CN111999904A - Device for generating super-chiral optical field - Google Patents
Device for generating super-chiral optical field Download PDFInfo
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- CN111999904A CN111999904A CN202010872414.9A CN202010872414A CN111999904A CN 111999904 A CN111999904 A CN 111999904A CN 202010872414 A CN202010872414 A CN 202010872414A CN 111999904 A CN111999904 A CN 111999904A
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Abstract
The invention discloses a device and a method for generating a super-chiral optical field. The device comprises a beam expanding collimation system, a radial polarization first-order vortex light beam generation system and a super-chiral light field generation system; the laser output beam generates a linear polarization beam through a beam expanding collimation system, then generates a radial polarization first-order vortex beam through an 1/4 wave plate, a radial polarizer and a spiral phase plate, then is tightly focused on the last layer of interface of the one-dimensional photonic crystal by a high numerical aperture objective lens after limiting a certain incident angle through a circular diaphragm, and generates a super-chiral optical field with an asymmetric factor higher than that of common circular polarization on the surface of the one-dimensional photonic crystal. The invention has simple light path and strong performance, and has important application prospect in a series of fields relating to chiral optics.
Description
Technical Field
The invention relates to the technical field of micro-nano optics, in particular to a device for generating a super-chiral optical field.
Background
Chirality describes the structural features of a three-dimensional object that cannot be coincident with its mirror image by translation and rotation. Chirality is closely related to the human body, and genetic materials, enzymes, molecules constituting cells, etc. in the body of a living body often have chirality. Objects of opposite chirality, called enantiomers, are equivalent in their scalar physical properties, but often are quite different in chemical properties, and they can only be distinguished upon interaction with a chiral species. For biological molecules, molecules with different chiralities have different cytotoxicity, so that the detection of chiral substances has very important application in the fields of medicinal medicine, biochemistry, biocatalysis and the like.
Circularly polarized light is the most common chiral optical field, and under excitation of circularly polarized light with different handedness, the absorptivity of chiral molecules is different, and the absorption of the circularly polarized light with left rotation is A1Absorption of right-handed circularly polarized light is A2This optically active phenomenon is called circular dichroism, and the degree of absorption difference can be determined by a chiral asymmetry factor g of 2 (a)1-A2)/(A1+A2) The positive and negative of g represent the chiral direction of the chiral molecules, and the absolute value represents the chiral size of the chiral molecules. Meanwhile, the asymmetric factor is not only related to chiral molecules, but also closely related to the chirality of the optical field. Therefore, the acquisition of stronger asymmetric factors by exciting the optical field chirality plays an important role in circular dichroism detection, namely, the distinction of chiral molecules, and a high-precision and non-contact type tool for detecting the chiral molecules is provided for various fields of biology, physics, chemistry and the like.
Initially, researchers discovered that a super-chiral optical field could be generated at the node of the standing wave induced by two mutually opposite-chiral coherent circularly polarized light beams, but the thickness of the super-chiral region is very small, which brings difficulty to further detection of chiral molecules. In recent years, researchers find that by means of space engineering of a complex optical field, an optical field with an asymmetric factor larger than that of a common circularly polarized optical field, namely a super-chiral optical field, can be obtained by regulating the amplitude of an electromagnetic field and the distribution of the electromagnetic field in space. When the hyper-chiral optical field interacts with the chiral molecules, the electric dipole-magnetic dipole mixed transition mechanism of the chiral molecules is enhanced, and the pure electric dipole level transition is inhibited, so that the improvement of circular dichroism signals is facilitated. However, none of the existing techniques for generating a super-chiral optical field has a sufficiently high asymmetry factor.
Disclosure of Invention
In order to solve the problems, the invention discloses a device for generating a super-chiral optical field, which obtains asymmetric factor distribution stronger than that of a common circularly polarized optical field.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
a device for generating a super-chiral optical field comprises a beam expanding collimation system, a radial polarization first-order vortex light beam generation system and a super-chiral optical field generation system; the beam expanding collimation system comprises a concave lens and a convex lens which are sequentially arranged, the radial polarization first-order vortex light beam generation system comprises an 1/4 wave plate, a radial polaroid and a spiral phase plate which are sequentially arranged, and the super-chiral light field generation system comprises a circular diaphragm, a high-numerical-aperture objective lens and a one-dimensional photonic crystal which are sequentially arranged; a medium matching oil solution is contained between the high numerical aperture objective lens and the one-dimensional photonic crystal; the other surface of the one-dimensional photonic crystal comprises a medium aqueous solution;
laser beams output by a laser are sequentially expanded and collimated by a concave lens and a convex lens, then are incident to an 1/4 wave plate and are converted into circularly polarized light by linearly polarized light, then are converted into radially polarized light by a radial polarizer, then are converted into radially polarized first-order vortex light by a spiral phase plate, the radially polarized first-order vortex light carrying phase information is subjected to spatial filtering by a circular diaphragm, then the limited light beams are tightly focused on the last layer of interface of the one-dimensional photonic crystal by a high-numerical-aperture objective lens, and a super-chiral light field with an asymmetric factor higher than that of common circular polarization is generated in a medium aqueous solution on the surface of the one-dimensional photonic crystal.
The invention further improves that: the one-dimensional photonic crystal is formed by alternately distributing two materials with different media and different thicknesses, and the periodicity is 10.
The invention further improves that: the center of the circularly polarized light coincides with the center of the radial polaroid, the center of the radial polarized light coincides with the center of the spiral phase plate, the size of the expanded light spot is the same as the size of the entrance pupil of the objective lens, and the focus is on the last layer of interface of the one-dimensional photonic crystal.
The incident light angle limited by the radius of the circular diaphragm is slightly smaller than the total reflection critical angle theta formed by the matching oil solution and the aqueous solutioncThe range of the device is adjustable, and the asymmetric factor of the super-chiral optical field generated by the device is improved by more than ten times compared with the common circularly polarized optical field.
Has the advantages that: the device and the method for generating the super-chiral optical field have important application prospects in a series of fields related to chiral optics. The invention has strong performance, the super-chiral optical field generated by the device has an asymmetric factor which is more than ten times higher than that of a common circular polarized optical field, and the device is favorable for carrying out local detection on chiral molecules.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a graph of transmission coefficient of a one-dimensional photonic crystal;
FIG. 3 is a view showing that changing the radius of the circular diaphragm limits the lower limit of the incident light angle to 0.99 θcA lateral distribution of the lower asymmetry factor enhancement coefficients;
FIG. 4 is a transverse plane distribution of the transverse component of the electric field and the longitudinal component, the transverse component of the magnetic field and the asymmetry factor enhancement factor of the hyper-chiral optical field generated in FIG. 1;
fig. 5 is a longitudinal plane distribution of the electric field transverse component as well as the longitudinal component, the transverse component of the magnetic field and the asymmetry factor enhancement factor of the hyper-chiral optical field generated in fig. 1.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, a device for generating a super-chiral optical field includes a beam expanding collimation system, a radial polarization first-order vortex light beam generation system, and a super-chiral optical field generation system; the beam expanding collimation system comprises a concave lens 2 and a convex lens 3, the radial polarization first-order vortex light beam generation system comprises an 1/4 wave plate 4, a radial polaroid 5 and a spiral phase plate 6, and the hyper-chiral light field generation system comprises a circular diaphragm 7, a high-numerical aperture objective lens 8 and a one-dimensional photonic crystal 9; a medium matching oil solution is contained between the high numerical aperture objective lens 8 and the one-dimensional photonic crystal 9; the other surface of the one-dimensional photonic crystal 9 comprises a medium aqueous solution; the numerical aperture of the high numerical aperture objective 8 is 1.33; the one-dimensional photonic crystal is formed by alternately distributing media with refractive indexes of 2.15 and 3.5 respectively, the thicknesses of the media are 55 nanometers and 50 nanometers respectively, and the periodicity is 10; the other surface of the one-dimensional photonic crystal comprises a medium aqueous solution.
The one-dimensional photonic crystal 9 is formed by alternately distributing two materials with different media and different thicknesses, and the periodicity is 10. The center of the circularly polarized light coincides with the center of the radial polarizing film 5, the center of the radial polarized light coincides with the center of the spiral phase plate 6, the size of the expanded light spot is the same as the size of the entrance pupil of the objective lens, and the focus is on the last layer of interface of the one-dimensional photonic crystal 9.
The incident light angle limited by the radius of the circular diaphragm 7 is slightly smaller than the total reflection critical angle theta formed by the matching oil solution and the aqueous solutioncThe range of the device is adjustable, and the asymmetric factor of the super-chiral optical field generated by the device is improved by more than ten times compared with the common circularly polarized optical field.
When a radial polarized first-order vortex light beam is vertically irradiated from one side of the one-dimensional photonic crystal after being tightly focusedWhen the light beam strikes to the other side, the transmission coefficient curve of the one-dimensional photonic crystal is shown in FIG. 2, and the position of the transmission peak is slightly smaller than the critical angle theta of total reflectionc，θcThe critical angle for total reflection is represented by the matching oil solution and the aqueous solution. As shown in FIG. 3, changing the radius of the circular diaphragm limits the lower limit of the incident light angle to 0.99 θcHigh numerical aperture objectives limit the upper limit of the incident light angle to θNAThe lateral distribution of the enhancement coefficients of the focal plane asymmetry factor can be obtained. At the same time, the electromagnetic field distribution at the focal point can be obtained, as shown in FIGS. 4 and 5, the transverse component E of the electric field||Almost zero, longitudinal component E of the electric fieldzAs a predominant component, a doughnut-shaped distribution in the transverse plane due to interference cancellation, and the absence of the longitudinal component H of the magnetic field due to radially polarized lightzSo that only the transverse component H is present||While the direction along the longitudinal axis, E, can be seenz、H||The amplitude change is slow, the asymmetric factor of the super-chiral light field is improved by 17 times compared with the common circularly polarized light field from the distribution of the asymmetric factor enhancement coefficient, the cross section is very narrow, and the light field extends like a light needle in the direction of the longitudinal axis, so that the detection of dispersed chiral sample molecules is facilitated.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.
Claims (4)
1. An apparatus for generating a super-chiral optical field, comprising: the system comprises a beam expanding collimation system, a radial polarization first-order vortex light beam generation system and a super-chiral light field generation system; the beam expanding collimation system comprises a concave lens (2) and a convex lens (3) which are sequentially arranged, the radial polarization first-order vortex light beam generation system comprises an 1/4 wave plate (4), a radial polaroid (5) and a spiral phase plate (6) which are sequentially arranged, and the super-chiral light field generation system comprises a circular diaphragm (7), a high-numerical-aperture objective lens (8) and a one-dimensional photonic crystal (9) which are sequentially arranged; wherein a medium matching oil solution is contained between the high numerical aperture objective lens (8) and the one-dimensional photonic crystal (9); the other surface of the one-dimensional photonic crystal (9) comprises a medium aqueous solution;
laser beams (1) output by a laser are sequentially expanded and collimated through a concave lens (2) and a convex lens (3), then are incident to an 1/4 wave plate (4) and are converted into circularly polarized light from linearly polarized light, then are converted into radially polarized light beams through a radial polarizing film (5), then are converted into radially polarized first-order vortex light beams through a spiral phase plate (6), the radially polarized first-order vortex light beams carrying phase information are subjected to spatial filtering through a circular diaphragm (7), then the limited light beams are tightly focused on the last layer of interface of a one-dimensional photonic crystal (9) through a high-numerical-aperture objective lens (8), and an ultra-chiral light field with an asymmetric factor higher than that of common circular polarization is generated in a medium water solution on the surface of the one-dimensional photonic crystal (9).
2. The apparatus for generating a hyper-chiral optical field according to claim 1, wherein: the one-dimensional photonic crystal (9) is formed by alternately distributing two materials with different media and different thicknesses, and the periodicity is 10.
3. The apparatus for generating a hyper-chiral optical field according to claim 1, wherein: the center of the circularly polarized light coincides with the center of the radial polarizing film, the center of the radial polarized light coincides with the center of the spiral phase plate (6), the size of a light spot after beam expansion is the same as the size of an entrance pupil of the objective lens, and the focus of a light field is on the last layer of interface of the one-dimensional photonic crystal (9).
4. The apparatus for generating a hyper-chiral optical field according to claim 1, wherein: the incident light angle limited by the radius of the circular diaphragm (7) is slightly smaller than the total reflection critical angle theta formed by the matching oil solution and the aqueous solutioncIs adjustable within the range of (1).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114166701A (en) * | 2021-12-07 | 2022-03-11 | 东南大学 | Device and method for complete detection of chiral parameters |
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| CN111999904B (en) | 2022-04-15 |
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