Laser selective spectromicroscopy of myriad single molecules: tool for far-field multicolour materials nanodiagnostics

Naumov, Andrei V.; Eremchev, Ivan Yu.; Gorshelev, A. A.

doi:10.1140/epjd/e2014-50414-x

Cited by 53 publications

(39 citation statements)

References 137 publications

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“…In particular, one of the problems is increasing the efficiency of mutually reversible conversion of the light wave field and plasmon polaritons formed in layered structures [67]. Final answers to these problems can be obtained in relevant experiments, in particular, using epiluminescence spectromicroscopy of single quantum emitters [68][69][70].…”

Section: Discussionmentioning

confidence: 99%

Formation of plasmon pulses in the cooperative decay of excitons of quantum dots near a metal surface

Shesterikov

Gubin

Gladush

et al. 2017

J. Exp. Theor. Phys.

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The formation of pulses of surface electromagnetic waves in a metal/dielectric interface is considered in the process of cooperative decay of excitons of quantum dots distributed near a metal surface in a dielectric layer. It is shown that the efficiency of exciton energy transfer to excited plasmons can be increased by selecting the dielectric material with specified values of the complex permittivity. It is found that in the mean field approximation the semiclassical model of formation of plasmon pulses in the system under study is reduced to the pendulum equation with the additional term of nonlinear losses.

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Section: Discussionmentioning

confidence: 99%

Formation of plasmon pulses in the cooperative decay of excitons of quantum dots near a metal surface

Shesterikov

Gubin

Gladush

et al. 2017

J. Exp. Theor. Phys.

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“…After that it was placed on a precise 2D scanning stage of the fluorescence microscope-spectrometer [3]. The XY travel range was 25 μm 2 with a step of 0.5 μm approximately.…”

Section: Introductionmentioning

confidence: 99%

Luminescent microscopy of the small ensembles of the CdSe nanocrystalls synthesized in the liquid crystal matrix of the cadmium octanoate

2016

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Abstract.Here we present investigation of the thin film with CdSe nanocrystals with the size 2.3 nm made from low-concentration toluene solution. Using fluorescent microscopy method we have found small nanocrystals ensembles up to single nanocrystals. Luminescence spectra in different parts of the test sample were registered. Analysing them we can draw a conclusion about the inhomogeneous nature of the luminescence spectra of the bulk nanocomposite material.Combination of the unique properties of the new functional nanostructures and the unique features of the liquid crystal (LC) materials expands possibilities for their potential use significantly. Today, there are three main approaches for obtaining composites based on LC materials with nanostructures. They are doping LC matrix with nanoparticles, spraying nanostructures on the LC substrate surface and in-situ method of the direct synthesis inside the LC material [1]. To investigate spectral characteristics of the 3rd type structures we were provided with the CdSe quantum dots (QDs) grown directly in the ionic thermotropic LC matrix [2].Polycrystalline powder with CdSe QDs was dispersed in chemically pure toluene and deposited on a substrate. After that it was placed on a precise 2D scanning stage of the fluorescence microscope-spectrometer [3]. The XY travel range was 25 μm 2 with a step of 0.5 μm approximately. Luminescence spectrum was recorded on every step. All luminescence spectra were obtained at room temperature using DPSS laser diode pumping at wavelength of 405 nm.Inside the red frame on the Fig. 1 there are several examples of the recorded spectra of the different diffraction-limited areas on the investigated region. As one can see these curves fall in the spectral region of a broad luminescence band (purple curve), which was previously associated with the decay of excitons localized on the intrinsic defects on the QD interface [4]. The peak at wavelength of 518 nm is the most frequently detected. It corresponds to the interband transition characteristic for nanocrystals with a size of 2.3 nm. The broad band in the region 575 -750 nm is inhomogeneously broadened because it contains many wide and narrow individual lines. Some of these lines show the effect of blinking [5][6][7][8][9]. This blinking, as well as small FWHM (10 nm at the average) of these lines

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“…One of the bright examples of such problems is the use of two-lobe light fields (i.e. the field with two sharp intensity peaks) [1] for improvement of the longitudinal resolution of fluorescent optical microscopes. The ability of the intensity rotation during propagation is characteristic for spiral light beams [2].…”

mentioning

confidence: 99%

Generation of the rotating light fields under amplitude and phase distortions

et al. 2017

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Abstract. The work contains study of the influence of amplitude and phase distortions on the generation of two-lobe light fields with the intensity distribution rotating under propagation. Spiral beams, as well as light fields formed on their basis, are considered as particular examples of two-lobe light fields. The amplitude distortions result from the preset different intensity distributions of the illuminating beam, and phase distortions are determined by the primary aberrations.The light fields with a rotating intensity distribution under propagation are the matter of interest in solving various applied problem. One of the bright examples of such problems is the use of two-lobe light fields (i.e. the field with two sharp intensity peaks) [1] for improvement of the longitudinal resolution of fluorescent optical microscopes. The ability of the intensity rotation during propagation is characteristic for spiral light beams [2]. To create these beams you need to set amplitude and phase of the light field that can be implemented by using of the holographic method [3]. However, the latter can not be always used due to the optical system characteristics and low energy efficiency. Therefore a compromise is often made in practice and light fields preserving the spatial structure of their intensity distribution within a limited area, are used instead of the spiral beams. These fields are formed by means of the phase diffractive masks. To calculate the mask phase profile, in our study we used the phase distributions of spiral beams as initial approximation.Mostly in real optical systems both amplitude and phase distortions occur. For example, in problems of three-dimensional high resolution of the fluorescent microscopy, the intensity distribution of the beam illuminating the phase mask depends on the used micro objective and the ratio of the apertures of the mask and illuminating beam. The phase distortions can be caused by aberrations of the optical system, geometric parameters of the observing system and heterogeneity of the optical parameters of the medium where a light wave propagates. Usually the influence of phase distortions prevails over that of amplitude distortions.In this paper we continue the research initiated by us earlier in our work [4]. For generation of the light fields, the phase masks based on the spiral beams were used, representing a superposition of Laguerre-Gauss modes. Primary aberrations in the representation of the Zernike polynomials are considered as the phase distortions. Numerical simulation and experiments were performed. A liquid crystal spatial light modulator was used

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Laser selective spectromicroscopy of myriad single molecules: tool for far-field multicolour materials nanodiagnostics

Cited by 53 publications

References 137 publications

Formation of plasmon pulses in the cooperative decay of excitons of quantum dots near a metal surface

Formation of plasmon pulses in the cooperative decay of excitons of quantum dots near a metal surface

Luminescent microscopy of the small ensembles of the CdSe nanocrystalls synthesized in the liquid crystal matrix of the cadmium octanoate

Generation of the rotating light fields under amplitude and phase distortions

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