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Showing 1 to 20 of 22 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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High speed nonlinear optical components for next-generation optical communications
… such as semiconductor optical amplifiers (SOAs), electroabsorption modulators (EAMs) and silicon nanowires are the most promising candidates as all-optical switching elements vis-à-vis ease of integration, device footprint and energy consumption. This PhD thesis presents the amplitude and phase …
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