https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/ The latest from Physics » Ultrafast & Terahertz Photonics: Publications (tag [2022]) 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://journals.aps.org/prl/abstract/10.1103/PhysRevLett.129.237401 <p><img src="https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/keat2022.jpg?maxWidth=200" alt="PFID" style="margin-right: 10px;" border="0" align="right" /></p> <p><strong>T.J. Keat </strong>, D.&thinsp;J.&thinsp;L. Coxon, M. Staniforth, M.&thinsp;W. Dale, V.&thinsp;G. Stavros, M.&thinsp;E. Newton, and <strong>J. Lloyd-Hughes</strong> <br />Phys. Rev. Lett. <span class="citation_volume"></span><strong>129<span class="cit-volume"></span></strong><span class="cit-issue"> </span><span class="cit-pageRange">237401</span><strong><span class="citation_volume"></span></strong> (Nov 2022) <button class="abstractButton" onclick="location.href='https://doi.org/10.1103/PhysRevLett.129.237401';">web</button> <button class="abstractButton" onclick="location.href='https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/keat2022.pdf';">pdf</button> <button class="abstractButton" onclick="showHide('keat2022')">Show abstract</button></p> <div id="keat2022" style="display: none;">The perturbed free induction decay (PFID) observed in ultrafast infrared spectroscopy was used to unveil the rates at which different vibrational modes of the same atomic-scale defect can interact with their environment. The N₃VH⁰ defect in diamond provided a model system, allowing a comparison of stretch and bend vibrational modes within different crystal lattice environments. The observed bend mode (first overtone) exhibited dephasing times T₂=2.8(1)&thinsp;&thinsp;ps, while the fundamental stretch mode had surprisingly faster dynamics T₂&lt;1.7&thinsp;&thinsp;ps driven by its more direct perturbation of the crystal lattice, with increased phonon coupling. Further, at high defect concentrations the stretch mode’s dephasing rate was enhanced. The ability to reliably measure T₂ via PFID provides vital insights into how vibrational systems interact with their local environment.</div> <div align="left"><img src="https://api.elsevier.com/content/abstract/citation-count?doi=10.1103/PhysRevLett.129.237401&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/PhysRevLett.129.237401" data-hide-no-mentions="true"></div> Lloyd-Hughes 2022 ultrafast highlight Tue, 29 Nov 2022 18:45:00 GMT 8a17841a84aafe070184c4b59f403938 https://doi.org/10.1364/OE.473086 <p><img src="https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/deveikis2022.jpg?maxWidth=200" alt="Multi-pixel emitters" style="margin-right: 10px;" border="0" align="right" /></p> <p><strong>J. Deveikis </strong>and <strong>J. Lloyd-Hughes</strong> <br />Optics Express <span class="citation_volume"></span><strong>30<span class="cit-volume"></span></strong><span class="cit-issue"> </span><span class="cit-pageRange">43293</span><strong><span class="citation_volume"></span></strong> (Nov 2022) <button class="abstractButton" onclick="location.href='https://doi.org/10.1364/OE.473086';">web</button> <button class="abstractButton" onclick="location.href='https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/deveikis2022.pdf';">pdf</button> <button class="abstractButton" onclick="showHide('deveikis2022')">Show abstract</button></p> <div id="deveikis2022" style="display: none;">A multi-pixel photoconductive emitter is reported that generates THz beams with either azimuthal, radial or linear polarization states. Switching between the different polarization states was purely electrical, via the bias voltage applied, circumventing the need for mechanical polarization optics or different THz emitters to change the polarization. Dipole array modelling was performed to validate emitter array designs, and to explore their optimal bias configuration, while spatially-resolved electro-optic detection of the generated beams confirmed that cylindrical-vector beams were produced. We further demonstrate that the spatial beam profile was optimized by adjusting the bias level on particular pixels, improving the polarization purity of the beam.</div> <div align="left"><img src="https://api.elsevier.com/content/abstract/citation-count?doi=10.1364/OE.473086&amp;httpAccept=image%2Fjpeg&amp;apiKey=23942728d429d8cd622400c4a7485a23" border="0" /></div> <div class="altmetric-embed" data-badge-popover="right" data-badge-type="2" data-doi="10.1364/OE.473086" data-hide-no-mentions="true"></div> THz spectroscopy THz components Lloyd-Hughes 2022 Thu, 10 Nov 2022 13:00:00 GMT 8a1785d87b77d89c017c0d6f789f4771 https://doi.org/10.1063/5.0068979 <p><img src="https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/chen2022.png?maxWidth=200" alt="Diagram" style="margin-right: 20px;" border="0" align="right" /></p> <p>X. Chen, <strong>H. Lindley-Hatcher, R. I. Stantchev,</strong> J. Wang, K. Li, <strong>A. I. Hernandez-Serrano</strong>, Z. D. Taylor, E. Castro-Camus and <strong>E. Pickwell-MacPherson</strong><br />Chem. Phys. Rev. <strong>3</strong>, 011311 (June 2022) <button class="abstractButton" onclick="location.href='https://aip.scitation.org/doi/abs/10.1063/5.0068979';">web</button> <button class="abstractButton" onclick="location.href='https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/Chen2022.pdf';">pdf</button> <button class="abstractButton" onclick="showHide('Chen2022')">Show abstract</button></p> <div id="Chen2022" style="display: none;">Terahertz (THz) technology has experienced rapid development in the past two decades. Growing numbers of interdisciplinary applications are emerging, including materials science, physics, communications, and security as well as biomedicine. THz biophotonics involves studies applying THz photonic technology in biomedicine, which has attracted attention due to the unique features of THz waves, such as the high sensitivity to water, resonance with biomolecules, favorable spatial resolution, capacity to probe the water&ndash;biomolecule interactions, and nonionizing photon energy. Despite the great potential, THz biophotonics is still at an early stage of development. There is a lack of standards for instrumentation, measurement protocols, and data analysis, which makes it difficult to make comparisons among all the work published. In this article, we give a comprehensive review of the key findings that have underpinned research into biomedical applications of THz technology. In particular, we will focus on the advances made in general THz instrumentation and specific THz-based instruments for biomedical applications. We will also discuss the theories describing the interaction between THz light and biomedical samples. We aim to provide an overview of both basic biomedical research as well as pre-clinical and clinical applications under investigation. The paper aims to provide a clear picture of the achievements, challenges, and future perspectives of THz biophotonics.</div> <div class="altmetric-embed" data-badge-popover="right" data-badge-type="2" data-doi="10.1063/5.0068979" data-hide-no-mentions="true"></div> <div><img src="https://api.elsevier.com/content/abstract/citation-count?doi=10.1063/5.0068979&amp;httpAccept=image%2Fjpeg&amp;apiKey=23942728d429d8cd622400c4a7485a23" border="0" /></div> THz spectroscopy MacPherson 2022 biomedical review Wed, 01 Jun 2022 08:45:00 GMT 8a1785d881f6b0ba01821315e3163008 https://doi.org/10.1364/OE.451633 <p><img src="https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/ding2022.png?maxWidth=200" alt="Diagram" style="margin-right: 20px;" border="0" align="right" /></p> <p><strong>X. Ding, A. I. Hernandez-Serrano, H. Lindley-Hatcher, R. I. Stantchev</strong>, J. Zhou and <strong>E. Pickwell-MacPherson</strong><br />Optics Express <strong>30</strong>, 18079 (May 2022) <button class="abstractButton" onclick="location.href='https://doi.org/10.1364/OE.451633';">web</button> <button class="abstractButton" onclick="location.href='https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/Ding2022.pdf';">pdf</button> <button class="abstractButton" onclick="showHide('Ding2022')">Show abstract</button></p> <div id="Ding2022" style="display: none;">Terahertz time-domain spectroscopy (THz-TDS) has shown promise in biomedical sample characterization and high characterization sensitivity is in demand due to the thin-film (TF) feature of the sample. This paper proposes an optimized multilayer structure for sensitive characterization of TF aqueous solutions in reflection THz-TDS. Theoretical simulations are conducted for structural optimization and the 75 μm window-sample-mirror structure displays the best sensitivity compared to other sandwich structures and traditional THz measurement geometries. 0-20% TF glucose solutions are then measured; and a spectral peak introduced by the proposed structure is observed to result in the high sensitivity. Our work provides a new way of customizing multilayer structure for THz thin-film characterization.</div> <div class="altmetric-embed" data-badge-popover="right" data-badge-type="2" data-doi="10.1364/OE.451633" data-hide-no-mentions="true"></div> <div><img src="https://api.elsevier.com/content/abstract/citation-count?doi=10.1364/OE.451633&amp;httpAccept=image%2Fjpeg&amp;apiKey=23942728d429d8cd622400c4a7485a23" border="0" /></div> THz spectroscopy MacPherson 2022 Sun, 01 May 2022 19:55:00 GMT 8a17841b81f6ae52018212e4d2745b2a https://pubs.acs.org/doi/10.1021/acsnano.2c01647 <p><img src="https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/hu2022.jpg?maxWidth=300" alt="HgTe" style="margin-right: 10px;" border="0" align="right" /></p> <p><strong>Z. Hu</strong>, B. Breeze, R.J. Kashtiban, J. Sloan and <strong>J. Lloyd-Hughes</strong><br />ACS Nano <span class="citation_volume"></span><span class="cit-issue"></span><span class="cit-issue"><strong><span class="cit-volume"></span></strong><span class="cit-issue"> </span><span class="cit-pageRange"></span></span><span class="cit-pageRange"></span><strong><span class="citation_volume"></span> <span class="cit-volume">16</span></strong><span class="cit-pageRange"> 6789 </span>(Apr 2022) <button class="abstractButton" onclick="location.href='https://doi.org/10.1021/acsnano.2c01647';">web</button> <button class="abstractButton" onclick="location.href='https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/hu2022.pdf';">pdf</button> <button class="abstractButton" onclick="showHide('hu2022')">Show abstract</button></p> <div id="hu2022" style="display: none;">Atomically thin nanowires (NWs) can be synthesized inside single-walled carbon nanotubes (SWCNTs) and feature unique crystal structures. Here we show that HgTe nanowires formed inside small-diameter (&lt;1 nm) SWCNTs can advantageously alter the optical and electronic properties of the SWCNTs. Metallic purification of the filled SWCNTs was achieved by a gel column chromatography method, leading to an efficient extraction of the semiconducting and metallic portions with known chiralities. Electron microscopic imaging revealed that zigzag HgTe chains were the dominant NW geometry in both the semiconducting and metallic species. Equilibrium-state and ultrafast spectroscopy demonstrated that the coupled electron&ndash;phonon system was modified by the encapsulated HgTe NWs, in a way that varied with the chirality. For semiconducting SWCNTs with HgTe NWs, Auger relaxation processes were suppressed, leading to enhanced photoluminescence emission. In contrast, HgTe NWs enhanced the Auger relaxation rate of metallic SWCNTs and created faster phonon relaxation, providing experimental evidence that encapsulated atomic chains can suppress hot carrier effects and therefore boost electronic transport.</div> <div align="left"><img src="https://api.elsevier.com/content/abstract/citation-count?doi=10.1021/acsnano.2c01647&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.2c01647" data-hide-no-mentions="true"></div> nanomaterials photoluminescence Lloyd-Hughes 2022 ultrafast Thu, 07 Apr 2022 21:37:00 GMT 8a1785d77faca581018005f5a7594dca https://doi.org/10.1002/aenm.202102776 <p><img src="https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/aenm202102776-gra-0001-m.webp" alt="THz round robin" style="margin-right: 10px;" width="300" border="0" align="right" /></p> <p>H. Hempel, T.J. Savenjie, M. Stolterfoht, J. Neu, M. Failla, V.C. Paingad, P. Kužel, E.J. Heilweil, J.A. Spies, M. Schleuning, J. Zhao, D. Friedrich, K. Schwarzburg, L.D.A. Siebbeles, P. Dörflinger, V. Dyakonov, R. Katoh, M.J. Hong, J.G. Labram, <strong>M. Monti, E. Butler-Caddle, J. Lloyd-Hughes</strong>, M.M. Taheri, J.B. Baxter, T.J. Magnanelli, S. Luo, J.M. Cardon, S. Ardo, T. Unold <br />Advanced Energy Materials <span class="citation_volume"></span><strong><span class="cit-volume"></span></strong><span class="cit-issue"> </span><strong><span class="cit-pageRange">2102776</span><span class="citation_volume"></span></strong> (Feb 2022) <button class="abstractButton" onclick="location.href='https://doi.org/10.1002/aenm.202102776';">web</button> <button class="abstractButton" onclick="location.href='https://warwick.ac.uk/fac/sci/physics/research/condensedmatt/ultrafastphotonics/publications/hempel2022.pdf';">pdf</button> <button class="abstractButton" onclick="showHide('hempel2022')">Show abstract</button></p> <div id="hempel2022" style="display: none;">Bringing together the expertise from fifteen laboratories the current-voltage characteristics of a solar cell are modeled using contactless terahertz and microwave measurements. To this end, the impact of measurement conditions, alternate interpretations, and experimental inter-laboratory variations are discussed. For a neat (Cs,FA,MA)Pb(I,Br)3 thin film, the implied resistance-free JV-curve and the fill factor losses by its finite mobility are revealed.</div> <div align="left"><img src="https://api.elsevier.com/content/abstract/citation-count?doi=10.1002/aenm.202102776&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.202102776" data-hide-no-mentions="true"></div> photoluminescence perovskites Lloyd-Hughes 2022 ultrafast Tue, 01 Mar 2022 11:13:00 GMT 8a17841b7f4044ef017f452f53b40dde