Abstract-A Dynamically Reconfigurable Terahertz Array Antenna for Near-field Imaging Applications

Kathirvel Nallappan, Jingwen Li, Hichem Guerboukha, Andrey Markov, Branko Petrov, Denis Morris, Maksim Skorobogatiy

(Submitted on 30 May 2017)

https://arxiv.org/abs/1705.10624

A proof of concept for high speed near-field imaging with sub-wavelength resolution using SLM is presented. An 8 channel THz detector array antenna with an electrode gap of 100 um and length of 5 mm is fabricated using the commercially available GaAs semiconductor substrate. Each array antenna can be excited simultaneously by spatially reconfiguring the optical probe beam and the THz electric field can be recorded using 8 channel lock-in amplifiers. By scanning the probe beam along the length of the array antenna, a 2D image can be obtained with amplitude, phase and frequency information.

Abstract-Two-wire terahertz fibers with porous dielectric support

http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-21-10-12728

Andrey Markov and Maksim Skorobogatiy^*

Department of Engineering Physics, École Polytechnique de Montréal, Québec, Canada

^*Corresponding author: maksim.skorobogatiy@polymtl.ca

Abstract

A novel plasmonic THz fiber is described that features two metallic wires that are held in place by the porous dielectric cladding functioning as a mechanical support. This design is more convenient for practical applications than a classic two metal wire THz waveguide as it allows direct manipulations of the fiber without the risk of perturbing its core-guided mode. Not surprisingly, optical properties of such fibers are inferior to those of a classic two-wire waveguide due to the presence of lossy dielectric near an inter-wire gap. At the same time, composite fibers outperform porous fibers of the same geometry both in bandwidth of operation and in lower dispersion. Finally, by increasing cladding porosity one can consistently improve optical properties of the composite fibers.

© 2013 OSA

Abstract-Two-wire Terahertz Fibers with Porous Dielectric Support

                 (My note: These photographs are of work unrelated to this Abstract)

Andrey Markov and Maksim Skorobogatiy
http://eprintweb.org/S/article/physics/1303.2529
Abstract. A novel plasmonic THz fiber is described that features two metallic wires that are held in place by the porous dielectric cladding functioning as a mechanical support. This design is more convenient for practical applications than a classic two metal wire THz waveguide as it allows direct manipulations of the fiber without the risk of perturbing its core-guided mode. Not surprisingly, optical properties of such fibers are inferior to those of a classic two-wire waveguide due to the presence of lossy dielectric near an inter-wire gap. At the same time, composite fibers outperform porous fibers of the same geometry both in bandwidth of operation and in lower dispersion. Finally, by increasing cladding porosity one can consistently improve optical properties of the composite fibers