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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 24 for “"electroabsorption"”.
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Electroabsorption spectroscopy of quasi-one-dimensional organic molecular crystals
… a thorough experimental investigation of electroabsorption spectroscopy on quasi-one-dimensional organic molecular crystals such as PTCDA and MePTCDI vapor deposited thin films to clarify the involvement of the charge-transfer exciton in the lowest excited state. By a self-built …
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Electroabsorption effects near the direct and indirect edges of germanium
… edge of germanium was measured, employing a-c electroabsorption techniques, from 14 to 3000K with electric fields varying from 5 x 103 V/cm to 5 x 104 V/cm. The curves of the fieldinduced differential absorption coefficient Aa exhibit oscillations which, in the case of the direct edge spectrum, …
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Application of electroabsorption in a semiconductor laser for electromagnetic field sensing
The application of electroabsorption in an AlGaAs quantum-well semiconductor laser device for optically based electromagnetic field sensing has been studied. A separate confinement heterostructure laser design containing a single quantum well and a steplike waveguiding index profile has …
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Ge and GeSi electroabsorption modulator arrays via strain and composition engineering
… for telecommunications and sensing applications. Electroabsorption modulators allow fast modulation, small device footprint, and low power consumption. Epitaxially grown GeSi films on SOI substrates are a suitable materials platform for integrated modulator applications. A modulator's operation …
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Ultrafast carrier dynamics and enhanced electroabsorption in (gallium,indium)arsenide/(aluminum,indium)arsenide asymmetric double quantum well structures
… fast hole transfer between the wells. Enhanced electroabsorption in selectively doped (Ga,In)As/(Al,In)As ADQWs by the use of real space electron transfer is demonstrated. The electron concentration in both the WW and NW is investigated by field-dependent absorption and photoluminescence …
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Studies in Solid-State Physics: One: Critical Effects in Dysprosium and Rubidium-Silver-Iodide, Two: Electroabsorption by Layered Semiconductors
Made available in DSpace on 2015-05-13T15:21:57Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7606837.PDF: 5003404 bytes, checksum: 921744fb4a7205c359a3a9b5a9dd0542 (MD5) Previous issue date: 1975
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Topics in the theory of condensed matter: Diffusion thermoelectric power in the alkali metals and electroabsorption by acoustoelectric domains
Submitted by William Weathers (weathrs2@illinois.edu) on 2012-04-22T17:59:42Z No. of bitstreams: 1 1975_bowen.pdf: 6073117 bytes, checksum: b76f43545cc5db31950e33fee42769a0 (MD5)
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Studies in solid state physics: One: Critical effects in dysprosium and rubidium silver iodide, Two: Electroabsorption by layered semiconductors
Submitted by William Weathers (weathrs2@illinois.edu) on 2012-04-22T20:07:47Z No. of bitstreams: 1 1975_lederman.pdf: 5513194 bytes, checksum: b7d15a36a1a80ef5d5235474d6c21720 (MD5)
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Studies of the Optical Properties of Solids: I. Two-Photon Electroabsorption. Ii. Electron-Hole Exchange Coupling at L(ii,iii) Edges
Made available in DSpace on 2015-05-13T15:22:11Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7811257.PDF: 4043940 bytes, checksum: b20d8efbc87445f7b5e2bca6f9697a32 (MD5) Previous issue date: 1978
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Temperature and Spatial Hole Burning Effects in Semiconductor Lasers and Integrated Optical Devices
… (DFB) lasers, and integrated electroabsorption modulator with DFB lasers (EML). First, the temperature dependence of bulk InGaAsP semiconductor laser diodes is analyzed using a consistent method involving gain and spontaneous emission measurements to isolate the …
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Optical properties of confined and unconfined excitons in semiconductor quantum heterostructures
… These techniques are applied to calculate the electroabsorption, resonant Raman scattering in GaAs quantum wells, and absorption of above barrier excitons in both type I and type II heterostructures. We find that the valence band mixing is important in explaining the fine structures in the …
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Germanium-rich silicon-germanium materials for field-effect modular application
… the design of silicon-germanium (SixGe1-x) electroabsorption and phase modulators at 1.55 pLm wavelength from the Franz-Keldysh model. The composition optimized for electroabsorption and phase modulator applications is SixGe1-x with a value of x~0.075 and 0.135, respectively. To achieve …
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Design and Characterization of Integrated Photonic Devices Fabricated Using Selective-Area Epitaxy and Distributed Bragg Reflector Surface Gratings
… with monolithically integrated external cavity electroabsorption (EA) modulators without modification of the active region.
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Characteristics of semiconductor optical waveguides fabricated by impurity-induced layer disordering
… electro-optic modulation and detection. This electroabsorption effect produced a change of over 100 cm$\sp{-1}$ in the modal absorption coefficient with less than a volt change in bias. Based on these findings, the feasibility of using a single heterostructure for the integration of multiple …
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High-Speed Modulation of Semiconductor Lasers and Modulators
… laser system. Second, we investigate integrated electroabsorption modulator-lasers. They are more compact and have very good high-speed performance. We study injection locking using these integrated devices, presenting a novel data acquisition method by directly measuring the modulator section …
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Ultrafast Broadband Terahertz Spectroscopy
… of the fourth section is terahertz imaging with electroabsorption. Optically biased coherent detection is distinguished from air-breakdown coherent detection by replacing the electrical bias for an optical field. The importance of phase control in this technique is demonstrated. In addition, we …
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Functional heterointerfaces via electromodulation spectroscopy
… interfacial electronic structures, by performing electroabsorption (EA) measurements at reduced temperatures. We showed in this thesis that low-temperature EA spectroscopy is a surface sensitive technique that can determine the interface electronic structures in electrode/polymer …
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Efficiency loss mechanisms in colloidal quantum-dot light-emitting diodes
… of nearly 50%. We complement the ELPL study with electroabsorption spectroscopy measurements of a biased QD-LED, which confirms that the charging of the QDs is not voltage bias dependent and is thus unrelated to the roll-off. Finally, we study the effect of Auger recombination on QD-LEDs by …
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All optical networking beyond 10 Gbits/s OTDM networks based on electro-optic modulators and fibre ring lasers
… of the performance of Mach Zehnder and electroabsorption modulators support the design criteria that are established for the construction of simple optical time division multiplexed systems. Having established appropriate end terminals for an optical network, the thesis examines …
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