TWI596331B - Quasi-radial polarized surface plasmon excitation device and imaging method thereof - Google Patents

Description

Quasi-radial polarized light surface plasma excitation device and imaging method thereof

The invention relates to an optical component, in particular to a surface-plasma excitation device for quasi-radial polarization and an imaging method thereof.

As shown in FIG. 6, a surface-plasma excitation device for conventional radial polarization, a laser beam 911 is emitted from a laser generator 91, and the laser beam 911 is generated by a radial polarization converter 92. As shown by the effect of the radial polarization shown in Fig. 7, the polarized laser beam 911 is reflected by the objective lens 93 and reflected on the surface of the gold film 94 to generate a surface plasma resonance phenomenon, and the reflected laser beam 911 is returned. After the objective lens 93 is attached, an image of the image sensor 95 is shown in Fig. 8. An inner ring 96 (shown by a broken line in the figure) is clearly visible, and the inner ring 96 shows the surface plasma resonance. Light intensity dips, commonly used in the field of biomedical testing.

However, in order to achieve the desired accuracy of the test results, the equipment used in the surface plasma excitation process, particularly the aforementioned radial polarization converter 92 (component or device), has certain precision and stability requirements. Therefore, there is a problem of expensive construction, which is the main focus of the invention.

The main object of the present invention is to solve the above problems and provide a quasi-radial polarized light surface plasma excitation device and an imaging method thereof, which are driven through a linear polarizer in a driving source band. Rotating downwards allows the penetrating source to produce a quasi-radial polarization characteristic in the time domain, while obtaining acceptable detection results at a relatively low cost.

For the purpose of the foregoing, the surface-plasma plasma excitation device of the present invention includes: a light source generator that emits a collimated beam and sequentially penetrates a linear polarization rotator according to the path of the beam a spatial optical filter, a reticle and a beam splitter, and a set of composite lenses disposed in a path through which the beam penetrates the beam splitter, and an image sense is provided on a path of the beam reflected by the beam splitter portion The linear polarization rotator is provided with at least one phase retardation wave plate and a linear polarization plate penetrated by the light beam, and the linear polarization plate is driven by a driving source to rotate its central axis. The beam produces a time domain superimposed quasi-radial polarization characteristic by the linear polarizer as it rotates.

Wherein the at least one phase delay wave plate comprises a first wave plate capable of generating a phase difference of one-half wavelength and a second wave plate capable of generating a phase difference of a quarter wavelength, the first wave plate, The second wave plate and the linear polarizer are sequentially penetrated in the path of the light beam.

Wherein, the composite lens is composed of a lenticular lens and a hemispherical coupling ,, and the lenticular lens is arranged side by side according to the path of the light beam, and the surface of the hemispherical coupling 有 has a half sphere and a plane, and the gold film paste In the plane, the beam passing through the beam splitter penetrates the lenticular lens successively, and then the hemispherical surface penetrates the hemispherical coupling 稜鏡, and a surface plasma excitation phenomenon is reflected on the surface of the gold film.

Wherein, the light source generator is a laser generator, and the light beam is a collimated laser beam.

Wherein, the light source generator comprises a white light source and a color filter, and the white light source emits light and penetrates the color filter to form the light beam.

For the purpose of the foregoing, an imaging method for a surface-plasma plasma excitation device of the present invention includes: emitting, by the light source generator, the light beam, which is worn before or after passing through the spatial light filter Through the at least one phase retardation wave plate of the linear polarization rotator and the linear polarization plate, the beam expanding collimated beam formed by the spatial optical filter passes through the beam splitter and is divided into two parts by the beam splitter a penetrating beam and a two-part reflected beam, the two-part penetrating beam being focused on the surface of the gold film by the composite lens to form a surface plasma resonance, and reflected back to the beam splitter and then through the two parts The beam reflected by the beam splitter performs image recording on the image sensor; wherein when the beam penetrates the linear polarization rotator, the linear polarizer is rotated by the driving source, and the beam passes through the rotating The linear polarizing plate and the time domain superimposition quasi-radiation polarization characteristic, and the image sensor generates recording superimposed on images generated by different polarization angles to obtain a quasi-radial polarized light surface plasma Image vibration results.

The above and other objects and advantages of the present invention will be readily understood from

Of course, the invention may be varied on certain components, or in the arrangement of the components, but the selected embodiments are described in detail in the specification and their construction is shown in the drawings.

(customized part)

91‧‧‧Laser Generator

911‧‧‧Laser beam

92‧‧‧radial polarization converter

93‧‧‧Contact objective

94‧‧‧ gold film

95‧‧‧ sensor

96‧‧‧ inner circle

(part of the invention)

1‧‧‧Light source generator

11‧‧‧ Beam

2‧‧‧Linear Polarity Rotator

21‧‧‧Linear polarizer

22‧‧‧First wave

23‧‧‧second wave plate

3‧‧‧Spatial optical filter

4‧‧‧Photomask

5‧‧‧beam splitter

6‧‧‧Composite lens

61‧‧‧ convex lens

62‧‧‧ convex lens

63‧‧‧ hemispherical coupling

631‧‧‧ hemisphere

632‧‧‧ plane

7‧‧‧Image sensor

8‧‧‧gold film

11'‧‧‧Expanded collimated beam

111’‧‧‧ Beam

112’‧‧‧ Beam

1A‧‧‧Light source generator

11A‧‧‧beam

12A‧‧‧White light source

13A‧‧‧Color Filter

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the configuration of a quasi-radial polarization solar surface plasma excitation device according to a first embodiment of the present invention.

Fig. 2 is a view showing a process in which the linear polarizing plate of the first embodiment of the present invention is rotated to generate a time-domain superimposed quasi-radial polarization characteristic.

Fig. 3 is an image comparison diagram of the surface plasma resonance results obtained by the quasi-radial polar-polar surface plasma excitation device of the present invention and the conventional radial polarization converter, respectively.

Fig. 4 is a schematic view showing the arrangement of a quasi-radial polarization solar surface plasma excitation device according to a second embodiment of the present invention.

Fig. 5 is a schematic view showing the arrangement of a quasi-radial polarization laser surface plasma excitation device according to a third embodiment of the present invention.

Figure 6 is a schematic view showing the configuration of a conventional surface plasma excitation device.

Figure 7 is a schematic illustration of the radial polarization characteristics of a conventional laser beam through a radial polarization converter.

Fig. 8 is a schematic diagram showing the image of the surface plasma resonance obtained by the conventional surface plasma excitation device on the image sensor.

Referring to Figures 1 through 3, the structure of the embodiment selected for use in the present invention is for illustrative purposes only and is not limited by such structure in the patent application.

The embodiment provides a surface-plasma excitation device for quasi-radial polarization, and an imaging method thereof. The surface-plasma excitation device of the quasi-radial polarization is shown in FIG. 1 and includes a light source generator. a linear polarization rotator 2, a spatial optical filter 3, a reticle 4, a beam splitter 5, a composite lens 6 and an image sensor 7, wherein:

As shown in FIG. 1, the light source generator 1 can emit a light beam 11 which is collimated and corrected, and the spatial light filter 3, the reticle 4 and the beam splitter 5 are sequentially arranged to penetrate according to the path of the light beam 11. The linear polarization rotator 2 is disposed in front of the spatial optical filter 3 in the present embodiment, and a composite lens 6 is disposed in a path through which the beam 11 is partially penetrated by the beam splitter 5, and the composite lens 6 is aligned with the hemispherical coupling. The gold film 8 to be tested (which may also be a silver film in different embodiments) is provided in the beam 11 The path of the light mirror 5 partially reflected is provided with an image sensor 7. Wherein, the linear polarization rotator 2 is sequentially provided with a phase retardation wave plate penetrated by the light beam 11 and a linear polarization plate 21, and the linear polarization plate 21 is driven by a driving source (which can be manually operated or driven by a motor) The light is rotated by its central axis, and the light beam 11 is subjected to the characteristic of temporally superimposed quasi-radial polarization by the linear polarizing plate 21 at the time of rotation. In this embodiment, the light source generator 1 is a laser generator, and the beam 11 is a collimated laser beam.

As shown in FIG. 1 , the phase retardation wave plate includes a first wave plate 22 and a second wave plate 23 in the embodiment. The first wave plate 22 can generate a phase difference of one-half wavelength, and second. The wave plate 23 can generate a phase difference of a quarter wavelength, and the light beam 11 penetrates the second wave plate 23 after penetrating the first wave plate 22, and finally penetrates the linear polarizing plate 21. When the light beam 11 penetrates the first wave plate 22, linear polarization is generated, and when the second wave plate 23 is penetrated, circular polarization is generated.

As shown in Fig. 1, the composite lens 6 is composed of a lenticular lens 61, 62 and a half ball coupling 稜鏡 63. The lenticular lenses 61, 62 are arranged side by side in the path of the light beam 11, and the hemispherical coupling 稜鏡 63 The surface has a semi-spherical surface 631 and a flat surface 632. The gold film 8 is attached to the plane 632. The beam 11 that penetrates the beam splitter 5 penetrates the two convex lenses 61 and 62 successively, and then the hemispherical surface 631 penetrates the hemispherical coupling. 63, and reflected on the surface of the gold film 8.

The surface quenching device of the quasi-radial polarized light is mainly formed by the light source generator 1 emitting a light beam 11 passing through the phase retardation wave plate of the linear polarization rotator 2 (the first wave plate 22 and a second wave plate 23) and a linear polarizing plate 21 are then passed through the spatial light filter 3 to form a beam expanding collimated beam 11', which then passes through the reticle 4 and the beam splitter 5 Thereafter, the beam splitter 5 is divided into a two-part penetrating beam 111' and a two-part reflecting beam 112'. The two-part penetrating beam 111' is focused on the gold film 8 via the lenticular lenses 61, 62 and the hemispherical coupling 稜鏡 63. The surface forms a surface plasma resonance, and is reflected back to the beam splitter 5 to reflect again to record an image on the image sensor 7. When the light beam 11 is passing through the linear polarization rotator 2, the linear polarizing plate 21 Rotating by the driving source, the light beam 11 generates a characteristic of temporally superimposed quasi-radial polarization by the linear polarizing plate 21 when rotated. As shown in Fig. 2, it can be seen that images generated at different polarization angles are recorded and superimposed on the image sensor 7 to obtain an image of the quasi-radial polarization photochemical resonance results. Further, as shown in FIG. 3, the (a)th image is an image of the actual surface plasma resonance result obtained by the surface-plasma plasma excitation device of the quasi-radial polarization light of the above embodiment, and the (b) figure is a habit. Knowing the image of the actual surface plasma resonance obtained by the radial polarization converter 92, both of the front and the rear can obtain the phenomenon of the dark ring generated by the sudden drop of the light intensity at the time of the radial polarization of the surface plasma.

It is not difficult to find out from the above description that the present invention can be used to replace the conventional radial polarization converter 92 by using only one linear polarizing plate 21 to be rotated by the driving source, and the surface plasma resonance result can also be obtained. The image, and is conventionally similar to the image obtained by the radial polarization converter 92, is referenced, but is relatively inexpensive compared to conventional radial polarization converters 92, thereby solving the conventional surface plasma excitation process. The equipment used is expensive.

Of course, there are many examples of the invention, with only minor variations in the details. Referring to FIG. 4, which is a second embodiment of the present invention, the main difference from the first embodiment is that the linear polarization rotator 2 of the present embodiment is disposed after the spatial optical filter 3 (this is Between the reticle 4 and the beam splitter 5, the light beam 11 in the present embodiment passes through the spatial light filter 3 to form a beam expanding collimated beam 11', and passes through the reticle 4 and the linear polarization rotator After the phase retardation wave plate (the first wave plate 22 and the second wave plate 23) and the linear polarizing plate 21, the beam splitter 5 is passed through the beam splitter 5 and split into two parts to penetrate the light beam 111' and the two parts. The reflected beam 112' can also achieve the same effect as the first embodiment.

Referring to FIG. 5, which is a third embodiment of the present invention, the main difference from the first embodiment is that the light source generator 1A of the present embodiment has a white light source 12A and a color filter. The wave plate 13A is composed of a white light source 12A that emits light and penetrates the color filter 13A to form the light beam 11A of the light beam 11 of the first embodiment, and the same effect as that of the first embodiment can be achieved.

The above description of the embodiments is intended to be illustrative of the invention and is not intended to limit the scope of the invention.

From the above detailed description, it will be apparent to those skilled in the art that the present invention can achieve the foregoing objects and is in accordance with the provisions of the Patent Law.

1‧‧‧Light source generator

11‧‧‧ Beam

2‧‧‧Linear Polarity Rotator

21‧‧‧Linear polarizer

22‧‧‧First wave

23‧‧‧second wave plate

3‧‧‧Spatial optical filter

4‧‧‧Photomask

5‧‧‧beam splitter

6‧‧‧Composite lens

61‧‧‧ convex lens

62‧‧‧ convex lens

63‧‧‧ hemispherical coupling

631‧‧‧ hemisphere

632‧‧‧ plane

7‧‧‧Image sensor

8‧‧‧gold film

11'‧‧‧Expanded collimated beam

111’‧‧‧ Beam

112’‧‧‧ Beam

Claims (5)

A surface-plasma plasma excitation device for quasi-radial polarization, comprising: a light source generator for emitting a collimated beam, and sequentially penetrating a spatial optical filter, a photomask and a beam splitter according to the path of the beam; a linear polarization rotator is disposed in front of or behind the spatial light filter according to the path of the light beam, and a surface of the gold film to be tested is formed on the path of the light beam penetrating the beam splitter to form a surface electricity a composite lens of the plasma resonance, and an image sensor is disposed in a direction in which the light beam is partially reflected by the beam splitter; wherein the linear polarized rotator is sequentially provided with a light penetrating one of the light beams a first wave plate having a phase difference of one wavelength, a second wave plate capable of generating a phase difference of a quarter wavelength, and a linear polarizing plate driven by a driving source to be rotated by a central axis thereof, The beam is characterized by a time domain superimposed quasi-radial polarization by the linear polarizer as it rotates. The surface-plasma plasma excitation device according to claim 1, wherein the composite lens is composed of a lenticular lens and a hemispherical coupling ,, and the lenticular lens is arranged side by side according to the path of the light beam. The surface of the hemispherical coupling enthalpy has a semi-spherical surface and a plane. The gold film is attached to the plane, and the beam passing through the spectroscope penetrates the lenticular lens successively, and then the hemisphere penetrates the hemisphere. Coupling 稜鏡 and reflecting on the surface of the gold film. A surface-plasma plasma excitation device according to claim 1, wherein the light source generator is a laser generator that emits a collimated laser beam. A surface-plasma plasma excitation device according to claim 1, wherein the light source generator comprises a white light source and a color filter, and the white light source emits light and penetrates the color filter to The beam is formed. An image forming method of a surface-plasma plasma excitation device according to any one of claims 1 to 4, comprising: emitting, by the light source generator, the light beam passing through the spatial light filter Before or after, passing through at least one phase retardation wave plate of the linear polarization rotator and the linear polarization plate, the beam expanding collimated beam formed by the spatial optical filter passes through the beam splitter after being passed through the beam splitter The beam splitter is divided into a two-part penetrating beam and a two-part reflecting beam, and the two-part penetrating beam is focused on the surface of the gold film by the compound lens to form a surface plasma resonance, and is reflected back to the beam splitter and The two portions of the light beam reflected by the beam splitter form an image record on the image sensor; wherein the light beam is rotated by the driving source when the light beam penetrates the linear polarization rotator, The light beam is rotated by the linear polarizer to generate a time-domain superimposed quasi-radial polarization characteristic, and the images recorded by the image sensor at different polarization angles are superimposed to obtain a quasi-radial polarized surface electric Resonance imaging results.