Schallabsorption und -dispersion in wäßrigen Elektrolytlösungen

Tamm, K.

doi:10.1007/978-3-642-45956-6_3

Cited by 7 publications

(6 citation statements)

References 61 publications

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“…The broad frequency spectrum of sharp pulses (figure 5) allows us to determine group and phase velocities as well as the attenuation coefficient in a considerable frequency range [42,58,69,117,118,127]. In this respect 'broadbandpulse' measurements resemble time domain methods, such as pressure and electrical field jump and, last but not least, temperature jump techniques [70,74,95,99,128,129]. In the past and still today, these transient methods have been successfully applied for the study of fast chemical reactions.…”

Section: Pulse Methodsmentioning

confidence: 99%

“…In this review several methods of sound velocity measurements, matched to the widespread applications, will be reviewed briefly. General information about acoustics, especially sound fields, transducers and applied techniques, has already been presented in numerous monographs [4,71,72,74,[76][77][78][86][87][88][89][90][91][92][93][94], book contributions [70,73,79,[95][96][97] and reviews [5,75,98,99]. Early benchmark publications are referred to, for instance, in [70,76,78,86,87,95].…”

Section: Introductionmentioning

confidence: 99%

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Ultrasonic velocity measurements in liquids with high resolution—techniques, selected applications and perspectives

Kaatze

Eggers

Lautscham

2008

Meas. Sci. Technol.

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This review gives a short introduction into the principles of sound velocity measurements. The fundamentals of acoustical methods using continuous waves, pulse modulated signals and sharp pulses are summarized. Methods employing optical wave interactions with continuous ultrasonic waves are also described briefly. Recent advances in the different methods are presented, and the technical status of the currently preferred techniques is discussed in view of their merits and limitations, too. Particular emphasis is given to the sensitivity and accuracy of the methods. Selected examples of measurement applications indicate the extended usability spectrum in basic research as well as in materials' characterization, manufacturing processes and control routines.

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Section: Pulse Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrasonic velocity measurements in liquids with high resolution—techniques, selected applications and perspectives

Kaatze

Eggers

Lautscham

2008

Meas. Sci. Technol.

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“…Evaluation strategies for concave resonators will be discussed in section 2.6. Spherical resonators (of perfectly concave shape) are the 'classical' resonators; the lowest frequencies in the kilohertz range have been reached with these devices (Tamm 1952, Kurtze and Tamm 1953, Wilson and Leonard 1954, Karpovich 1954, Lawley and Reed 1955, Ohsawa and Wada 1957, Ohsawa and Yasuda 1974. Besides the requirement of rather large quantities of liquid, serious problems have arisen from non-spherical deformation due to gravitational forces, leading to a perturbation of the radial modes and the induction of shear losses at the vessel wall.…”

Section: Concave Reflectorsmentioning

confidence: 99%

Broad-band ultrasonic measurement techniques for liquids

Eggers

Kaatze

1996

Meas. Sci. Technol.

145

104

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Various methods for broad-band ultrasonic absorption and velocity measurements in liquids, using CW and pulsed signals, are reviewed. Several different ultrasonic spectrometric techniques are required to cover the wide range of liquid wavelength and attenuation values that exist in the kilohertz to gigahertz frequency range. Advantages and problems of various ultrasonic and related methods are discussed. Sonic cells for liquids and electronic equipment for spectral measurements are presented. Together with applications in relaxation spectrometry, examples of broad-band ultrasonic absorption spectra, utilizing different CW resonator and pulse-modulated travelling wave techniques, are presented.

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“…Tamm states are a kind of electronic states localized at the surface of the solid in the energy band gap, which was first pointed out by Tamm [ 29 ] and observed in the semiconductor superlattice with a terminating layer. [ 30 ] The localized interface modes were observed at the boundary between two periodic dielectric structures in the optical band gap.…”

Section: Introductionmentioning

confidence: 99%

Strong Self‐Enhancement of Optical Nonlinearity in a Topological Insulator with Generation of Tamm State

Lu,

Shi,

et al. 2023

Laser & Photonics Reviews

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As new states of matter currently attracting broad attention in the optics field, topological insulators (TIs) present topologically‐protected conducting surface states surrounding insulating bulk and prominent third‐order optical nonlinearities in an ultrawide frequency range. Optical frequency conversion in TI nanofilms plays a crucial role in TI nonlinear optical functionalities, whose enhancement is in demand for high‐performance devices. Herein, an optical Tamm state is observed between the Sb2Te3 TI nanofilm and 1D photonic crystal (PC) as well as a self‐enhancement behavior of optical nonlinearity in the TI nanofilm. The experiments demonstrate that there exists a distinct reflection dip in the forbidden band of the PC, which is attributed to the appearance of Tamm state in the TI/PC structure. The wavelength of the TI‐based Tamm state possesses a nearly linear redshift with increasing TI film thickness. The measurements are in excellent agreement with simulation and theoretical calculations. Moreover, a strong third‐harmonic generation reinforcement of 30‐fold is experimentally observed in a 90 nm Sb2Te3 film, which stems from the field enhancement induced by the TI self‐excited Tamm state at the fundamental frequency. This work opens a new door for generation of optical Tamm states and applications of TIs in high‐efficiency nonlinear optical functionalities, especially frequency conversion.

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Schallabsorption und -dispersion in wäßrigen Elektrolytlösungen

Cited by 7 publications

References 61 publications

Ultrasonic velocity measurements in liquids with high resolution—techniques, selected applications and perspectives

Ultrasonic velocity measurements in liquids with high resolution—techniques, selected applications and perspectives

Broad-band ultrasonic measurement techniques for liquids

Strong Self‐Enhancement of Optical Nonlinearity in a Topological Insulator with Generation of Tamm State

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