Stimulated scattering caused by the interaction of light with morphology-dependent acoustic resonance

Tcherniega, N. V.; Samoylovich, M. I.; Kudryavtseva, A. D.; Belyanin, А. F.; Pashchenko, P. V.; Dzbanovski, N. N.

doi:10.1364/ol.35.000300

Cited by 32 publications

(15 citation statements)

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“…In the spectrum of the light reflected from the sample, we observed an additional spectral component shifted from the laser line by the value of several tenths of cm −1 if the threshold is reached [16]. For transparent films, SLFRS was observed also in the forward direction.…”

Section: Slfrs In Nanostructured Thin Filmsmentioning

confidence: 73%

Photon–Phonon Interactions in Nanostructured Systems

et al. 2012

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A new type of stimulated scattering (SLFRS)-stimulated low-frequency Raman scattering-has been observed in different nanostructured materials: synthetic opal matrices, nanostructured thin films, and suspensions of nanodiamonds. SLFRS has been shown to be a result of laser pulse interactions with acoustic vibrations of nanostructured material elements. Experimentally the effect shows itself in the appearance of one or a few spectral lines in the Stokes range in both the forward and backward directions with a frequency shift from the exciting light of the order of a few tens of cm −1 , which corresponds to the vibrations located in the GHz range. Measured values of frequency shifts correspond well to the eigenvalues of the vibration frequencies of the nanostructure elements.

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Section: Slfrs In Nanostructured Thin Filmsmentioning

confidence: 73%

Photon–Phonon Interactions in Nanostructured Systems

et al. 2012

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“…Opal matrix with a volume of 2-3 cm 3 and dimensions of single-domain regions ≥0.1 mm 3 were used to form nanocomposites. Experimental investigations were carried out with samples of opal matrices with the diameter of SiO 2 nanospheres of about 260 nm.…”

Section: Production Of Nanocomposites: Opal Matrix -Titanium Oxidementioning

confidence: 99%

“…Метаматериалы и наноком-позиты на их основе перспективны в электрон-ной технике при создании твердотельных СВЧ-устройств (фильтров, линий задержки, фазовра-щающих элементов и др. ), а так же источников направленного рентгеновского излучения и аку-стических волн [2,3]. Прогнозируется появление на основе опаловых матриц приборов управле-ния фазовыми скоростями в оптическом, СВЧ-и ТГц-диапазонах [4,5].…”

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“…Metamaterials and nanocomposites based on them are promising for use in electronic engineering for creation of solid-state microwave devices (filters, delay lines, phase changers, etc.) and the sources of the x-ray radiation and acoustic waves [2,3]. It is predicted that on the basis of opal matrixes the devices for phase velocity control in optical, microwave and THzranges will be developed [4,5].…”

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confidence: 99%

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Structure and physical properties of nanocomposites: opal matrix – titanium oxide

Samoĭlovich¹,

Belyanin²,

Odinokov³

et al. 2016

NanoRus

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Рассмотрены условия формирования нанокомпозитов на основе решетчатых упаковок наносфер SiO 2 (опаловых матриц), содержащих в межсферических полостях кристаллиты оксидов титана (TiO 2 и TiO). Изучены состав и строение нанокомпозитов с использованием электронной микроскопии, рентгеновской дифрактометрии и спектроскопии комбинационного рассеяния света. Приведены результаты измерений частотных зависимостей действительной и мнимой компонент диэлектрической проницаемости, а также микроволновой проводимости (в диапазоне 10 -2 -10 12 Гц) полученных наноструктур. The conditions for the formation of nanocomposites based on lattice packings SiO 2 nanospheres (opal matrices) with crystallites of titanium oxide (TiO 2 and TiO) in interspherical nanospacing are considered. The composition and structure of the nanocomposites were studied by electron microscopy, X-ray diffraction and Raman spectroscopy. Results of measuring of the frequency dependences of real and imaginary components of the permittivity and microwave conductivity (ranging 10 -2 -10 12 Hz) of obtained nanostructures are viewed.

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“…Recently in Central Scientific Technology Institute "Technomash" a method has been developed (and patented) for generating pulsed X-ray radiation with a small angular divergence, which is based on a pulsed ruby laser with power density 0.25-2.0 GW/cm 2 interaction with opal matrix -an ordered structure of X-ray amorphous silica (SiO 2 ) nanospheres with diameters in the range of 200-350 nm [1][2][3][4]. Variations in the diameter of a single sample were not more than ± 3%).…”

mentioning

confidence: 99%

Method of generating a pulsed X-ray

Samoylovich

Tcherniega

Kudryavtseva

et al. 2013

2013 International Conference on Advanced Optoelectronics and Lasers (CAOL 2013)

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Nonlinear optical effects in lattice SiO 2 nanosphere packings under pulse laser excitation are experimentally studied. Pulse generation of narrow-beam X-ray radiation is determined in this samples. The possibility of using this effect in medicine are considered.The studies relates to the field of Radiological, and can be used in medicine, medical imaging, inspection of materials, Xray microscopy. In the medical literature described and widely discussed such issues with endoscopic studies related to earlystage cancer (or other) diseases, by using different types of external exposure to radiation, including laser. It is known that the most effective method of radiation exposure (at minimum injury to healthy cells) is the x-rays aimed directly (locally) to the affected area with not very high energies (and therefore, with comparatively small depth of penetration) and precisely controlled local dose.Until now, such methods had not been developed because of the lack of miniature x-ray sources. Listed in our articles data used to generate a focused pulsed X-rays (photons with energies of the order of 80-100 keV) metamaterials based on opal matrices show the reality of the creation of endoscopic devices using fiber-optic cables to the size input devices themselves to generate not more than 1-1.5 mm both in length and in diameter.Recently in Central Scientific Technology Institute "Technomash" a method has been developed (and patented) for generating pulsed X-ray radiation with a small angular divergence, which is based on a pulsed ruby laser with power density 0.25-2.0 GW/cm 2 interaction with opal matrix -an ordered structure of X-ray amorphous silica (SiO 2 ) nanospheres with diameters in the range of 200-350 nm [1][2][3][4]. Variations in the diameter of a single sample were not more than ± 3%). Voids between spheres were filled with the material with dielectric constant value (ε) more than 2.5. Filling factor was in the range of 30-85%. Due to the opal matrix structure as a densely packed lattice of SiO 2 nanospheres (Fig. 1), the samples are both photonic structures with a system of photonic band gaps. If the voids between spheres are filled with dielectric materials with large ε' or electrically (magnetically) active materials, such substances may be considered as metamaterials.Ruby laser pulse (λ=694.3 nm, τ=20 ns, E max =0.3 J) has been used as a source of excitation. Exciting light has been focused into the material by lenses with different focal lengths (50, 90, and 150 mm). The sample distance from focusing system and exciting light energy were also changed. It allowed us to vary the power density at the entrance of the sample and field distribution in microvoids inside the sample (Fig. 2). a) b) Fig. 1. a) Structure (SEM) of the volume opal matrix sample surface (ordered package of SiO 2 nanospheres). b) Tetrahedral and octahedral nanovoids (in accordance with a number of spheres, forming void), produced by SiO 2 nanospheres.

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Stimulated scattering caused by the interaction of light with morphology-dependent acoustic resonance

Cited by 32 publications

References 5 publications

Photon–Phonon Interactions in Nanostructured Systems

Photon–Phonon Interactions in Nanostructured Systems

Structure and physical properties of nanocomposites: opal matrix – titanium oxide

Method of generating a pulsed X-ray

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