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208. Robotic microscopy for everyone: the OpenFlexure microscope

Author

Collins, Joel T., primary, Knapper, Joe, additional, Stirling, Julian, additional, Mduda, Joram, additional, Mkindi, Catherine, additional, Mayagaya, Valeriana, additional, Mwakajinga, Grace A., additional, Nyakyi, Paul T., additional, Sanga, Valerian L., additional, Carbery, Dave, additional, White, Leah, additional, Dale, Sara, additional, Jieh Lim, Zhen, additional, Baumberg, Jeremy J., additional, Cicuta, Pietro, additional, McDermott, Samuel, additional, Vodenicharski, Boyko, additional, and Bowman, Richard, additional

Published
2020
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209. Light-Induced Coalescence of Plasmonic Dimers and Clusters

Author

Salmon, Andrew R., primary, Kleemann, Marie-Elena, additional, Huang, Junyang, additional, Deacon, William M, additional, Carnegie, Cloudy, additional, Kamp, Marlous, additional, de Nijs, Bart, additional, Demetriadou, Angela, additional, and Baumberg, Jeremy J., additional

Published
2020
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211. Multivalent Patchy Colloids for Quantitative 3D Self-Assembly Studies

Author

Kamp, Marlous, primary, de Nijs, Bart, additional, van der Linden, Marjolein N., additional, de Feijter, Isja, additional, Lefferts, Merel J., additional, Aloi, Antonio, additional, Griffiths, Jack, additional, Baumberg, Jeremy J., additional, Voets, Ilja K., additional, and van Blaaderen, Alfons, additional

Published
2020
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216. In-Situ Raman Spectroscopy of Reaction Products in Optofluidic Hollow-Core Fiber Microreactors l'? 17

Author

Gentleman, Alexander S., primary, Miele, Ermanno, additional, Lawson, Takashi, additional, Köhler, Philipp, additional, Kim, Sanmun, additional, Yousaf, Sultaan, additional, Garcia, Daniel Antón, additional, Lage, Ava, additional, Grey, Clare P., additional, Baumberg, Jeremy J., additional, Frosz, Michael H., additional, Russell, Philip St.J., additional, Reisner, Erwin, additional, and Euser, Tijmen G., additional

Published
2020
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226. Robotic microscopy for everyone: the OpenFlexure Microscope

Author

Collins, Joel T., primary, Knapper, Joe, additional, Stirling, Julian, additional, Mduda, Joram, additional, Mkindi, Catherine, additional, Mayagaya, Valeriana, additional, Mwakajinga, Grace A., additional, Nyakyi, Paul T., additional, Sanga, Valerian L., additional, Carbery, Dave, additional, White, Leah, additional, Dale, Sara, additional, Lim, Zhen Jieh, additional, Baumberg, Jeremy J., additional, Cicuta, Pietro, additional, McDermott, Samuel, additional, Vodenicharski, Boyko, additional, and Bowman, Richard, additional

Published
2019
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229. Mapping Nanoscale Hotspots with Single-Molecule Emitters Assembled into Plasmonic Nanocavities Using DNA Origami

Author

Chikkaraddy, Rohit, Turek, VA, Kongsuwan, Nuttawut, Benz, Felix, Carnegie, Cloudy, Van De Goor, Tim, De Nijs, Bart, Demetriadou, Angela, Hess, Ortwin, Keyser, Ulrich F, Baumberg, Jeremy J, Chikkaraddy, Rohit [0000-0002-3840-4188], Hess, Ortwin [0000-0002-6024-0677], Baumberg, Jeremy J [0000-0002-9606-9488], and Apollo - University of Cambridge Repository

Subjects
FOS: Nanotechnology, Optics and Photonics, Letter, SERS, nanocavities, FOS: Physical sciences, Metal Nanoparticles, Physics::Optics, Single-molecule, DNA, Carbocyanines, Surface Plasmon Resonance, Purcell factor, nanoassembly, plasmonics, Nanostructures, strong coupling, MD Multidisciplinary, Nanotechnology, Gold, DNA origami, Nanoscience & Nanotechnology, Optics (physics.optics), Fluorescent Dyes, Physics - Optics
Abstract

Fabricating nanocavities in which optically-active single quantum emitters are precisely positioned, is crucial for building nanophotonic devices. Here we show that self-assembly based on robust DNA-origami constructs can precisely position single molecules laterally within sub-5nm gaps between plasmonic substrates that support intense optical confinement. By placing single-molecules at the center of a nanocavity, we show modification of the plasmon cavity resonance before and after bleaching the chromophore, and obtain enhancements of $\geq4\times10^3$ with high quantum yield ($\geq50$%). By varying the lateral position of the molecule in the gap, we directly map the spatial profile of the local density of optical states with a resolution of $\pm1.5$ nm. Our approach introduces a straightforward non-invasive way to measure and quantify confined optical modes on the nanoscale.

Published
2017

231. Morphology dependence of nanoparticle-on-mirror geometries: A quasinormal mode analysis.

Author

Bedingfield, Kalun, Elliott, Eoin, Kongsuwan, Nuttawut, Baumberg, Jeremy J., and Demetriadou, Angela

Subjects
ELECTROMAGNETIC fields, SINGLE molecules, ANTENNA design, OPTICAL antennas, GEOMETRY, FIELD emission
Abstract

Plasmonic nanoantennas are able to produce extreme enhancements by concentrating electromagnetic fields into sub-wavelength volumes. Recently, one of the most commonly used nanoantennas is the nanoparticle-on-mirror geometry, which allowed for the room temperature strong coupling of a single molecule. Very few studies offer analysis of near-field mode decompositions, and they mainly focus on spherical and/or cylindrically-faceted nanoparticle-on-mirror geometries. Perfectly spherical nanoparticles are not easy to fabricate, with recent publications revealing that a rhombicuboctahedron is a commonly occurring nanoparticle shape – due to the crystalline nature of metallic nanoparticles. In this paper, we perform a quasi-normal mode analysis for the rhombicuboctahedron-on-mirror nanoantenna and map the field distributions of each mode. We examine how the geometry of the cavity defines the near-field distribution and energies of the modes, and we show that in some cases the mode degeneracies break. This has a significant impact on the radiative emission and far-field profile of each mode, which are measured experimentally. Understanding how realistic nanoantenna geometries behave in the near-field and far-field helps us design antennas with specific properties for controlling and sensing quantum emitters in plasmonic systems. [ABSTRACT FROM AUTHOR]

Published
2022
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232. Resolving sub-angstrom ambient motion through reconstruction from vibrational spectra.

Author

Griffiths, Jack, Földes, Tamás, de Nijs, Bart, Chikkaraddy, Rohit, Wright, Demelza, Deacon, William M., Berta, Dénes, Readman, Charlie, Grys, David-Benjamin, Rosta, Edina, and Baumberg, Jeremy J.

Subjects
SINGLE molecules, COMPLEX compounds, FUNCTIONAL groups, DIFFUSION
Abstract

Metal/organic-molecule interactions underpin many key chemistries but occur on sub-nm scales where nanoscale visualisation techniques tend to average over heterogeneous distributions. Single molecule imaging techniques at the atomic scale have found it challenging to track chemical behaviour under ambient conditions. Surface-enhanced Raman spectroscopy can optically monitor the vibrations of single molecules but understanding is limited by the complexity of spectra and mismatch between theory and experiment. We demonstrate that spectra from an optically generated metallic adatom near a molecule of interest can be inverted into dynamic sub-Å metal-molecule interactions using a comprehensive model, revealing anomalous diffusion of a single atom. Transient metal-organic coordination bonds chemically perturb molecular functional groups > 10 bonds away. With continuous improvements in computational methods for modelling large and complex molecular systems, this technique will become increasingly applicable to accurately tracking more complex chemistries. Tracking single molecule movements is a challenging task, but highly desired for applications and fundamental studies. Here the authors reconstruct the sub-angstrom relative movements of a molecule interacting with a metal adatom, by measuring its vibrational spectrum in a self-assembled monolayer, continuously modified by the adatom in a nanoparticle-on-mirror construct. [ABSTRACT FROM AUTHOR]

Published
2021
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233. Theory of strong coupling between molecules and surface plasmons on a grating

Author

Rider, Marie S., Arul, Rakesh, Baumberg, Jeremy J., and Barnes, William L.

Abstract

The strong coupling of molecules with surface plasmons results in hybrid states which are part molecule, part surface-bound light. Since molecular resonances may acquire the spatial coherence of plasmons, which have mm-scale propagation lengths, strong-coupling with molecular resonances potentially enables long-range molecular energy transfer. Gratings are often used to couple incident light to surface plasmons, by scattering the otherwise non-radiative surface plasmon inside the light-line. We calculate the dispersion relation for surface plasmons strongly coupled to molecular resonances when grating scattering is involved. By treating the molecules as independent oscillators rather than the more typically considered single collective dipole, we find the full multi-band dispersion relation. This approach offers a natural way to include the dark states in the dispersion. We demonstrate that for a molecular resonance tuned near the crossing point of forward and backward grating-scattered plasmon modes, the interaction between plasmons and molecules gives a five-band dispersion relation, including a bright state not captured in calculations using a single collective dipole. We also show that the role of the grating in breaking the translational invariance of the system appears in the position-dependent coupling between the molecules and the surface plasmon. The presence of the grating is thus not only important for the experimental observation of molecule-surface-plasmon coupling, but also provides an additional design parameter that tunes the system.

Published
2022
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234. Revealing Nanostructures through Plasmon Polarimetry

Author

Kleemann, Marie-Elena, Mertens, Jan, Zheng, Xuezhi, Cormier, Sean, Turek, Vladimir, Benz, Felix, Chikkaraddy, Rohit, Deacon, William, Lombardi, Anna, Moshchalkov, Victor V, Vandenbosch, Guy AE, Baumberg, Jeremy J, Kleemann, Marie-Elena [0000-0002-6892-7668], Cormier, Sean [0000-0003-2973-8722], Chikkaraddy, Rohit [0000-0002-3840-4188], Baumberg, Jeremy [0000-0002-9606-9488], and Apollo - University of Cambridge Repository

Subjects
plasmonic polarization signature, Physics::Optics, plasmonic cavities, tunable plasmons, nanoparticles, nano-optics
Abstract

Polarized optical dark-field spectroscopy is shown to be a versatile noninvasive probe of plasmonic structures that trap light to the nanoscale. Clear spectral polarization splittings are found to be directly related to the asymmetric morphology of nanocavities formed between faceted gold nanoparticles and an underlying gold substrate. Both experiment and simulation show the influence of geometry on the coupled system, with spectral shifts Δλ = 3 nm from single atoms. Analytical models allow us to identify the split resonances as transverse cavity modes, tightly confined to the nanogap. The direct correlation of resonance splitting with atomistic morphology allows mapping of subnanometre structures, which is crucial for progress in extreme nano-optics involving chemistry, nanophotonics, and quantum devices.

Published
2019
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235. Excitons in a mirror: Formation of 'optical bilayers' using MoS2 monolayers on gold substrates

Author

Mertens, Jan, Shi, Yumeng, Molina-Sanchez, Alejandro, Wirtz, Ludger, Ying Yang, Hui, and Baumberg, Jeremy J.

Subjects
Condensed Matter::Quantum Gases, Condensed Matter::Materials Science, Physique [G04] [Physique, chimie, mathématiques & sciences de la terre], Condensed Matter::Other, Physics [G04] [Physical, chemical, mathematical & earth Sciences], Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 5104 Condensed Matter Physics, 51 Physical Sciences, 5108 Quantum Physics
Abstract

We report coupling of excitons in monolayers of molybdenum disulphide to their mirror image in an underlying gold substrate. Excitons at the direct band gap are little affected by the substrate whereas strongly bound C-excitons associated with a van-Hove singularity change drastically. On quartz substrates only one C-exciton is visible (in the blue) but on gold substrates a strong red-shifted extra resonance in the green is seen. Exciton coupling to its image leads to formation of a “mirror biexciton” with enhanced binding energy. Estimates of this energy shift in an emitter-gold system match experiments well. The absorption spectrum of MoS2 on gold thus resembles a bilayer of MoS2 which has been created by optical coupling. Additional top-mirrors produce an “optical bulk.”

Published
2019
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236. Generation of Quantized Polaritons below the Condensation Threshold

Author

Cristofolini, Peter, Hatzopoulos, Z, Savvidis, Pavlos G, Baumberg, Jeremy J, Baumberg, Jeremy [0000-0002-9606-9488], and Apollo - University of Cambridge Repository

Subjects
Condensed Matter::Quantum Gases, Condensed Matter::Other, Physics::Optics, 0912 Materials Engineering
Abstract

Exciton polaritons in high quality semiconductor microcavities can travel long macroscopic distances (>100 μm) due to their ultralight effective mass. The polaritons are repelled from optically pumped exciton reservoirs where they are formed; however, their spatial dynamics is not as expected for pointlike particles. Instead we show polaritons emitted into waveguides travel orthogonally to the repulsive potential gradient and can only be explained if they are emitted as macroscopic delocalized quantum particles, even before they form Bose condensates.

Published
2019
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237. Plasmonic nanocavity modes: From near-field to far-field radiation

Author

Kongsuwan, Nuttawut, Demetriadou, Angela, Horton, Matthew, Chikkaraddy, Rohit, Baumberg, Jeremy J., and Hess, Ortwin

Subjects
Physics::Optics, FOS: Physical sciences, Physics - Optics, Optics (physics.optics)
Abstract

In the past decade, advances in nanotechnology have led to the development of plasmonic nanocavities which facilitate light-matter strong coupling in ambient conditions. The most robust example is the nanoparticle-on-mirror (NPoM) structure whose geometry is controlled with subnanometer precision. The excited plasmons in such nanocavities are extremely sensitive to the exact morphology of the nanocavity, giving rise to unexpected optical behaviors. So far, most theoretical and experimental studies on such nanocavities have been based solely on their scattering and absorption properties. However, these methods do not provide a complete optical description of a NPoM. Here, the NPoM is treated as an open non-conservative system supporting a set of photonic quasinormal modes (QNMs). By investigating the morphology-dependent optical properties of nanocavities, we propose a simple yet comprehensive nomenclature based on spherical harmonics and report spectrally overlapping bright and dark nanogap eigenmodes. The near-field and far-field optical properties of NPoMs are explored and reveal intricate multi-modal interactions.

Published
2019
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240. Applications in catalysis, photochemistry, and photodetection: general discussion

Author

Aizpurua, Javier, Baumberg, Jeremy J., Caps, Valerie, Cortes, Emiliano, Nijs, Bart de, Diaz Fernandez, Yuri, Fabris, Laura, Freakley, Simon, Gawinkowski, Sylwester, Glass, Daniel, Huang, Junyang, Jankiewicz, Bartlomiej, Khurgin, Jacob, Vijaya Kumar, Priyank, Maurer, Reinhard J., McBreen, Peter, Sven Mueller, Jeong, Niclas, Park, Y., Quiroz, Jhon, Rejman, Sebastian, Romero Gomez, Rosa Mayela, Salmon-Gamboa, Jorge, Schlücker, Sebastian, Schultz, Zachary, Shukla, Amaresh, Sivan, Yonatan, Thangamuthu, Madasamy, Torrente-Murciano, Laura, Xiao, Xiaofei, Xu,Hongxing, Zhan, Chao, Aizpurua, Javier, Baumberg, Jeremy J., Caps, Valerie, Cortes, Emiliano, Nijs, Bart de, Diaz Fernandez, Yuri, Fabris, Laura, Freakley, Simon, Gawinkowski, Sylwester, Glass, Daniel, Huang, Junyang, Jankiewicz, Bartlomiej, Khurgin, Jacob, Vijaya Kumar, Priyank, Maurer, Reinhard J., McBreen, Peter, Sven Mueller, Jeong, Niclas, Park, Y., Quiroz, Jhon, Rejman, Sebastian, Romero Gomez, Rosa Mayela, Salmon-Gamboa, Jorge, Schlücker, Sebastian, Schultz, Zachary, Shukla, Amaresh, Sivan, Yonatan, Thangamuthu, Madasamy, Torrente-Murciano, Laura, Xiao, Xiaofei, Xu,Hongxing, and Zhan, Chao

Published
2019

241. Present and Future of Surface-Enhanced Raman Scattering

Author

Química inorgánica, Kimika ez-organikoa, Langer, Judith, Jiménez de Aberasturi Arranz, Dorleta, Aizpurua Iriazabal, Francisco Javier, Alvarez Puebla, Ramon A., Auguie, Baptiste, Baumberg, Jeremy J., Bazan, Guillermo C., Bell, Steven E. J., Boisen, Anja, Brolo, Alexandre G., Choo, Jaebum, Cialla-May, Dana, Deckert, Volker, Fabris, Laura, Faulds, Karen, García de Abajo, F. Javier, Goodacre, Royston, Graham, Duncan, Haes, Amanda J., Haynes, Christy L., Huck, Christian, Itoh, Tamitake, Kall, Mikael, Kneipp, Janina, Kotov, Nicholas A., Kuang, Hua, Le Ru, Eric C., Lee, Hiang Kwee, Li, Jian-Feng, Ling, Xing Yi, Maier, Stefan A., Mayerhofer, Thomas, Moskovits, Martin, Murakoshi, Kei, Nam, Jwa-Min, Nie, Shuming, Ozaki, Yukihiro, Pastoriza Santos, Isabel, Perez Juste, Jorge, Popp, Juergen, Pucci, Annemarie, Reich, Stephanie, Ren, Bin, Schatz, George C., Shegai, Timur, Schlucker, Sebastian, Tay, Li-Lin, Thomas, K. George, Tian, Zhong-Qun, Van Duyne, Richard P., Vo-Dinh, Tuan, Wang, Yue, Willets, Katherine A., Xu, Chuanlai, Xu, Hongxing, Xu, Yikai, Yamamoto, Yuko S., Zhao, Bing, Liz Marzán, Luis Manuel, Química inorgánica, Kimika ez-organikoa, Langer, Judith, Jiménez de Aberasturi Arranz, Dorleta, Aizpurua Iriazabal, Francisco Javier, Alvarez Puebla, Ramon A., Auguie, Baptiste, Baumberg, Jeremy J., Bazan, Guillermo C., Bell, Steven E. J., Boisen, Anja, Brolo, Alexandre G., Choo, Jaebum, Cialla-May, Dana, Deckert, Volker, Fabris, Laura, Faulds, Karen, García de Abajo, F. Javier, Goodacre, Royston, Graham, Duncan, Haes, Amanda J., Haynes, Christy L., Huck, Christian, Itoh, Tamitake, Kall, Mikael, Kneipp, Janina, Kotov, Nicholas A., Kuang, Hua, Le Ru, Eric C., Lee, Hiang Kwee, Li, Jian-Feng, Ling, Xing Yi, Maier, Stefan A., Mayerhofer, Thomas, Moskovits, Martin, Murakoshi, Kei, Nam, Jwa-Min, Nie, Shuming, Ozaki, Yukihiro, Pastoriza Santos, Isabel, Perez Juste, Jorge, Popp, Juergen, Pucci, Annemarie, Reich, Stephanie, Ren, Bin, Schatz, George C., Shegai, Timur, Schlucker, Sebastian, Tay, Li-Lin, Thomas, K. George, Tian, Zhong-Qun, Van Duyne, Richard P., Vo-Dinh, Tuan, Wang, Yue, Willets, Katherine A., Xu, Chuanlai, Xu, Hongxing, Xu, Yikai, Yamamoto, Yuko S., Zhao, Bing, and Liz Marzán, Luis Manuel

Abstract

The discovery of the enhancement of Raman scattering by molecules adsorbed on nanostructured metal surfaces is a landmark in the history of spectroscopic and analytical techniques. Significant experimental and theoretical effort has been directed toward understanding the surface-enhanced Raman scattering (SERS) effect and demonstrating its potential in various types of ultrasensitive sensing applications in a wide variety of fields. In the 45 years since its discovery, SERS has blossomed into a rich area of research and technology, but additional efforts are still needed before it can be routinely used analytically and in commercial products. In this Review, prominent authors from around the world joined together to summarize the state of the art in understanding and using SERS and to predict what can be expected in the near future in terms of research, applications, and technological development. This Review is dedicated to SERS pioneer and our coauthor, the late Prof. Richard Van Duyne, whom we lost during the preparation of this article.

Published
2019

242. Theory of hot electrons: general discussion

Author

Aizpurua, Javier, Baletto, Francesca, Baumberg, Jeremy J., Christopher, Phillip, Nijs, Bart de, Deshpande, Preeti, Diaz Fernandez, Yuri, Fabris, Laura, Freakley, Simon, Gawinkowski, Sylwester, Govorov, Alexander, Halas, Naomi J., Hernandez, Romain, Jankiewicz, Bartlomiej, Khurgin, Jacob, Kuisma, Mikael, Kumar, Priyank Vijaya, Lischner, Johannes, Liu, Jie, Marini, Andrea, Maurer, Reinhard J., Mueller, Niclas Sven, Parente, Matteo, Park, Y., Reich, Stephanie, Sivan, Yonatan, Tagliabue, Giulia, Torrente-Murciano, Laura, Thangamuthu, Madasamy, Xiao, Xiaofei, Zayats, Anatoly, Aizpurua, Javier, Baletto, Francesca, Baumberg, Jeremy J., Christopher, Phillip, Nijs, Bart de, Deshpande, Preeti, Diaz Fernandez, Yuri, Fabris, Laura, Freakley, Simon, Gawinkowski, Sylwester, Govorov, Alexander, Halas, Naomi J., Hernandez, Romain, Jankiewicz, Bartlomiej, Khurgin, Jacob, Kuisma, Mikael, Kumar, Priyank Vijaya, Lischner, Johannes, Liu, Jie, Marini, Andrea, Maurer, Reinhard J., Mueller, Niclas Sven, Parente, Matteo, Park, Y., Reich, Stephanie, Sivan, Yonatan, Tagliabue, Giulia, Torrente-Murciano, Laura, Thangamuthu, Madasamy, Xiao, Xiaofei, and Zayats, Anatoly

Published
2019

243. Dynamics of hot electron generation in metallic nanostructures: general discussion

Author

Aizpurua, Javier, Ashfold, Matthew J., Baletto, Francesca, Baumberg, Jeremy J., Christopher, Phillip, Cortes, Emiliano, Nijs, Bart de, Diaz Fernandez, Yuri, Gargiulo, Julian, Gawinkowski, Sylwester, Halas, Naomi J., Hamans, Ruben, Jankiewicz, Bartlomiej, Khurgin, Jacob, Kumar, Priyank Vijaya, Maier, Stefan A., Maurer, Reinhard J., Mount, A., Mueller, Niclas Sven, Oulton, Rupert, Parente, Matteo, Park, Y., Quiroz, Jhon, Rejman, Sebastian, Schlücker, Sebastian, Schultz, Zachary, Sivan, Yonatan, Tagliabue, Giulia, Thangamuthu, Madasamy, Torrente-Murciano, Laura, Xiao, Xiaofei, Zayats, Anatoly, Zhan, Chao, Aizpurua, Javier, Ashfold, Matthew J., Baletto, Francesca, Baumberg, Jeremy J., Christopher, Phillip, Cortes, Emiliano, Nijs, Bart de, Diaz Fernandez, Yuri, Gargiulo, Julian, Gawinkowski, Sylwester, Halas, Naomi J., Hamans, Ruben, Jankiewicz, Bartlomiej, Khurgin, Jacob, Kumar, Priyank Vijaya, Maier, Stefan A., Maurer, Reinhard J., Mount, A., Mueller, Niclas Sven, Oulton, Rupert, Parente, Matteo, Park, Y., Quiroz, Jhon, Rejman, Sebastian, Schlücker, Sebastian, Schultz, Zachary, Sivan, Yonatan, Tagliabue, Giulia, Thangamuthu, Madasamy, Torrente-Murciano, Laura, Xiao, Xiaofei, Zayats, Anatoly, and Zhan, Chao

Published
2019

244. New materials for hot electron generation: general discussion

Author

Aizpurua, Javier, Baumberg, Jeremy J., Boltasseva, Alexandra, Christopher, Phillip, Cortes, Emiliano, Cronin, Stephen B., Dadhich, Bhavesh Kumar, Nijs, Bart de, Deshpande, Preeti, Diaz Fernandez, Yuri, Fabris, Laura, Gawinkowski, Sylwester, Govorov, Alexander, Halas, Naomi J., Huang, Junyang, Jankiewicz, Bartlomiej, Kamarudheen, Rifat, Khurgin, Jacob, Lee, Tae Kyung, Mahin, Julien, Marini, Andrea, Maurer, Reinhard J., Mueller, Niclas Sven, Park, Y., Rahaman, Mahfuju, Sühlücker, Sebastian, Schultz, Zachary, Sivan, Yonatan, Romero Gomez, Rosa Mayela, Salmon-Gamboa, Jorge, Schlücker, Sebastian, Tagliabue, Giulia, Thangamuthu, Madasamy, Xu, Hongxing, Zayats, Anatoly, Aizpurua, Javier, Baumberg, Jeremy J., Boltasseva, Alexandra, Christopher, Phillip, Cortes, Emiliano, Cronin, Stephen B., Dadhich, Bhavesh Kumar, Nijs, Bart de, Deshpande, Preeti, Diaz Fernandez, Yuri, Fabris, Laura, Gawinkowski, Sylwester, Govorov, Alexander, Halas, Naomi J., Huang, Junyang, Jankiewicz, Bartlomiej, Kamarudheen, Rifat, Khurgin, Jacob, Lee, Tae Kyung, Mahin, Julien, Marini, Andrea, Maurer, Reinhard J., Mueller, Niclas Sven, Park, Y., Rahaman, Mahfuju, Sühlücker, Sebastian, Schultz, Zachary, Sivan, Yonatan, Romero Gomez, Rosa Mayela, Salmon-Gamboa, Jorge, Schlücker, Sebastian, Tagliabue, Giulia, Thangamuthu, Madasamy, Xu, Hongxing, and Zayats, Anatoly

Published
2019

245. Extreme nanophotonics from ultrathin metallic gaps

Author

Engineering and Physical Sciences Research Council (UK), Ministerio de Economía y Competitividad (España), Air Force Office of Scientific Research (US), National Science Foundation (US), Baumberg, J. J. [0000-0002-9606-9488], Mikkelsen, M. H. [0000-0002-0487-7585], Baumberg, Jeremy J., Aizpurua, Javier, Mikkelsen, M. H., Smith, D. R., Engineering and Physical Sciences Research Council (UK), Ministerio de Economía y Competitividad (España), Air Force Office of Scientific Research (US), National Science Foundation (US), Baumberg, J. J. [0000-0002-9606-9488], Mikkelsen, M. H. [0000-0002-0487-7585], Baumberg, Jeremy J., Aizpurua, Javier, Mikkelsen, M. H., and Smith, D. R.

Abstract

Ultrathin dielectric gaps between metals can trap plasmonic optical modes with surprisingly low loss and with volumes below 1 nm3. We review the origin and subtle properties of these modes, and show how they can be well accounted for by simple models. Particularly important is the mixing between radiating antennas and confined nanogap modes, which is extremely sensitive to precise nanogeometry, right down to the single-atom level. Coupling nanogap plasmons to electronic and vibronic transitions yields a host of phenomena including single-molecule strong coupling and molecular optomechanics, opening access to atomic-scale chemistry and materials science, as well as quantum metamaterials. Ultimate low-energy devices such as robust bottom-up assembled single-atom switches are thus in prospect.

Published
2019

247. In situ observations of phase transitions in metastable nickel (carbide)/carbon nanocomposites

Author

Bayer, Bernhard C, Bosworth, David A, Michaelis, F Benjamin, Blume, Raoul, Habler, Gerlinde, Abart, Rainer, Weatherup, Robert S, Kidambi, Piran R, Baumberg, Jeremy J, Knop-Gericke, Axel, Schloegl, Robert, Baehtz, Carsten, Barber, Zoe H, Meyer, Jannik C, Hofmann, Stephan, Weatherup, Robert [0000-0002-3993-9045], Baumberg, Jeremy [0000-0002-9606-9488], Hofmann, Stephan [0000-0001-6375-1459], and Apollo - University of Cambridge Repository

Subjects
nickel carbide, carbon nano tubes, Large scale facilities for research with photons neutrons and ions, in-situ xray diffraction, 0912 Materials Engineering, Article
Abstract

Nanocomposite thin films comprised of metastable metal-carbides in a carbon matrix have a wide variety of applications ranging from hard coatings to magnetics and energy storage and conversion. While their deposition using non-equilibrium techniques is established, the understanding of the dynamic evolution of such metastable nanocomposites under thermal equilibrium conditions at elevated temperatures during processing and during device operation remains limited. Here, we investigate sputter deposited nanocomposites of metastable Ni carbide (Ni3C) nanocrystals in an amorphous carbon (a-C) matrix during thermal post-deposition processing via complementary in-situ X-ray diffractometry, in-situ Raman spectroscopy and in-situ X-ray photoelectron spectroscopy. At low annealing temperatures (300 °C) we observe isothermal Ni3C decomposition into face-centered-cubic Ni and amorphous carbon, however, without changes to the initial finely structured nanocomposite morphology. Only for higher temperatures (400-800 °C) Ni-catalyzed isothermal graphitization of the amorphous carbon matrix sets in, which we link to bulk-diffusion-mediated phase separation of the nanocomposite into coarser Ni and graphite grains. Upon natural cooling, only minimal precipitation of additional carbon from the Ni is observed, showing that even for highly carbon saturated systems precipitation upon cooling can be kinetically quenched. Our findings demonstrate that phase transformations of the filler and morphology modifications of the nanocomposite can be decoupled which is advantageous from a manufacturing perspective. Our in-situ study also identifies the high carbon content of the Ni filler crystallites at all stages of processing as the key hallmark feature of such metal-carbon nanocomposites that governs their entire thermal evolution. In a wider context, we also discuss our findings with regard to the much debated potential role of metastable Ni3C as a catalyst phase in graphene and carbon nanotube growth.

Published
2016

248. Reality science

Author

Baumberg, Jeremy J, Baumberg, Jeremy [0000-0002-9606-9488], and Apollo - University of Cambridge Repository

Subjects
49 Mathematical Sciences, General Physics and Astronomy, 51 Physical Sciences
Abstract

Another panel reviewing grants. Hours of argument when, with the funding available, only the top-rated one will get funded. I sigh. Surely there might be other ways...

Published
2018

249. Inhibiting Analyte Theft in Surface-Enhanced Raman Spectroscopy Substrates: Subnanomolar Quantitative Drug Detection

Author

de Nijs, Bart, primary, Carnegie, Cloudy, additional, Szabó, István, additional, Grys, David-Benjamin, additional, Chikkaraddy, Rohit, additional, Kamp, Marlous, additional, Barrow, Steven J., additional, Readman, Charlie A., additional, Kleemann, Marie-Elena, additional, Scherman, Oren A., additional, Rosta, Edina, additional, and Baumberg, Jeremy J., additional

Published
2019
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