Sökning: "near-field optics"
Visar resultat 1 - 5 av 15 avhandlingar innehållade orden near-field optics.
1. Near-Field Radiative Heat Transfer between Plasmonic Nanostructures
Sammanfattning : Radiative heat transfer (RHT) due to coupled electromagnetic near field scan significantly exceed that dictated by Planck’s law. Understanding such phenomenon is not only of fundamental scientific interest, but also relevant to a broad range of applications especially connected to nanotechnologies. LÄS MER
2. Photonic terahertz-wave generation, radiation and quasioptical integration
Sammanfattning : This thesis deals with the uni-travelling-carrier photodiode (UTC-PD) based photonic generation of terahertz waves, antenna designs for the terahertz radiation and a novelcatadioptric lens for quasioptical integration.The ongoing and accomplished research work on the UTC-PD, its limitations and optimisation scopes for attaining higher bandwidth and higher output power have been discussed. LÄS MER
3. Optical properties and degradation of deep ultraviolet AIGaN-based light-emitting diodes
Sammanfattning : .... LÄS MER
4. Localization effects in ternary nitride semiconductors
Sammanfattning : InGaN based blue and near-ultraviolet light emitting diodes and laser diodes have been successfully commercialized for many applications such as general lighting, display backlighting and high density optical storage devices. Despite having a comparably high defect density, these devices are known for their efficient operation, which is attributed to localization in potential fluctuations preventing carriers from reaching the centers of nonradiative recombination. LÄS MER
5. Designer magnetoplasmonics for adaptive nano-optics
Sammanfattning : Materials that provide real-time control of the fundamental properties of light at visible and near-infrared frequencies enable the essential components for future optical devices. Metal nanostructures that couple electromagnetic (EM) radiation on a sub-wavelength length scale to free electrons, forming propagating or localized surface plasmons, provide many exciting functionalities due to their ability to manipulate light via the local EM field shaping and enhancement. LÄS MER