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Full-Text Articles in Physical Sciences and Mathematics
The Effect Of Electron-Hole Pairs In Semiconductor And Topological Insulator Nanostructures On Plasmon Resonances And Photon Polarizations., Hari Paudel
Electronic Theses and Dissertations
The generation of electron-hole pairs in materials has great importance. In direct bandgap semiconductor materials, the mechanism of radiative recombination of electron-hole pairs leads to the emission of photons, which is the basis of Light Emitting Diodes (LEDs). The excitation of electron-hole pairs by absorption of photons is the active process in photodiodes, solar cells, and other semiconductor photodetector devices. In optoelectronic devices such as optical switches which are based on transmission and reflection of the photons, electron-hole pairs excitation is a key for the device performance. Diodes and transistors are also great discoveries in electronics which rely on the …
Terahertz And Sub-Terahertz Tunable Resonant Detectors Based On Excitation Of Two Dimensional Plasmons In Ingaas/Inp Hemts, Esfahani, Nima Nader
Terahertz And Sub-Terahertz Tunable Resonant Detectors Based On Excitation Of Two Dimensional Plasmons In Ingaas/Inp Hemts, Esfahani, Nima Nader
Electronic Theses and Dissertations
Plasmons can be generated in the two dimensional electron gas (2DEG) of grating-gated high electron mobility transistors (HEMTs). The grating-gate serves dual purposes, namely to provide the required wavevector to compensate for the momentum mismatch between the free-space radiation and 2D-plasmons, and to tune the 2DEG sheet charge density. Since the plasmon frequency at a given wavevector depends on the sheet charge density, a gate bias can shift the plasmon resonance. In some cases, plasmon generation results in a resonant change in channel conductance which allows a properly designed grating-gated HEMT to be used as a voltage-tunable resonant detector or …
Cascaded Plasmon Resonances For Enhanced Nonlinear Optical Response, Seyfollah Toroghi
Cascaded Plasmon Resonances For Enhanced Nonlinear Optical Response, Seyfollah Toroghi
Electronic Theses and Dissertations
The continued development of integrated photonic devices requires low-power, small volume all-optical modulators. The weak nonlinear optical response of conventional optical materials requires the use of high intensities and large interaction volumes in order to achieve significant light modulation, hindering the miniaturization of all-optical switches and the development of lightweight transmission optics with nonlinear optical response. These challenges may be addressed using plasmonic nanostructures due to their unique ability to confine and enhance electric fields in sub-wavelength volumes. The ultrafast nonlinear response of free electrons in such plasmonic structures and the fast thermal nonlinear optical response of metal nanoparticles, as …