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Achieving a strong nonlinear response in the microwave to far-infrared spectral ranges is important for the development of GHz-THz technologies e.g. for noninvasive screening medical applications. Nonlinearities in semiconductors are well understood in near infrared and visible ranges, but little is known about the nonlinear response in the GHz and THz regime. Our aim is to deliver a state of the art simulator of intersubband transport and optical response of superlattices, based on Nonequilibrium Green’s Functions calculations, coupled with exact solutions of the corresponding Boltzmann equation. This will enable us to design structures with large nonlinear response controlled by external parameters. Prospective structures will be fabricated by Molecular Beam Epitaxy and characterized using spectroscopic and electrical measurements, thus providing a feedback for the simulator development. We will gain a deep understanding of microscopic phenomena underlying the nonlinearities and provide guidelines for designing components with application potential, such as frequency multipliers.
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