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– The introduction of the concept of parity-time symmetry in optics, inspired by recent theoretical developments in quantum mechanics and quantum-field theories, is revolutionizing our ability to design and manufacturing synthetic optical materials and photonic devices for molding the flow of light at the microand nano-scale, with novel functionalities impossible with ordinary materials and with important applications in the fields of laser technologies, integrated photonics and sensor technology. In this note I will illustrate the basic theoretical grounds of optical materials with paritytime symmetry and I will present the main recent applications to photonic technologies. 1. INTRODUZIONE E MOTIVAZIONI Il concetto di simmetria è fondamentale in molti ambiti della scienza, ed ha attratto grande interesse fin dall’antichità da parte di (*) Dipartimento di Fisica, Politecnico di Milano, Milano, Italia. E-mail: stefano.longhi@polimi.it Istituto Lombardo (Rend. Scienze) 150, 221-237 (2016) Fisica

SIMMETRIA PARITÃ€-TEMPO IN OTTICA: VERSO UNA NUOVA INGEGNERIA DELLA LUCE