Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 385 for “"two-photon"”.
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Fast scanning two-photon microscopy
Fast scanning two-photon microscopy coupled with the use light activated ion channels provides the basis for fast imaging and stimulation in the characterization of in vivo neural networks. A two-photon microscope capable of fast scanning using acousto-optic deflectors was designed and implemented. …
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THz transceiver/two-photon absorption autocorrelator
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Synthesis, Characterizations, And Evaluation Of New Reactive Two-photon Absorbing Dyes For Two-photon Excited Fluorescence Imaging Applications
… in the emergence of a novel area termed 'biophotonics'. The integrative and interdisciplinary nature of biophotonics cuts across virtually all disciplines, extending the frontiers of basic cellular, molecular, and biology research through the clinical and pharmaceutical industries. This holds …
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Subsurface two-photon lithography: improvements and applications
Two-photon lithography has previously been used to fabricate a variety of three-dimensional structures where the material is uniform throughout. When performing subsurface controllable refractive index via beam exposure (SCRIBE), two-photon lithography is implemented with a porous material as the …
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Ad-hoc models for two-photon detectors
Thesis (Elec.E)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1980.
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Two-photon spectroscopy of trapped atomic hydrogen
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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Two photon parametric conversion of Moessbauer gamma rays
This thesis considers aspects of parametric conversion of Mossbauer gamma rays. This process is important because it could be used to tune the output of a gamma ray laser; but, furthermore, it is a process of fundamental intrinsic interest in quantum electrodynamics. We first calculate the S matrix …
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Theory Advances in High-Precision Two-Photon Spectroscopy
High-precision two-photon spectroscopy of hydrogen and hydrogenlike systems constitutes an exceptional tool for experimental tests of fundamental theories. In the analysis of these experiments, theory also plays a vital role in the modeling of time-resolved spectra, the calculation of precise …
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Two -Photon Polymerization of Defects in Photonic Crystals
… PBG, it is necessary to convert colloidal photonic crystals to higher refractive index structures that exhibit complete PBGs. To this end, self-assembled photonic crystals with embedded TPP features were replicated in silicon. The TPP features and colloidal crystal served as a template for …
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One- and Two -Photon States for Quantum Information
The expression of the transgene gus was studied in all 40 callus lines, 12 regenerated T0 plants and the T1 and T2 progenies of 5 lines. The isogenic SC lines had an average expression level based on the activity of beta-glucuronidase of 158 +/- 9 units/mg protein (mean +/- SEM; n=3; variance …
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One- and two-photon states for quantum information
Using correlated photons from parametric downconversion, we extend the boundaries of experimentally explored one- and two-qubit Hilbert space. These states are used to explore a variety of topics in quantum information. Specifically, we have created and characterized arbitrary single-qubit states …
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Two photon transitions in laser pumped submillimeter lasers
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Physics.
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One and two photon absorption of atoms and ions
One and two-photon photoabsorption of atoms and ions is the primary focus of this study, with special emphasis on photoabsorption in a laser-produced strontium plasma. The dual laser plasma (DLP) technique has been employed to carry out these studies and adapted to include an optical parametric …
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Nanoshells in vivo imaging using two-photon excitation microscopy
… in small animal blood vessel imaging. Two types of gold-silica nanoshells excitable by NIR lasers are investigated: Type 1 nanoshells can be excited with a sub-mum NW laser, whereas Type 2 nanoshells can be excited with a NW laser in the micrometer range. Using NIR microscopy as an …
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Triphenylmethylium-Based Multitopic Two-Photon Absorbers: Synthesis and Characterization
… These characteristics, and more precisely their two-photon absorption (TPA) properties, make them attractive for the design of high technology materials (microfabrication, imaging, optical devices, etc). However, their multiphoton absorption properties and other related nonlinear optical (NLO) …
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Triphenylmethylium-Based Multitopic Two-Photon Absorbers: Synthesis and Characterization
… These characteristics, and more precisely their two-photon absorption (TPA) properties, make them attractive for the design of high technology materials (microfabrication, imaging, optical devices, etc). However, their multiphoton absorption properties and other related nonlinear optical (NLO) …
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On the theory of polarization-dependent two-photon absorption
… of an atom or molecule with more than one photon. The simplest; such multiphoton interaction is two-photon absorption by an atom. In this thesis, I develop a model of polarization-dependent two-photon absorption (PDTPA) as a generalization of the present scalar models of two-photon …
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Two-photon absorption and nonlinear polariton effects in organic crystals
<p>Two-photon excitation (TPE) and second harmonic generation (SHG) have been studied in phenanthrene crystals at low temperatures (2 to 6K) in order to investigate mechanisms of two-photon absorption (TPA), the relationship between TPE and SHG, and polariton effects. The transition studied is of …
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On the fundamental imaging-depth limit in two-photon microscopy
One of the principle advantages of two-photon microscopy over one-photon techniques is that it can provide high-resolution images from very deep within living tissue. While imaging depths of 500 micron in brain tissue have become standard performance, larger depths have been inaccessible mainly due …
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