WO2010147296A1 - 에이에프엠 측정 방법 및 에이에프엠 측정 시스템 - Google Patents
에이에프엠 측정 방법 및 에이에프엠 측정 시스템 Download PDFInfo
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- WO2010147296A1 WO2010147296A1 PCT/KR2010/002073 KR2010002073W WO2010147296A1 WO 2010147296 A1 WO2010147296 A1 WO 2010147296A1 KR 2010002073 W KR2010002073 W KR 2010002073W WO 2010147296 A1 WO2010147296 A1 WO 2010147296A1
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- intensity
- cantilever
- tip
- incident light
- light
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01Q—SCANNING-PROBE TECHNIQUES OR APPARATUS; APPLICATIONS OF SCANNING-PROBE TECHNIQUES, e.g. SCANNING PROBE MICROSCOPY [SPM]
- G01Q30/00—Auxiliary means serving to assist or improve the scanning probe techniques or apparatus, e.g. display or data processing devices
- G01Q30/02—Non-SPM analysing devices, e.g. SEM [Scanning Electron Microscope], spectrometer or optical microscope
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01Q—SCANNING-PROBE TECHNIQUES OR APPARATUS; APPLICATIONS OF SCANNING-PROBE TECHNIQUES, e.g. SCANNING PROBE MICROSCOPY [SPM]
- G01Q60/00—Particular types of SPM [Scanning Probe Microscopy] or microscopes; Essential components thereof
- G01Q60/24—AFM [Atomic Force Microscopy] or apparatus therefor, e.g. AFM probes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y35/00—Methods or apparatus for measurement or analysis of nanostructures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N37/00—Details not covered by any other group of this subclass
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/26—Electron or ion microscopes; Electron or ion diffraction tubes
- H01J37/28—Electron or ion microscopes; Electron or ion diffraction tubes with scanning beams
Definitions
- the present invention relates to AFM, and more particularly to an AFM measurement method and an AFM measurement system.
- An Atomic Force Microscope is a high-precision surface analysis instrument that measures the shape of a sample surface in atomic units using the interaction force between atoms.
- the AFM is equipped with a cantilever to measure the sample, and the tip of the cantilever is equipped with a pointed probe or tip, which is the size of several atoms (a few nm). Very sharp) When the probe approaches the sample surface, a pulling (pulling) or pushing force (repulsive force) is applied depending on the distance between the probe tip atom and the sample surface atom.
- AFM is used for surface roughness measurement in semiconductor processes and the like, and for defect reading such as chips or masks.
- AFM however, lacked chemical selectivity and did not have the ability to distinguish the chemical properties of the sample.
- methods such as incorporating an optical microscope into an AFM or providing chemical selectivity through chemical treatment of an AFM tip have been studied. One of them is using Raman Spectroscopy.
- the scattered light may retain its original energy, but may have less or more energy than the original light. .
- the process of scattering while maintaining the original energy of the scattered light is called Rayleigh scattering, and the process of scattering while losing or gaining energy is called Raman Scattering or inelastic scattering.
- Raman scattering is the case of returning to the ground state after absorbing or releasing the vibration energy of molecules.
- the electronic state does not change, but the transition of the vibration state occurs.
- the stroke effect is called a stroke effect.
- the energy of the radiation is absorbed by the molecules, so that light having a lower wavelength than the incident light source, that is, light having a longer wavelength, is scattered.
- the molecule emits vibration energy and returns to the ground state, it is called anti-strokes effect. Since radiation is obtained from the molecule, energy of shorter wavelength than that of incident light source Scattered out Through this Raman scattering process, energy exchange between the incident light source and the material occurs.
- analyzing the scattered light can infer the molecular structure of the material. In general, this change can be measured by observing how much energy lost or gained before and after scattering.
- the change in the spectrum before and after the scattering is called Raman Shift.
- the Raman shift corresponds to the vibrational frequency of the molecule.
- An object of the present invention is to provide an AFM scanning method capable of scanning in a state where the tip of the cantilever is positioned at the point where the intensity of incident light becomes the highest during AFM scanning.
- the method includes providing a tip of a cantilever to a plurality of points on a substrate to which incident light is irradiated from a light source, measuring the intensity of scattered light generated between the tip of the cantilever and the substrate by the incident light, and the intensity of the scattered light Inputting the data processing unit to find the point where the intensity of the incident light is the highest, and moving the tip of the cantilever to the point where the intensity of the incident light is the highest.
- the method further includes moving and measuring the substrate while fixing the relative position of the tip of the cantilever and the light source.
- the data processing unit may find a point where the intensity of the incident light is the highest by substituting a Gaussian function for the plurality of points and the intensity of the scattered light.
- the data processor is characterized by finding a point where the intensity of the incident light is the highest by substituting a Gaussian function for the plurality of points and the intensity of the scattered light at the plurality of points.
- providing the cantilever to the plurality of points includes irradiating the incident light to the tip of the cantilever and moving the cantilever while the incident light is fixed.
- the system includes a measuring unit including a cantilever and a tip provided at an end of the cantilever, a driving unit providing the cantilever to a plurality of points on a substrate to which incident light is irradiated from the light source unit, scattered light generated between the tip of the cantilever and the substrate.
- a sensor unit for measuring the intensity of the; and a data processing unit for receiving the intensity of the scattered light to find a point where the intensity of the incident light is the highest.
- the tip of the cantilever is characterized in that the surface treatment with a metal material.
- the driving unit may further move the tip to the point where the intensity of the incident light is the highest.
- the data processor is characterized by finding a point where the intensity of the incident light is the highest by using a Gaussian function.
- the data processing unit may find a point where the intensity of the incident light is the highest by substituting the plurality of points and the intensity of the scattered light into a Gaussian function.
- Scanning can be performed with the tip of the cantilever positioned at the point where the incident light intensity is the highest, thereby enabling more accurate AFM scanning.
- FIG. 1 is a process flowchart of an AFM measuring method according to an embodiment of the present invention.
- FIG. 2 is a view for explaining an AFM measurement system according to an embodiment of the present invention.
- 3 and 4 are diagrams showing the movement path of the tip of the cantilever according to an embodiment of the present invention.
- FIG. 5 is a curve illustrating the intensity distribution of scattered light according to a-a 'of FIG. 4.
- FIG. 1 is a flowchart illustrating an AFM measurement method according to an embodiment of the present invention.
- 2 to 5 are diagrams for explaining the AFM measurement system according to an embodiment of the present invention.
- the tip 122 of the cantilever 121 is irradiated with light (S1).
- the light may be generated in the light source unit 110.
- the light source unit 110 may be a laser light source.
- it may be Nd: YAG laser (neodymium-doped yttriym aluminum ganet laser) or Ti: sapphire laser.
- the light generated by the light source unit 110 may be irradiated to the upper part of the cantilever during the scanning of the substrate to be described below through a splitter (not shown) and used to measure the movement of the cantilever.
- the light generated by the light source unit 110 arrives at the measurement unit 120.
- the measurement unit 120 includes a cantilever 121.
- a tip 122 may be provided at the end of the cantilever 121.
- the shape of the tip 122 may be a triangular pyramid, a square pyramid, or a cone.
- the tip of the tip 122 may be very sharp with the size of several atoms.
- attraction force or repulsive force may act between the atoms of the tip 122 and the atoms of the surface to be measured.
- the end of the tip 122 may be surface treated with a metal material 123 for Raman scattering.
- the metal material 123 may be gold (Au) or silver (Ag).
- the tip 122 may be provided as a metal material 123 for Raman scattering.
- the Raman signal since the signal strength is very small compared to fluorescence or infrared spectroscopy, the Raman signal itself needs to be enhanced. Since the metal material 123 is locally formed at the end of the tip 122, the area of the Raman scattering may be limited when measuring the measurement object to be described below, thereby increasing sensitivity and resolution.
- the light generated by the light source unit 110 is generally larger than the size of the metal material 123 formed at the end of the tip 122. It is possible to improve the resolution by focusing light using a lens or the like, but there may be a limit in the concentration of light in an optical manner. In one embodiment of the present invention, by measuring the measurement target by disposing the tip of the tip 122 in the region of the highest intensity of the incident region of the light reaching the measurement object, it is possible to increase the sensitivity and resolution of the measurement target measurement. .
- Scattered light generated between the metal material 123 and the substrate 160 may be measured by the sensor unit 140.
- the substrate 160 is not limited to the semiconductor substrate and includes all measurement objects.
- the sensor unit 140 may measure the intensity of the changed wavelength before and after scattering generated between the substrate 160 and the metal material 123.
- the intensity of wavelengths changed before and after scattering is measured at various positions while moving the cantilever 121 (S2).
- the cantilever 121 may be moved by the driver 130.
- the driving unit 130 may move the measuring unit 120 finely.
- the driving unit 130 may be a piezo-electric device.
- the driver 130 may obtain data by measuring the intensities of scattered light according to points at which the tip 122 is positioned on the substrate 160.
- the movement path of the tip 122 is shown.
- the movement path of the tip 122 may be any path that can obtain the intensity of scattered light in the incident light region.
- data for five points may be obtained starting from point A and moving in random intervals and directions to point B.
- FIG. 4 data for 25 points starting from the point C, that is, the point where the tip 122 is located until the point D is reached at predetermined intervals, is shown. You can get it.
- FIG. 5 is a curve illustrating the intensity distribution of scattered light according to a-a 'of FIG. 4.
- the intensity distribution of the scattered light may be in the form of a three-dimensional Gaussian function.
- the data may be transmitted to the data processor 150 (S3).
- the data processor 150 may derive a point T having the highest intensity of incident light in the incident light region using the data.
- a method of deriving a point where the intensity of incident light is the highest may use a Gaussian function (S4).
- S4 Gaussian function
- the intensity of the scattered light is large, the intensity of incident light is also large, so that the intensity of the scattered light is measured by measuring the intensity of the scattered light at the position of the tip 122 and the position of the tip 122 on the substrate 160.
- the point (peak: T of the Gaussian function graph) having the highest intensity of the incident light can be derived.
- the tip 122 of the cantilever is moved to a point T where the intensity of the incident light is the highest (S5).
- the relative position of the light source 110 may be in a fixed state.
- sensitivity and resolution may be increased when scanning the substrate 160, which will be described later.
- the tip 122 of the cantilever may be moved to the point where the intensity of the incident light is highest by the driving unit 130.
- the substrate 160 may be scanned while the tip 122 of the cantilever is fixed at a point where the intensity of the incident light is the highest (S6).
- the scanning may be performed by moving the substrate 160 while the relative position of the tip 122 of the cantilever and the light source 110 is fixed.
- the tip 122 of the cantilever and the light source 110 may be simultaneously moved while the relative position is fixed to scan the substrate 160.
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- General Physics & Mathematics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Analytical Chemistry (AREA)
- Radiology & Medical Imaging (AREA)
- Engineering & Computer Science (AREA)
- Nanotechnology (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
Description
Claims (10)
- 광원으로부터 입사광이 조사되는 기판 상의 복수개의 지점들에 캔틸레버의 팁을 제공하는 것;상기 입사광에 의해 상기 캔틸레버의 팁과 상기 기판 사이에서 발생한 산란광의 강도를 측정하는 것;상기 산란광의 강도를 데이터처리부에 입력하여 상기 입사광의 강도가 최고인 지점을 찾는 것; 및상기 캔틸레버의 팁을 상기 입사광의 강도가 최고인 지점으로 이동시키는 것을 포함하는 AFM 측정 방법.
- 제 1 항에 있어서, 상기 캔틸레버의 팁과 상기 광원의 상대적 위치를 고정한 상태로 상기 기판을 이동하며 측정하는 것을 더 포함하는 AFM 측정 방법.
- 제 2 항에 있어서, 상기 데이터처리부는 가우시안함수를 이용하여 상기 입사광의 강도가 최고인 지점을 찾는 것을 특징으로 하는 AFM 측정 방법.
- 제 3 항에 있어서, 상기 데이터처리부는 상기 복수개의 지점들과 상기 복수개의 지점들에서의 상기 산란광의 강도를 가우시안함수 대입하여 상기 입사광의 강도가 최고인 지점을 찾는 것을 특징으로 하는 AFM 측정 방법.
- 제 1 항에 있어서, 상기 복수개의 지점들에 캔틸레버를 제공하는 것은:상기 입사광을 상기 캔틸레버의 팁에 조사하는 것;상기 입사광이 고정된 상태에서 상기 캔틸레버를 이동시키는 것을 포함하는 AFM 측정 방법.
- 광원부;캔틸레버와 상기 캔틸레버의 단부에 제공된 팁을 포함하는 측정부;상기 광원부로부터 입사광이 조사되는 기판 상의 복수개의 지점들로 상기 캔틸레버를 이동시키는 구동부;상기 캔틸레버의 팁과 상기 기판 사이에 발생한 산란광의 강도를 측정하는 센서부; 및상기 산란광의 강도를 입력받아 상기 입사광의 강도가 최고인 지점을 찾는 데이터처리부를 포함하는 AFM 측정 시스템.
- 제 6 항에 있어서, 상기 캔틸레버의 팁은 금속물질로 표면처리되어 있는 것을 특징으로 하는 AFM 측정 시스템.
- 제 7 항에 있어서, 상기 구동부는 추가로 상기 팁을 상기 입사광의 강도가 최고인 지점으로 이동시킬 수 있는 AFM 측정 시스템.
- 제 8 항에 있어서, 상기 데이터처리부는 가우시안함수를 이용하여 상기 입사광의 강도가 최고인 지점을 찾는 것을 특징으로 하는 AFM 측정 시스템.
- 제 9 항에 있어서, 상기 데이터처리부는 상기 복수개의 지점들과 상기 산란광의 강도를 가우시안함수에 대입하여 상기 입사광의 강도가 최고인 지점을 찾는 것을 특징으로 하는 AFM 측정 시스템.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2012515960A JP2012530258A (ja) | 2009-06-17 | 2010-04-05 | Afm測定方法及びafm測定システム |
US13/378,514 US8434159B2 (en) | 2009-06-17 | 2010-04-05 | AFM measuring method and system thereof |
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KR1020090053911A KR101045059B1 (ko) | 2009-06-17 | 2009-06-17 | 에이에프엠 측정 방법 및 에이에프엠 측정 시스템 |
KR10-2009-0053911 | 2009-06-17 |
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WO2010147296A1 true WO2010147296A1 (ko) | 2010-12-23 |
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PCT/KR2010/002073 WO2010147296A1 (ko) | 2009-06-17 | 2010-04-05 | 에이에프엠 측정 방법 및 에이에프엠 측정 시스템 |
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US (1) | US8434159B2 (ko) |
JP (1) | JP2012530258A (ko) |
KR (1) | KR101045059B1 (ko) |
WO (1) | WO2010147296A1 (ko) |
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DE102015209219A1 (de) * | 2015-05-20 | 2016-11-24 | Carl Zeiss Smt Gmbh | Vorrichtung und Verfahren zur Untersuchung einer Oberfläche einer Maske |
CN113567441B (zh) * | 2021-09-27 | 2021-12-28 | 板石智能科技(武汉)有限公司 | 纳米量级物体探测方法、系统、设备及存储介质 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10214868A (ja) * | 1997-01-29 | 1998-08-11 | Shimadzu Corp | Cmp処理の評価方法 |
US20050242283A1 (en) * | 2002-02-05 | 2005-11-03 | Tsuyoshi Hasegawa | Scanning probe microscope and specimen surface structure measuring method |
KR20060002299A (ko) * | 2004-07-01 | 2006-01-09 | 엘지전자 주식회사 | 원자간력 현미경의 자동 이득값 조절방법 |
US20070091977A1 (en) * | 2005-10-12 | 2007-04-26 | Research And Industrial Corporation Group | Method and system for forming periodic pulse patterns |
KR100720456B1 (ko) * | 2004-12-30 | 2007-05-22 | 동부일렉트로닉스 주식회사 | Afm 장치의 레이저 광선의 자동 조준 방법 및 그 장치 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6850323B2 (en) * | 2001-02-05 | 2005-02-01 | California Institute Of Technology | Locally enhanced raman spectroscopy with an atomic force microscope |
US6985223B2 (en) * | 2003-03-07 | 2006-01-10 | Purdue Research Foundation | Raman imaging and sensing apparatus employing nanoantennas |
JP4498081B2 (ja) * | 2004-09-21 | 2010-07-07 | エスアイアイ・ナノテクノロジー株式会社 | 散乱型近接場顕微鏡およびその測定方法 |
WO2009085184A1 (en) * | 2007-12-21 | 2009-07-09 | University Of Akron | Protected metallic tip or metallized scanning probe microscopy tip for optical applications |
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2009
- 2009-06-17 KR KR1020090053911A patent/KR101045059B1/ko active IP Right Grant
-
2010
- 2010-04-05 JP JP2012515960A patent/JP2012530258A/ja active Pending
- 2010-04-05 US US13/378,514 patent/US8434159B2/en not_active Expired - Fee Related
- 2010-04-05 WO PCT/KR2010/002073 patent/WO2010147296A1/ko active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10214868A (ja) * | 1997-01-29 | 1998-08-11 | Shimadzu Corp | Cmp処理の評価方法 |
US20050242283A1 (en) * | 2002-02-05 | 2005-11-03 | Tsuyoshi Hasegawa | Scanning probe microscope and specimen surface structure measuring method |
KR20060002299A (ko) * | 2004-07-01 | 2006-01-09 | 엘지전자 주식회사 | 원자간력 현미경의 자동 이득값 조절방법 |
KR100720456B1 (ko) * | 2004-12-30 | 2007-05-22 | 동부일렉트로닉스 주식회사 | Afm 장치의 레이저 광선의 자동 조준 방법 및 그 장치 |
US20070091977A1 (en) * | 2005-10-12 | 2007-04-26 | Research And Industrial Corporation Group | Method and system for forming periodic pulse patterns |
Also Published As
Publication number | Publication date |
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JP2012530258A (ja) | 2012-11-29 |
KR20100137596A (ko) | 2010-12-31 |
KR101045059B1 (ko) | 2011-06-29 |
US8434159B2 (en) | 2013-04-30 |
US20120117695A1 (en) | 2012-05-10 |
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