From Event: SPIE Optical Engineering + Applications, 2017
Convenience in use of room-temperature terahertz (THz) imaging systems, reduction of their dimensions and presence of on-chip solutions remains one of prime interests for direct implementation aims. Solid-state-based solutions in miniaturization of spectroscopic THz imaging systems including novel semiconductor nanostructures bias-free emitters, diffractive THz optics components and their on-chip integration with THz detectors are discussed. In particular, pulsed optoelectronic terahertz emitter based on a δ-doped p-i-n-i GaAs/AlxGa1−xAs heterostructure was studied and it is demonstrated that the heterostructure can serve as efficient antenna- and bias-free surface emitter. Diffractive optics elements – Fresnel zone plates –with integrated band-pass filters were simulated employing Finite-difference time domain method. Structures were fabricated using the laser direct writing and investigated using electronic THz sources and an optically pumped terahertz laser. Advantages of on-chip integration of diffractive optics and bow-tie-shaped InGaAs-based terahertz detectors are revealed via detection enhancement. Bow-tie diodes properties in frequency scale and detection sensitivity are considered and compared for different materials. Homodyne detection and imaging of low-absorbing objects at 0.6 THz are demonstrated and discussed.
Rimvydas Venckevičius, Linas Minkevičius, Antanas Reklaitis, Vincas Tamošiūnas, Irmantas Kašalynas, Domas Jokubauskis, Dalius Seliuta, Bogdan Voisiat, Gediminas Račiukaitis, and Gintaras Valušis, "Compact solutions for spectroscopic solid-state-based terahertz imaging systems," Proc. SPIE 10383, Terahertz Emitters, Receivers, and Applications VIII, 103830S (Presented at SPIE Optical Engineering + Applications: August 07, 2017; Published: 23 August 2017); https://doi.org/10.1117/12.2273353.
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