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 33 for “"optical modulation"”.
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Surface acoustic wave optical modulation
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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Optical modulation of harmonics in PIN photodiodes for antenna applications
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-12-01
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Dynamically programmable surfaces for high-speed optical modulation and detection
… optoelectronic technologies including high-speed optical communication, display and projection, autonomous driving, optical information processing, imaging, and fast programmable optical tweezers. Currently available electro-optically tunable components are often bulky, inefficient, and have …
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High-speed characterizations of single quantum-well transistor laser
… characterizations on TLs and data of the optical modulation bandwidth, f-3dB, and error-free data transmission.
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Doped tungsten oxide nanocrystals for next generation electrochromic windows
… electrochromic performance of switching speed, optical modulation, and cycling stability. This work illustrates how doped WO₃ [subscript -x] NC properties are effectively utilized for enhancing the electrochromic performance. First, how shape anisotropic properties can generate highly porous …
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Advanced light manipulation and waveguiding in plasmonic nanostructured optical fibers.
Conventional optical fibers are well-known for their efficient light guiding mechanism. However, the dielectric properties of core and cladding materials (e.g.- doped silica and silica glasses) limit the functionality of the optical fibers. Therefore, the optical properties of the fibers, such as …
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Opto-Electronic Modulation of Quantum Dots by Cells and Bioactive Molecules
… core/shell QDs, spectroscopic analysis of optically excited colloidal QDs with HL60, K562, and T98G cell lines are performed. Our results show statistically significant (p < 0.001 and p < 0.0001) quenching of the emission spectra of the colloidal dispersions due to bioactive molecules in …
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Optical properties of GaAs coupled quantum wells and superlattices: electric and magnetic field effects
… effects of electric and magnetic fields on the optical transmission and reflection spectra of GaAs/ AlGaAs coupled quantum wells and superlattices are investigated and their potential application in optical modulation demonstrated. Quenching and enhancement of excitonic absorption peaks is …
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High-Speed Modulation of Semiconductor Lasers and Modulators
… laser sources are critical components in optical communications systems and are presently the subject of intense research efforts. We present a comprehensive study of different modulation schemes. First, modulation schemes on a single semiconductor laser are investigated and compared for …
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Monolithic electronic-photonic integration of the light-emitting transistor
… for bandwidth, energy efficient and reliable optical interconnects. The development of an optical communication solution is broadened from the initial optical interconnect from server rack-to-rack solution to intra-chip connection. The light-emitting transistor (LET) has good potential as an …
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A new compound modulation technique for multi-channel analog video transmission on fiber
Present analog optical fiber multi-channel video transmission systems are very sensitive to laser nonlinearities and are consequently limited in the optical modulation depth (OMD) that may be used. This, in turn limits the power budget achievable, signal-to-noise ratio, and the channel capacity. In …
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Independent two-color optogenetic excitation of neural populations
The optical modulation of neurons with channelrhodopsins, a class of genetically encoded light-gated ion channels, has enabled the spatiotemporally precise interrogation of the roles individual cell types play in neural circuit dynamics. A topic of great interest to the neuroscience community is …
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Temperature-Dependent High-Speed Modulation and Wavelength Conversion Using Quantum-Well Lasers
… effects that determine the high-speed modulation response and wavelength conversion in long-wavelength semiconductor lasers is presented. The steady-state measurement of gain is presented through four different approaches, including the direct (Hakki-Paoli) measurement of …
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Germanium-rich silicon-germanium materials for field-effect modular application
The development of electric-field-induced optical modulation in the materials capable of monolithically integrated on silicon (Si) substrates offer the possibility of high-speed modulation in a pico second timeframe as well as low power consumption, key requirements for integrated modulator …
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Applications modelling of advanced multilayer semiconductor structures - The bulk unipolar devices
… photodetector where the internal gain is due to optical modulation of the potential barrier inside the bulk material via the diffusion and thermionic emission theories for the first time. Qualitative analysis of how optically generated holes in the vicinity of the p t-plane have the effect of …
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Chalcogenide Glass on Layered van der Waals Crystals for Integrated Photonic Devices
… photonic devices with their varied and tunable optical properties. They can be integrated into planar photonic devices on virtually any substrate due to their van der Waals bonding, thereby introducing desirable material properties to existing integrated photonic platforms. Previously, their …
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Investigating the interfacial process and bulk electrode chemistry in tungsten oxide electrochromic materials
… color heterogeneity. The Coulombic efficiency, optical modulation, apparent diffusion coefficients, and switching kinetics are gradually diminished during 3,000 cyclic voltammetry cycles, resulting from the structural and chemical changes of the WO3 electrode. We hypothesize that the high …
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Electro-optic polymer-based monolithic waveguide devices with multi-functions of amplification switching and modulation
… the capability of amplification and modulation. Complete device-fabrication processes, including wafer preparing, polymer coating and curing, adhesion enhancing of film interfaces, waveguide RIE etching, electrode patterning and plating, wafer dicing, waveguide polishing, and wire …
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Controlling light on the nanoscale: ultrafast plasmonics and phase change functionality
… waveguide is achieved. The ultrafast optical modulation of plasmons is accomplished by optical excitation of the aluminium plasmonic waveguide using 200 fs optical pulses at wavelengths near the aluminium’s interband absorption resonance (lambda ~ 800 nm). The demonstrated modulation …
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