Modes in silver-iodide-lined hollow metallic waveguides mapped by terahertz near-field time-domain microscopy

Navarro‐Cía, Miguel; Bledt, Carlos M.; Vitiello, Miriam S.; Beere, Harvey E.; Ritchie, D. A.; Harrington, James A.; Mitrofanov, Oleg

doi:10.1364/josab.30.000127

Cited by 18 publications

(12 citation statements)

References 33 publications

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“…The hollow silver-coated waveguide exhibits no absorption band at 1.2 THz. It has a featureless transmission spectrum within the characterized region (from 0.5 THz to 2.5 THz) with the loss increasing practically linearly [16]. By comparing the numerically-computed transmission loss spectra of the Ag-only waveguide [gray lines in Fig.…”

Section: Experiments Modeling and Discussionmentioning

confidence: 99%

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Terahertz wave transmission in flexible polystyrene-lined hollow metallic waveguides for the 25-5 THz band

Navarro‐Cía¹,

Vitiello²,

Bledt³

et al. 2013

Opt. Express

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A low-loss and low-dispersive optical-fiber-like hybrid HE 11 mode is developed within a wide band in metallic hollow waveguides if their inner walls are coated with a thin dielectric layer. We investigate terahertz (THz) transmission losses from 0.5 to 5.5 THz and bending losses at 2.85 THz in a polystyrene-lined silver waveguides with core diameters small enough (1 mm) to minimize the number of undesired modes and to make the waveguide flexible, while keeping the transmission loss of the HE 11 mode low. The experimentally measured loss is below 10 dB/m for 2 < ν < 2.85 THz (~4-4.5 dB/m at 2.85 THz) and it is estimated to be below 3 dB/m for 3 < ν < 5 THz according to the numerical calculations. At ~1.25 THz, the waveguide shows an absorption peak of ~75 dB/m related to the transition between the TM 11 -like mode and the HE 11 mode. 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.

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Section: Experiments Modeling and Discussionmentioning

confidence: 99%

“…The transmission properties of the PS-lined cylindrical waveguide are modeled with CST Microwave Studio TM using a 2-D eigenmode analysis [16]. To simplify the calculation, the silica tubing is not considered in the waveguide system.…”

Section: Appendix: Numerical Simulationsmentioning

confidence: 99%

Terahertz wave transmission in flexible polystyrene-lined hollow metallic waveguides for the 25-5 THz band

Navarro‐Cía¹,

Vitiello²,

Bledt³

et al. 2013

Opt. Express

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“…Near-field mapping of the terahertz field at the waveguide output allows us to optimize coupling from the incident terahertz pulse and determine the spatial mode profiles. The cut-back loss measurement method also avoids potential errors due to the variation of the coupling coefficient with frequency [4,25,26].…”

Section: Methodsmentioning

confidence: 99%

“…4. At very low frequencies, the PTFE film is electrically negligible, and thus, the PTFE-lined HMW supports similar modes as a silver-only HMW [25,[32][33][34]. Hence, we denote the discussed modes in the case of the PTFE-lined HMW as TE 11 Attenuation of the TE 11 * mode, which has the lowest cut-off frequency mode (magenta line in Fig.…”

Section: Transmission Losses and Field Distribution Inside The Waveguidementioning

confidence: 99%

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Silver-Coated Teflon Tubes for Waveguiding at 1–2 THz

Navarro‐Cía

Melzer

Harrington

et al. 2015

J Infrared Milli Terahz Waves

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Realization of single-mode low-loss waveguides for 1.0-2.0 THz remains a challenging problem due to large absorption in most dielectrics and ohmic losses in metals. To address this problem, we investigate dielectric-lined hollow metallic waveguides fabricated by coating 1-mm diameter 38-μm-thick polytetrafluoroethylene tubes with silver. These waveguides support a hybrid HE 11 mode, which exhibits low attenuation and low dispersion. Quasisingle-mode propagation is achieved in the band of 1.0-1.6 THz, in which the hybrid HE 11 mode is supported by the waveguide. In this band, the experimentally measured loss is 20 dB/m (~0.046 cm −1 ), whereas the numerically computed loss is~7 dB/m (~0.016 cm). The difference is attributed to additional losses in the dielectric layer, which can be reduced by using alternative polymers.

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Iodization‐Induced Reversible Wettability in Nanostructured Ag Films

Praveena

Vanjarana

Purkayastha

et al. 2017

Physica Status Solidi (a)

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Ag films of 5 nm thickness were iodized for durations up to 3 h leading to the formation of b-AgI structure. The water contact angle (WCA) for the uniodized and as-deposited Ag film was 107.2 which is decreased to 70.7 on iodization for 3 h. In contrast, the Ag films annealed at 300 C for 2 h prior to iodization showed a water contact angle of 40.3 . The WCA decreased further to 14.9 after iodization for 3 h. This hydrophobic-hydrophilic transition can be related to the chemical modification of the surface change in crystal structure and variation in surface roughness. Significantly, the films also exhibited reversible wettabilty under UV irradiation.

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Modes in silver-iodide-lined hollow metallic waveguides mapped by terahertz near-field time-domain microscopy

Cited by 18 publications

References 33 publications

Terahertz wave transmission in flexible polystyrene-lined hollow metallic waveguides for the 25-5 THz band

Terahertz wave transmission in flexible polystyrene-lined hollow metallic waveguides for the 25-5 THz band

Silver-Coated Teflon Tubes for Waveguiding at 1–2 THz

Iodization‐Induced Reversible Wettability in Nanostructured Ag Films

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