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Cathodoluminescence of gallium nitride /Campo, Eva M., January 2003 (has links)
Thesis (Ph. D.)--Lehigh University, 2003. / Includes bibliographical references and vita.
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Growth and characterization of GaAsN compound semiconductors /Yun, Henry K. January 2001 (has links)
Thesis (Ph. D.)--University of Washington, 2001. / Vita. Includes bibliographical references (leaves 163-168).
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Point defects in III-nitrides studied by optical detection of magnetic resonance /Bozdog, Cornel, January 2001 (has links)
Thesis (Ph. D.)--Lehigh University, 2001. / Includes bibliographical references and vita.
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Investigation of AlGaN films and nickel/AlGaN Schottky diodes using depth-dependent cathodoluminescence spectroscopy and secondary ion mass spectrometryBradley, Shawn Todd, January 2004 (has links)
Thesis (Ph. D.)--Ohio State University, 2004. / Title from first page of PDF file. Document formatted into pages; contains xxii, 182 p.; also includes graphics (some col.). Includes abstract and vita. Advisor: Leonard J. Brillson, Dept. of Electrical Engineering. Includes bibliographical references (p. 173-182).
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Gallium arsenide based MBE-grown quantum structures for near infrared wavelength applicationsGovindaraju, Sridhar. January 2002 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2002. / Vita. Includes bibliographical references. Available also from UMI Company.
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GaN-based free-standing microdisks and nanostructuresZhang, Xuhui, 張旭輝 January 2014 (has links)
In this thesis, various micro- and nano-structures, fabricated by micro- and nanosphere lithography (NSL), were applied onto gallium nitride (GaN) based direct-bandgap semiconductors to develop optical micro-cavities supporting whispering gallery mode (WGM) lasing action. This work includes three major sections. The first section introduces the novel nanostructures patterned by NSL and discusses their characterization. The second section elaborates the free-standing microdisk (FSD) cavities supporting WGM lasing. Last section provides an effective approach for optimizing FSD system by replacing the interface layer.
Novel nanostructures for various applications are fabricated by NSL. First we developed and demonstrated a drop-on-demand method for fabricating twodimensional (2D) photonic crystal (PhC) arrays. Different geometries, such as nano-pillar and nano-cone, were obtained with variant etching parameters. The GaN PhCs comprising nano-pillar array with diameter of 200 nm were fabricated by different nano-patterning methods, NSL, focused ion beam lithography (FIB), and E-beam lithography (EBL). The surface morphologies and optical properties of fabricated structures were evaluated by various characterization techniques, including scanning electron microscopy (SEM), photoluminescence (PL) spectroscopy, and transmission measurement. The NSL technique is regarded as a preferable approach in fabricating nanostructures.
The FSD systems with diverse diameters of 1, 2, and 7 μm were prepared by laser lift-off (LLO) and microsphere lithography (MSL). The FSDs showed vertical and smooth sidewalls as confirmed by SEM images and served as an outstanding microcavities supporting WGM lasing. Optically pumped WGM lasing was obtained at room temperature for FSD systems. The lasing characteristics were fully studies. The thresholds were determined from the plots of PL peak intensity versus pumping energy density and the values were 5.01, 8.54, and 9.06 mJ/cm2 for FSDs with diameter of 1, 2, and 7 μm respectively. The remarkable quality (Q) factor of 2576 was achieved from 1 μm FSD. Anlysis for different thresholds and Q-factors were also discussed. By decreasing the FSD size, the number of lasing peaks is reduced to achieve single mode lasing due to the shrinkage of microdisk providing relatively large mode spacing.
An elegant approach was conducted to improve the optical confinement in FSD system in the last section. The beneath layer, originally ITO, was replaced by a reflecting metallic Ni/Ag layer. The SEM images revealed that a thin FSD standing on metallic supporting layer was successfully fabricated. The WGM lasing was also obtained through optical pumping. Lasing mode centered at 430.0 nm has a threshold of 8.82 mJ/cm2 and a Q-factor of 1673. The free space range (FSR) was determined to be 3 nm. A comparison between FSD system with ITO layer and the one with NiAg layer indicated that the metallic layer can server as a reflecting layer and improved the optical confinement of the system. / published_or_final_version / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy
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Studies of Ga vacancy related defects in GaSbMui, Wing-ki., 梅詠琪. January 2002 (has links)
published_or_final_version / Physics / Master / Master of Philosophy
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Nanoscale electrical characterization of gallium nitrideZhu, Tongtong January 2011 (has links)
No description available.
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The mechanism of luminescence in III-nitridesGaltrey, Mark John January 2010 (has links)
No description available.
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Fabrication and investigation of GaAsP light emitting diodesSalzman, James Donald, 1931- January 1972 (has links)
No description available.
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