Photoacoustic absorption measurements of optical materials and thin films

1980 ◽  
Vol 51 (8) ◽  
pp. 4361-4364 ◽  
Author(s):  
Allan Rosencwaig ◽  
J. B. Willis
Keyword(s):  
Thin Films ◽  
Optical Materials ◽  
Photoacoustic Absorption ◽  
Absorption Measurements

Study of optical parameters of Sulphur doped Se-As thin films as optical materials

Optik ◽  
2021 ◽  
pp. 167447
Author(s):  
Anjani Kumar ◽  
R.K. Shukla ◽  
Rajeev Gupta
Keyword(s):  
Thin Films ◽  
Optical Materials ◽  
Optical Parameters

scholarly journals Reconfigurable Flat Optics with Programmable Reflection Amplitude Using Lithography‐Free Phase‐Change Material Ultra‐Thin Films (Advanced Optical Materials 2/2021)

2021 ◽  
Vol 9 (2) ◽  
pp. 2170006
Author(s):  
Sébastien Cueff ◽  
Arnaud Taute ◽  
Antoine Bourgade ◽  
Julien Lumeau ◽  
Stephane Monfray ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Change ◽  
Phase Change Material ◽  
Optical Materials ◽  
Reflection Amplitude ◽  
Change Material

The Influence of Ordering on the Photoinduced Charge Transfer in Composites of Phenyl-type Substituted Polythiophenes with Methanofullerenes

1999 ◽  
Vol 598 ◽  
Author(s):  
Christoph J. Brabec ◽  
Christoph Winder ◽  
Markus C. Scharber ◽  
N. Serdar Sariciftci ◽  
Mats R. Andersson ◽  
...  
Keyword(s):  
Thin Films ◽  
Charge Transfer ◽  
Treatment Results ◽  
Generation Efficiency ◽  
Charge Generation ◽  
Photoinduced Charge Transfer ◽  
Strong Electron ◽  
Low Energies ◽  
Photoinduced Charge ◽  
Absorption Measurements

ABSTRACTRegioregular polythiophenes baring 3-(p-methoxyethoxyethoxy)-phenyl substituents (PEOPT) show high photoluminescence efficiencies. Exposing thin films of this polymer to vapors of chloroform or annealing them by heat treatment results in a red shift of the absorption maximum due to solvent or heat induced ordering which gives rise to more planar conformations. The fact, that annealed thin films of PEOPT exhibit absorption edges at relatively low energies and thus have an enhanced spectral range makes them suitable for use in photodiodes / solar cells. The photoinduced charge generation efficiency in PEOPT is significantly enhanced by the addition of a strong electron acceptor like fullerene, as observed by quenching of the luminescence and by photoinduced absorption measurements in the infrared and UV-Vis regime. The efficiency of the photoinduced charge transfer from PEOPT to a methanofullerene is found to depend on the ordering of PEOPT in thin films.

Optical Propagation in Solids

2006 ◽  
Author(s):  
Michael E. Thomas
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Solid State ◽  
Optical Fibers ◽  
Optical Materials ◽  
Photonic Devices ◽  
Index Of Refraction ◽  
Optical Detectors ◽  
Optical Propagation ◽  
Valence Bands

This chapter emphasizes the linear optical properties of solids as a function of frequency and temperature. Such information is basic to understanding the performance of optical fibers, lenses, dielectric and metallic mirrors, window materials, thin films, and solid-state photonic devices in general. Optical properties are comprehensively covered in terms of mathematical models of the complex index of refraction based on those discussed in Chapters 4 and 5. Parameters for these models are listed in Appendix 4. A general review of solid-state properties precedes this development because the choice of an optical material requires consideration of thermal, mechanical, chemical, and physical properties as well. This section introduces the classification of optical materials and surveys other material properties that must be considered as part of total optical system design involving solidstate optics. Solid-state materials can be classified in several ways. The following are relevant to optical materials. Three general classes of solids are insulators, semiconductors, and metals. Insulators and semiconductors are used in a variety of ways, such as lenses, windows materials, fibers, and thin films. Semiconductors are used in electrooptic devices and optical detectors. Metals are used as reflectors and high-pass filters in the ultraviolet. This type of classification is a function of the material’s electronic bandgap. Materials with a large room-temperature bandgap (Eg > 3eV) are insulators. Materials with bandgaps between 0 and 3 eV are semiconductors. Metals have no observable bandgap because the conduction and valence bands overlap. Optical properties change drastically from below the bandgap, where the medium is transparent, to above the bandgap, where the medium is highly reflective and opaque. Thus, knowledge of its location is important. Appendix 4 lists the bandgaps of a wide variety of optical materials. To characterize a medium within the region of transparency requires an understanding of the mechanisms of low-level absorption and scattering. These mechanisms are classified as intrinsic or extrinsic. Intrinsic properties are the fundamental properties of a perfect material, caused by lattice vibrations, electronic transitions, and so on, of the atoms composing the material.

Bulk absorption measurements of highly transparent DUV/VUV optical materials

2004 ◽  
Author(s):  
Christian Muhlig ◽  
Siegfried Kufert ◽  
Wolfgang Triebel ◽  
Frank Coriand ◽  
Lutz Parthier ◽  
...  
Keyword(s):  
Optical Materials ◽  
Bulk Absorption ◽  
Absorption Measurements

In situ monitoring the role of citrate in chemical bath deposition of PbS thin films

CrystEngComm ◽  
2016 ◽  
Vol 18 (1) ◽  
pp. 149-156 ◽  
Author(s):  
Sucheta Sengupta ◽  
Maayan Perez ◽  
Alexander Rabkin ◽  
Yuval Golan
Keyword(s):  
Thin Films ◽  
Light Scattering ◽  
Optical Absorption ◽  
Chemical Bath Deposition ◽  
Trisodium Citrate ◽  
In Situ Monitoring ◽  
Cluster Mechanism ◽  
Absorption Measurements

We report the formation of size tunable PbS nanocubes induced by the presence of trisodium citrate during growth of PbS thin films by chemical bath deposition. The presence of citrate induces growth by the cluster mechanism which is monitored by XRD and HRSEM, along with real time light scattering and optical absorption measurements.

scholarly journals Active Nanophotonics: Surface Polariton‐Like s‐Polarized Waveguide Modes in Switchable Dielectric Thin Films on Polar Crystals (Advanced Optical Materials 5/2020)

2020 ◽  
Vol 8 (5) ◽  
pp. 2070018 ◽  
Author(s):  
Nikolai Christian Passler ◽  
Andreas Heßler ◽  
Matthias Wuttig ◽  
Thomas Taubner ◽  
Alexander Paarmann
Keyword(s):  
Thin Films ◽  
Optical Materials ◽  
Surface Polariton ◽  
Dielectric Thin Films ◽  
Polar Crystals ◽  
Waveguide Modes
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