Modal characteristics of antiresonant reflecting pipe waveguides for terahertz waveguiding

Abstract

Modal characteristics of the THz pipe waveguide, which is a thin pipe consisting of a large air core and a thin dielectric layer with uniform but low index, are investigated. Modal indices and attenuation constants are calculated for various core diameters, cladding thicknesses, and cladding refractive indices. Numerical results reveal that the guiding mechanism of the leaky core modes, which transmit most of the power in the air-core region, is that of the antiresonant reflecting guiding. Moreover, modal patterns including modal intensity distributions and electric field vector distributions are shown for the fundamental and higher order modes. Experiments using time-domain spectroscopy with PMMA pipes also confirm the antiresonant reflecting guiding mechanism.

Infrared fibers

“…The major motivation behind these studies is the applications of these waveguides in integrated photonics, sensing, and quantum communications. Similar simple design strategies were applied to cylindrical waveguides (fibers) consisting of high-index inclusions that surround a low-index core, either to integrate them with existing fiber infrastructures or to extend the transmission to longer wavelengths into the MIR and THz region both theoretically and experimentally [434][435][436][437][438][439][440][441][442][443]. The demonstration of high-average-power picosecond and nanosecond pulse delivery at the NIR (1030 and 1064 nm, respectively) region [444] and MIR (2.94 μm) [54] through hollow-core AR fibers proves the potential for applications in micromachining and surgical devices.…”

Metal plate for guiding terahertz surface plasmon-polaritons and its sensing applications

“…Since they are first proposed, there are many similar THz waveguides [4][5][6][7] have been studied, and many interesting theoretical and experimental conclusions have been given. THz waveguides have been widely used in communications, spectroscopy, imaging, detection and sensing [8][9][10][11].…”

THz wave transmission within the metal film coated double-dielectric-slab waveguides and the tunable filter application

“…In recent years, THz waveguides [1][2][3] have been widely studied, such as metal wire waveguides [4][5][6], dielectric pipe waveguides [7][8][9][10], ultra-thin metal pipe waveguides [11]. Since they are first proposed, various applications of them have been studied and reported, such as transmission, sensing [12,13], filtering.…”