Fabrizio Raphael Giorgetta

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We review our recent progress on the fabrication of near-infrared photodetectors based on intersubband transitions in AlN/GaN superlattice structures. Such devices were first demonstrated in 2003, and have since then seen a quite substantial development both in terms of detector responsivity and high speed operation. Nowadays, the most impressive results(More)
The instantaneous optical frequency of an external-cavity quantum cascade laser (QCL) is characterized by comparison to a near-infrared frequency comb. Fluctuations in the instantaneous optical frequency are analyzed to determine the frequency-noise power spectral density for the external-cavity QCL both during fixed-wavelength and swept-wavelength(More)
Dual, coherent frequency combs are used to measure the spectrum of an incoherent, quasi-thermal source through Fourier spectroscopy. The source spectrum is acquired over 1 THz bandwidth with an absolute frequency accuracy set by the combs. Work of the U.S. government, not subject to copyright.
This review covers the physics, epitaxial growth, fabrication, and characterization of optoelectronic devices for use in video players and other consumer electronics as well as in commercial systems. ABSTRACT | We report on the physics, epitaxial growth, fabrication, and characterization of optoelectronic devices based on intersubband transitions in the(More)