Seminars of the cluster of international laboratories of Nano-Bioengineering and Hybrid Photonic Nanomaterials: Resonance light–matter interaction, fluorescence of exciton–plasmon hybrid structures, and their applications to sensing

February 20 and 22, the laboratories of Nano-Bioengineering (LNBE) and Hybrid Photonic Nanomaterials (LPNM) NRNU MEPhI held seminars where the laboratory staff presented their studies along the current lines of research in the cluster.

Resonance light–matter interaction was the subject of the first seminar. Resonance interaction between localized electromagnetic field and elementary excitations of matter is one of the main fields of joint studies of the two laboratories. This interaction may occur in the strong or weak coupling regime, depending on the ratio between the probability of coherent energy exchange in a coupled system and the inverse lifetimes of the excited state in the matter and the photon in the cavity.

Dmitriy Dovzhenko, Ph.D., presented a report on Strong Light–Matter Coupling dealing with the physical principles of resonance light–matter interaction in the case where two new hybrid states arise, the upper and lower polaritons. Dmitriy reviewed the available experimental data on strong coupling, including the results obtained in LNBE and LPNM with the use of a microcavity developed earlier in these laboratories. The microcavity can be tuned to obtain resonance between the electromagnetic mode excitation and the electron or oscillatory transition of the sample molecules. Further studies in this field will be aimed at selecting the parameters of the cavity's electromagnetic modes to enhance the light–matter coupling. The results will be used to develop practical applications of this phenomenon, in particular, control of chemical reaction rates, modification of conductivity of materials, sensing, and designing novel spontaneous coherent radiation sources.

Maxim Lednev, graduate student, reported on Simulation of the Optical Properties of Microcavities. He considered the issues of mathematical simulation of the spectral properties of photonic crystals and distribution of localized electromagnetic field modes of the tunable microcavity. Maxim told about analytical calculation methods and the methods of numerical simulation, compared their results with experimental data, and discussed the possible practical application of the mathematical models for calculating the parameters of the microcavity for strong coupling tasks.

Irina Kryukova, postgraduate student, made a statement on her research in the framework of the new project on Control of the Spectral, Spatial, and Temporal Characteristics of Emission of Hybrid Systems Based on Semiconductor Quantum Dots Fluorescing in the IR Region of the Optical Spectrum and Incorporated in One-Dimensional Porous Silicon Photonic Crystals (2019–2021) supported by the Russian Foundation for Basic Research (RFBR). The objectives of the project for this year include the fabrication of one-dimensional porous silicon photonic crystals, their comprehensive characterization, and the synthesis of quantum dots with PbS cores luminescing in the near IR region with a quantum yield higher than 50%. The factual data on the specific resistance and porosity of porous silicon samples were discussed.

Viktor Krivenkov, Ph.D., and Daria Dyagileva, graduate student, presented a report on Two-Photon Emission and Absorption Processes in Plasmon–Exciton Nanomaterials. The LNBE staff have already performed much research in two-photon luminescence of quantum dots resulting from simultaneous generation of two excitons upon the absorption of a high-energy photon (or two photons at a time). It has been found that the quantum yield of two-photon emission can be increased through interaction of quantum dots with closely located plasmonic (gold or silver) particles. Current research is aimed at designing the thin-layer plasmon–exciton hybrid structures in which the effect of enhanced two-photon luminescence is as strong as possible. Examples of the potential practical applications of these plasmon–exciton materials, mainly in sensing, were considered.

Professor Igor Nabiev, Ph.D., D.Sc., leading researcher of LNBE, gave a review report entitled Exciton–Plasmon Sensing in a Nutshell. Studies along this line began with a study by Prof. Nabiev and coworkers published as early as several years before the foundation of LNBE (Wargnier, R., Baranov, A., Maslov, V., Stsiapura, V., Artemyev, M., Pluot, M., Sukhanova, A., Nabiev, I. Energy transfer in aqueous solutions of oppositely charged CdSe/ZnS core/shell quantum dots and in quantum dot-nanogold assemblies. Nano Letters, 2004, 4, 451–457), which has got almost three hundred citations by now. The idea to use exciton–plasmon hybrid systems for sensing is based on the strong dependence of the fluorescence of this hybrid system on the distance between the exciton and plasmon particles (e.g., a quantum dot and a gold nanoparticle), as well as the mutual orientation of their dipole moments. Both parameters may vary, e.g., in a system where the exciton and plasmon components are tethered via a linker whose length and/or configuration are changed upon interaction with the substance to be detected, e.g., the interaction between an antibody built into the linker and the corresponding antigen. In this case, not only the fluorescence intensity, but also its wavelength may be changed, which is especially valuable for sensing. Recent developments have extended the potential of sensing by using multiplexed detection in systems containing quantum dots with different emission spectra.

Alyona Kosmyntseva, postgraduate student, reported on Study of Förster Resonance Energy Transfer between Quantum Dots and Fluorescently Labeled Oligonucleotides. Alyona told about the research in the mechanisms of interaction between biological polymers and nanoparticles. The results have shown that quantum dots do interact with oligonucleotides, and the interaction can be monitored by tracing the efficiency of energy transfer, its characteristics depending on both the lengths and the nucleotide sequences of the oligonucleotides.

Contacts:

Maria G. Korenkova, director of external relations (MGKorenkova@mephi.ru)
Laboratory of Nano-Bioengineering, Moscow Engineering Physics Institute
31 Kashirskoe shosse, 115409 Moscow, Russian Federation
http://www.lnbe.mephi.ru/en

Alexandra V. Razgulina, research engineer (alexandrav.korenkova@gmail.com)
Laboratory of Hybrid Photonic Nanomaterials, Moscow Engineering Physics Institute
31 Kashirskoe shosse, 115409 Moscow, Russian Federation
http://lpnm.mephi.ru/index.php/ru/

 
 
 
© 2012 Laboratory of Nano-BioEngineering