Optics of microdroplets

Datsyuk, V. V.; Izmaǐlov, I. A.

doi:10.3367/ufnr.0171.200110m.1117

Cited by 25 publications

(18 citation statements)

References 192 publications

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“…Their specifics are that spherical particles have focusing properties and form high-Q microresonators in which morphological resonances or modes of whispering gallery are realized [5]. This results in a sharp increase in the intensity of acting optical fields in the particle volume and, as a consequence, in reduced power thresholds of nonlinear optical processes proceeding in particles.…”

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confidence: 98%

Fluorescence of a Liquid Drop with a Dye Excited by Femtosecond Laser Pulses

et al. 2005

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Results of investigations into the spectral and power characteristics of two-photon fluorescence of a liquid drop with the Rhodamine 6G dye irradiated by femtosecond laser pulses are presented. It is demonstrated that stimulated emission of two types is realized in drops with the concentrated dye solution, namely, superfluorescence within the drop volume and lasing on whispering gallery modes.Creation of laser systems capable of generating femtosecond light pulses with high intensity sufficient for realization of multiphoton effects in the process of radiation interaction with substance in the middle 80s stimulated the formation of a number of new directions of modern physics and technology. Among these are new methods of laser control over physical and chemical processes based on the selective multiphoton absorption of femtosecond radiation by substance molecules, including finely dispersed substance (femtochemistry) [1, 2]. Creation of highly informative optical communication channels in the atmosphere also posed the problem of studying the multiphoton interaction of femtosecond radiation with substance, in particular, with disperse media incorporating the atmospheric aerosol. Upgrading systems of optical information transfer and processing aimed at increasing their operation speed and compactness of optical elements makes urgent a study of femtosecond radiation interaction with such objects as microfibers and dielectric microresonators that can serve as miniature emitters or frequency converters [3,4].It should be emphasized that the above-mentioned objects -disperse media -exposed to femtosecond radiation are specific physical systems. Their specifics are that spherical particles have focusing properties and form high-Q microresonators in which morphological resonances or modes of whispering gallery are realized [5]. This results in a sharp increase in the intensity of acting optical fields in the particle volume and, as a consequence, in reduced power thresholds of nonlinear optical processes proceeding in particles. In spite of the fact that optical processes in spherical particles and drops have been investigated already during a quarter of the century, only few works study the interaction of multiphoton femtosecond radiation with the aerosol and liquid-drop substance.The present paper is aimed at studying fluorescence of drops with an organic dye excited due to the multiphoton absorption of femtosecond laser pulses.A titanium-sapphire laser generating pulses at the wavelength λ = 0.8 µm with duration t p = 80 fs and 9 ns and energy per pulse <17 mJ served as a source of femtosecond radiation [6]. The width of the radiation spectrum for nano-and femtosecond pulses at half-maximum was ~25 nm. The intensity distribution over the beam cross-section was close to Gaussian. The femtosecond pulse energy was controlled by registration of radiation in the reference channel with the help of a calibrated photodiode.Unfocused femtosecond radiation was directed onto a drop with the Rhodamin 6G dye in ethanol. The drop ...

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confidence: 98%

Fluorescence of a Liquid Drop with a Dye Excited by Femtosecond Laser Pulses

et al. 2005

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“…(2) can be found both numerically and analytically. 6,7,30 The second lasing threshold condition can be written as follows:…”

Section: B Quality Factor Of a Whispering-gallery Modementioning

confidence: 99%

“…1 Recent years have shown an increased interest in spherical microlasers. [1][2][3][4][5][6][7][8] Their modes, called whispering-gallery modes (WGMs), are commonly imagined as closed-trajectory rays confined within the cavity by almost total internal reflection from the spherical surface. Because of these modes, morphology-dependent resonances (MDRs) appear in the spectra of elastic light scattering, fluorescence, Raman scattering, and lasing.…”

Section: Introductionmentioning

confidence: 99%

Properties of a laser based on evanescent-wave amplification

2005

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The criteria for lasing in a dielectric sphere surrounded by an active medium are given. They are presented in simple analytical form and confirmed by numeric calculations of the amplitudes of the morphology-dependent resonances in spontaneous emission spectra. The determined lasing threshold of this novel-type laser is compared with that of a conventional spherical laser with an optically active internal layer. The diverse advantages of a laser based on the gain of the evanescent part of a whispering-gallery mode are discussed.

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“…These surface modes are commonly imagined as closed-trajectory rays confined within the cavity by almost total internal reflections from the surface. Excitation of WGMs causes appearance of the morphology-dependent resonances (MDRs) in spectra of spontaneous emission and lasing, elastic and inelastic light scattering (including fluorescence and Raman scattering) [7,8]. Thus, the molecular emission spectra, smooth in a bulk volume, exhibit ripple structure when light is radiated from a spherical particle (see Fig.…”

Section: Spectral Indications Of the Whispering Gallery Modesmentioning

confidence: 99%

Properties of optical microsensor based on observation of whispering-gallery modes

Datsyuk¹

2004

Semicond. Phys. Quantum Electron. Optoelectron.

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Formulae for the intensity of the resonant spontaneous electric-dipole emission are derived in the framework of classical electrodynamics and quantum optics making allowance for inhomogeneous light absorption. Using these formulas, the physical backgrounds of a micrometer-sized optical sensor exploiting the properties of the whispering-gallery modes (WGMs) are studied. The role of the evanescent WGM's field in the considered optical effects is examined.

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Optics of microdroplets

Cited by 25 publications

References 192 publications

Fluorescence of a Liquid Drop with a Dye Excited by Femtosecond Laser Pulses

Fluorescence of a Liquid Drop with a Dye Excited by Femtosecond Laser Pulses

Properties of a laser based on evanescent-wave amplification

Properties of optical microsensor based on observation of whispering-gallery modes

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