WO2004029595A1 - 表面プラズモン励起装置とそれを含む顕微鏡 - Google Patents
表面プラズモン励起装置とそれを含む顕微鏡 Download PDFInfo
- Publication number
- WO2004029595A1 WO2004029595A1 PCT/JP2003/011460 JP0311460W WO2004029595A1 WO 2004029595 A1 WO2004029595 A1 WO 2004029595A1 JP 0311460 W JP0311460 W JP 0311460W WO 2004029595 A1 WO2004029595 A1 WO 2004029595A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- surface plasmon
- thin film
- metal thin
- excitation device
- Prior art date
Links
- 230000005284 excitation Effects 0.000 title claims abstract description 27
- 229910052751 metal Inorganic materials 0.000 claims abstract description 81
- 239000002184 metal Substances 0.000 claims abstract description 81
- 239000010409 thin film Substances 0.000 claims abstract description 48
- 239000000758 substrate Substances 0.000 claims abstract description 15
- 230000002093 peripheral effect Effects 0.000 claims abstract description 3
- 238000005259 measurement Methods 0.000 claims description 12
- 230000001678 irradiating effect Effects 0.000 claims description 8
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052737 gold Inorganic materials 0.000 claims description 4
- 239000010931 gold Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 2
- 230000005855 radiation Effects 0.000 abstract 2
- 238000002834 transmittance Methods 0.000 abstract 2
- 238000002198 surface plasmon resonance spectroscopy Methods 0.000 description 5
- 230000005684 electric field Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000007654 immersion Methods 0.000 description 2
- 238000000018 DNA microarray Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000003574 free electron Substances 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/55—Specular reflectivity
- G01N21/552—Attenuated total reflection
- G01N21/553—Attenuated total reflection and using surface plasmons
Definitions
- the present invention relates to an improvement in a device for surface excitation and a microscope including the surface plasmon excitation device.
- FIG. 6 is a schematic cross-sectional view showing a basic device for generating surface plasmon resonance.
- This device includes a light source 101, light converging means 102 for converging light emitted from the light source, a triangular prism 103 formed of a transparent dielectric, and a triangular prism. It includes a metal thin film 104 formed on the surface, and a photodetector 105 for detecting light reflected by the metal thin film.
- the p-polarized light emitted from the light source 101 is converged by the light converging means 102, passes through the triangular prism 103, and is condensed on the metal thin film 104 at an incident angle ⁇ Is done.
- the p-polarized light means linearly polarized light in which the vibration direction of the electric vector of light incident on the surface of the object is included in a plane including the normal to the surface and the traveling direction of the light.
- the light condensed on the metal thin film 104 has some light that satisfies the resonance conditions on the surface: It resonates to generate an evanescent field 106 enhanced on the free surface side of the metal thin film 104, and the other light is reflected and detected by the photodetector 105.
- the graph shown in FIG. 7 is obtained.
- the horizontal axis represents the light incident angle ⁇
- the vertical axis represents the reflectance (%).
- the amount of light received by the photodetector 105 is minimal at a specific angle of incidence ⁇ s, and at this angle of incidence, it can be seen that part of the convergent light resonates with the surface plasmon. .
- FIG. 8 is a schematic sectional view of a basic microscope using surface plasmons.
- a light source 201 a beam expander (lenses 202, 203) that expands the parallel light emitted from the light source, and a collimated light expanded by the beam expander
- a light converging means 204 for converting light a prism 205 for coupling light, a metal thin film 206 formed on one surface of the prism 205, and a gap between the metal thin film and an immersion oil.
- Pulse stage 210 is included.
- the parallel light emitted from the light source 201 is expanded by the beam expanders 202 and 203, converted into convergent light by the light converging means 204, and transmitted through the prism 205 to the metal.
- the light is focused on the thin film 206.
- the light with a specific angle of incidence determined by the film thickness and refractive index of the metal thin film 206, the image layer 207, and the measurement sample 208 excites surface plasmons .
- the light reflected by the metal thin film 206 without exciting the surface plasmon is observed by the photodetector 209. Coordinates whose amount of reflected light has decreased due to excitation of surface plasmons are detected on the photodetector 209, and the excitation angle of the surface plasmons is determined from the coordinates to obtain the refractive index of the sample 208. The change can be measured. Further, by running the measurement sample 208 using the XY pulse stage 210, it becomes possible to measure the two-dimensional refractive index distribution of the sample.
- the device of FIG. 6 or FIG. 8 surface plasmons are excited. Area depends on the spot size of the collected light. For example, in FIG. 6, when the wavelength of the light source 101 is 65 O nm and the NA (numerical aperture) of the light converging means 102 is 0.6, the light beam can be emitted only up to a diameter of about 1 / m. I can't squeeze. Therefore, the microscope shown in Fig. 8 can only obtain a resolution of about 1 m. In other words, the resolution limit of the microscope is determined by the diffraction limit of the light emitted from the light source.
- an object of the present invention is to provide a device capable of exciting surface plasmons in a minute region and a high-resolution microscope using the device.
- the surface plasmon excitation device includes: a light irradiating unit; a light-transmitting substrate having a protrusion; a metal layer covering side and peripheral portions of the protrusion; and a metal thin film formed on a top surface of the protrusion.
- An evanescent wave caused by light transmitted through the metal thin film from the light irradiation means via the light-transmitting substrate can excite surface plasmons to a metal thin J] smell.
- the projection of the substrate is formed in a belt shape, and the light irradiated by the light irradiating means is preferably linearly polarized in a plane including the longitudinal direction and the normal direction of the top surface of the belt-shaped projection. . Further, the light irradiated by the light irradiation means is preferably convergent light.
- the dimensions and shape of the protrusion, its refractive index, and the metal layer are set so that the light irradiated to the protrusion by the light irradiation means reaches the metal thin film in a region smaller than the width of the protrusion. Is preferred.
- the metal layer is formed of a good conductor, and the metal thin film is formed of any of gold, silver, copper, and aluminum.
- the surface plasmon microscope according to the present invention includes the above-described surface plasmon excitation device, A photodetector that receives light reflected by the metal thin film and the metal layer included in the device described in (1), a sample moving means for arranging the surface of the measurement sample in proximity to the metal thin film and scanning the sample surface; Contains. BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is a schematic sectional view showing a surface plasmon excitation device according to an embodiment of the present invention.
- FIG. 2 is a schematic perspective view showing the surface plasmon excitation device according to the embodiment of the present invention.
- FIG. 3 is a schematic cross-sectional view showing a region where light can exist in the surface plasmon excitation device according to the embodiment of the present invention.
- FIG. 4 is a graph showing the relationship between the depth of the metal groove and the intensity of the reflected light in the surface plasmon excitation device according to the embodiment of the present invention.
- FIG. 5 is a schematic sectional view showing a surface plasmon microscope according to the embodiment of the present invention.
- FIG. 6 is a cross-sectional view showing a conventional surface plasmon excitation device.
- FIG. 7 is a graph showing the relationship between the incident angle of light and the reflectance in a conventional surface plasmon excitation device.
- FIG. 8 is a cross-sectional view showing a conventional surface plasmon microscope. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 A cross-sectional view of FIG. 1 and a perspective view of FIG. 2 schematically illustrate a surface plasmon excitation device according to an embodiment of the present invention.
- Fig. 1 corresponds to the cross section of the XZ plane in Fig. 2.
- the same reference numerals indicate the same or corresponding parts.
- This surface plasmon excitation device includes a light irradiating means 1, a light-transmitting substrate 2 having a band-shaped protrusion, a metal layer 3 formed so as to cover the side surface of the protrusion and the periphery thereof, and a top surface of the protrusion. And a metal thin film 4 formed thereon.
- the metal layer 3 and the metal thin film 4 have little change over time and shorten the propagation distance of surface plasmon. Can be preferably used.
- the metal thin film 4 is formed to have a thickness such that incident light is transmitted through the metal thin film 4 to generate an evanescent field in order to excite surface plasmons.
- the convergent light radiated from the light irradiation means 1 and linearly polarized in the X-z plane passes through the substrate 2 and enters the projection.
- the light emitted from the light irradiating means 1 is set so as to be incident at an angle ss at which the surface plasmon is excited in the metal thin film 4 formed on the top surface of the protrusion.
- the dimensions and shape of the cross section of the projection formed in a strip shape, and the materials of the metal layer 3 and the metal thin film 4 are set so that the incident light reaches the minute area on the metal thin film 4.
- the light that reaches the minute region of the metal thin film 4 formed on the top surface of the protrusion and is linearly polarized in the X-z plane generates an evanescent wave 5 emphasized by surface plasmon resonance.
- the evanescent wave propagates along the air-side surface of the metal thin film 4 in the 1X direction.
- FIG. 3 shows a region where light can exist in the protrusion when hatched light linearly polarized in the X- Z plane is incident on the substrate 2 by hatching.
- the metal layer is located near the side a of the metal layer.
- An electric field parallel to side a cannot exist.
- a region where light can exist decreases.
- the height d of the projection is larger than a certain value, the light cannot reach the middle of the projection and can penetrate.
- the refractive index n of the substrate is 1.58, the width of the metal groove is 250 nm, the medium forming the metal groove is gold, and the wavelength of the incident light; I is 650 nm.
- the NA of the objective lens is 0.6 and the angle of incidence of light on the bottom of the metal groove is 0 ° (that is, perpendicular to the substrate surface)
- the incident light can be reduced to a metal thin film. It is possible to form a projection that reaches only the minute region w1 of 4. In this example, the case where the incident angle is 0 ° is shown. However, even when the incident angle is set to 0 s, it is possible to form a projection that allows the incident light to reach only the minute area w1 of the metal thin film 4. It is.
- surface plasmons having a width smaller than the width of the protrusion can be excited regardless of the size of the incident light.
- the resolution can be increased.
- FIG. 5 illustrates a surface plasmon microscope according to another embodiment of the present invention.
- a light irradiating means 1 a substrate 2 having a strip-shaped protrusion, a metal layer 3 formed so as to cover a side surface of the protrusion, and a metal thin film 4 formed on the top surface of the protrusion are shown.
- the gap between the photodetector 5 that detects light reflected by the metal layer 3 and the metal thin film 4 and the metal thin film 4 is filled with a matching oil (not shown).
- a measurement sample 6 and a moving stage 7 for scanning the measurement sample are shown.
- the convergent light emitted from the light irradiation means 1 passes through the substrate 2 and is focused on the metal thin film 4.
- the condensed light light at a specific incident angle determined by the thickness and refractive index of the metal thin film 4, the immersion oil, and the measurement sample 6 excites surface plasmons.
- the light reflected by the metal layer 3 and the metal thin film 4 without exciting the surface plasmon is observed by the photodetector 5.
- the coordinates at which the amount of reflected light is reduced by exciting the surface plasmon are detected on the photodetector 5 and the excitation angle of the surface plasmon is determined from the coordinates, whereby the refractive index of the measurement sample 6 can be measured. .
- a two-dimensional refractive index distribution can be measured. For example, when there is a minute region 6a having a locally different refractive index in the sample 6, the position of the minute region having a different refractive index can be detected. At this time, the area of the surface plasmon excited by the surface plasmon excitation device is limited to an area smaller than the width of the projection due to the structure of the projection, so that the resolution is improved compared to the conventional microscope. be able to.
- the surface plasmon excitation device including the band-shaped protrusion is described.
- a protrusion whose length is limited in the X direction such as an information pit of an optical disk, may be used.
- the propagation distance of the surface plasmon (or the enhanced evanescent wave) can be limited, so that the region where the surface plasmon is excited can be further reduced in the X direction.
- the size of the region where light reaches the metal thin film formed on the top surface of the protrusion is controlled by changing the height d of the protrusion having a rectangular cross section.
- it can also be controlled by changing the width w of the protrusion, the metal medium, the cross-sectional shape of the protrusion, and the like.
- the area in which surface plasmons are generated can be reduced, so that it is possible to perform sensing in a micro area by applying to a sensor for measuring a change in refractive index, for example. Furthermore, by arranging the projections in an array and correspondingly arranging the samples in an array, it becomes possible to measure the refractive index change of a very large number of samples in a very small area. In addition, By applying the light to a device that measures the fluorescence reaction, such as a biochip, it becomes possible to detect the fluorescence of the measurement target that is densely arranged in a very small area like a sensor. Industrial applicability
- the present invention it is possible to provide a device capable of exciting surface plasmons in a minute region and a high-resolution microscope using the device.
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/526,643 US7227643B2 (en) | 2002-09-26 | 2003-09-08 | Surface plasmon excitation device and microscope including the same |
AU2003264395A AU2003264395A1 (en) | 2002-09-26 | 2003-09-08 | Surface plasmon excitation device and microscope including the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002281126A JP3885017B2 (ja) | 2002-09-26 | 2002-09-26 | 表面プラズモン励起装置とそれを含む顕微鏡 |
JP2002-281126 | 2002-09-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004029595A1 true WO2004029595A1 (ja) | 2004-04-08 |
Family
ID=32040505
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/011460 WO2004029595A1 (ja) | 2002-09-26 | 2003-09-08 | 表面プラズモン励起装置とそれを含む顕微鏡 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7227643B2 (ja) |
JP (1) | JP3885017B2 (ja) |
AU (1) | AU2003264395A1 (ja) |
WO (1) | WO2004029595A1 (ja) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7151598B2 (en) * | 2003-04-04 | 2006-12-19 | Vladimir Poponin | Method and apparatus for enhanced nano-spectroscopic scanning |
US20080037022A1 (en) * | 2004-02-13 | 2008-02-14 | Takeo Nishikawa | Surface Plasmon Resonance Sensor |
KR100738078B1 (ko) * | 2005-10-12 | 2007-07-12 | 삼성전자주식회사 | 근접장광발생장치와 이를 채용한 열보조 자기기록헤드 |
JP4882646B2 (ja) | 2006-10-02 | 2012-02-22 | ソニー株式会社 | 近接場光発生装置、近接場光発生方法及び情報記録再生装置 |
JP5007651B2 (ja) * | 2007-02-08 | 2012-08-22 | ソニー株式会社 | 近接場光発生装置、近接場光発生方法及び情報記録再生装置 |
JP4712004B2 (ja) * | 2007-06-21 | 2011-06-29 | パナソニック株式会社 | 微小径光作製装置 |
JP5291378B2 (ja) * | 2008-05-15 | 2013-09-18 | スタンレー電気株式会社 | フォトカソード装置 |
WO2011045890A1 (ja) * | 2009-10-15 | 2011-04-21 | 株式会社アドバンテスト | 受光装置、受光装置の製造方法、および受光方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05240787A (ja) * | 1991-03-08 | 1993-09-17 | Rikagaku Kenkyusho | 表面プラズモン顕微鏡 |
JPH06167443A (ja) * | 1992-10-23 | 1994-06-14 | Olympus Optical Co Ltd | 表面プラズモン共鳴を利用した測定装置 |
JP2001311685A (ja) * | 2000-04-28 | 2001-11-09 | Shimadzu Corp | 板状プリズムを用いた分光方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1321488C (en) | 1987-08-22 | 1993-08-24 | Martin Francis Finlan | Biological sensors |
JPH09292334A (ja) * | 1996-04-30 | 1997-11-11 | Fuji Photo Film Co Ltd | 表面プラズモンセンサー |
US7113474B2 (en) * | 2001-09-01 | 2006-09-26 | Energy Conversion Devices, Inc. | Increased data storage in optical data storage and retrieval systems using blue lasers and/or plasmon lenses |
-
2002
- 2002-09-26 JP JP2002281126A patent/JP3885017B2/ja not_active Expired - Fee Related
-
2003
- 2003-09-08 AU AU2003264395A patent/AU2003264395A1/en not_active Abandoned
- 2003-09-08 WO PCT/JP2003/011460 patent/WO2004029595A1/ja active Application Filing
- 2003-09-08 US US10/526,643 patent/US7227643B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05240787A (ja) * | 1991-03-08 | 1993-09-17 | Rikagaku Kenkyusho | 表面プラズモン顕微鏡 |
JPH06167443A (ja) * | 1992-10-23 | 1994-06-14 | Olympus Optical Co Ltd | 表面プラズモン共鳴を利用した測定装置 |
JP2001311685A (ja) * | 2000-04-28 | 2001-11-09 | Shimadzu Corp | 板状プリズムを用いた分光方法 |
Non-Patent Citations (1)
Title |
---|
OKAMOTO, T ET AL: "Surface plasmon microscope with electronic angular scanning.", RIKEN REVIEW, no. 1, April 1993 (1993-04-01), pages 17 - 18, XP002975851 * |
Also Published As
Publication number | Publication date |
---|---|
AU2003264395A1 (en) | 2004-04-19 |
US20060139921A1 (en) | 2006-06-29 |
JP2004117181A (ja) | 2004-04-15 |
JP3885017B2 (ja) | 2007-02-21 |
US7227643B2 (en) | 2007-06-05 |
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