1
|
Shakhov PV, Tikhonowski GV, Popov AA, Iliasov AR, Petrunya DS, Lebedev AA, Klimentov SM, Zavestovskaya IN, Kabashin AV. Cytotoxicity of Laser-Synthesized Nanoparticles of Elemental Bismuth. Bull Exp Biol Med 2024; 176:501-504. [PMID: 38491259 DOI: 10.1007/s10517-024-06055-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Indexed: 03/18/2024]
Abstract
High X-ray absorption combined with photothermal properties make bismuth nanoparticles (Bi NP) a promising agent for multimodal cancer theranostics. However, the synthesis of Bi NP by the "classical" chemical methods has numerous limitations, including potential toxicity of the produced nanomaterials. Here we studied in vitro toxicity of laser-synthesized Bi NP coated with Pluronic F-127 on mouse fibroblast cell line L929. The survival of L929 cells decreased linearly with increasing the concentration of Bi NP in a concentration range of 3-500 μg/ml; the LC50 value was 57 μg/ml. The unique combination of functional properties and moderate toxicity of the laser-synthesized Bi NP makes them a new promising platform for sensitization of multimodal cancer theranostics.
Collapse
Affiliation(s)
- P V Shakhov
- National Research Nuclear University MEPhI, Moscow, Russia.
| | | | - A A Popov
- National Research Nuclear University MEPhI, Moscow, Russia
| | - A R Iliasov
- National Research Nuclear University MEPhI, Moscow, Russia
| | - D S Petrunya
- P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia
| | - A A Lebedev
- National Research Nuclear University MEPhI, Moscow, Russia
| | - S M Klimentov
- National Research Nuclear University MEPhI, Moscow, Russia
| | - I N Zavestovskaya
- P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia
| | - A V Kabashin
- LP3 Laboratory, Aix-Marseille University, CNRS, Marseille, France
| |
Collapse
|
2
|
Petriev VM, Tischenko VK, Mikhailovskaya AA, Popov AA, Tselikov G, Zelepukin I, Deyev SM, Kaprin AD, Ivanov S, Timoshenko VY, Prasad PN, Zavestovskaya IN, Kabashin AV. Nuclear nanomedicine using Si nanoparticles as safe and effective carriers of 188Re radionuclide for cancer therapy. Sci Rep 2019; 9:2017. [PMID: 30765778 PMCID: PMC6376125 DOI: 10.1038/s41598-018-38474-7] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Accepted: 11/19/2018] [Indexed: 11/25/2022] Open
Abstract
Nuclear nanomedicine, with its targeting ability and heavily loading capacity, along with its enhanced retention to avoid rapid clearance as faced with molecular radiopharmaceuticals, provides unique opportunities to treat tumors and metastasis. Despite these promises, this field has seen limited activities, primarily because of a lack of suitable nanocarriers, which are safe, excretable and have favorable pharmacokinetics to efficiently deliver and retain radionuclides in a tumor. Here, we introduce biodegradable laser-synthesized Si nanoparticles having round shape, controllable low-dispersion size, and being free of any toxic impurities, as highly suitable carriers of therapeutic 188Re radionuclide. The conjugation of the polyethylene glycol-coated Si nanoparticles with radioactive 188Re takes merely 1 hour, compared to its half-life of 17 hours. When intravenously administered in a Wistar rat model, the conjugates demonstrate free circulation in the blood stream to reach all organs and target tumors, which is radically in contrast with that of the 188Re salt that mostly accumulates in the thyroid gland. We also show that the nanoparticles ensure excellent retention of 188Re in tumor, not possible with the salt, which enables one to maximize the therapeutic effect, as well as exhibit a complete time-delayed conjugate bioelimination. Finally, our tests on rat survival demonstrate excellent therapeutic effect (72% survival compared to 0% of the control group). Combined with a series of imaging and therapeutic functionalities based on unique intrinsic properties of Si nanoparticles, the proposed biodegradable complex promises a major advancement in nuclear nanomedicine.
Collapse
Affiliation(s)
- V M Petriev
- MEPhI, Institute of Engineering Physics for Biomedicine (PhysBio), 115409, Moscow, Russia
- National Medical Research Radiological Center of the Ministry of Health of the Russian Federation, Obninsk, Russia
| | - V K Tischenko
- National Medical Research Radiological Center of the Ministry of Health of the Russian Federation, Obninsk, Russia
| | - A A Mikhailovskaya
- National Medical Research Radiological Center of the Ministry of Health of the Russian Federation, Obninsk, Russia
| | - A A Popov
- Aix Marseille Univ, CNRS, LP3, Campus de Luminy - Case 917, 13288, Marseille, France
| | - G Tselikov
- Aix Marseille Univ, CNRS, LP3, Campus de Luminy - Case 917, 13288, Marseille, France
| | - I Zelepukin
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 16/10 Miklukho-Maklaya St, Moscow, 117997, Russia
| | - S M Deyev
- MEPhI, Institute of Engineering Physics for Biomedicine (PhysBio), 115409, Moscow, Russia
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 16/10 Miklukho-Maklaya St, Moscow, 117997, Russia
- National Research Tomsk Polytechnic University, Tomsk, Russia
| | - A D Kaprin
- National Medical Research Radiological Center of the Ministry of Health of the Russian Federation, Obninsk, Russia
| | - S Ivanov
- National Medical Research Radiological Center of the Ministry of Health of the Russian Federation, Obninsk, Russia
| | - V Yu Timoshenko
- MEPhI, Institute of Engineering Physics for Biomedicine (PhysBio), 115409, Moscow, Russia
- Lomonosov Moscow State University, Physics Department, Leninskie Gory 1, 119991, Moscow, Russia
| | - P N Prasad
- MEPhI, Institute of Engineering Physics for Biomedicine (PhysBio), 115409, Moscow, Russia.
- Department of Chemistry and Institute for Lasers, Photonics, and Biophotonics, University at Buffalo, The State University of New York, Buffalo, New York, 14260, United States.
| | - I N Zavestovskaya
- MEPhI, Institute of Engineering Physics for Biomedicine (PhysBio), 115409, Moscow, Russia
| | - A V Kabashin
- MEPhI, Institute of Engineering Physics for Biomedicine (PhysBio), 115409, Moscow, Russia.
- Aix Marseille Univ, CNRS, LP3, Campus de Luminy - Case 917, 13288, Marseille, France.
| |
Collapse
|
3
|
Abstract
![]()
When metal nanoparticles are arranged
in an ordered array, they
may scatter light to produce diffracted waves. If one of the diffracted
waves then propagates in the plane of the array, it may couple the
localized plasmon resonances associated with individual nanoparticles
together, leading to an exciting phenomenon, the drastic narrowing
of plasmon resonances, down to 1–2 nm in spectral width. This
presents a dramatic improvement compared to a typical single particle
resonance line width of >80 nm. The very high quality factors of
these
diffractively coupled plasmon resonances, often referred to as plasmonic
surface lattice resonances, and related effects have made this topic
a very active and exciting field for fundamental research, and increasingly,
these resonances have been investigated for their potential in the
development of practical devices for communications, optoelectronics,
photovoltaics, data storage, biosensing, and other applications. In
the present review article, we describe the basic physical principles
and properties of plasmonic surface lattice resonances: the width
and quality of the resonances, singularities of the light phase, electric
field enhancement, etc. We pay special attention to the conditions
of their excitation in different experimental architectures by considering
the following: in-plane and out-of-plane polarizations of the incident
light, symmetric and asymmetric optical (refractive index) environments,
the presence of substrate conductivity, and the presence of an active
or magnetic medium. Finally, we review recent progress in applications
of plasmonic surface lattice resonances in various fields.
Collapse
Affiliation(s)
- V G Kravets
- School of Physics and Astronomy , University of Manchester , Manchester , M13 9PL , U.K
| | - A V Kabashin
- Aix Marseille Univ , CNRS, LP3 , Marseille , France.,MEPhI, Institute of Engineering Physics for Biomedicine (PhysBio) , BioNanophotonic Lab. , 115409 Moscow , Russia
| | - W L Barnes
- School for Physics and Astronomy , University of Exeter , Exeter , EX4 4QL , U.K
| | - A N Grigorenko
- School of Physics and Astronomy , University of Manchester , Manchester , M13 9PL , U.K
| |
Collapse
|
4
|
Gongalsky MB, Osminkina LA, Pereira A, Manankov AA, Fedorenko AA, Vasiliev AN, Solovyev VV, Kudryavtsev AA, Sentis M, Kabashin AV, Timoshenko VY. Laser-synthesized oxide-passivated bright Si quantum dots for bioimaging. Sci Rep 2016; 6:24732. [PMID: 27102695 PMCID: PMC4840388 DOI: 10.1038/srep24732] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Accepted: 04/04/2016] [Indexed: 12/01/2022] Open
Abstract
Crystalline silicon (Si) nanoparticles present an extremely promising object for bioimaging based on photoluminescence (PL) in the visible and near-infrared spectral regions, but their efficient PL emission in aqueous suspension is typically observed after wet chemistry procedures leading to residual toxicity issues. Here, we introduce ultrapure laser-synthesized Si-based quantum dots (QDs), which are water-dispersible and exhibit bright exciton PL in the window of relative tissue transparency near 800 nm. Based on the laser ablation of crystalline Si targets in gaseous helium, followed by ultrasound-assisted dispersion of the deposited films in physiological saline, the proposed method avoids any toxic by-products during the synthesis. We demonstrate efficient contrast of the Si QDs in living cells by following the exciton PL. We also show that the prepared QDs do not provoke any cytoxicity effects while penetrating into the cells and efficiently accumulating near the cell membrane and in the cytoplasm. Combined with the possibility of enabling parallel therapeutic channels, ultrapure laser-synthesized Si nanostructures present unique object for cancer theranostic applications.
Collapse
Affiliation(s)
- M. B. Gongalsky
- Lomonosov Moscow State University, Department of Physics, 119991 Moscow, Russia
| | - L. A. Osminkina
- Lomonosov Moscow State University, Department of Physics, 119991 Moscow, Russia
- Bio-nanophotonics Laboratory, National Research Nuclear University “MEPhI” (Moscow Engineering Physics Institute), 31 Kashirskoe sh., 115409 Moscow, Russia
| | - A. Pereira
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France
| | - A. A. Manankov
- Lomonosov Moscow State University, Department of Physics, 119991 Moscow, Russia
| | - A. A. Fedorenko
- Lomonosov Moscow State University, Department of Physics, 119991 Moscow, Russia
| | - A. N. Vasiliev
- Lomonosov Moscow State University, Department of Physics, 119991 Moscow, Russia
| | - V. V. Solovyev
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, 142292, Moscow Region, Russia
| | - A. A. Kudryavtsev
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, 142292, Moscow Region, Russia
| | - M. Sentis
- Bio-nanophotonics Laboratory, National Research Nuclear University “MEPhI” (Moscow Engineering Physics Institute), 31 Kashirskoe sh., 115409 Moscow, Russia
- Aix Marseille University, CNRS, UMR 7341 CNRS, LP3, Campus de Luminy – case 917, 13288, Marseille Cedex 9, France
| | - A. V. Kabashin
- Aix Marseille University, CNRS, UMR 7341 CNRS, LP3, Campus de Luminy – case 917, 13288, Marseille Cedex 9, France
| | - V. Yu. Timoshenko
- Lomonosov Moscow State University, Department of Physics, 119991 Moscow, Russia
- Bio-nanophotonics Laboratory, National Research Nuclear University “MEPhI” (Moscow Engineering Physics Institute), 31 Kashirskoe sh., 115409 Moscow, Russia
| |
Collapse
|
5
|
Riazanova AV, Costanzi BN, Aristov AI, Rikers YGM, Mulders JJL, Kabashin AV, Dahlberg ED, Belova LM. Gas-assisted electron-beam-induced nanopatterning of high-quality titanium oxide. Nanotechnology 2016; 27:115304. [PMID: 26878568 DOI: 10.1088/0957-4484/27/11/115304] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Electron-beam-induced deposition of titanium oxide nanopatterns is described. The precursor is titanium tetra-isopropoxide, delivered to the deposition point through a needle and mixed with oxygen at the same point via a flow through a separate needle. The depositions are free of residual carbon and have an EDX determined stoichiometry of TiO2.2. High resolution transmission electron microscopy and Raman spectroscopy studies reveal an amorphous structure of the fabricated titanium oxide. Ellipsometric characterization of the deposited material reveals a refractive index of 2.2-2.4 RIU in the spectral range of 500-1700 nm and a very low extinction coefficient (lower than 10(-6) in the range of 400-1700 nm), which is consistent with high quality titanium oxide. The electrical resistivity of the titanium oxide patterned with this new process is in the range of 10-40 GΩ cm and the measured breakdown field is in the range of 10-70 V μm(-1). The fabricated nanopatterns are important for a variety of applications, including field-effect transistors, memory devices, MEMS, waveguide structures, bio- and chemical sensors.
Collapse
Affiliation(s)
- A V Riazanova
- Department of Materials Science and Engineering, Royal Institute of Technology-KTH, Brinellvägen 23, SE-100 44, Stockholm, Sweden
| | | | | | | | | | | | | | | |
Collapse
|
6
|
Riazanova AV, Costanzi BN, Aristov A, Rikers YGM, Ström V, Mulders JJL, Kabashin AV, Dahlberg ED, Belova LM. Gas-assisted electron-beam-induced nanopatterning of high-quality Si-based insulator. Nanotechnology 2014; 25:155301. [PMID: 24642787 DOI: 10.1088/0957-4484/25/15/155301] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
An oxygen-assisted electron-beam-induced deposition (EBID) process, in which an oxygen flow and the vapor phase of the precursor, tetraethyl orthosilicate (TEOS), are both mixed and delivered through a single needle, is described. The optical properties of the SiO(2+δ) (- 0.04 ≤ δ ≤ +0.28) are comparable to fused silica. The electrical resistivity of both single-needle and double-needle SiO(2+δ) are comparable (greater than 7 GΩ cm) and a measured breakdown field is greater than 400 V μm(-1). Compared to the double-needle process the advantage of the single-needle technique is the ease of alignment and the proximity to the deposition location, which facilitates fabrication of complex 3D structures for nanophotonics, photovoltaics, micro- and nano-electronics applications.
Collapse
Affiliation(s)
- A V Riazanova
- Department of Materials Science and Engineering, Royal Institute of Technology-KTH, Brinellvägen 23, SE-100 44, Stockholm, Sweden
| | | | | | | | | | | | | | | | | |
Collapse
|
7
|
Kravets VG, Schedin F, Jalil R, Britnell L, Gorbachev RV, Ansell D, Thackray B, Novoselov KS, Geim AK, Kabashin AV, Grigorenko AN. Singular phase nano-optics in plasmonic metamaterials for label-free single-molecule detection. Nat Mater 2013; 12:304-9. [PMID: 23314104 DOI: 10.1038/nmat3537] [Citation(s) in RCA: 166] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2012] [Accepted: 11/30/2012] [Indexed: 05/20/2023]
Abstract
The non-trivial behaviour of phase is crucial for many important physical phenomena, such as, for example, the Aharonov-Bohm effect and the Berry phase. By manipulating the phase of light one can create 'twisted' photons, vortex knots and dislocations which has led to the emergence of the field of singular optics relying on abrupt phase changes. Here we demonstrate the feasibility of singular visible-light nano-optics which exploits the benefits of both plasmonic field enhancement and the peculiarities of the phase of light. We show that properly designed plasmonic metamaterials exhibit topologically protected zero reflection yielding to sharp phase changes nearby, which can be employed to radically improve the sensitivity of detectors based on plasmon resonances. By using reversible hydrogenation of graphene and binding of streptavidin-biotin, we demonstrate an areal mass sensitivity at a level of fg mm(-2) and detection of individual biomolecules, respectively. Our proof-of-concept results offer a route towards simple and scalable single-molecule label-free biosensing technologies.
Collapse
Affiliation(s)
- V G Kravets
- School of Physics and Astronomy, University of Manchester, Manchester, UK
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Kravets VG, Schedin F, Kabashin AV, Grigorenko AN. Sensitivity of collective plasmon modes of gold nanoresonators to local environment. Opt Lett 2010; 35:956-958. [PMID: 20364182 DOI: 10.1364/ol.35.000956] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We present what we believe to be the first experimental study of the optical response of collective plasmon resonances in regular arrays of nanoresonators to local environment. Recently observed collective plasmon modes arise due to diffractive coupling of localized plasmons and yield almost 1 order of magnitude improvement in resonance quality. We measure the response of these modes to tiny variations of the refractive index of both gaseous and liquid media. We show that the phase sensitivity of the collective resonances can be more than 2 orders of magnitude better than the best amplitude sensitivity of the same nanodot array as well as 1 order of magnitude better than the phase sensitivity in surface plasmon resonance sensors.
Collapse
Affiliation(s)
- V G Kravets
- School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK
| | | | | | | |
Collapse
|
9
|
Kabashin AV, Evans P, Pastkovsky S, Hendren W, Wurtz GA, Atkinson R, Pollard R, Podolskiy VA, Zayats AV. Plasmonic nanorod metamaterials for biosensing. Nat Mater 2009; 8:867-71. [PMID: 19820701 DOI: 10.1038/nmat2546] [Citation(s) in RCA: 649] [Impact Index Per Article: 43.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2008] [Accepted: 09/14/2009] [Indexed: 05/20/2023]
Abstract
Label-free plasmonic biosensors rely either on surface plasmon polaritons or on localized surface plasmons on continuous or nanostructured noble-metal surfaces to detect molecular-binding events. Despite undisputed advantages, including spectral tunability, strong enhancement of the local electric field and much better adaptability to modern nanobiotechnology architectures, localized plasmons demonstrate orders of magnitude lower sensitivity compared with their guided counterparts. Here, we demonstrate an improvement in biosensing technology using a plasmonic metamaterial that is capable of supporting a guided mode in a porous nanorod layer. Benefiting from a substantial overlap between the probing field and the active biological substance incorporated between the nanorods and a strong plasmon-mediated energy confinement inside the layer, this metamaterial provides an enhanced sensitivity to refractive-index variations of the medium between the rods (more than 30,000 nm per refractive-index unit). We demonstrate the feasibility of our approach using a standard streptavidin-biotin affinity model and record considerable improvement in the detection limit of small analytes compared with conventional label-free plasmonic devices.
Collapse
Affiliation(s)
- A V Kabashin
- Laboratoire Lasers, Plasmas et Procédés Photoniques (LP3 UMR 6182 CNRS), Faculté des Sciences de Luminy, Université de Méditerranée, 163 Avenue de Luminy, 13288 Marseille Cedex 09, France
| | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Patskovsky S, Vallieres M, Maisonneuve M, Song IH, Meunier M, Kabashin AV. Designing efficient zero calibration point for phase-sensitive surface plasmon resonance biosensing. Opt Express 2009; 17:2255-2263. [PMID: 19219129 DOI: 10.1364/oe.17.002255] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
This work is related to the development of phase-sensitive methodologies in Surface Plasmon Resonance (SPR) biosensing. We take advantage of a specific angular dependence of phase of light, reflected under SPR geometry, on parameters of the SPR-supporting metal, and propose a polarimetry-based methodology to easily determine the optimal calibration zero point, corresponding to the maximal phase sensitivity. The proposed methodology can significantly facilitate the calibration of the system in field and multi-channel sensing, broaden the dynamic range, as well as contribute to the development of feedback loops.
Collapse
Affiliation(s)
- S Patskovsky
- Engineering Physics Department, Ecole Polytechnique de Montréal, C. P. 6079, succ. Centre-Ville, Montréal (Québec), Canada, H3C 3A7
| | | | | | | | | | | |
Collapse
|
11
|
Patskovsky S, Maisonneuve M, Meunier M, Kabashin AV. Mechanical modulation method for ultrasensitive phase measurements in photonics biosensing. Opt Express 2008; 16:21305-21314. [PMID: 19104560 DOI: 10.1364/oe.16.021305] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A novel polarimetry methodology for phase-sensitive measurements in single reflection geometry is proposed for applications in optical transduction-based biological sensing. The methodology uses altering step-like chopper-based mechanical phase modulation for orthogonal s- and p- polarizations of light reflected from the sensing interface and the extraction of phase information at different harmonics of the modulation. We show that even under a relatively simple experimental arrangement, the methodology provides the resolution of phase measurements as low as 0.007 deg. We also examine the proposed approach using Total Internal Reflection (TIR) and Surface Plasmon Resonance (SPR) geometries. For TIR geometry, the response appears to be strongly dependent on the prism material with the best values for high refractive index Si. The detection limit for Si-based TIR is estimated as 10(-5) in terms Refractive Index Units (RIU) change. SPR geometry offers much stronger phase response due to a much sharper phase characteristics. With the detection limit of 3.2*10(-7) RIU, the proposed methodology provides one of best sensitivities for phase-sensitive SPR devices. Advantages of the proposed method include high sensitivity, simplicity of experimental setup and noise immunity as a result of a high stability modulation.
Collapse
Affiliation(s)
- S Patskovsky
- Engineering Physics Department, Ecole Polytechnique de Montréal, C. P. 6079, succ. Centre-Ville, Montréal, Québec, Canada, H3C 3A7
| | | | | | | |
Collapse
|
12
|
Abstract
A concept of phase-sensitive Si-based Total Internal Reflection bio- and chemical sensor is presented. The sensor uses the reflection of light from an internal edge of a Si prism, which is in contact with analyte material changing its index of refraction (thickness). Changes of the refractive index are monitored by measuring the differential phase shift between p- and s-polarized components of light reflected from the system. We show that due to a high refractive index of Si, such methodology leads to a high sensitivity and dynamic range of measurements. Furthermore, the Si-based platform offers an easy bioimmobilization step and excellent opportunities for the development of multi-channel microsensors taking advantage of the advanced state of development of Si-based microfabrication technologies.
Collapse
|
13
|
Kabashin AV, Meunier M. Femtosecond laser ablation in aqueous solutions: a novel method to synthesize non-toxic metal colloids with controllable size. ACTA ACUST UNITED AC 2007. [DOI: 10.1088/1742-6596/59/1/074] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
14
|
Abstract
A technique of phase-polarisation contrast (PPC) for the enhancement of the contrast of a surface plasmon resonance (SPR) intensity profile is proposed and experimentally realised. The technique exploits the peculiarities of light phase and polarisation behaviour under SPR. It applies to non-optimum SPR coupling conditions and enables one to lower the resonant minimum of reflected intensity nearly to zero, and hence to increase substantially the ratio of the intensity from the resonance to that at the minimum. We observed the contrast enhancement by more than one order of magnitude when we applied the PPC scheme. The PPC can be efficiently employed in commercial SPR sensors, as it significantly reduces restrictions on allowable parameters of SPR-supporting metal films and biomolecular layers immobilised on them, facilitates SPR observation, and increases the accuracy of SPR shift measurements.
Collapse
Affiliation(s)
- A V Kabashin
- General Physics Institute, Russian Academy of Sciences, Moscow, Russia.
| | | | | | | |
Collapse
|