Loss Characteristics of TeraHertz Surface Waves on Laser Micromachined Textured Metals

Suzanna Freer; Jie Qing; Pavel Penchev; Stefan Dimov; Stephen M. Hanham; Miguel Navarro-Cía

doi:10.1109/TTHZ.2024.3358738

Loss Characteristics of TeraHertz Surface Waves on Laser Micromachined Textured Metals

Suzanna Freer, Jie Qing, Pavel Penchev, Stefan Dimov, Stephen M. Hanham, Miguel Navarro-Cía^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

For the application of geometrically-induced THz surface wave technology for communication and sensing, a critical analysis of the propagation characteristics (i.e. dispersion and attenuation) for different textured surfaces should be studied and benchmarked. For the broadband characterisation of archetypal textured surfaces (e.g. corrugated plane, two-dimensional array of blind holes and bed of nails) supporting THz transverse magnetic (i.e., p-polarized) surface waves, we employ time-domain spectroscopy and edge-diffraction coupling methods. Measurements of laser micromachined prototypes demonstrate strong frequency-dependent dispersion and the large impact that surface roughness of the order of few μm has on the path loss, increasing it by a factor ranging from 1.6 to 4.3 compared to smooth textured surfaces. Together with numerical modelling, we disentangle all loss mechanisms (namely, ohmic, scattering, propagation divergence and phase mismatch) and highlight the challenge of loss estimation due to surface roughness in highly confined THz surface waves.

Original language	English
Article number	10414155
Pages (from-to)	283-292
Number of pages	10
Journal	IEEE Transactions on Terahertz Science and Technology
Volume	14
Issue number	2
Early online date	25 Jan 2024
DOIs	https://doi.org/10.1109/TTHZ.2024.3358738
Publication status	Published - 6 Apr 2024

Bibliographical note

This work was supported in part by the EPSRC [Grant Nos. EP/S018395/1
and EP/V001655/1] and the Royal Society [Grant No. IES/R3/183131 and
IEC/NSFC/191104]. S. Freer was supported by the University of Birmingham
[PhD studentship UKRI Project Reference 2137478]. S. M. Hanham and M.
Navarro-C´ıa were supported by the University of Birmingham [Birmingham
Fellowship]. For the purpose of open access, the author(s) has applied a
Creative Commons Attribution (CC BY) license to any Accepted Manuscript
version arising.

Keywords

Surface waves
Surface roughness
Dispersion
Nails
Gratings
Surface topography
Surface texture

Access to Document

10.1109/TTHZ.2024.3358738Licence: None: All rights reserved

Peer-reviewed accepted manuscript
For the purpose of open access, the author(s) has applied a Creative Commons Attribution (CC BY) license to any Accepted Manuscript version arising.
Accepted author manuscript, 12.7 MBLicence: Creative Commons: Attribution (CC BY)

https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10414155

Terahertz Lab-on-a-Chip for Bio-liquid Analysis
Hanham, S.
Engineering & Physical Science Research Council
1/02/21 → 15/05/24
Project: Research Councils
Experimental demonstration of transmissive-type terahertz digital metamaterial based on microfluidic system
Navarro-Cia, M.
The Royal Society
31/03/20 → 30/03/24
Project: Research Councils
THEIA: fast super-resolution TeraHErtz mIcroscopy for nAtural Sciences
Navarro-Cia, M.
Engineering & Physical Science Research Council
1/08/19 → 31/03/21
Project: Research
THz propagation models for complex medical environments
Navarro-Cia, M.
The Royal Society
21/02/19 → 20/02/23
Project: Research

Cite this

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abstract = "For the application of geometrically-induced THz surface wave technology for communication and sensing, a critical analysis of the propagation characteristics (i.e. dispersion and attenuation) for different textured surfaces should be studied and benchmarked. For the broadband characterisation of archetypal textured surfaces (e.g. corrugated plane, two-dimensional array of blind holes and bed of nails) supporting THz transverse magnetic (i.e., p-polarized) surface waves, we employ time-domain spectroscopy and edge-diffraction coupling methods. Measurements of laser micromachined prototypes demonstrate strong frequency-dependent dispersion and the large impact that surface roughness of the order of few μm has on the path loss, increasing it by a factor ranging from 1.6 to 4.3 compared to smooth textured surfaces. Together with numerical modelling, we disentangle all loss mechanisms (namely, ohmic, scattering, propagation divergence and phase mismatch) and highlight the challenge of loss estimation due to surface roughness in highly confined THz surface waves.",

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N2 - For the application of geometrically-induced THz surface wave technology for communication and sensing, a critical analysis of the propagation characteristics (i.e. dispersion and attenuation) for different textured surfaces should be studied and benchmarked. For the broadband characterisation of archetypal textured surfaces (e.g. corrugated plane, two-dimensional array of blind holes and bed of nails) supporting THz transverse magnetic (i.e., p-polarized) surface waves, we employ time-domain spectroscopy and edge-diffraction coupling methods. Measurements of laser micromachined prototypes demonstrate strong frequency-dependent dispersion and the large impact that surface roughness of the order of few μm has on the path loss, increasing it by a factor ranging from 1.6 to 4.3 compared to smooth textured surfaces. Together with numerical modelling, we disentangle all loss mechanisms (namely, ohmic, scattering, propagation divergence and phase mismatch) and highlight the challenge of loss estimation due to surface roughness in highly confined THz surface waves.

AB - For the application of geometrically-induced THz surface wave technology for communication and sensing, a critical analysis of the propagation characteristics (i.e. dispersion and attenuation) for different textured surfaces should be studied and benchmarked. For the broadband characterisation of archetypal textured surfaces (e.g. corrugated plane, two-dimensional array of blind holes and bed of nails) supporting THz transverse magnetic (i.e., p-polarized) surface waves, we employ time-domain spectroscopy and edge-diffraction coupling methods. Measurements of laser micromachined prototypes demonstrate strong frequency-dependent dispersion and the large impact that surface roughness of the order of few μm has on the path loss, increasing it by a factor ranging from 1.6 to 4.3 compared to smooth textured surfaces. Together with numerical modelling, we disentangle all loss mechanisms (namely, ohmic, scattering, propagation divergence and phase mismatch) and highlight the challenge of loss estimation due to surface roughness in highly confined THz surface waves.

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Loss Characteristics of TeraHertz Surface Waves on Laser Micromachined Textured Metals

Abstract

Bibliographical note

Keywords

Access to Document

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Projects

Terahertz Lab-on-a-Chip for Bio-liquid Analysis

Experimental demonstration of transmissive-type terahertz digital metamaterial based on microfluidic system

THEIA: fast super-resolution TeraHErtz mIcroscopy for nAtural Sciences

THz propagation models for complex medical environments

Cite this