An amplitude Fourier spectrometer for infrared solid state spectroscopy

Gast, J.; Genzel, L.

doi:10.1016/0030-4018(73)90173-9

Cited by 44 publications

(3 citation statements)

References 7 publications

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“…17.4) which exhibits a plasma edge shifting to higher frequencies with increasing density n of electronic carriers. -Very similar optical constants are obtained for InAs (GAST, 1972). y) Zinc-chalcogenides.…”

Section: Infrared Spectra Of Crystals With Mixed Ionic and Covalent Csupporting

confidence: 69%

Vibrational Infrared and Raman Spectra of Non-Metals

Bilz¹,

Strauch²,

Wehner³

1984

Light and Matter Id / Licht Und Materie Id

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The vibrational properties of crystals determine the photon infrared absorption, inelastic neutron scattering and, to a large extent, inelastic photon scattering by phonons, i.e., Raman scattering. The interpretation of infrared and Raman spectra requires, therefore, an understanding of the basic features of lattice dynamics. The quantum theory of solids describes the crystal properties in terms of elementary excitations and their mutual interactions. Dynamic properties are represented by phonons (lattice vibrations) and their interactions mainly with other phonons (anharmonicity), electrons (electron-phonon coupling), and photons (interaction with radiation). This characterizes the scope of the article. Its emphasis is on the interrelation between theory and experiment, i.e., on the microscopic or model interpretation of experimental spectra.Work on infrared absorption and Raman scattering of non-metallic solids was summarized twenty years ago in two review articles in this Encyclopedia by LECOMTE (1958) and by MIZUSHIMA (1958). Since then, many important new experimental data have become available, thanks to very refined techniques for measuring spectra of pure and imperfect single crystals. Furthermore, the theory of the interactions of phonons and photons has been much improved, stimulated by the remarkable development of the theory of lattice vibrations and the mathematical techniques of many-body physics.In this article we describe the dispersion and absorption of infrared radiation and Raman scattering in non-metallic crystals, both perfect and containing point defects. At present, quantitative calculations are usually restricted to diatomic crystals, especially those with simple structures such as the alkali halides or germanium and its homologues, since our knowledge of lattice vibrations is still rather poor for polyatomic and low-symmetry crystals. The theory of lattice vibrations, as reviewed by COCHRAN and COWLEY (1967) in Vol. XXV /2a of this Encyclopedia, constitutes the background and the natural starting point for our investigations. There are other recent reviews by LUDWIG (1967), COCHRAN (1971), MARADUDIN et al. (1971), SINHA (1973), and several articles in: HORTON and MARADUDIN (eds., 1974). A summary of the developments during the last few years is given in Chap. B.An important part of the theory of lattice vibrations is the construction of models. A good example is the so-called shell model for phonons (see Sect. 4) which describes the adiabatic linear electron-ion interaction in terms of localized charges and coupling constants. This provides a natural explanation of some long-range ion-ion forces in insulators in terms of induced dipole forces. Anharmonic extensions of this shell model and its modifications seem very desirable, and first attempts in this direction are discussed.Models can often give a qualitatively and sometimes quantitatively correct description of certain processes in terms of a few parameters. They provide, therefore, an orientation for microscopic approaches. Furthermo...

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Section: Infrared Spectra Of Crystals With Mixed Ionic and Covalent Csupporting

confidence: 69%

Vibrational Infrared and Raman Spectra of Non-Metals

Bilz¹,

Strauch²,

Wehner³

1984

Light and Matter Id / Licht Und Materie Id

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“…With the increasing importance of glasses in low-loss fibre optic communications it is necessary to have a full understanding of the dispersive mechanisms associated with these bands in order to predict their contributions to the absorption at the important near-infrared wavelengths. We have used dispersive Fourier transform spectrometry (FTS), as applied to lossy solids (Bell 1966, Gast and Genzel 1973, Chamberlain et aZl974, Parker et a2 1974, to extend existing millimetre (Birch and Stone 1973) and submillimetre (Hadni et al 1965, Mashkovich and Demeshina 1965, Dianov et al 1967, Bagdade and Stolen 1968) wavelength measurements of the optical constants of ordinary soda-lime-silica glasses to 360 cm-1, which is almost at the peak of the absorption feature. Loss and permittivity measurements at 0.29 and 1.16 cni-1 and near-infrared transmission measurements were also made to show the full extent of the band and its profile in the wing regions.…”

Section: Introductionmentioning

confidence: 99%

The optical constants of ordinary glass from 0.29 to 4000 cm^-1

Birch

Cook

Harding

et al. 1975

J. Phys. D: Appl. Phys.

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The optical constants of ordinary soda-lime-silica glasses in their region of intense submillimetre wavelength opacity have been measured from 0.29 to 4000 cm-1 at 293K using microwave cavity techniques, dispersive Fourier transform spectrometry and near-infrared spectrometry. The measurements reach almost the peak of the absorption spectrum, with values of the power absorption coefficient of about 1500 neper cm-1. The strong refractive index dispersion associated with this absorption is clearly resolved.

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“…The complex optical constant can be determined by the complex Fourier transform of the interferogram that is obtained from the asymmetric interferometer system. 18,19) In this section, we focus on the signal enhancement effect, and estimate the enhancement with signal modulation. Figure 2 shows schematic illustrations of (a) symmetric and (b) asymmetric interferometers.…”

Section: Asymmetric Configurationmentioning

confidence: 99%

Improvement of infrared near-field spectrum by asymmetric interferometer configuration

Ikemoto

Okamura

Moriwaki

et al. 2015

Jpn. J. Appl. Phys.

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Infrared synchrotron radiation (IR-SR) is a highly brilliant white light source. We are developing an infrared near-field spectroscopy system with an IR-SR light source. The near-field spectroscopy system previously reported comprised an atomic force microscope (AFM) and a commercial Fourier transform infrared (FTIR) spectrometer. In the present study, the configuration of the FTIR interferometer has been modified to an asymmetric one. In the asymmetric interferometer, one beam split by a beamsplitter is focused onto the tip of an AFM probe, and the other beam goes to a movable mirror. The scattered light from the probe and the light reflected by the movable mirror interfere with each other. The near-field signal is extracted by a modulation method with an AFM oscillation frequency. The signal-to-noise ratio has been improved 6-fold and the signal-to-background ratio is improved 8-fold compared with those observed in the previous system.

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An amplitude Fourier spectrometer for infrared solid state spectroscopy

Cited by 44 publications

References 7 publications

Vibrational Infrared and Raman Spectra of Non-Metals

Vibrational Infrared and Raman Spectra of Non-Metals

The optical constants of ordinary glass from 0.29 to 4000 cm^-1

Improvement of infrared near-field spectrum by asymmetric interferometer configuration

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An amplitude Fourier spectrometer for infrared solid state spectroscopy

Cited by 44 publications

References 7 publications

Vibrational Infrared and Raman Spectra of Non-Metals

Vibrational Infrared and Raman Spectra of Non-Metals

The optical constants of ordinary glass from 0.29 to 4000 cm-1

Improvement of infrared near-field spectrum by asymmetric interferometer configuration

Contact Info

Product

Resources

About

The optical constants of ordinary glass from 0.29 to 4000 cm^-1