It is demonstrated that standard concepts for optics like Fabry–Pérot resonances and antireflection coatings can be extended to ballistic electron transport in semiconductor superlattices. The transmission through a superlattice miniband is increased by a factor of 2.4 if two further barriers are added at both sides of the structure. The condition for Fabry–Pérot resonances for Bloch states in finite periodic potentials is derived and experimental evidence for their existence is obtained in transport experiments.

The growth of optical layers of SiO2 and Nb2O5 on amorphous substrates is investigated. We develop a kinetic Monte Carlo model which mimics the amorphous structure by randomly fluctuating binding energies. The resulting surface profiles are characterized by their root-mean-square roughness, height–height correlation functions, and growth exponents. For strong random fluctuations, the growth exponents exceed the value of 0.5, in good agreement with experiment.

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PACS 61.43. Er, 68.35.Ct, 68.55.Ac Amorphous SiO 2 and Nb 2 O 5 thin-film growth simulations are performed on the basis of a solid-on-solid model considering fluctuating effective atom binding energies. We show that by assuming laterally correlated random energy fluctuations, one can obtain effective growth exponents and overall film roughness in agreement with experimental results. The solid-on-solid model is solved by event-based kinetic Monte Carlo simulations and the obtained results are compared to atomic force microscopy data.