CREOL: CROL-103 | and Virtual Title: Nonlinear Intersubband Polaritonic Metasurfaces: from second-harmonic generation with beam shaping to widely-tunable THz sources Abstract: Quantum-engineered intersubband transitions in n-doped multiple-quantum-well heterostructures allow one to produce semiconductor films with very large nonlinear optical response. This nonlinear response can be further enhanced by processing semiconductor heterostructures as metasurfaces in which intersubband transitions are coupled to optical modes of the metasurface …