Superfocusing terahertz waves below λ/250 using plasmonic parallel-plate waveguides
Open accessAbstract
We experimentally demonstrate complete two-dimensional (2-D) confinement of terahertz (THz) energy in finite-width parallel-plate waveguides, defying conventional wisdom in the century-old field of microwave waveguide technology. We find that the degree of energy confinement increases exponentially with decreasing plate separation. We propose that this 2-D confinement is mediated by the mutual coupling of plasmonic edge modes, analogous to that observed in slot waveguides at optical wavelengths. By adiabatically tapering the width and the separation, we focus THz waves down to a size of 10 microm (approximately lambda/260) by 18 microm ( approximately lambda/145), which corresponds to a mode area of only 2.6 x 10(-5) lambda(2).
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Waveguide geometries using slowly varying metal surfaces have recently drawn interest in the terahertz range.
“Waveguide geometries based on slowly varying metal surfaces have recently attracted interest in the THz range.[8][9][10][11][12][13]”
From Highly sensitive terahertz measurement of layer thickness using a two-cylinder waveguide sensor (2010) · cites this paper as [10]
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References 27 · Cited by 120
- Authors
- Zhan, H., Mendis, R., & Mittleman, D. M.
- Affiliations
- Rice University (US)
- ORCID
- Mittleman, Daniel M.
- Venue
- Optics Express
- Publisher
- Optica Publishing Group
- Published
- 2010-04-23
- Volume
- 18
- Issue
- 9
- Pages
- 9643
- ISSN
- 1094-4087 (ISSN-L)
- OpenAlex
- W2085712084
- Cited by
- 120
- References
- 27
- Citations by year
- 2025: 3 · 2024: 1 · 2023: 2 · 2022: 1 · 2021: 3 · 2020: 3 · 2019: 4 · 2018: 11 · 2017: 8 · 2016: 10 · 2015: 2 · 2014: 9 · 2013: 17 · 2012: 15
- FWCI
- 15.89
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Optics Express (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Air Force Office of Scientific Research
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Terahertz technology and applications
- Physical Sciences › Engineering › Biomedical Engineering › Plasmonic and Surface Plasmon Research
- Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Metamaterials and Metasurfaces Applications
- Keywords
- terahertz radiation, plasmonic waveguides, parallel-plate waveguide, two-dimensional confinement, mutual coupling, adiabatic tapering, subwavelength focusing, mode area, slot waveguide
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