss wavelength is 600 nm; the excitation wavelength is 488nm, and the loss wavelength is 602 nm; the excitation wavelength is 488nm, and the loss wavelength is 615 nm; a combination of excitation wavelength 488nm and loss wavelength 647 nm; excitation wavelength is 490nm, loss wavelength is 575nm combination; excitation wavelength is 490nm, loss wavelength is 598nm combination; the excitation wavelength is 500nm, and the loss wavelength is 600 nm; the excitation wavelength is 512nm, and the loss wavelength is 605 nm; a combination of excitation wavelength of 532nm and loss wavelength of 647 nm; the excitation wavelength is 532nm, and the loss wavelength is 650 nm; the excitation wavelength is 532nm, and the loss wavelength is 660 nm; a combination of an excitation wavelength of 532nm and a loss wavelength of 750 nm; a combination of excitation wavelength of 532nm and loss wavelength of 775 nm; the excitation wavelength is 532nm, and the loss wavelength is 793 nm; a combination of an excitation wavelength of 552nm and a loss wavelength of 655 nm; a combination of an excitation wavelength of 554nm and a loss wavelength of 745 nm; the excitation wavelength is 554nm, and the loss wavelength is 760 nm; the excitation wavelength is 570nm, and the loss wavelength is 690 nm; the excitation wavelength is 595nm and the loss wavelength is 775 nm; the excitation wavelength is 630nm and the loss wavelength is 735 nm; the excitation wavelength is 635nm, and the loss wavelength is 745 nm; the excitation wavelength is 635nm, and the loss wavelength is 750 nm; the excitation wavelength is 635nm, and the loss wavelength is 775 nm; the excitation wavelength is 635nm, and the loss wavelength is 780 nm; the excitation wavelength is 635nm, and the loss wavelength is 781 nm; the excitation wavelength is 637nm, and the loss wavelength is 778 nm; the excitation wavelength is 640nm, and the loss wavelength is 750 nm; the excitation wavelength is 640nm, and the loss wavelength is 760 nm; the excitation wavelength is 640nm, and the loss wavelength is 775 nm; the excitation wavelength is 650nm, and the loss wavelength is 755 nm; the excitation wavelength is 488nm, and the loss wavelength is 375 nm.
7. the phase plate in the miniaturized dual-beam super-resolution optical storage optical path system as claimed in claim 6, wherein the phase plate has two different wavelengths, when the phase plate has a 5-35-60-35-60-10-60-10-60-10-60-10-35-10-35-10-35-10-35-10-35-10-.
8. A miniaturized dual beam super resolution optical storage beam path as in claim 2 wherein two different said transparent materials are bonded in a double slope.
9. A miniaturized dual beam super resolution optical storage beam path as in claim 2 wherein two different said transparent materials are bonded in a spiral.
10. A phase plate device, comprising the miniaturized dual-beam super-resolution optical storage optical path system of claim 2, wherein the phase plate has a dual-slope or spiral structure.
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| CN102141690A (en) * | 2011-05-05 | 2011-08-03 | 西北工业大学 | Spiral phase plate with adjustable parameters |
| CN103257130A (en) * | 2013-05-31 | 2013-08-21 | 中国科学院苏州生物医学工程技术研究所 | Stimulated radiation loss micro imaging system |
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