The interaction between intersubband resonances (ISRs) and metamaterial microcavities can form a strongly coupled system where new resonances form that depend on the coupling strength. Here we ...present experimental evidence of strong coupling between the cavity resonance of a THz metamaterial and the ISR in a high electron mobility transistor structure with a triangular confinement. The device is electrically switched from an uncoupled to a strongly coupled regime by tuning the ISR with epitaxially grown transparent gates. An asymmetric triangular potential in the heterostructure enables ultrawide electrical tuning of ISR which is an order of magnitude higher as compared to the equivalent square well. For a single triangular well, we achieve a coupling strength of 0.52 THz, with a normalized coupling ratio of 0.26.
Doping of substrates at desired locations is a key technology for spin-based quantum memory devices. Focused ion beam implantation is well-suited for this task due to its high spacial resolution. In ...this work, we investigate ion-beam implanted erbium ensembles in Yttrium Orthosilicate crystals by means of confocal photoluminescence spectroscopy. The sample temperature and the post-implantation annealing step strongly reverberate in the properties of the implanted ions. We find that hot implantation leads to a higher activation rate of the ions. At high enough fluences, the relation between the fluence and final concentration of ions becomes non-linear. Two models are developed explaining the observed behaviour.
In the epithelial cell line of Chironomus tentans growth ceases after addition of 20-hydroxyecdysone. Under the influence of moulting hormone the protein pattern changes as shown by 2-dimensional ...electrophoresis and silver staining. Incorporation of 35S-labelled methionine reveals qualitative and quantitative changes in the homogenate from the cells and in the proteins secreted into the medium. RNA from cells treated with 20-OH-ecdysone for various times either permanently or with pulses of moulting hormones was expressed in a reticulocyte in vitro translation system. Qualitative changes in the in vitro translated products were first observed after 75 min and continue until day 4 after hormone treatment. A complex pattern of permanent and transient induction and repression of different transcripts is obtained.
