https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/ The latest from Physics » Ultrafast & Terahertz Photonics: Publications (tag [2021]) en-GB (C) 2026 University of Warwick Mon, 30 Mar 2026 08:11:42 GMT http://blogs.law.harvard.edu/tech/rss SiteBuilder2, University of Warwick, http://go.warwick.ac.uk/sitebuilder 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 biomedical highlight Lloyd-Hughes MacPherson Milot nanomaterials perovskites photoluminescence review THz components THz imaging THz spectroscopy ultrafast Untagged https://dx.doi.org/10.1002/adom.202101042 <p><img src="https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/burdanova2021toc2.png?maxWidth=300" alt="Review on CNTs" style="margin-right: 10px;" border="0" align="right" /></p> <p><strong>M.G. Burdanova</strong>, A.P. Tsapenko, M.V. Kharlamova, E.I. Kauppinen, B.P. Gorshunov, J. Kono and <strong>J. Lloyd-Hughes</strong> <br /> Advanced Optical Materials <span class="citation_volume"></span><strong><span class="cit-volume"></span></strong><span class="cit-issue"> </span><strong><span class="cit-pageRange">2101042</span><span class="citation_volume"></span></strong> (Sept 2021) <button class="abstractButton" onclick="location.href='https://doi.org/10.1002/adom.202101042';">web</button> <button class="abstractButton" onclick="location.href='https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/burdanova-adom2021.pdf';">pdf</button> <button class="abstractButton" onclick="showHide('burdanovaRev2021')">Show abstract</button></p> <div id="burdanovaRev2021" style="display: none;">Terahertz (THz) spectroscopy is an ideal non-contact and non-destructive technique that probes the electrical conductivity of nanomaterials. This review presents the current status of research in the THz properties of quasi-1D materials, such as nanotubes (NTs) and NT heterostructures. The detailed description of THz experimental methods (THz time-domain spectroscopy, optical pump-THz probe spectroscopy) and conductivity extraction methods are presented along with the physical models (Drude, plasmon, effective medium theories, etc.) supporting them. Optoelectronic applications, such as optical modulators, switches, and shielding devices, are discussed and illustrate a bright future for these materials.</div> <div align="left"><img src="https://api.elsevier.com/content/abstract/citation-count?doi=10.1002/adom.202101042&amp;httpAccept=image%2Fjpeg&amp;apiKey=23942728d429d8cd622400c4a7485a23" border="0" /></div> <div class="altmetric-embed" data-badge-popover="right" data-badge-type="2" data-doi="10.1002/adom.202101042" data-hide-no-mentions="true"></div> THz spectroscopy nanomaterials Lloyd-Hughes review 2021 Thu, 30 Sep 2021 21:28:00 GMT 8a1785d87b77d89c017c389bfe4a18d0 https://doi.org/10.1002/adfm.202104969 <p><img src="https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/adfm-3211_ibc.jpg?maxWidth=300" alt="1D van der Waals hetereostructures" style="margin-right: 10px;" border="0" align="right" /></p> <p><strong>M.G. Burdanova</strong>, M. Liu, <strong>M. Staniforth</strong>, Y. Zheng, R. Xiang, S. Chiashi, A. Anisimov, E. I. Kauppinen, S. Maruyama and <strong>J. Lloyd-Hughes</strong> <br />Advanced Functional Materials <span class="citation_volume"></span><strong><span class="cit-volume"></span></strong><span class="cit-issue"> </span><span class="cit-pageRange">2104969</span><strong><span class="citation_volume"></span></strong> (Sept 2021) <button class="abstractButton" onclick="location.href='https://doi.org/10.1002/adfm.202104969';">web</button> <button class="abstractButton" onclick="location.href='https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/burdanova-adfm2021.pdf';">pdf</button> <button class="abstractButton" onclick="location.href='https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/burdanova-SI-adfm2021.pdf';">SI</button> <button class="abstractButton" onclick="showHide('burdanova2021')">Show abstract</button></p> <div id="burdanova2021" style="display: none;">Strong intertube excitonic coupling is demonstrated in 1D van der Waals heterostructures by examining the ultrafast response of radial C/BN/MoS₂ core/shell/skin nanotubes to femtosecond infrared light pulses. Remarkably, infrared excitation of excitons in the semiconducting carbon nanotubes (CNTs) creates a prominent excitonic response in the visible range from the MoS₂ skin, even with infrared photons at energies well below the bandgap of MoS₂. Via classical analogies and a quantum model of the light&ndash;matter interaction these findings are assigned to intertube excitonic correlations. Dipole&ndash;dipole Coulomb interactions in the coherent regime produce intertube biexcitons, which persist for tens of femtoseconds, while on longer timescales (&gt;100 ps) hole tunneling&mdash;from the CNT core, through the BN tunnel barrier, to the MoS₂ skin&mdash;creates intertube excitons. Charge transfer and dipole&ndash;dipole interactions thus play prominent roles on different timescales, and establish new possibilities for the multi-functional use of these new nanoscale coaxial cables.</div> <div align="left"><img src="https://api.elsevier.com/content/abstract/citation-count?doi=10.1002/adfm.202104969&amp;httpAccept=image%2Fjpeg&amp;apiKey=23942728d429d8cd622400c4a7485a23" border="0" /></div> <div class="altmetric-embed" data-badge-popover="right" data-badge-type="2" data-doi="10.1002/adfm.202104969" data-hide-no-mentions="true"></div> nanomaterials Lloyd-Hughes ultrafast 2021 Tue, 21 Sep 2021 19:29:00 GMT 8a17841a7b77d8a1017c09d55e977b9c https://aip.scitation.org/doi/10.1063/5.0064146 <p><img src="https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/mosley2021.png?maxWidth=300" alt="Multi-pixel emitters" style="margin-right: 10px;" border="0" align="right" /></p> <p><strong>C.D.W. Mosley, J. Deveikis </strong>and <strong>J. Lloyd-Hughes</strong> <br />Appl. Phys. Lett. <span class="citation_volume"></span><strong>119<span class="cit-volume"></span></strong><span class="cit-issue"> </span><span class="cit-pageRange">121105</span><strong><span class="citation_volume"></span></strong> (Sep 2021) <button class="abstractButton" onclick="location.href='https://doi.org/10.1063/5.0064146';">web</button> <button class="abstractButton" onclick="location.href='https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/mosley2021.pdf';">pdf</button> <button class="abstractButton" onclick="showHide('mosley2021')">Show abstract</button></p> <div id="mosley2021" style="display: none;">Full control of the ellipticity of broadband pulses of THz radiation, from linear to left- or right-handed circular polarization, was demonstrated via a four-pixel photoconductive emitter with an integrated achromatic waveplate. Excellent polarization purity and accuracy were achieved, with Stokes parameters exceeding 97% for linear and circular polarization, via a robust scheme that corrected electrically for polarization changes caused by imperfect optical elements. Furthermore, to assess the speed and precision of measurements of the THz polarization, we introduced a figure of merit, the standard error after one second of measurement, found to be 0.047° for the polarization angle.</div> <div align="left"><img src="https://api.elsevier.com/content/abstract/citation-count?doi=10.1063/5.0064146&amp;httpAccept=image%2Fjpeg&amp;apiKey=23942728d429d8cd622400c4a7485a23" border="0" /></div> <div class="altmetric-embed" data-badge-popover="right" data-badge-type="2" data-doi="10.1063/5.0064146" data-hide-no-mentions="true"></div> THz spectroscopy THz components Lloyd-Hughes 2021 Tue, 21 Sep 2021 11:00:00 GMT 8a1785d88461a315018463cf65ef1418 https://pubs.acs.org/doi/10.1021/acsnano.1c03705 <p><img src="https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/kashtiban2021.jpg?maxWidth=300" alt="CsI atomic chains" style="margin-right: 10px;" border="0" align="right" /></p> <p>R.J. Kashtiban, <strong>M.G. Burdanova</strong>, A. Vasylenko, J. Wynn, P.V.C. Medeiros, Q. Ramasse, A.J. Morris, D. Quigley, <strong>J. Lloyd-Hughes</strong> and J. Sloan<br /> ACS Nano <span class="citation_volume"></span><span class="cit-issue"></span><span class="cit-issue"><strong><span class="cit-volume">15</span></strong><span class="cit-issue"> </span><span class="cit-pageRange">13389</span></span><span class="cit-pageRange"></span><strong><span class="citation_volume"></span></strong> (Aug 2021) <button class="abstractButton" onclick="location.href='https://doi.org/10.1021/acsnano.1c03705';">web</button> <button class="abstractButton" onclick="location.href='https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/kashtiban2021.pdf';">pdf</button> <button class="abstractButton" onclick="showHide('kashtiban2021')">Show abstract</button></p> <div id="kashtiban2021" style="display: none;">One-dimensional (1D) atomic chains of CsI were previously reported in double-walled carbon nanotubes with ∼0.8 nm inner diameter. Here, we demonstrate that, while 1D CsI chains form within narrow ∼0.73 nm diameter single-walled carbon nanotubes (SWCNTs), wider SWCNT tubules (∼0.8&ndash;1.1 nm) promote the formation of helical chains of CsI 2 × 1 atoms in cross-section. These CsI helices create complementary oval distortions in encapsulating SWCNTs with highly strained helices formed from strained Cs₂I₂ parallelogram units in narrow tubes to lower strain Cs₂I₂ units in wider tubes. The observed structural changes and charge distribution were analyzed by density-functional theory and Bader analysis. CsI chains also produce conformation-selective changes to the electronic structure and optical properties of the encapsulating tubules. The observed defects are an interesting variation from defects commonly observed in alkali halides as these are normally associated with the Schottky and Frenkel type. The energetics of CsI 2 × 1 helix formation in SWCNTs suggests how these could be controllably formed.</div> <div align="left"><img src="https://api.elsevier.com/content/abstract/citation-count?doi=10.1021/acsnano.1c03705&amp;httpAccept=image%2Fjpeg&amp;apiKey=23942728d429d8cd622400c4a7485a23" border="0" /></div> <div class="altmetric-embed" data-badge-popover="right" data-badge-type="2" data-doi="10.1021/acsnano.1c03705" data-hide-no-mentions="true"></div> nanomaterials photoluminescence Lloyd-Hughes 2021 Tue, 10 Aug 2021 06:47:00 GMT 8a1785d77b065d9b017b2ed0e4051fd3 https://iopscience.iop.org/article/10.1088/1361-648X/abfe21 <p><img src="https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/intro-figure1.png?maxWidth=300" alt="roadmap" style="margin-right: 10px;" border="0" align="right" /></p> <p><strong>J. Lloyd-Hughes</strong>, P.M. Oppeneer, T. Pereira dos Santos, A. Schleife, S. Meng, M.A. Sentef, M. Ruggenthaler, A. Rubio, I. Radu, M. Murnane, X. Shi, H. Kapteyn, B. Stadtmüller, K.M. Dani, F.H. da Jornada, E. Prinz, M. Aeschlimann, <strong>R.L. Milot</strong>, <strong>M. Burdanova</strong>, J. Boland, T. Cocker and F. Hegmann <br /> J. Phys.: Cond. Matt. <strong><span class="citation_volume">33</span></strong> 353001 (July 2021) <button class="abstractButton" onclick="location.href='https://iopscience.iop.org/article/10.1088/1361-648X/abfe21';">web</button> <button class="abstractButton" onclick="location.href='https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/lloyd-hughes2021.pdf';">pdf</button> <button class="abstractButton" onclick="showHide('lloyd-hughes2021')">abstract</button></p> <div id="lloyd-hughes2021" style="display: none;">In the 60 years since the invention of the laser, the scientific community has developed numerous fields of research based on these bright, coherent light sources, including the areas of imaging, spectroscopy, materials processing and communications. Ultrafast spectroscopy and imaging techniques are at the forefront of research into the light&ndash;matter interaction at the shortest times accessible to experiments, ranging from a few attoseconds to nanoseconds. Light pulses provide a crucial probe of the dynamical motion of charges, spins, and atoms on picosecond, femtosecond, and down to attosecond timescales, none of which are accessible even with the fastest electronic devices. Furthermore, strong light pulses can drive materials into unusual phases, with exotic properties. In this roadmap we describe the current state-of-the-art in experimental and theoretical studies of condensed matter using ultrafast probes. In each contribution, the authors also use their extensive knowledge to highlight challenges and predict future trends.</div> <div align="left"><img src="https://api.elsevier.com/content/abstract/citation-count?doi=10.1088/1361-648X/abfe21&amp;httpAccept=image%2Fjpeg&amp;apiKey=23942728d429d8cd622400c4a7485a23" border="0" /></div> <div class="altmetric-embed" data-badge-popover="right" data-badge-type="2" data-doi="10.1088/1361-648X/abfe21" data-hide-no-mentions="true"></div> THz spectroscopy nanomaterials Milot perovskites Lloyd-Hughes ultrafast review 2021 Mon, 05 Jul 2021 12:02:00 GMT 8a17841a7a5bbe98017a768cc38e6470 https://journals.aps.org/prb/abstract/10.1103/PhysRevB.103.245205 <p><img src="https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/xia2021.png?maxWidth=300" alt="InSb cyclotron" style="margin-right: 10px;" border="0" align="right" /></p> <p>C.Q. Xia, <strong>M. Monti</strong>, J.L. Boland, L.M. Herz, <strong>J. Lloyd-Hughes</strong>, M.R. Filip and M.B. Johnston <br /> Phys. Rev. B <span class="citation_volume"></span><strong><span class="cit-volume"></span></strong><span class="cit-issue"></span><span class="cit-pageRange"></span><strong><span class="citation_volume">103</span></strong> 245205 (June 2021) <button class="abstractButton" onclick="location.href='https://doi.org/10.1103/PhysRevB.103.245205';">web</button> <button class="abstractButton" onclick="location.href='https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/xia2021.pdf';">pdf</button> <button class="abstractButton" onclick="showHide('xia2021')">Show abstract</button></p> <div id="xia2021" style="display: none;">Measuring terahertz (THz) conductivity on an ultrafast timescale is an excellent way to observe charge-carrier dynamics in semiconductors as a function of time after photoexcitation. However, a conductivity measurement alone cannot separate the effects of charge-carrier recombination from effective mass changes as charges cool and experience different regions of the electronic band structure. Here we present a form of time-resolved magneto-THz spectroscopy that allows us to measure cyclotron effective mass on a picosecond timescale. We demonstrate this technique by observing electron cooling in the technologically significant narrow-bandgap semiconductor indium antimonide. A significant reduction of electron effective mass from 0.032 to 0.017 me is observed in the first 200 ps after injecting hot electrons. The measured electron effective mass in InSb as a function of photoinjected electron density agrees well with conduction band nonparabolicity predictions from ab initio calculations of the quasiparticle band structure.</div> <div align="left"><img src="https://api.elsevier.com/content/abstract/citation-count?doi=10.1103/PhysRevB.103.245205&amp;httpAccept=image%2Fjpeg&amp;apiKey=23942728d429d8cd622400c4a7485a23" border="0" /></div> <div class="altmetric-embed" data-badge-popover="right" data-badge-type="2" data-doi="10.1103/PhysRevB.103.245205" data-hide-no-mentions="true"></div> THz spectroscopy Lloyd-Hughes 2021 Tue, 29 Jun 2021 08:37:00 GMT 8a1785d87a533059017a56ea19cf04b8 https://aip.scitation.org/doi/abs/10.1063/5.0055259 <p><img src="https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/chen2020.png?maxWidth=200" alt="Diagram" style="margin-right: 20px;" border="0" align="right" /></p> <p><strong>H. Lindley-Hatcher, </strong>R. I. Stantchev, X. Chen, <strong>A. I. Hernandez-Serrano</strong>, J. Hardwicke and <strong>E. Pickwell-MacPherson</strong><br /> Appl. Phys. Lett. <strong>118</strong>, 230501 (June 2021) <button class="abstractButton" onclick="location.href='https://aip.scitation.org/doi/abs/10.1063/5.0055259';">web</button> <button class="abstractButton" onclick="location.href='https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/lindley-hatcher2021.pdf';">pdf</button> <button class="abstractButton" onclick="showHide('lindley-hatcher2021')">Show abstract</button></p> <div id="lindley-hatcher2021" style="display: none;">It was first suggested that terahertz imaging has the potential to detect skin cancer twenty years ago. Since then, THz instrumentation has improved significantly: real time broadband THz imaging is now possible and robust protocols for measuring living subjects have been developed. Here, we discuss the progress that has been made as well as highlight the remaining challenges for applying THz imaging to skin cancer detection.</div> <div class="altmetric-embed" data-badge-popover="right" data-badge-type="2" data-doi="10.1063/5.0055259" data-hide-no-mentions="true"></div> <div><img src="https://api.elsevier.com/content/abstract/citation-count?doi=10.1063/5.0055259&amp;httpAccept=image%2Fjpeg&amp;apiKey=23942728d429d8cd622400c4a7485a23" border="0" /></div> THz spectroscopy MacPherson THz imaging biomedical review 2021 Thu, 10 Jun 2021 11:30:00 GMT 8a1785d77b77d622017be41422977fa5 https://onlinelibrary.wiley.com/doi/10.1002/aenm.202003877 <p><img src="https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/balogun2021.jpg?maxWidth=200" alt="Helen review" style="margin-right: 10px;" border="0" align="right" /></p> <p>D. Sirbu, <strong>F. H. Balogun</strong>, <strong>R. L. Milot</strong> and P. Docampo <br /> Advanced Energy Materials <span class="citation_volume"></span><strong><span class="cit-volume"></span></strong><span class="cit-issue"></span><span class="cit-pageRange"></span><strong><span class="citation_volume"></span></strong> (May 2021) <button class="abstractButton" onclick="location.href='https://doi.org/10.1002/aenm.202003877';">web</button> <button class="abstractButton" onclick="location.href='https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/balogun2021.pdf';">pdf</button> <button class="abstractButton" onclick="showHide('balogun2021')">Show abstract</button></p> <div id="balogun2021" style="display: none;">Layered hybrid perovskites (LPKs) have emerged as a viable solution to address perovskite stability concerns and enable their implementation in wide-scale energy harvesting. Yet, although more stable, the performance of devices incorporating LPKs still lags behind that of state-of-the-art, multi-cation perovskite materials. This is typically assigned to their poor charge transport, currently caused by the choice of cations used within the organic layer. On balance, a compromise between efficiency and stability is sought, involving careful control of phase purity and distribution, interfaces and energy/charge transfer processes. Further progress is hindered by the difficulty in identifying the fundamental optoelectronic processes in these materials. Here, the high exciton binding energy of LPKs lead to the formation of multiple photoexcited species, which greatly complicate measurement interpretation. In this light, this review gives an overview of how complementary measurement techniques must be used to separate the contributions from the different species in order to identify device bottlenecks, and become a useful tool to narrow down the limitless list of organic cations. A move away from making compromises to mitigate the impact of poor charge transport is required. The root of the problem must be addressed instead through rational design of the interlayer cations.</div> <div align="left"><img src="https://api.elsevier.com/content/abstract/citation-count?doi=10.1002/aenm.202003877&amp;httpAccept=image%2Fjpeg&amp;apiKey=23942728d429d8cd622400c4a7485a23" border="0" /></div> <div class="altmetric-embed" data-badge-popover="right" data-badge-type="2" data-doi="10.1002/aenm.202003877" data-hide-no-mentions="true"></div> THz spectroscopy nanomaterials photoluminescence Milot perovskites review 2021 Wed, 09 Jun 2021 09:14:00 GMT 8a17841b79d8782b0179f00d29314727 https://doi.org/10.1016/j.carbon.2020.11.008 <p><img src="https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/maria-carbon2020.jpg?maxWidth=300" alt="1D van der Waals hetereostructures" style="margin-right: 10px;" border="0" align="right" /></p> <p><strong>M.G. Burdanova</strong>, G.M. Katybab, R. Kashtiban, G.A. Komandin, <strong>E. Butler-Caddle</strong>, <strong>M. Staniforth</strong>, A.A. Mkrtchyan, D.V. Krasnikov, Y.G. Gladush, J.Sloan, A.G. Nasibulin and <strong>J. Lloyd-Hughes</strong><br /> Carbon <span class="citation_volume"></span><strong><span class="cit-volume">173</span></strong><span class="cit-issue"> 245</span><span class="cit-pageRange"></span><strong><span class="citation_volume"></span></strong> (Mar 2021) <button class="abstractButton" onclick="location.href='https://doi.org/10.1016/j.carbon.2020.11.008';">web</button> <button class="abstractButton" onclick="location.href='https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/burdanova-carbon2020.pdf';">pdf</button> <button class="abstractButton" onclick="showHide('burdanova2020')">Show abstract</button></p> <div id="burdanova2020" style="display: none;">The development of THz technology and communication systems is creating demand for devices that can modulate THz beams rapidly. Here we report the design and characterisation of high-performance, broadband THz modulators based on the photo-induced transparency of carbon nanotube films. Rather than operating in the standard modulation mode, where optical excitation lowers transmission, this new class of modulators exhibits an inverted modulation mode with an enhanced transmission. Under femtosecond pulsed illumination, modulation depths reaching +80% were obtained simultaneously with modulation speeds of 340 GHz. The influence of the film thickness on the insertion loss, modulation speed and modulation depth was explored over a frequency range from 400 GHz to 2.6 THz. The excellent modulation depth and high modulation speed demonstrated the significant potential of carbon nanotube thin films for ultrafast THz modulators.</div> <div align="left"><img src="https://api.elsevier.com/content/abstract/citation-count?doi=10.1016/j.carbon.2020.11.008&amp;httpAccept=image%2Fjpeg&amp;apiKey=23942728d429d8cd622400c4a7485a23" border="0" /></div> <div class="altmetric-embed" data-badge-popover="right" data-badge-type="2" data-doi="10.1016/j.carbon.2020.11.008" data-hide-no-mentions="true"></div> THz spectroscopy THz components nanomaterials Lloyd-Hughes 2021 Mon, 01 Mar 2021 00:00:00 GMT 8a17841b75bc29300175c3dfc07527b4 https://www.nature.com/articles/s41598-021-82503-x <p><img src="https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/arturo2021b.jpg?maxWidth=200" alt="Diagram" style="margin-right: 20px;" border="0" align="right" /></p> <p><strong>A. I. Hernandez-Serrano</strong> and <strong>E. Pickwell-MacPherson</strong><br /> Scientific Reports <strong>11</strong>, 3005 (February 2021) <button class="abstractButton" onclick="location.href='https://doi.org/10.1038/s41598-021-82503-x';">web</button> <button class="abstractButton" onclick="location.href='https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/hernandez-serrano2021.pdf';">pdf</button> <button class="abstractButton" onclick="showHide('arturo2021b')">Show abstract</button></p> <div id="arturo2021b" style="display: none;">In this work we demonstrate a triangular surface lens (axicon) operating at frequencies between 350 and 450 GHz using parallel-plate-waveguide technology. The proposed axicon offers longer focal depth characteristics compared to conventional plastic lenses, surpassing common TPX lenses by one order of magnitude. Additionally, due to the triangular surface of the axicon, this device is able to focus THz radiation onto smaller areas than TPX lenses, enhancing the resolution characteristics of THz imaging systems. The frequency range of operation of the proposed axicon can be easily tuned by changing the space between plates, making this approach a very attractive candidate for low-cost, robust and easy to assemble solutions for the next generation of active THz devices.</div> <div class="altmetric-embed" data-badge-popover="right" data-badge-type="2" data-doi="10.1038/s41598-021-82503-x" data-hide-no-mentions="true"></div> <div><img src="https://api.elsevier.com/content/abstract/citation-count?doi=10.1038/s41598-021-82503-x&amp;httpAccept=image%2Fjpeg&amp;apiKey=23942728d429d8cd622400c4a7485a23" border="0" /></div> THz components MacPherson THz imaging 2021 Thu, 04 Feb 2021 13:20:00 GMT 8a17841a7b77d8a1017be4439a0e0586