Gaetano Scamarcio
University of Bari, Italy
Title: Optical feedback interferometry in quantum cascade lasers
Biography
Biography: Gaetano Scamarcio
Abstract
After reviewing the features of self-mixing interferometry in quantum cascade lasers, its inherent ultra-stabilkity and its several metrological applications, I will present our recent results on a novel contact-free method based on the use of THz quantum cascade lasers operating under optical feedback to image in reflection mode the free electron plasma photogenerated onto a semiconductor surface. Self-mixing interferometry is also used to demonstrate the possibility to produce sub-wavelength patterns acting as metamaterials in semiconductors pumped by a spatially modulated near-infrared beam.