Abstract-Focusing Performance of Terahertz Zone Plates with Integrated Cross-shape Apertures

• L. Minkevičius, 
• K. Madeikis, 
• B. Voisiat, 
• I. Kašalynas, 
• R. Venckevičius, 
• G. Račiukaitis, 
• V. Tamošiūnas, 
• G. Valušis

http://link.springer.com/article/10.1007/s10762-014-0086-8

Search of novel breakthrough concepts of room temperature compact terahertz (THz) imaging systems [1–3] remains as one of sensitive topics in THz photonics. As a rule, a particular attention is attributed to the development of compact THz sources and detectors, however, compact optic components – such as focusing lenses, mirrors, beam splitters, etc – as well plays important role in reducing size of the systems. Preferences here are usually given to inexpensive and relatively simple technology-based approaches, for instance, binary lenses [4], focusing elements of a combined design structures [5] or narrow-band laser-ablated filters [6]. These solutions can be found well-suited in THz heterodyne [7] and spectroscopic imaging [8] when only several specific spectral lines are used to record image, but still enabling to indentify an object under test. Very recently, terahertz zone plate with integrated resonant filters (TZP) was proposed and experimentally demonstrated for efficient radia.