Formålet med Nano II er at gøre dig istand til følgende:
(Nanosystemers teori og funktion) - gøre rede for teori bagved og funktion af "top-down"-fabrikerede nanosystemer - beregne nøgleparametre og egenskaber baseret på konkrete dimensioner og materialer
Omkring Nanosystems Engineering - Gøre rede for kritiske aspekter ved design, modellering, materialer, fabrikation, integration og karakterisering af "topdown" nanosystemer - Vurdere materialevalg, fabrikationsmetoder og integrations metoder i simple tilfælde.
Stoffet er tilrettelagt i fire applitionsrettede cases, der hver løber over 3 uger, og som hver slutter med en evalueringsopgave. Disse er beskrevet nedenfor.
Kursusindhold:
Case 1 deals with nano-electromechanical systems (NEMS). Special focus will be on the cantilever mass sensor, which detects mass by means of nanoscale resonators; the resonance frequency decrease sligthly when a particle attach to the resonator and this can be translated into a mass change. Using top-down silicon-based fabrication of nanostructures, the size of such a resonator is reduced to nanoscale, which makes the sensitivity approach single molecule detection.
Case 2 is about devices based on nanowires or nanotubes used as mechanical and electrical components. We consider mainly two types of devices: a chemical sensor based on a silicon nanowire, and an atomic force cantilever with a supersharp carbon nanotube tip. We look into the physical (electrical, mechanical, structural) properties of the structures, how they are synthesised, and the problem of integrating ready-made nanocomponents in microfabricated structures to form working nanosystems.
Case 3 introduces briefly the electrodynamics and fundamental material types important for nanooptics. Techniques for characterising nanooptical properties such as terahertz spectroscopy and Raman spectroscopy will be discussed. You will choose between several practical experiments involving nanooptical phenomena for hands-on experience. You will get a first insight into the processes governing the optical properties on a nanoscale and learn about a few of the new and important applications.
Case 4 focus on the electronic properties of scaled-down structures. Using an advanced nanofabrication technique called epitaxial growth, semiconductor nanowires can be synthesised with near-atomic precision. This allows integration of p-n diodes and superlattices in a single nanowire. Key phenomenae such as size-quantization of conductance in 1D conductors and Coulomb blockade in 0D electron systems, as well as resonant tunelling will be introduced, in relation to nanoengineered devices and their possible applications.
Litteratur::
Kurset er baseret på noter, suppleret med videnskabelige artikler og lærebogsafsnit der vil blive udleveret på kursets første dag, mod dækning af kopieringsudgifter.
