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Showing 1 to 13 of 13 for “"Optical process"”.
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Investigation of the suitability of amorphous semiconductors as sensors for optical process tomography
… of amorphous semiconductors as hard field optical sensors for application in optical process tomography (OPT) has been established. Two amorphous semiconductors were selected for the study, these being amorphous arsenic triselenide (a-As 2 Se3) and hydrogenated amorphous silicon (a-Si:H). …
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Nonlinear aluminum nitride photonic crystal measurement using tapered fiber
Second harmonic generation is a nonlinear optical process that is an important bridge in the conversion between infrared and visible light. A ring resonator with a top layer of aluminum nitride, a material with high second order susceptibility, can achieve an efficient coupling between 780 nm …
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Dynamics of Electronic Wavepackets in Atomic Rubidium
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-26T21:43:14Z No. of bitstreams: 1 oldenburg.pdf: 2719888 bytes, checksum: 312e1856e8742d2e5073aa8673f96b74 (MD5)
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Nonlinear optical processes and the nearest neighbor distribution in rubidium vapor
Nonlinear optical processes, with a particular emphasis on parametric four-wave mixing (PFWM), are studied in rubidium vapor. A theoretical framework is introduced that enables accurate calculations of nonlinear light-matter interactions, and calculations of these interactions using this framework …
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Numerical modelling of ocular accommodation process
… is simultaneously a mechanical and an optical process and investigation of such a complex system requires advanced methods in both fields. There are at least two major processes that bring about changes in this system; the accommodation process and age-dependent deterioration of this …
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High efficiency top-emitting organic light-emitting diodes: design and fabrication
… includes almost every important electrical and optical process involved in the device. Finally, techniques and methods used to improve the device performance are summarized, which includes electrical doping of charge carrier transport layers. In Chapter 3, all organic materials, experimental …
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In Vivo Assessment of the Forward to Backward Ratio of Second Harmonic Generation By Collagen As Part of a Non-Invasive, All-Optical Biopsy for Skin Cancer
… indicate pathology in skin. SHG, a non-linear optical process where two near-infrared photons of a certain energy are converted to one UV photon of twice the energy at a non-centrosymmetric molecule such as collagen. It has been demonstrated that the forward-to-backward scatter SHG ratio is …
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Noise Suppression in OCDMA Networks using Nonlinear Optical Devices
Optical code division multiple access (OCDMA) is a multiplexing technique that has a number of inherent advantages that make it suitable for use in passive optical networks, such as allowing subscribers to transmit information in an asynchronous fashion over a single optical fibre. This form of …
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Ionic Self-Assembled Multilayers in a Long Period Grating Sensor for Bacteria and as a Source of Second-Harmonic Generation Plasmonically Enhanced by Silver Nanoprisms
… generation (SHG). SHG is a nonlinear optical process in which light is instantaneously converted to half its wavelength in the presence of intense electric fields. Localized surface plasmons (LSPs) in metal nanoparticles produce strong electric field enhancements, especially at sharp …
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Electrochemical and spectroscopic interfacial investigations of small organic molecule electrooxidation on platinum electrodes
… SFG is based on a second order nonlinear optical process that is forbidden in centrosymmetric media. Therefore, SFG is intrinsically interface-sensitive and enables surface chemical measurements without contribution from the bulk. With the aid of a femtosecond IR laser, we probe …
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Lighting a building with a single bulb : toward a system for illumination in the 21st c.; or, A centralized illumination system for the efficient decoupling and recovery of lighting related heat
… by an electric lamp or the sun is available for optical concentration and for reconstitution as a high thermodynamic quality power reservoir. Piping light from a large central lamp facilitates the decoupling of lighting related heat at the source, and also means that the efficiency of one central …
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Four-Wave Mixing Techniques Applied to the Investigation of Non-Adiabatic Dynamics in Polyatomic Molecules
… of photochemical reactions and photobiological processes. In order to approach this complex problem, different strategies within the framework of time-resolved, four-wave mixing spectroscopy were developed that allowed for the dynamic as well as the energetic aspects of vibronic coupling in …
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Adaptive control of coherent soft X-rays
… of coherent soft x-rays through the nonlinear optical process of high-harmonic generation allows for the monitoring of the fastest events ever observed in the laboratory. The attosecond pulses produced are the fundamental tool for the time-resolved study of electron motion in atoms, molecules, …