KR102005624B1 - Multi-wavelength digital holography system using quantum dot - Google Patents

Abstract

A multi-wavelength digital holography system using quantum dots according to the present invention includes one light source for generating light, a quantum dot film for converting light generated from the light source into a plurality of wavelengths, And a detection unit for detecting a holographic image of the object from light having a plurality of wavelengths. According to such a configuration, it is possible to precisely detect a target object while the optical efficiency is excellent.

Description

[0001] MULTI-WAVELENGTH DIGITAL HOLOGRAPHY SYSTEM USING QUANTIUM DOT [0002]

The present invention relates to a multi-wavelength digital holography system, and more particularly, to a multi-wavelength digital holography system using quantum dots with improved quality of images detected by controlling a single wavelength of light by a multi- .

Digital holography refers to a technique of digitally producing a hologram by computing a wavefront of an object with a computer, or digitally reproducing an image from the hologram information. The main application field of this digital holography is 3D imaging through phase measurement. In particular, in the case of the transmission type digital holography in which object light is passed through a transparent object to obtain a hologram, it is possible to obtain a very precise level of phase, and thus it is utilized for measurement of a micro optical element and a bio sample.

The micro-optical device is fabricated in such a manner that a shape is processed on a specific substrate, and a bio-sample is placed on a slide glass. The measured phase is wrapped with a value within the range of -L to 광학 by the optical characteristic, and it is obtained by unwrapping it into the original phase, and then acquires three-dimensional information of the object.

The 3D measurement using the phase information of the digital holography can secure the resolution in the depth direction below the nanometer, but the accuracy is lowered due to factors such as noise during the unwrapping of the wrapped image. In addition, unripping can not be performed on a surface showing a step or a steep slope of half or more wavelengths, so that it is impossible to cope. Accordingly, various studies for applying digital holography to measurement of microscale have been continuously carried out in recent years.

Japanese Patent Application No. 2004-281139 Domestic Application No. 2008-7005377 Domestic Application No. 2010-0017759

An object of the present invention is to provide a digital holography system using quantum dots capable of improving the quality of an image detected through conversion of a single wavelength of light into multiple wavelengths and adjusting the measurement range.

According to an aspect of the present invention, there is provided a multi-wavelength digital holography system using quantum dots, including a light source for generating light, a quantum dot film for converting light generated from the light source into multi-wavelengths, And a detector for detecting a holographic image of the object from the light passing through the quantum dot film portion.

According to one aspect, the light source unit includes at least one of an LED lamp and a halogen lamp that generate low interference light, and can emit UV or blue light.

According to one aspect of the present invention, the quantum dot film portion includes a plurality of quantum dot films each converting the light into different wavelengths from the light, and the plurality of quantum dot films may be arranged to be exchangeable in at least one of the paths of the light have.

According to one aspect, the quantum dot film portion includes a first quantum dot film for converting the light to a first wavelength, a second quantum dot film for converting the light to a second wavelength, and a third quantum dot film for converting the light to a third wavelength. Wherein at least one of the first through third quantum dot films is provided between the light source unit and the detection unit so as to convert the light into any one of the wavelengths and then be replaceable with at least one of the first through third quantum dot films .

According to one aspect, the quantum dot film portion may use a quantum dot provided on the rear side of the light source portion with respect to the traveling direction of the light so as to face the light source portion.

According to one aspect of the present invention, a spatial filter unit for adjusting a wavefront of light generated from the light source unit may be disposed between the quantum dot film unit and the detection unit.

According to one aspect of the present invention, there is provided a collimator disposed on a path of light generated from the light source to collimate the light, wherein the collimator is disposed on a rear side of the quantum dot filter unit with respect to a traveling direction of the light, As shown in FIG.

According to one aspect of the present invention, at least one objective lens disposed on a path of light generated from the light source unit and guiding the path of the light may be provided.

According to one aspect of the present invention, the detection unit may include a sensing unit for sensing light converted into multi-wavelength through the quantum dot film unit to be incident on the object and being reflected or transmitted, and a controller for analyzing the sensed information, And an analyzing unit for detecting the analyzing unit.

According to one aspect of the present invention, the quantum dot film portion includes a plurality of quantum dot films for converting the light into different wavelengths from the light generated from the light source portion, wherein a single or a plurality of quantum dot films are provided so as to be replaceable on the light path, The detection unit can detect and synthesize digital holography images from the lights respectively converted by the plurality of quantum dot films.

According to one aspect, the light source unit emits blue light, and the quantum dot film unit converts the blue light into red light or green light.

A multi-wavelength digital holography system using quantum dots according to another aspect of the present invention includes a single light source section for generating light with a low interference single wavelength, and a plurality of quantum dot films for converting light generated from the light source section into different multi- And a detector for detecting holography of the object from the multi-wavelength light that has passed through the quantum dot film portion, wherein at least one of the plurality of quantum dot films is selected, Can be interchangeably arranged.

According to one aspect, the light source unit includes at least one of an LED lamp and a halogen lamp that generate low interference light, and can emit UV or blue light.

According to one aspect of the invention, the quantum dot film portion includes a first quantum dot film for converting the light to a first wavelength, a second quantum dot film for converting the light to a second wavelength, and a third quantum dot film for converting the light to a third wavelength. Wherein at least one of the first to third quantum dot films is positioned so as to face the light source portion and is capable of being changed to at least one of the first to third quantum dot films after converting the light to any wavelength .

According to one aspect of the present invention, there is provided a spatial filter for adjusting a wavefront of light generated from the light source unit, wherein the spatial frequency filter is disposed between the light source unit and the quantum dot film unit or between the quantum dot film unit and the detection unit As shown in FIG.

According to one aspect of the present invention, a collimator is disposed on a path of light generated from the light source unit to collimate the light, and at least one objective lens disposed on a path of light generated from the light source unit and guiding the path of the light And the collimator may be positioned on the rear side of the QW filter unit with respect to the traveling direction of the light so as to face the QW filter unit.

According to one aspect of the present invention, the detection unit may include a sensing unit for sensing the converted light incident on the object and converted or reflected by the respective light beams converted through the plurality of quantum dot films, And an analyzing unit for detecting a holographic image of the object by synthesizing the sensed information.

According to the present invention having the above-described configuration, first, since a single wavelength light can be converted into multiple wavelengths using a quantum dot film, the measurement range can be adjusted according to the object, .

Second, a plurality of quantum dot films can be interchangeably provided on the light path so that the wavelength of light is changed, so that accurate holographic imaging can be performed for steps and inclination over a range from a low step to a high step through a simple structure.

Third, by securing different wavelengths of conversion having the same light quantity by using a plurality of quantum dot films, it is possible to reduce the occurrence of noise at the time of synthesizing the detected images, which is excellent in light efficiency.

Fourth, a multi-wavelength digital holography image can be detected by using the low-interference light source unit, and a compact and simplified compact structure can be provided.

1 is a block diagram schematically showing a multi-wavelength digital holography system using quantum dots in a preferred embodiment of the present invention.
FIG. 2 is a schematic view showing a state in which the quantum dot film portion shown in FIG. 1 is replaced.
3 is a view schematically showing a plurality of quantum dot films of a quantum dot film portion. And,
4 is a block diagram schematically illustrating a multi-wavelength digital holography system using quantum dots according to another preferred embodiment of the present invention.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 and 2, a multi-wavelength digital holography system 1 using quantum dots according to a preferred embodiment of the present invention includes a light source 10, a quantum dot film 20, .

The light source unit 10 generates low interference light L and is provided in a single number. The light source unit 10 includes at least one of an LED (Light Emitting Diode) lamp and a halogen lamp, and is exemplified as including an LED lamp in this embodiment. The light source unit 10 has an advantage of having low speckle noise as compared with a highly coherent light source such as a laser.

In the present embodiment, the light source unit 10 includes an LED lamp to generate blue light L having a high efficiency. However, the present invention is not limited to this, and various modifications such as that the light source unit 10 emits light using a UV lamp are also possible.

The quantum dot film unit 20 converts the single-wavelength light L generated from the light source unit 10 into a plurality of multi-wavelengths. The quantum dot film portion 20 includes a plurality of quantum dot films 21, 22, and 23 that can convert light L to different wavelengths as shown in FIG. For example, the quantum dot film portion 20 may include three quantum dot films 21, 22, and 23 for converting different wavelengths as shown in FIG. 3, and the number of such quantum dot films is not limited to the illustrated example Do not.

More specifically, the quantum dot film portion 20 includes a first quantum dot film 21 having a central wavelength range of 600 nm, a second quantum dot film 22 having a central wavelength range of 620 nm, and a third quantum dot film 22 having a center wavelength range of 640 nm. And a quantum dot film 23. That is, the quantum dot film section 20 can adjust the central wavelength range of the light L through the plurality of quantum dot films 21, 22, and 23 to adjust the measurement range. For reference, the center wavelength range of the first to third quantum dot films 21, 22, and 23 is not limited to the above example.

The first through third quantum dots 21, 22 and 23 are arranged to be interchangeable on the path of the light L as shown in Figs. 1 and 2, thereby changing the light L to various wavelengths Can be converted and separated. That is, the quantum dot film portion 20 can be replaced with any one of a plurality of quantum dot films 21, 22, and 23 so as to convert the light L to different wavelengths during the process of extracting the digital holography image .

For example, as shown in FIG. 1, at least one of the first to third quantum dot films 21, 22, and 23, for example, the first quantum dot film 21 is provided between the light source unit 10 and the detection unit 30 And converts the light L to a wavelength of 600 nm. Subsequently, as shown in Fig. 2, the second quantum dot film 22, which is at least another one of the first to third quantum dot films 21, 22 and 23, is replaced with a light beam L having a wavelength of 620 nm, do.

For reference, in this embodiment, as shown in FIGS. 1 to 3, the first to third quantum dots 21, 22 and 23 are replaced with two of the two quantum dots 21 and 22 And illustrations, but are not necessarily limited thereto. That is, various embodiments in which the quantum dot film portion 20 includes four or more quantum dot films according to digital holography imaging conditions and can be replaced three or more times is also possible.

The quantum dot filter unit 20 may be provided on the rear side of the light source unit 10 with respect to the traveling direction of the light L so as to face the light source unit 10. Accordingly, the quantum dot film portion 20 directly receives and absorbs the light L of a single wavelength generated from the light source portion 10, converts the light into another wavelength, and re-emits light. At this time, collimation by the collimator 11 is required as the light L converted through the quantum dot film portion 20 and re-emitted is emitted in all directions.

The collimator 11 is provided on the rear side with respect to the traveling direction of the light L so as to face the quantum dot film portion 20 and adjusts the size and direction of the light L converted through the quantum dot film portion 20 Collimate to parallel rays. The light L adjusted through the collimator 11 is guided to the spatial filter unit 40.

The spatial frequency filter unit 40 may be disposed between the quantum dot film unit 20 and the detection unit 30 and may include a spatial filter such as a pin hole to detect the wave front of the light L Adjust it uniformly. That is, the spatial frequency filter unit 40 uniformly adjusts the uneven wavefront, which is one of the characteristics of the light L having the low interference characteristic generated from the light source unit 10.

An objective lens 50 is provided between the collimator 11 and the spatial frequency filter unit 40 to guide the collimated light L to the spatial frequency filter unit 40. An objective lens 50 is also provided between the spatial frequency filter unit 40 and a detection unit 30 to be described later to guide the path of the light L. [

The detection unit 30 detects holography of the target object 80 from light L of a plurality of wavelengths passed through the quantum dot film unit 20. [ The detection unit 30 includes a sensing unit 31 that senses light L reflected from a target object 80 and an analysis unit 32 that analyzes the sensed information to detect a holographic image, Thereby detecting the target object 80. [ In this embodiment, the sensing unit 31 includes a CCD (Charge-Coupled Device) that captures light L reflected from the target object 80. The analyzing unit 32 includes a computer. do.

The separation unit 60 separates light L converted into a specific wavelength through the quantum dot film unit 20 and guides the light L to the object 80 and the analysis unit 32. The separator 60 includes a beam splitter.

The separating section 60 separates the light L having passed through the quantum dot film section 20 into two parts so that part of the separated light L is illuminated to the object 80 to form an object wave reflected, Is illuminated by the analyzer 32 to form a reference wave. At this time, the reflector 70 for guiding the path of the light L by blocking the leakage of the light L separated through the separating unit 60 is provided so as to be adjustable in position. That is, the multi-wavelength digital holography system 1 according to the present embodiment is a reflection system that detects a holographic image through light reflected from a target object 80.

An operation of detecting a holographic image of a target object 80 of a multi-wavelength digital holography system 1 using quantum dots according to an embodiment having the above-described configuration will be described with reference to Figs. 1 and 2. Fig.

1, the light L generated from the light source unit 10 is converted through the quantum dot film unit 20 to generate one low interference light. More specifically, the quantum dot film portion 20 has a structure in which the first quantum dot film 21 for converting only the light L of the first wavelength among the plurality of quantum dots 21, 22, By being provided on the path, the light L is converted into the first wavelength.

The light L converted into the first wavelength by the first quantum dot film 21 is collimated through the collimator 11 and then incident on the spatial frequency filter unit 40 through the objective lens 50, And is uniformly adjusted. The light L passes through the objective lens 50 and then is separated by the separating unit 60 to be illuminated and reflected by the target object 80 and guided to the detecting unit 30. [

Thereafter, the first quantum dot film 21 of the quantum dot film portion 20 is replaced with the second quantum dot film 22 to convert the light L into the light L of the second wavelength. The light L converted into the second wavelength is again reflected by the object 80 by being separated from the separation unit 60 by sequentially passing through the collimator 11 and the spatial frequency filter unit 40, , And is guided to the detection unit (30).

For reference, the quantum dot film unit 20 can convert blue light L of a single wavelength generated from the light source unit 10 into red light or green light.

After the sensing unit 31 of the detecting unit 30 captures an image of the object 80 using the light of the converted wavelength, the analyzing unit 32 analyzes the image and finally detects the holographic image. That is, the analysis unit 32 synthesizes the holographic data of the object 80 photographed by the sensing unit 31 with the light L extracted at the first and second wavelengths, subtracts each phase value The original step is obtained through an unwrapping process.

In the above-described embodiment, only one quantum dot film is disposed on the path of the light L, but the present invention is not limited thereto. For example, a modified example in which a plurality of light Ls are separated and a quantum-dot film having a different wavelength range is disposed on the path of each of the plurality of lights L, thereby simultaneously converting the light L to different wavelengths .

FIG. 4 is a diagram schematically showing a multi-wavelength digital holography system 100 using quantum dots according to another preferred embodiment of the present invention. Referring to FIG. 4, a multi-wavelength digital holography system 100 using quantum dots according to another embodiment includes a light source 110, a quantum dot film 120, and a detector 130.

Here, the configurations of the light source unit 110, the quantum dot film unit 120, and the detection unit 130 are similar to those of the embodiment described above, and therefore, a detailed description thereof will be omitted. The collimator 111 is provided so as to face the quantum dot film portion 120 and the objective lens 150 and the spatial frequency filter portion 140 are provided on the rear side of the collimator 111 to guide the light L And therefore, a detailed description thereof will be omitted.

According to another embodiment of the present invention, the light 1 converted to a multi-wavelength through the quantum dot film unit 120 is separated from the separating unit 160, a part of the light is transmitted to the object 180, Lt; / RTI > That is, according to another embodiment, a transmission method of detecting the holographic image by transmitting the light L to the object 180 is applied.

4, the single low-interference light L generated from the light source unit 110 passes through the quantum dot film unit 120 and is converted into a specific wavelength, and then passes through the collimator 111 and the objective lens 150, And enters the spatial frequency filter unit 140 to adjust the wavefront. The adjusted light L is guided by the objective lens 150 again and separated by the first separator 161 of the separator 160 and reflected by the first and second reflectors 171 and 172 The route is guided. At this time, a part of the separated light L guided by the first reflector 171 passes through the object O and is guided to the detection unit 130 via the second separator 162, and the second reflector 172 Is guided to the detection unit 130 through the second separation unit 162. The detection unit 130 detects the light L that is guided by the detection unit 130, Then, the sensing unit 131 of the detecting unit 130 senses the holographic data of the specific wavelength from the light L.

Also, although not shown in detail, in the multi-wavelength digital holography system 100 using the quantum dots according to another embodiment, the quantum dot film portion 120 can be replaced with a plurality of quantum dot films. As a result, the quantum dot film portion 120 transforms the light L to various wavelengths through replacement of a plurality of quantum dot films, thereby detecting the target object 180 in a transmission manner. The multi-wavelength holographic images through the exchange of the quantum dot film are synthesized in the same manner as in the above embodiment, and the original step is obtained through the unwrapping process after each phase value is obtained.

Although the present invention has been described with reference to the preferred embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the following claims. It can be understood that

1, 100: Multi-wavelength digital holography system using quantum dots
10: Light source part 20: Quantum dot film part
30: Detection unit 40: Spatial frequency filter unit
50: objective lens 60:
70: reflector 80: object
L: Light

Claims (17)

A light source for generating light;
A quantum dot film unit for converting the light generated from the light source unit into multiple wavelengths; And
A detector for detecting a holographic image of the object from the light having passed through the quantum dot film portion;
/ RTI >
Wherein the quantum dot film portion includes a plurality of quantum dot films for converting the light to different wavelengths, and at least one of the plurality of quantum dot films is selectively disposed in the light path, and a multi-wavelength digital holography system. The method according to claim 1,
Wherein the light source unit includes at least one of an LED lamp and a halogen lamp that generates low interference light and uses a quantum dot that emits UV or blue light. delete The method according to claim 1,
The quantum-
A first quantum dot film for converting the light into a first wavelength;
A second quantum dot film for converting the light to a second wavelength; And
A third quantum dot film for converting the light to a third wavelength;
/ RTI >
At least one of the first to third quantum dot films is provided between the light source section and the detection section and uses the quantum dots that can be replaced with at least one of the first to third quantum dot films after converting the light to a certain wavelength Wavelength digital holography system. The method according to claim 1,
Wherein the quantum dot film portion uses quantum dots provided on a rear side of the light source portion with respect to a traveling direction of the light so as to face the light source portion. The method according to claim 1,
A spatial filter unit for adjusting a wavefront of light generated from the light source unit;
/ RTI >
Wherein the spatial frequency filter uses a quantum dot disposed between the quantum dot film portion and the detection portion. The method according to claim 1,
And a collimator disposed on a path of light generated from the light source to collimate the light,
Wherein the collimator uses quantum dots provided on a rear side of the quantum-dot filter unit with respect to a traveling direction of the light so as to face the quantum-dot filter unit. The method according to claim 1,
And a quantum dot disposed on a path of light generated from the light source unit and provided with at least one objective lens for guiding the path of the light. The method according to claim 1,
Wherein:
A sensing unit for sensing light converted into multi-wavelength light through the quantum dot film unit to be reflected or transmitted through the object; And
An analyzer for analyzing the sensed light to detect the holographic image;
And a quantum dot including the quantum dot. 10. The method of claim 9,
The plurality of quantum dot films may be disposed in a single or a plurality of paths on the light path,
The sensing unit senses the light converted by the plurality of quantum dot films, and the analyzing unit combines the sensed information from the light converted through the plurality of quantum dot films to use the quantum dot for detecting the holographic image Wavelength digital holography system. The method according to claim 1,
The light source unit emits blue light,
Wherein the quantum dot film portion uses quantum dots that convert the blue light into red light or green light. A single light source for generating low interference light having a single wavelength;
A quantum dot film part including a plurality of quantum dot films each converting the light generated from the light source part to different wavelengths; And
A detector for detecting holography of the object from the light passing through the quantum dot film portion;
/ RTI >
Wherein at least one of the plurality of quantum dot films is selected to use a quantum dot that is disposed interchangeably between the light source section and the detection section. 13. The method of claim 12,
Wherein the light source unit includes at least one of an LED lamp and a halogen lamp that generates low interference light and uses a quantum dot that emits UV or blue light. 13. The method of claim 12,
The quantum-
A first quantum dot film for converting the light into a first wavelength;
A second quantum dot film for converting the light into a second wavelength; And
A third quantum dot film for converting the light to a third wavelength;
/ RTI >
Wherein at least one of the first to third quantum dot films is positioned so as to face the light source portion and the light is converted to a wavelength and then a quantum dot that can be replaced with at least one of the first to third quantum dot films is used, Digital holography system. 13. The method of claim 12,
A spatial filter unit for adjusting a wavefront of light generated from the light source unit;
/ RTI >
Wherein the spatial frequency filter uses a quantum dot disposed between the quantum dot film portion and the detection portion. 13. The method of claim 12,
A collimator disposed on a path of light generated from the light source to collimate the light; at least one objective lens disposed on a path of light generated from the light source to guide a path of the light;
/ RTI >
Wherein the collimator uses quantum dots located on a rear side of the quantum-dot filter unit with respect to a traveling direction of the light so as to face the quantum-dot filter unit. 13. The method of claim 12,
Wherein:
A sensing unit that senses the converted light that is incident on the target and is reflected or transmitted through the plurality of quantum dot films; And
An analyzer for synthesizing information sensed by the light converted through the plurality of quantum dots and detecting a holographic image of the object;
And a quantum dot including the quantum dot.

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