WO2023025842A1 - Lame optique biocompatible destinee a la microscopie a reflexion totale interne et systeme d'imagerie microscopique comportant une telle lame - Google Patents
Lame optique biocompatible destinee a la microscopie a reflexion totale interne et systeme d'imagerie microscopique comportant une telle lame Download PDFInfo
- Publication number
- WO2023025842A1 WO2023025842A1 PCT/EP2022/073565 EP2022073565W WO2023025842A1 WO 2023025842 A1 WO2023025842 A1 WO 2023025842A1 EP 2022073565 W EP2022073565 W EP 2022073565W WO 2023025842 A1 WO2023025842 A1 WO 2023025842A1
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- WO
- WIPO (PCT)
- Prior art keywords
- optical
- stack
- internal reflection
- total internal
- optical plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B21/00—Microscopes
- G02B21/16—Microscopes adapted for ultraviolet illumination ; Fluorescence microscopes
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B21/00—Microscopes
- G02B21/06—Means for illuminating specimens
- G02B21/08—Condensers
- G02B21/082—Condensers for incident illumination only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B21/00—Microscopes
- G02B21/34—Microscope slides, e.g. mounting specimens on microscope slides
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/56—Optics using evanescent waves, i.e. inhomogeneous waves
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/26—Reflecting filters
- G02B5/265—Reflecting filters involving total internal reflection
Definitions
- Biocompatible optical slide intended for total internal reflection microscopy and microscopic imaging system comprising such a slide
- the invention falls within the field of optical microscopy. More particularly, the invention relates to a new concept of optical plate based on a multilayer stack as a support for enhancing the electromagnetic field suitable for total internal reflection microscopy.
- the invention applies in particular, but not exclusively, to the field of imaging biological samples by total internal reflection fluorescence microscopy or TIRF (Total Internal Reflection Fluorescence) microscopy.
- TIRF Total Internal Reflection Fluorescence
- Total internal reflection fluorescence (TIRF) microscopy has become a reference technique for studying membrane dynamics and organization in biological cells.
- One of its advantages is the possibility of confining the excitation light to an ultra-thin section of the sample located at the interface between the sample and the glass microscope slide so that selective excitation of the sample can be made. Such a technique thus allows the feasibility of images of single molecules at the nanometric scale.
- the TIRF technique is based on the following principle.
- the biological sample which is placed on the microscope slide (for example a glass substrate) is illuminated through the microscope slide using a laser excitation beam.
- the beam excitation strikes the interface between the glass slide and the sample at an angle of incidence greater than or equal to the critical angle of total internal reflection, one of the electromagnetic components of light, called the evanescent wave, propagates at said interface in an ultra-thin section of the sample, with a light intensity which decreases exponentially with the distance to said interface.
- the penetration depth of the evanescent field is typically less than 100 nm.
- the resulting fluorescence signal - in other words the electromagnetic waves emitted by the observed fluorescent molecules - is then collected towards a light detector for imaging purposes.
- the images obtained have multiple qualities: first of all, they benefit from low background noise (because the fluorophores located in the deep layers of the sample (outside the evanescent field) are only very weakly excited) and a relatively high axial resolution.
- Microscope slides with a more complex structure such as those based on surface metallization, have also been designed to locally enhance the electromagnetic field.
- Such optical plates which are based on the principle of surface plasmon resonance, make it possible to improve the sensitivity of microscopy imaging.
- this known solution remains limited in terms of field enhancement value and in the choice of materials, i.e. noble metals, which limit the usable illumination conditions as well as biocompatibility, which is not optimal.
- an optical plate intended to receive a biological sample for the purposes of total internal reflection microscopic imaging, the optical plate comprising an optically transparent base substrate and a stack of layers of dielectric materials.
- the stack is such that it is placed directly on the base substrate and formed of a succession of pairs of alternating thin layers of a first dielectric material with a high refractive index and a second dielectric material with an index weak refraction capable of producing optical resonance at a predetermined angle of incidence and illumination wavelength of the optical plate in total reflection regime.
- the invention is based on a new design of an optical plate for performing total internal reflection microscopy.
- a stack of dielectric multilayers coupled to the base substrate makes it possible to ensure a significant enhancement of the evanescent electromagnetic field propagating at the interface between the plate and the sample at the level of the contact layer.
- This kind of “dielectric resonator” is therefore designed to amplify by optical resonance the light intensity of the evanescent waves confined to the surface of the optical plate in contact with the sample. Thanks to this approach, the sensitivity of microscopic imaging as well as the spatial resolution are improved. It also appears, compared to the existing plasmon resonance slides, that this type of proposed optical slide is more easily exploitable because it adapts to a greater range of TIR microscopy imaging parameters.
- the layer of said stack intended to be in contact with the sample (known as the contact or end layer), is based on a third biocompatible dielectric material having an absorption coefficient of between 1 ⁇ 10 8 and lxlO' 2 .
- This range of values allows optimum operation of the blade.
- the inventors have in fact discovered that the absorption coefficient of the end layer is a key parameter for controlling the amplitude of the evanescent electromagnetic field at the interface with the sample.
- the first dielectric material has a high refractive index between 1.8 and 3.5 and the second material dielectric has a low refractive index between 1.2 and 1.7.
- the third material for its part, has a low or high refractive index depending on the refractive index of the thin layer preceding the end layer (in order to respect the alternation of indices of the stack).
- the invention offers a relatively wide choice of refractive indices that can be used to design the dielectric resonator.
- the thin layers each have a thickness which is a function of the illumination wavelength, of the angle of incidence and of the refractive index of the material for which it is made. It is thus possible to easily design an optical slide whatever the imaging parameters imposed by the TIR microscopy system.
- the optically transparent substrate is based on a material belonging to the following group: Soda-lime glass, Sapphire, Quartz, Calcium fluoride.
- the first dielectric material is based on Nb 2 O 5 and the second dielectric material is based on SiO 2 and the third dielectric material is based on SiO 2 or SiO x .
- the thickness of each thin layer is between 1 and 300 nanometers, and more particularly between 75 and 150 nanometers, while the thickness of the base substrate is between 50 and 2000 micrometers .
- the stack has a total thickness of less than 10 micrometers, and more particularly between 0.2 and 4.0 micrometers.
- the stack comprises a number of thin layers typically between 4 and 20.
- a total internal reflection microscopy system comprising:
- a light source configured to emit an illuminating beam
- the microscope slide and objective being configured so that the angle of incidence is greater than or equal to a critical angle of total internal reflection. It is recalled that the angle of incidence corresponds to the angle comprised between the axis of the lighting beam and the stacking axis of the optical plate. It should be noted that the closer the chosen angle of incidence values are to the upper limit of the aforementioned range, the more the axial resolution of the system is increased.
- the angle of incidence is less than or equal to a limit value defined by the numerical aperture of the microscope objective. More precisely, the angle of incidence is between 62 and 80 degrees.
- a method of manufacturing an optical slide intended to receive a biological sample for total internal reflection microscopic imaging purposes comprising:
- - a step of depositing on an optically transparent base substrate a plurality of successive and alternating thin layers of a first dielectric material and of a second dielectric material so as to form a stack of dielectric multilayers capable of producing optical resonance at a predetermined angle of incidence and wavelength of illumination of the optical plate in total reflection regime, the layer of said stack intended to be in contact with the sample being based on a biocompatible dielectric material.
- FIG. 1 is a simplified diagram of a total internal reflection microscopy system according to a particular embodiment of the invention
- FIG. 2 shows a first example of an optical plate according to the invention that can be used in the imaging system of Figure 1;
- FIG. 3 shows a second example of an optical plate according to the invention that can be used in the imaging system of Figure 1.
- FIG. 1 schematically represents a total internal reflection microscopy system 100, according to a particular embodiment of the invention.
- a system comprises an optical slide 10, a microscope objective 20, a light source 30 and a light detector 40.
- the optical plate 10 is a biocompatible plate intended to receive a biological sample E for microscopy imaging purposes according to a total internal reflection configuration.
- An example of an optical plate structure in accordance with the invention is described below in relation to FIG. 2.
- the microscope objective 20 is a large aperture objective, typically greater than or equal to 1.45. It comprises optics or a more or less complex assembly of optical lenses able to allow the formation of the lighting beam in the direction of the optical plate and to collect the reflected and/or backscattered beam coming from the optical plate along an optical axis OA.
- the microscope objective 20 can be variable focal length and variable numerical aperture (greater than 1.45).
- the light source 30 is a laser source configured to emit a laser light beam of predetermined wavelength X (typically equal to 561 nm, but more generally between 350 and 1300 nm), able to excite the molecules contained in the sample.
- predetermined wavelength X typically equal to 561 nm, but more generally between 350 and 1300 nm
- the light detector 40 is a CCD or CMOS camera whose spectral band is adapted to the detection of the light by fluorescence re-emitted from the sample E (this light by fluorescence being at a wavelength different from the length d excitation wave X). It converts the light intensity received into an electrical signal intended for a processing unit (not shown in the figures).
- the processing unit is electrically connected to the light source 30, to the light detector 40 and to the microscope objective 20 so as to be able to control these elements for the purpose of acquiring images of the sample E in total internal reflection regime.
- the microscopy system 100 presented here is based on the principle of epifluorescence, the observation of the fluorescence of which is carried out in a configuration by reflection by means of a blade or a dichroic mirror 50 for example.
- This particular configuration makes it possible to dissociate the optical path taken by the excitation light from the optical path taken by the reflected and/or backscattered light.
- the optical plate 10 has a first face, called the free face F1, and a second face, opposite the first, called the incident face Fi, and defines a stacking axis Z extending between these two opposite faces.
- the free face F1 is intended to receive the biological sample E to be observed and the incident face Fi is the incident face of the illuminating light.
- F1 constitutes the free interface where an enhancement of the electromagnetic field can be supported by the optical plate 10.
- the optical slide 10 and the microscope objective 20 are arranged so that the stacking axis Z of the slide coincides with the optical axis OA.
- the optical blade 10 and the microscope objective 20 are oriented relative to each other so that the optical interface formed between the optical blade 10 and the sample E is perpendicular to the optical axis OA.
- the microscope objective 20 is configured so that the angle of incidence ⁇ of the illumination beam (defined between the axis of the illumination beam and the stacking axis Z), is greater than or equal to the critical angle of total internal reflection, typically an angle of incidence between 62 and 80 degrees for a biological environment with a refractive index between 1.33 and 1.35.
- the optical slide 10 comprises a base substrate of optically transparent material 11, such as for example a soda-lime glass microscope slide with an index of 1.5 (or any other optically transparent support calibrated in thickness), on which is arranged a stack of thin dielectric layers 12 serving as a support for the enhancement of the electromagnetic field in total internal reflection regime.
- this stack 12 is formed of a succession of several alternating thin layers of a first dielectric material with a high refractive index (thin layers referenced MD1) and a second dielectric material with a low refractive index (thin layers referenced MD2).
- the stack is generally presented in the planar form of eight thin layers covering all or part of the base substrate 11.
- the dielectric material MD1 selected is based on Nb 2 O 5 and the dielectric material MD2 is based on SiO 2 .
- the thin layer intended to be in contact with the sample E is based on a biocompatible dielectric material, such as based on Nb 2 Os as in the example illustrated here, or else based on SiO 2 typically.
- the upper face of this free layer CL corresponding to said free face F1 discussed above.
- the incident face Fi it corresponds to the lower face of the base substrate 11.
- the thickness of the thin layers MD1 and MD2 is chosen as a function of the illumination wavelength X, of the angle of incidence of the illumination beam and of the refractive index of the material of which it is made.
- the thickness of the thin layers is generally between 1 and 300 nanometers.
- the thickness of the base substrate 11 is between 50 and 2000 micrometers and the total thickness of the dielectric stack 12 is generally less than 10 micrometers.
- the total thickness of the dielectric stack 12 is preferably between 0.2 and 4 micrometers.
- the thickness, the number and the nature of the thin layers of said stack can be adapted on a case-by-case basis, depending in particular on the imaging conditions of the system, such as the X-ray illumination wavelength and the angle of incidence e.
- a number of thin layers comprised between 4 and 20 can be envisaged without departing from the scope of the invention.
- the number of dielectric thin layers is chosen according to the intended application, the nature of the materials, the lighting conditions imposed by the microscopy system used and the desired field enhancement factor.
- the evanescent wave created by the base substrate 11 and which propagates at said interface sees its luminous intensity amplified thanks to the dielectric stack 12.
- the inventors have observed that the presence of such a multilayer structure affixed directly to a glass substrate induces, by optical resonance, an enhancement of the evanescent electromagnetic field at the surface of said optical plate (that is to say at the free interface F1), making it possible to significantly increase microscopy imaging performance TIRF, especially in terms of sensitivity and spatial resolution.
- the fluorescence light from sample E is then picked up by the light detector 40 via the dichroic mirror 50, then processed for imaging purposes.
- the value of the angle of incidence ⁇ can therefore be optimized according to the desired performance and the constraints imposed by the system.
- the lower limit of the aforementioned range (62 degrees) is given by the refractive index value of the sample studied.
- the upper limit of the aforementioned range (80 degrees) it is defined according to the value of the numerical aperture used for the microscopy observation.
- the end layer d 'stack 12' intended to be in contact with the sample E is based on a biocompatible dielectric material MD3 having a characteristic complex refractive index, the value of the imaginary part of which is chosen to maximize the light intensity of the evanescent field To the slide/sample interface.
- the value of the absorption coefficient is between 1 ⁇ 10 ⁇ 8 and 1 ⁇ 10 ⁇ 2 , the principle being to favor the lowest possible absorption coefficient for the end layer.
- Such an approach makes it possible, by playing on the absorption of the end layer, to control the amplitude of the evanescent field, and therefore the intensity of the fluorescence signal arriving at the detector (and thus to improve the performance of TIRF microscopy imaging).
- the method consists in depositing, on a glass substrate plate, such as a microscopy slide for example, a plurality of successive and alternating thin layers of a first dielectric material and a second dielectric material of so as to constitute a stack of dielectric multilayers (such as the dielectric stack 12 for example).
- the nature, the thickness and the number of thin layers for each of the two dielectric materials are previously determined so that the resonator thus obtained is able to support a surface optical resonance mode (according to the principle mentioned above) at the illumination wavelength X and the angle of incidence 0 in the total internal reflection regime.
- each thin layer is carried out by means of one of the following techniques (without being exhaustive): vacuum evaporation, vacuum spraying, sol-gel process, spin coating, chemical vapor deposition, plasma deposition.
- the invention thus offers the possibility of producing optical slides with electromagnetic field enhancement, the characteristics of which can be easily adapted according to the imaging parameters required by the microscopy system.
- the thickness, the number and the type of material are characteristics of the stack according to the invention which can be adapted on a case-by-case basis, depending in particular on the imaging parameters of the system and the operating conditions. desired or imposed lighting.
- Preference will be given to materials that are optically transparent in the spectral band used to carry out the study, for which the dispersion values of the refractive index and of the absorption coefficient are known and controlled.
- Such characteristics must allow, at a predetermined angle of incidence and wavelength of illumination of the optical blade in total reflection regime, optical absorption in the free layer of the stack enhancing the evanescent electromagnetic field at the stacking free interface.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Microscoopes, Condenser (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
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Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18/685,292 US20240353666A1 (en) | 2021-08-24 | 2022-08-24 | Biocompatible optical slide intended for total internal reflection microscopy and microscopy imaging system including such a slide |
| EP22768798.5A EP4392762A1 (fr) | 2021-08-24 | 2022-08-24 | Lame optique biocompatible destinee a la microscopie a reflexion totale interne et systeme d'imagerie microscopique comportant une telle lame |
| JP2024510673A JP2024530720A (ja) | 2021-08-24 | 2022-08-24 | 全反射顕微鏡法用の生体適合性光学スライド、およびかかるスライドを含む顕微鏡イメージングシステム |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2108879A FR3126508A1 (fr) | 2021-08-24 | 2021-08-24 | Lame optique biocompatible destinée à la microscopie à réflexion totale interne et système d’imagerie microscopique comportant une telle lame |
| FRFR2108879 | 2021-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2023025842A1 true WO2023025842A1 (fr) | 2023-03-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2022/073565 Ceased WO2023025842A1 (fr) | 2021-08-24 | 2022-08-24 | Lame optique biocompatible destinee a la microscopie a reflexion totale interne et systeme d'imagerie microscopique comportant une telle lame |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20240353666A1 (fr) |
| EP (1) | EP4392762A1 (fr) |
| JP (1) | JP2024530720A (fr) |
| FR (1) | FR3126508A1 (fr) |
| WO (1) | WO2023025842A1 (fr) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160238830A1 (en) | 2015-02-12 | 2016-08-18 | Penn State Research Foundation | Waveguides for enhanced total internal reflection fluorescence microscopy |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001242083A (ja) * | 2000-03-01 | 2001-09-07 | Hamamatsu Photonics Kk | 光増強方法、光増強装置、及びそれを用いた蛍光測定方法、蛍光測定装置 |
| US7285789B2 (en) * | 2003-06-06 | 2007-10-23 | Oc Oerlikon Balzers Ag | Optical device for surface-generated fluorescence |
| US20060181791A1 (en) * | 2003-07-31 | 2006-08-17 | Van Beek Michael C | Method and apparatus for determining a property of a fluid which flows through a biological tubular structure with variable numerical aperture |
| JP2006038816A (ja) * | 2004-07-30 | 2006-02-09 | Nara Institute Of Science & Technology | マイクロアレイ読取装置 |
| JP2013122395A (ja) * | 2011-12-09 | 2013-06-20 | Asahi Glass Co Ltd | バイオ分析用基板および反応容器 |
| US10107807B2 (en) * | 2014-05-22 | 2018-10-23 | The University Of Maryland, Baltimore | One dimensional photonic crystals for enhanced fluorescence based sensing, imaging and assays |
| KR101745897B1 (ko) * | 2016-08-31 | 2017-06-20 | 경희대학교 산학협력단 | 전반사산란을 이용한 바이러스의 정량 스크리닝 방법 |
-
2021
- 2021-08-24 FR FR2108879A patent/FR3126508A1/fr active Pending
-
2022
- 2022-08-24 US US18/685,292 patent/US20240353666A1/en active Pending
- 2022-08-24 WO PCT/EP2022/073565 patent/WO2023025842A1/fr not_active Ceased
- 2022-08-24 EP EP22768798.5A patent/EP4392762A1/fr active Pending
- 2022-08-24 JP JP2024510673A patent/JP2024530720A/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160238830A1 (en) | 2015-02-12 | 2016-08-18 | Penn State Research Foundation | Waveguides for enhanced total internal reflection fluorescence microscopy |
Non-Patent Citations (1)
| Title |
|---|
| JIAN GAO ET AL: "Polarization multiplexed fluorescence enhancer using a pixelated one-dimensional photonic band gap structure", OPTICS LETTERS, OPTICAL SOCIETY OF AMERICA, US, vol. 37, no. 13, 1 July 2012 (2012-07-01), pages 2640 - 2642, XP001576868, ISSN: 0146-9592, [retrieved on 20120625], DOI: 10.1364/OL.37.002640 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20240353666A1 (en) | 2024-10-24 |
| JP2024530720A (ja) | 2024-08-23 |
| FR3126508A1 (fr) | 2023-03-03 |
| EP4392762A1 (fr) | 2024-07-03 |
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