Metastructural systems of activated nanospheres and optical near-field resonances

Gadomsky, O. N.; Kadochkin, A. S.

doi:10.1134/1.1870070

Opt. Spectrosc.

2005

DOI: 10.1134/1.1870070

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Metastructural systems of activated nanospheres and optical near-field resonances

O. N. Gadomsky

A. S. Kadochkin

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Cited by 4 publications

(14 citation statements)

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“…Taking into account the interaction of the nanospheres and also their angular distribution leads to the appearance of a dependence of the spectrum on the location of the structural elements. As shown in [16,17], a change in the distance between the centers of the interacting spheres in a two-particle system leads to a shift of the size-dependent optical resonance along the frequency scale. As can be also seen in Fig.…”

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confidence: 97%

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Light scattering by nanosized systems with different spatial organizations

Shalin

2006

J Appl Spectrosc

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The integrodifferential equation method is used to study the spectrum of a nanoparticle colloid for the example of interaction of three arbitrarily arranged dielectric particles made up of nonresonant atoms (the eigenfrequency of the transition is far from the emission frequency) with incorporated barium atoms in an external optical radiation field. The effect on the light-scattering properties of a nanosphere in the ensemble of its distant "neighbors" is studied; an additional peak associated with them is observed as a frequency close to the resonance for an isolated nanosphere, which under certain conditions has higher intensity than the main peak corresponding to optical near-field resonance in a two-particle system. The dependence of the spectrum of the nanosized system on the geometric structure is studied, and it is shown that very precise tuning of the resonance frequency is possible by varying the angular distribution of the particles.Introduction. In many optical problems connected with emission by microsized and nanosized structures, the problem arises of studying their scattering spectrum, and also identifying the resonance frequencies corresponding to the considered system. In [1], such a problem was solved for the case of metastructural coatings composed of dimers of alkali metals. In [2, 3], clusters were studied that included several tens of interacting atoms. Considerable attention has also been paid to application of such structures in medicine [4-7] (DNA-bound nanoparticles, biomarkers). For this purpose, mainly spherical nanoparticles on the order of 10-30 nm in size have been used, the optical properties of which [8,9] are determined by resonance at the wavelength ≈550 nm. Papers are available that study the light-scattering characteristics of particles of arbitrary shape [10].A large number of papers have also been devoted to study of the interaction between nanoparticles in systems of two or more components. Thus the papers [11,12] study the interaction of a metallic nanosphere with the smooth surface of a semi-infinite medium, which is of significant interest, for example, for optical near-field microscopy. The papers [13,14] study the interaction of a spherical nanoparticle with the surface of an optical medium when island films are present on the surface. This has made it possible to satisfactorily explain the spectral properties of objects observed in [15].We should note that in practically all the indicated papers, the studied structures were considered in the nearest "neighbor" approximation, i.e., neglecting the effect of more distant particles (considering that effect as negligibly small compared with the effect of the surrounding environment). Nevertheless, under certain conditions, we cannot neglect the distant "neighbors", and taking them into account leads to the appearance of additional peaks in the spectrum of the interacting nanoparticles.In this paper, a successive solution of the boundary-value problem of optics for light scattering from some colloid is proposed, taking into...

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“…plicated form [13,[16][17][18]. In the case under consideration, for some colloid made up of dielectric (glass) nanoparticles activated by impurity atoms, we can write the simplified expression [16,17]:…”

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confidence: 99%

Light scattering by nanosized systems with different spatial organizations

Shalin

2006

J Appl Spectrosc

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“…The application of this method to the solution of various optics problems has been reviewed in detail [9]. The solution to the problem of the interaction of two spherical dielectric nanoparticles activated by dopant atoms has been reported [10]. In this method, the electric field strength E(r, t) at an arbitrary observation point r at time t for the examined system is written as…”

mentioning

confidence: 99%

“…where E 0I is the amplitude of the incident planar wave with wave vector k 0 and geometric factors , Tj and , Rj were calculated earlier [10].…”

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confidence: 99%

“…(10) that are proportional to a T correspond to the interaction of atoms within one nanosphere; those proportional to a R1 m , the interaction of atoms belonging to different nanospheres. Equation (10) has been studied in detail [10]. Let us use the developed theory to investigate the optical properties of the system proposed by us as an optical near-field microscope.…”

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Method of resonance near-field optical microscopy

Kadochkin

2007

J Appl Spectrosc

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A. S. KadochkinUDC 535.32We have solved the problem in which a thin metal wafer (probe) with a nanohole interacts with the flat surface of a metastructured film consisting of metal nanoparticles in an external optical radiation field. Nanoparticles are considered as two-level atomic systems. This interaction of the wafer-probe and the flat surface in the external optical radiation field gives rise to optical near-field resonance, the frequency of which differs significantly from the natural frequencies of two-level atoms in the medium and the probe. The fields inside and outside the probe and metastructured film are calculated in the near-field and far-field zones. The maximum resolution, which is achievable in the suggested scheme of near-field optical microscopy, can reach about 10 nm.Introduction. Scanning optical near-field microscopy (ONFM) methods are usually divided into two types, aperture and apertureless. It is thought that aperture methods, in which the probe is a sharpened waveguide covered on the end with a metal film with a nanohole, are not useful for obtaining an ultrahigh-resolution optical image. This is due to the fact that diffraction prevents the production of a point spot from the probe, as a result of which an elongated point object is portrayed. Furthermore, it has been shown [1] that the transmission capacity of a small aperture decreases sharply and is described by the law a/λ 4 if the wavelength λ is much greater than the aperture radius. Thus, the output power in the visible range is limited to several nanowatts. However, apertureless methods also have drawbacks, mainly, the influence of the probe on the field in the investigated object, which in many instances makes it difficult to interpret the resulting images.Recently reports have appeared [2][3][4] in which new aperture ONFM methods are suggested in order to overcome these drawbacks. Thus, an aluminum wafer probe with a trigonal aperture ≈50 nm in diameter was examined for studying fluorescing molecules on the surface of a polymeric film [4]. A resolution of ≈30 nm was achieved. However, the employed method [4] was suitable only for studying separated fluorescing molecules, distances between which were much greater than the size of the aperture-probe. It seems possible to avoid these drawbacks of aperture methods by using near-field resonance interaction of the probe and the investigated nano-sized object so that the resolving power, as shown below, can be less than the size of the aperture.The theory of near-field resonances arising through interaction of two particles located in an external radiation field has been examined [5]. It was shown that a system of two interacting nanoparticles located in an optical radiation field can produce optical near-field resonance, the properties of which depend on whether the nanoparticles are the same or different and on the polarization of the external radiation relative to the axis of the nanostructured object. The frequencies of the resulting resonances depend strongly on the distance betw...

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Electrodynamic response of a colloid ensemble with allowance for the influence of distant nanoparticles

Shalin

2006

Russ Phys J

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A. S. ShalinUDC 537.876The optical properties of a colloid consisting of nanoparticles are investigated on the example of interaction of three dielectric particles consisting of nonresonant atoms (whose natural transition frequencies are far from the radiation frequency) with interstitial barium atoms in the field of external optical radiation. On the basis of integrodifferential equations, expressions for the electric and magnetic fields in the wave zone are derived. The influence of distant neighbors in the ensemble on the light-scattering properties of a nanoparticle is considered, and the condition of applicability of the frequently used two-particle approximation is obtained. The spectrum of the system is investigated, and an additional resonant peak at the natural frequency of the isolated particle caused by the distant neighbor is established. Under some specific conditions, the additional peak intensity may exceed the main peak intensity of the optical near-field resonance in the two-particle system.

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Metastructural systems of activated nanospheres and optical near-field resonances

Cited by 4 publications

References 6 publications

Light scattering by nanosized systems with different spatial organizations

Light scattering by nanosized systems with different spatial organizations

Method of resonance near-field optical microscopy

Electrodynamic response of a colloid ensemble with allowance for the influence of distant nanoparticles

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