Wednesday, October 14, 2015
Abstract-On-chip integration solutions of compact optics and detectors in room-temperature terahertz imaging systems
Linas Minkevičius; Vincas Tamošiūnas; Irmantas Kašalynas; Rimvydas Venckevičius; Karolis Madeikis; Bogdan Voisiat; Dalius Seliuta; Gediminas Račiukaitis; Gintaras Valušis
On-chip integrated solutions employing properties of Fresnel zone plates with integrated band-pass filters for the room temperature terahertz imaging systems are discussed. Finite-difference time-domain simulations were used to predict properties of conventional zone plates and ones with resonant filter areas as flat optics components. They are produced employing the laser direct writing and characterized by electronic THz sources and an optically pumped terahertz laser. It was shown that more than one order of magnitude detection enhancement can be observed of bow-tie-shaped InGaAs-based terahertz detectors by on-chip incorporation of the secondary diffractive optics.