Journal ArticleDOI
Modes in silver-iodide-lined hollow metallic waveguides mapped by terahertz near-field time-domain microscopy
Miguel Navarro-Cia,Carlos M. Bledt,Miriam S. Vitiello,Harvey E. Beere,David A. Ritchie,James A. Harrington,Oleg Mitrofanov +6 more
TLDR
In this paper, the effect of 1 μm thick silver iodide (AgI) coatings on the fundamental modes in cylindrical waveguides at terahertz (THz) frequencies, in the regime of the dielectric layer being thinner than the optimal thickness hopt� 2 THz� ≈ 20 μm.Abstract:
Thin dielectric layers inside hollow metallic waveguides are used to improve the waveguide transmission characteristics as the dominant waveguide mode changes into the hybrid HE11 mode. We investigate the effect of 1 μm thick silver iodide (AgI) coatings on the fundamental modes in cylindrical waveguides at terahertz (THz) frequencies, in the regime of the dielectric layer being thinner than the optimal thickness hopt� 2 THz� ≈ 20 μm. In the region of 1–3.2 THz, the lowest-order modes are similar in profile to the TE11 and TM11 modes, as determined by the timeresolved near-field measurements and verified numerically. Higher-order modes are detected experimentally as mode mixtures due to the multimode propagation. Numerical electromagnetic modeling is applied to resolve the mode structure ambiguity, allowing us to correlate experimentally detected patterns with a superposition of the TM11 and the higher-order mode, TE12. Mode profiles determined here indicate that in the regime of ultrathin dielectric (h ≪ 0.1λeff), the dielectric layer does not transform the dominant mode into the low-loss HE11 mode. Experimental mode patterns similar to the HE11 and the TE01 modes nevertheless can be formed due to mode beating. The results indicate that the Ag/AgI waveguides can be used for guiding THz waves in the TE01 mode or the TE12 mode with high discrimination against other modes. © 2012 Optical Society of America OCIS codes: 110.6795, 180.4243, 320.7100.read more
Citations
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Journal ArticleDOI
Terahertz wave transmission in flexible polystyrene-lined hollow metallic waveguides for the 2.5-5 THz band.
Miguel Navarro-Cia,Miriam S. Vitiello,Carlos M. Bledt,Jeffrey E. Melzer,James A. Harrington,Oleg Mitrofanov +5 more
TL;DR: Numerical modeling reproduces the measured absorption spectrum but underestimates the losses at the absorption peak, suggesting imperfections in the waveguide walls and that the losses can be reduced further.
Journal ArticleDOI
3 μm aperture probes for near-field terahertz transmission microscopy
TL;DR: In this paper, the authors observed that the transmitted evanescent field within 1'μm of the aperture deviates significantly from the Bethe dependence of E'∝'a 3.
Journal ArticleDOI
Specialty Fibers for Terahertz Generation and Transmission: A Review
TL;DR: In this article, the progress and current status of optical fiber-based techniques for terahertz (THz) generation and transmission are reviewed, and the use of optical fibers for THz application has attracted considerable attention in recent years.
Journal ArticleDOI
Silver-Coated Teflon Tubes for Waveguiding at 1-2 THz
TL;DR: In this article, the authors investigate dielectric-lined hollow metallic waveguides fabricated by coating 1mm diameter 38-μm-thick polytetrafluoroethylene tubes with silver.
Journal ArticleDOI
Elliptical metallic hollow fiber inner-coated with non-uniform dielectric layer
TL;DR: Results show that a dielectric layer with thickness less than λ/10 can effectively decreases the power distributed on the metal surface and thus can practically reduce loss resulting from roughness of the silver layer.
References
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Journal ArticleDOI
Hollow metallic and dielectric waveguides for long distance optical transmission and lasers
TL;DR: In this paper, the field configurations and propagation constants of a hollow circular waveguide made of dielectric material or metal for application as an optical waveguide were determined and the increase of attenuation due to curvature of the axis was also determined.
Journal ArticleDOI
Design theory of dielectric-coated circular metallic waveguides for infrared transmission
TL;DR: In this paper, a circular metallic hollow waveguide with inner dielectric multilayers was designed with the emphasis on low-loss transmission of the HE 11 mode for the infrared.
Book
Millimeter Wave Engineering and Applications
Prakash Bhartia,Inder J. Bahl +1 more
TL;DR: In this paper, the advantages and disadvantages of millimeter wave systems and components as compared to microwaves and optical frequencies; the characteristics of different types of generation devices; and the attenuation characteristics of gases, clouds, rain snow, and other environmental conditions.
Journal ArticleDOI
Silver/polystyrene-coated hollow glass waveguides for the transmission of terahertz radiation.
TL;DR: It is found that TE modes are supported in HGWs with thin PS films, while hybrid (HE) modes dominate when PS film thickness increases, and the lowest losses are obtained for the thicker PS films and the propagation of the HE modes.