Download or read book Study of Infrared Nonlinear Processes in Semiconductors written by Peter A. Wolff and published by . This book was released on 1988 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: This program includes: 1.) Demonstration that phase transitions and electrical instabilities enhance optical nonlinearities in semiconductors. 2.) Discovery of exceedingly large third order optical nonlinearities CUBED CHI . 0.001 ESU with picosecond response time in zero gap materials (HgTe, HgCdTe, HgMnTe). 3.) First observation of impurity-induced optical nonlinearity in semiconductors. 4.) Prediction and observation of negative absolute carrier mobilities in quantum wells. (RH).
Download or read book Optical Properties of Small Band Gap Semiconductors Subject to Laser Excitation Nonlinear Infrared Properties of Semiconductors written by T. C. McGill and published by . This book was released on 1982 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical and experimental study of the optical properties of small band gap semiconductors subject to laser excitation and the nonlinear infrared properties of small band gap semiconductors subject to laser excitation and the nonlinear infrared properties of semiconductors has been carried out. These studies have led to an understanding of the nonradiative recombination mechanisms due to impurities via an Auger process. Predictions about the role of radiative and nonradiative processes in narrow band gap semiconductors have been made. Experiments performed on HgCdTe alloys with different composition provided the first systematic study of photoluminescence in these alloys and gave data that supported the conclusions on the relative importance of radiative and nonradiative processes in alloys. The study of the nonlinear infrared properties in the semiconductors resulted in the first complete theory of the phenomenon. Experiments to measure the role of impurities on the saturation intensity have given results in good agreement with theory. (Author).
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nonlinear Optical Processes in Two Dimensional Semiconductor Structures written by Yongrui Wang and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The optical properties of two types of two-dimensional (2D) semiconductor structures are studied. One of them is for structures based on quantum wells (QWs), and the other is graphene. We study the dynamics of optically excited electron-hole plasma or magnetoplasma in uncoupled QW structure. Experimentally we have observed a delayed burst of optical pulse, or super fluorescence (SF). Time and energy-resolved measurement shows the center frequency of the pulse is red-shifting with time. We explain this by developing the generalized semiconductor Bloch equations (SBEs), where Coulomb interaction between electrons is taken into account. For electronhole plasma in quasi-equilibrium, the calculation shows the peak gain is near the Fermi-edge. So, the red-shifting is because of the decreasing of Fermi energy with time. The effect of Coulomb interaction in intersubband transitions is also studied, where we have developed equations similar to the SBEs, and show that the Coulomb effect could enhance particular second-order nonlinear optical processes. Quantum cascade lasers (QCLs) are well developed devices based on QWs. We study the active modulation in mid-infrared (mid-IR) QCLs. We show that QCLs with short gain recovery time can also generate short pulses by active modulation, while it is previously thought active modulation can only be applied for QCLs with long gain recovery time. Comparisons between the two cases show the performance of QCLs with short gain recovery time is more robust for active modulation. Also, mode-locking can be achieved by tuning the modulation period. As a natural 2D material, graphene has linear energy dispersion near the Dirac points. This leads to interesting electronic and optical properties. Under Landau quantization, we propose a scheme for achieving continuous-wave terahertz (THz) gain by mid-IR pumping. In this scheme, scattering of surface-optical (SO) phonons from the substrate is utilized to populate the upper laser state. All the important scattering processes are calculated to justify the design. We also study the properties of second-harmonic generation (SHG) in graphene without magnetic field. The experimental measurement shows peculiar relations between the polarizations of fundamental light and second-harmonic (SH) light. We develop a quantum theory to explain the observations. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/155620
Download or read book Energy Research Abstracts written by and published by . This book was released on 1989 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book FY US Air Force Plan for Defense Research Sciences written by and published by . This book was released on 1985 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cooperative Research Associateships Post Doctoral Research Awards written by and published by National Academies. This book was released on 1990 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics and Applications of Non Crystalline Semiconductors in Optoelectronics written by A. Andriesh and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Workshop on Physics and Application of Non-crystalline Semiconductors in Optoelectronics was held from 15 to 17 October 1996 in Chisinau. republic of Moldova and was devoted to the problems of non-crystalline semiconducting materials. The reports covered two mjlin topics: theoretical basis of physics of non -crystalline materials and experimental results. In the framework of these major topics there were treated many subjects. concerning the physics of non-crystalline semiconductors and their specific application: -optical properties of non-crystalline semiconductors; -doping of glassy semiconductors and photoinduced effects in chalcogenide glasses and their application for practical purposes; -methods for investigation of the structure in non-crystalline semiconductors -new glassy materials for IR trasmittance and optoelectronics. Reports and communications were presented on various aspects of the theory. new physical principles. studies of the atomic structure. search and development of optoelectronics devices. Special attention was paid to the actual subject of photoinduced transformations and its applications. Experimental investigations covered a rather wide spectrum of materials and physical phenomena. As a novel item it is worth to mention the study of nonlinear optical effects in amorphous semiconducting films. The third order optical non linearities. fast photoinduced optical absorption and refraction. acusto-optic effects recently discovered in non-crystalline semiconductors could potentially be utilised for optical signal processing. The important problems of photoinduced structural transformations and related phenomena. which are very attractive and actual both from the scientific and practical points of view. received much attention in discussions at the conference.
Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1058 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research and Technology Program Digest Flash Index written by and published by . This book was released on 1967 with total page 794 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nonlinear Meta Optics written by Costantino De Angelis and published by CRC Press. This book was released on 2020-05-20 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses fabrication as well as characterization and modeling of semiconductor nanostructures in the optical regime, with a focus on nonlinear effects. The visible range as well as near and far infrared spectral region will be considered with a view to different envisaged applications. The book covers the current key challenges of the research in the area, including: exploiting new material platforms, fully extending the device operation into the nonlinear regime, adding re-configurability to the envisaged devices and proposing new modeling tools to help in conceiving new functionalities. • Explores several topics in the field of semiconductor nonlinear nanophotonics, including fabrication, characterization and modeling of semiconductor nanostructures in the optical regime, with a focus on nonlinear effects • Describes the research challenges in the field of optical metasurfaces in the nonlinear regime • Reviews the use and achievements of all-dielectric nanoantennas for strengthening the nonlinear optical response • Describes both theoretical and experimental aspects of photonic devices based on semiconductor optical nanoantennas and metasurfaces • Gathers contributions from several leading groups in this research field to provide a thorough and complete overview of the current state of the art in the field of semiconductor nonlinear nanophotonics Costantino De Angelis has been full professor of electromagnetic fields at the University of Brescia since 1998. He is an OSA Fellow and has been responsible for several university research contracts in the last 20 years within Europe, the United States, and Italy. His technical interests are in optical antennas and nanophotonics. He is the author of over 150 peer-reviewed scientific journal articles. Giuseppe Leo has been a full professor in physics at Paris Diderot University since 2004, and in charge of the nonlinear devices group of MPQ Laboratory since 2006. His research areas include nonlinear optics, micro- and nano-photonics, and optoelectronics, with a focus on AlGaAs platform. He has coordinated several research programs and coauthored 100 peer-reviewed journal articles, 200 conference papers, 10 book chapters and also has four patents. Dragomir Neshev is a professor in physics and the leader of the experimental photonics group in the Nonlinear Physics Centre at Australian National University (ANU). His activities span over several branches of optics, including nonlinear periodic structures, singular optics, plasmonics, and photonic metamaterials. He has coauthored 200 publications in international peer-reviewed scientific journals.
Download or read book Recent Awards in Engineering written by and published by . This book was released on 1983 with total page 986 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Air Force Research Resum s written by and published by . This book was released on with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book RLE Progress Report written by Massachusetts Institute of Technology. Research Laboratory of Electronics and published by . This book was released on 1985 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Frontiers in Nonlinear Optics The Sergei Akhmanov Memorial Volume written by H. Walther and published by CRC Press. This book was released on 2021-07-28 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: In tribute to the memory of Sergei Akhmanov, a pioneer in the field, Frontiers in Nonlinear Optics presents an overview of quantum electronics and nonlinear optics. The contributors, world leaders in this field, provide up-to-date surveys and current trends to ensure comprehensive coverage in all aspects of nonlinear optics. This fascinating collection is necessary reading both for researchers entering the field and for established researchers in nonlinear optics.
Download or read book Government Reports Annual Index Keyword A L written by and published by . This book was released on 1988 with total page 1600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Government Research Reports written by and published by . This book was released on 1964 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
