A5089504947- Solid-state spectroscopy and crystallography
- Nonlinear Optical Materials Research
- Glass properties and applications
- Photonic and Optical Devices
- Mechanical and Optical Resonators
- Optical and Acousto-Optic Technologies
- Mineralogy and Gemology Studies
- Optical Polarization and Ellipsometry
- Astro and Planetary Science
- Spectroscopy and Quantum Chemical Studies
- Photorefractive and Nonlinear Optics
- Liquid Crystal Research Advancements
- Molecular spectroscopy and chirality
- Acoustic Wave Resonator Technologies
- Astrophysics and Star Formation Studies
- Planetary Science and Exploration
- Crystal Structures and Properties
- Chemical Synthesis and Analysis
- Random lasers and scattering media
- Protein Structure and Dynamics
- Calibration and Measurement Techniques
- Spectroscopy Techniques in Biomedical and Chemical Research
- Spacecraft and Cryogenic Technologies
- Stellar, planetary, and galactic studies
- Photoreceptor and optogenetics research
Leibniz Institute of Photonic Technology
2013-2022
Beer's law assumes a linear dependence of absorbance on concentration, accordingly the index absorption and molar attenuation coefficient are material properties cross section, including itself, must be additive if chemical interactions excluded. Under "no interaction" condition, should also exist between macroscopic polarization number induced dipole moments per unit volume. The latter is basis for dispersion theory. Invoking Maxwell's wave equation, has been derived recently from As...
ABSTRACT Optical properties are required for the correct understanding and modelling of protoplanetary debris discs. By assuming that comets most pristine bodies in Solar system, our goal is to derive optical constants real material. We determine complex index refraction near-surface material comet 67P/Churyumov–Gerasimenko by fitting sub-millimetre/millimetre observations thermal emission comet’s sub-surface made Microwave Instrument Rosetta Orbiter with synthetic temperatures derived from...
Abstract Here we present a general approach for the description frequency dependent dielectric tensor coefficients optically anisotropic materials. Based on symmetry arguments show that components of are in not independent each other. For excitation there exists an eigensystem, where its contribution to can be described by diagonal susceptibility tensor. From orientation eigensystem and relative magnitude elements, dipole interaction distribution real space deduced. In limiting cases,...
Context. It has been widely accepted that corundum particles condense in the atmospheres of oxygen-rich asymptotic giant branch stars and effectively produce an infrared emission feature at 13 μ m. Laboratory experiments have predicted these shape oblate spheroids. Aims. We investigate influence material anisotropy uniaxial on absorption cross section spectra medium sized spheroidal spectral region. Methods. compared cross-section anisotropic gained by finite-difference time-domain...
A classical way of describing a dielectric function employs sums contributions from damped harmonic oscillators. Each term leads to maximum in the imaginary part at transversal optical (TO) resonance frequency corresponding oscillator. In contrast, peak maxima negative inverse are attributed so-called longitudinal (LO) oscillator frequencies. The shapes bands resemble those function. Therefore, it seems natural also employ oscillators describe this contribution, we derive dispersion...
IntroductionOptical properties are required information for correct models of the early solar system and protoplanetary disks. To this day used in mostly provided by laboratory studies primitive analogs. Comets provide us with a closer analog to material but have been, until recently, difficult observe. Rosetta has given unique opportunity observe unprecedented accuracy.The Microwave Instrument Orbiter (MIRO) (Gulkis et al. 2007) measured thermal radiation emitted from subsurface comet...